Publications by authors named "Yoshio Bando"

364 Publications

Atomic-scale regulation of anionic and cationic migration in alkali metal batteries.

Nat Commun 2021 Jul 7;12(1):4184. Epub 2021 Jul 7.

Centre for Clean Energy Technology, School of Mathematical and Physical Sciences, Faculty of Science, University of Technology Sydney, Broadway, Sydney, NSW 2007, Australia.

The regulation of anions and cations at the atomic scale is of great significance in membrane-based separation technologies. Ionic transport regulation techniques could also play a crucial role in developing high-performance alkali metal batteries such as alkali metal-sulfur and alkali metal-selenium batteries, which suffer from the non-uniform transport of alkali metal ions (e.g., Li or Na) and detrimental shuttling effect of polysulfide/polyselenide anions. These drawbacks could cause unfavourable growth of alkali metal depositions at the metal electrode and irreversible consumption of cathode active materials, leading to capacity decay and short cycling life. Herein, we propose the use of a polypropylene separator coated with negatively charged TiO nanosheets with Ti atomic vacancies to tackle these issues. In particular, we demonstrate that the electrostatic interactions between the negatively charged TiO nanosheets and polysulfide/polyselenide anions reduce the shuttling effect. Moreover, the TiO-coated separator regulates the migration of alkali ions ensuring a homogeneous ion flux and the Ti vacancies, acting as sub-nanometric pores, promote fast alkali-ion diffusion.
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http://dx.doi.org/10.1038/s41467-021-24399-9DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8263716PMC
July 2021

Highly ordered macroporous dual-element-doped carbon from metal-organic frameworks for catalyzing oxygen reduction.

Chem Sci 2020 Aug 11;11(35):9584-9592. Epub 2020 Aug 11.

School of Chemistry and Molecular Engineering, Shanghai Key Laboratory of Green Chemistry and Chemical Processes, East China Normal University Shanghai 200062 China.

Multiple heteroatom-doped carbons with 3D ordered macro/meso-microporous structures have not been realized by simple carbonization of metal-organic frameworks (MOFs). Herein, ordered macroporous phosphorus- and nitrogen-doped carbon (M-PNC) is prepared successfully by carbonization of double-solvent-induced MOF/polystyrene sphere (PS) precursors accompanied with spontaneous removal of the PS template, followed by post-doping. M-PNC shows a high specific surface area of 837 m g, nitrogen doping of 3.17 at%, and phosphorus doping of 1.12 at%. Thanks to the hierarchical structure, high specific surface area, and multiple heteroatom-doping, M-PNC exhibits unusual catalytic activity as an electrocatalyst for the oxygen reduction reaction. Computational calculation reveals that the P[double bond, length as m-dash]O group helps stabilize the adsorption of intermediates, and the position of P[double bond, length as m-dash]O relative to graphitic N significantly improves the activity of the adjacent carbons for electrocatalysis.
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http://dx.doi.org/10.1039/d0sc02518fDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8162149PMC
August 2020

Ti Tuning the Ratio of Cu /Cu in the Ultrafine Cu Nanoparticles for Boosting the Hydrogenation Reaction.

Small 2021 Jun 22;17(23):e2008052. Epub 2021 Apr 22.

Tianjin Key Laboratory of Applied Catalysis Science and Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China.

Hydrogenation of diesters to diols is a vital process for chemical industry. The inexpensive Cu /Cu -based catalysts are highly active for the hydrogenation of esters, however, how to efficiently tune the ratio of Cu /Cu and stabilize the Cu is a great challenge. In this work, it is demonstrated that doped Ti ions can tune the ratio of Cu /Cu and stabilize the Cu by the TiOCu bonds in Ti-doped SiO supported Cu nanoparticle (Cu/Ti-SiO ) catalysts for the high conversion of dimethyl adipate to 1,6-hexanediol. In the synthesis of the catalysts, the Ti OCu bonds promote the reduction of Cu to Cu by forming Ti O Cu (O : oxygen vacancy) bonds and the amount of Ti doping can tune the ratio of Cu /Cu . In the catalytic reaction, the O vacancy activates CO in the ester by forming new Ti O Cu bonds (O : reactant oxygen), and Cu activates hydrogen. After the products are desorbed, the Ti O Cu bonds return to the initial state of Ti O Cu bonds. The reversible TiOCu bonds greatly improve the activity and stability of the Cu/Ti-SiO catalysts. When the content of Ti is controlled at 0.4 wt%, the conversion and selectivity can reach 100% and 98.8%, respectively, and remain stable for 260 h without performance degradation.
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http://dx.doi.org/10.1002/smll.202008052DOI Listing
June 2021

In Search of Excellence: Convex versus Concave Noble Metal Nanostructures for Electrocatalytic Applications.

Adv Mater 2021 Apr 22;33(13):e2004554. Epub 2021 Feb 22.

JST-ERATO Yamauchi Materials Space-Tectonics Project, International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki, 305-0044, Japan.

Controlling the shape of noble metal nanoparticles is a challenging but important task in electrocatalysis. Apart from hollow and nanocage structures, concave noble metal nanoparticles are considered a new class of unconventional electrocatalysts that exhibit superior electrocatalytic properties as compared with those of conventional nanoparticles (including convex and flat ones). Herein, several facile and highly reproducible routes for synthesizing nanostructured concave noble metal materials reported in the literature are discussed, together with their advantages over noble metal nanoparticles with convex shapes. In addition, possible ways of optimizing the synthesis procedure and enhancing the electrocatalytic characteristics of concave metal nanoparticles are suggested. Nanostructured noble metals with concave features are found to show better catalytic activity and stability hence improve their practical applicability in electrocatalysis.
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http://dx.doi.org/10.1002/adma.202004554DOI Listing
April 2021

Stable single atomic silver wires assembling into a circuitry-connectable nanoarray.

Nat Commun 2021 Feb 19;12(1):1191. Epub 2021 Feb 19.

Department of Environmental Science and Engineering, Fudan University, Shanghai, China.

Atomic metal wires have great promise for practical applications in devices due to their unique electronic properties. Unfortunately, such atomic wires are extremely unstable. Here we fabricate stable atomic silver wires (ASWs) with appreciably unoccupied states inside the parallel tunnels of α-MnO nanorods. These unoccupied Ag 4d orbitals strengthen the Ag-Ag bonds, greatly enhancing the stability of ASWs while the presence of delocalized 5s electrons makes the ASWs conducting. These stable ASWs form a coherently oriented three-dimensional wire array of over 10 nm in width and up to 1 μm in length allowing us to connect it to nano-electrodes. Current-voltage characteristics of ASWs show a temperature-dependent insulator-to-metal transition, suggesting that the atomic wires could be used as thermal electrical devices.
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http://dx.doi.org/10.1038/s41467-021-21462-3DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7895918PMC
February 2021

Tunable Concave Surface Features of Mesoporous Palladium Nanocrystals Prepared from Supramolecular Micellar Templates.

ACS Appl Mater Interfaces 2020 Nov 4;12(46):51357-51365. Epub 2020 Nov 4.

School of Chemical Engineering and Australian Institute for Bioengineering and Nanotechnology (AIBN), The University of Queensland, Brisbane, QLD 4072, Australia.

Concave metallic nanocrystals with a high density of low-coordinated atoms on the surface are essential for the realization of unique catalytic properties. Herein, mesoporous palladium nanocrystals (MPNs) that possess various degrees of curvature are successfully synthesized following an approach that relies on a facile polymeric micelle assembly approach. The as-prepared MPNs exhibit larger surface areas compared to conventional Pd nanocrystals and their nonporous counterparts. The MPNs display enhanced electrocatalytic activity for ethanol oxidation when compared to state-of-the-art commercial palladium black and conventional palladium nanocubes used as catalysts. Interestingly, as the degree of curvature increases, the surface-area-normalized activity also increases, demonstrating that the curvature of MPNs and the presence of high-index facets are crucial considerations for the design of electrocatalysts.
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http://dx.doi.org/10.1021/acsami.0c13136DOI Listing
November 2020

A universal approach for the synthesis of mesoporous gold, palladium and platinum films for applications in electrocatalysis.

Nat Protoc 2020 09 24;15(9):2980-3008. Epub 2020 Aug 24.

Australian Institute for Bioengineering and Nanotechnology (AIBN), The University of Queensland, Brisbane, Australia.

High-surface-area mesoporous materials expose abundant functional sites for improved performance in applications such as gas storage/separation, catalysis, and sensing. Recently, soft templates composed of amphiphilic surfactants and block copolymers have been used to introduce mesoporosity in various materials, including metals, metal oxides and carbonaceous compounds. In particular, mesoporous metals are attractive in electrocatalysis because their porous networks expose numerous unsaturated atoms on high-index facets that are highly active in catalysis. In this protocol, we describe how to create mesoporous metal films composed of gold, palladium, or platinum using block copolymer micelle templates. The amphiphilic block copolymer micelles are the sacrificial templates and generate uniform structures with tunable pore sizes in electrodeposited metal films. The procedure describes the electrodeposition in detail, including parameters such as micelle diameters, deposition potentials, and deposition times to ensure reproducibility. The micelle diameters can be controlled by swelling the micelles with different solvent mixtures or by using block copolymer micelles with different molecular weights. The deposition potentials and deposition times allow further control of the mesoporous structure and its thickness, respectively. Procedures for example applications are included: glucose oxidation, ethanol oxidation and methanol oxidation reactions. The synthetic methods for preparation of mesoporous metal films will take ~4 h; the subsequent electrochemical tests will take ~5 h for glucose sensing and ~3 h for alcohol oxidation reaction.
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http://dx.doi.org/10.1038/s41596-020-0359-8DOI Listing
September 2020

Strain engineering of two-dimensional multilayered heterostructures for beyond-lithium-based rechargeable batteries.

Nat Commun 2020 Jul 3;11(1):3297. Epub 2020 Jul 3.

Centre for Clean Energy Technology, School of Mathematical and Physical Sciences, University of Technology, Sydney, NSW, 2007, Australia.

Beyond-lithium-ion batteries are promising candidates for high-energy-density, low-cost and large-scale energy storage applications. However, the main challenge lies in the development of suitable electrode materials. Here, we demonstrate a new type of zero-strain cathode for reversible intercalation of beyond-Li ions (Na, K, Zn, Al) through interface strain engineering of a 2D multilayered VOPO-graphene heterostructure. In-situ characterization and theoretical calculations reveal a reversible intercalation mechanism of cations in the 2D multilayered heterostructure with a negligible volume change. When applied as cathodes in K-ion batteries, we achieve a high specific capacity of 160 mA h g and a large energy density of ~570 W h kg, presenting the best reported performance to date. Moreover, the as-prepared 2D multilayered heterostructure can also be extended as cathodes for high-performance Na, Zn, and Al-ion batteries. This work heralds a promising strategy to utilize strain engineering of 2D materials for advanced energy storage applications.
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http://dx.doi.org/10.1038/s41467-020-17014-wDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7335097PMC
July 2020

Layered transition metal dichalcogenide/carbon nanocomposites for electrochemical energy storage and conversion applications.

Nanoscale 2020 Apr;12(16):8608-8625

Key Laboratory of Eco-chemical Engineering, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, China.

Layered transition metal dichalcogenide (LTMD)/carbon nanocomposites obtained by incorporating conductive carbons such as graphene, carbon nanotubes (CNT), carbon nanofibers (CF), hybrid carbons, hollow carbons, and porous carbons exhibit superior electrochemical properties for energy storage and conversion. Due to the incorporation of carbon into composites, the LTMD/carbon nanocomposites have the following advantages: (1) highly efficient ion/electron transport properties that promote electrochemical performance; (2) suppressed agglomeration and restacking of active materials that improve the cycling performance and electrocatalytic stability; and (3) unique structures such as network, hollow, porous, and vertically aligned nanocomposites that facilitate the shortening of the ion and electrolyte diffusion pathway. In this context, this review introduces and summarizes the recent advances in LTMD/carbon nanocomposites for electrochemical energy-related applications. First, we briefly summarize the reported synthesis strategies for the preparation of LTMD/carbon nanocomposites with various carbon materials. Following this, previous studies using rationally synthesized nanocomposites are discussed based on a variety of applications related to electrochemical energy storage and conversion including Li/Na-ion batteries (LIBs/SIBs), Li-S batteries, supercapacitors, and the hydrogen evolution reaction (HER). In particular, the sections on LIBs and the HER as representative applications of LTMD/carbon nanocomposites are described in detail by classifying them with different carbon materials containing graphene, carbon nanotubes, carbon nanofibers, hybrid carbons, hollow carbons, and porous carbons. In addition, we suggest a new material design of LTMD/carbon nanocomposites based on theoretical calculations. At the end of this review, we provide an outlook on the challenges and future developments in LTMD/carbon nanocomposite research.
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http://dx.doi.org/10.1039/d0nr01664kDOI Listing
April 2020

Spherical Superstructure of Boron Nitride Nanosheets Derived from Boron-Containing Metal-Organic Frameworks.

J Am Chem Soc 2020 May 28;142(19):8755-8762. Epub 2020 Apr 28.

Australian Institute for Bioengineering and Nanotechnology (AIBN), The University of Queensland, Brisbane, Queensland 4072, Australia.

The assembly of two-dimensional (2D) nanosheets into three-dimensional (3D) well-organized superstructures is one of the key topics in materials chemistry and physics, due to their potential applications in various fields. Herein, starting from the crystalline metal-organic framework (MOF) particles, a spherical superstructure consisting of metal-organic framework nanosheets (SS-MOFNSs) is synthesized via a simple solvothermal transformation process. After pyrolysis and nitrogenization in ammonia, the SS-MOFNSs are further transformed into the spherical superstructure consisting of boron nitride nanosheets (SS-BNNSs), which preserve the original spherical superstructure morphology. Taking advantage of this unique superstructure, the resulting SS-BNNSs exhibit excellent catalytic activity for selective oxidative dehydrogenation of propane to produce propylene and ethylene. The results of this work provide a novel synthetic strategy to fabricate 3D spherical superstructures consisting of 2D nanosheets for high-performance applications in catalysis, energy storage, as well as other related fields.
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http://dx.doi.org/10.1021/jacs.0c01023DOI Listing
May 2020

Mesoporous Iron-doped MoS/CoMoS Heterostructures through Organic-Metal Cooperative Interactions on Spherical Micelles for Electrochemical Water Splitting.

ACS Nano 2020 Apr 2;14(4):4141-4152. Epub 2020 Apr 2.

School of Chemical Engineering and Australian Institute for Bioengineering and Nanotechnology, University of Queensland, Brisbane 4072, QLD, Australia.

Mesoporous metal sulfide hybrid (meso-MoS/CoMoS) materials via a soft-templating approach using diblock copolymer polystyrene--poly(acrylic acid) micelles are reported. The formation of the meso-MoS/CoMoS heterostructures is based on the sophisticated coassembly of dithiooxamide and metal precursors (, Co, PMo), which are subsequently annealed in nitrogen atmosphere to generate the mesoporous material. Decomposing the polymer leaves behind mesopores throughout the spherical MoS/CoMoS hybrid particles, generating numerous electrochemical active sites in a network of pores that enable faster charge transfer and mass/gas diffusion that enhance the electrocatalytic performance of MoS/CoMoS. Doping the spherical meso-MoS/CoMoS heterostructures with iron improves the electronic properties of the hybrid meso-Fe-MoS/CoMoS material and consequently results in its superior electrochemical activities for both hydrogen evolution reaction and oxygen evolution reaction.
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http://dx.doi.org/10.1021/acsnano.9b08904DOI Listing
April 2020

Sandwich-Structured Ordered Mesoporous Polydopamine/MXene Hybrids as High-Performance Anodes for Lithium-Ion Batteries.

ACS Appl Mater Interfaces 2020 Apr 18;12(13):14993-15001. Epub 2020 Mar 18.

School of Chemical Engineering and Australian Institute for Bioengineering and Nanotechnology (AIBN), The University of Queensland, Brisbane, Queensland 4072, Australia.

Organic polymers have attracted significant interest as electrodes for energy storage devices because of their advantages, including molecular flexibility, cost-effectiveness, and environmentally friendly nature. Nevertheless, the real implementation of polymer-based electrodes is restricted by their poor stability, low capacity, and slow electron-transfer/ion diffusion kinetics. In this work, a sandwich-structured composite of ordered mesoporous polydopamine (OMPDA)/TiCT has been fabricated by in situ polymerization of dopamine on the surface of TiCT via employing the PS--PEO block polymer as a soft template. The OMPDA layers with vertically oriented, accessible nanopores (∼20 nm) provide a continuous pore channel for ion diffusion, while the TiCT layers guarantee a fast electron-transfer path. The OMPDA/TiCT composite anode exhibits high reversible capacity, good rate performance, and excellent cyclability for lithium-ion batteries. The in situ transmission electron microscopy analysis reveals that the OMPDA in the composite only shows a small volume expansion and almost preserves the initial morphology during lithiation. Moreover, these in situ experiments also demonstrate the generation of a stable and ultrathin solid electrolyte interphase layer surrounding the active material, which acts as an electrode protective film during cycling. This study demonstrates the method to develop polymer-based electrodes for high-performance rechargeable batteries.
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http://dx.doi.org/10.1021/acsami.9b18883DOI Listing
April 2020

Porous Monolithic Electrode of Ni₃FeN on 3D Graphene for Efficient Oxygen Evolution.

J Nanosci Nanotechnol 2020 Aug;20(8):5175-5181

Collaborative Innovation Center of Advanced Microstructures, National Laboratory of Solid State Microstructures (LSSSM), Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China.

Developing high-performance nonprecious electrocatalysts for oxygen evolution reaction (OER) is of great importance, but it remains a challenge. In this paper, we synthesize a porous monolithic catalytic electrode, which is transition metal nitride, Ni₃FeN, constructed on a 3D network-like support of the strutted graphene foam (Ni₃FeN/SG). The obtained Ni₃FeN/SG electrode shows the excellent catalytic activity and the durability for OER in alkaline solution, owing to iron incorporation, high electrical conductivity and 3D network-like structure of strutted graphene. It requires small overpotential (226 mV) to actuate 10 mA cm, superior to most recently developed catalysts and commercial RuO₂. The fabrication strategy provides a substantial way to expand 3D porous monolithic electrodes for various electrocatalytic applications.
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http://dx.doi.org/10.1166/jnn.2020.18535DOI Listing
August 2020

Mesoporous Metal-Metalloid Amorphous Alloys: The First Synthesis of Open 3D Mesoporous Ni-B Amorphous Alloy Spheres via a Dual Chemical Reduction Method.

Small 2020 Mar 5;16(10):e1906707. Epub 2020 Feb 5.

International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki, 305-0044, Japan.

Selective hydrogenation of nitriles is an industrially relevant synthetic route for the preparation of primary amines. Amorphous metal-boron alloys have a tunable, glass-like structure that generates a high concentration of unsaturated metal surface atoms that serve as active sites in hydrogenation reactions. Here, a method to create nanoparticles composed of mesoporous 3D networks of amorphous nickel-boron (Ni-B) alloy is reported. The hydrogenation of benzyl cyanide to β-phenylethylamine is used as a model reaction to assess catalytic performance. The mesoporous Ni-B alloy spheres have a turnover frequency value of 11.6 h , which outperforms non-porous Ni-B spheres with the same composition. The bottom-up synthesis of mesoporous transition metal-metalloid alloys expands the possible reactions that these metal architectures can perform while simultaneously incorporating more Earth-abundant catalysts.
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http://dx.doi.org/10.1002/smll.201906707DOI Listing
March 2020

Localization of ATP-sensitive K channel subunits in rat liver.

World J Exp Med 2019 Dec 19;9(2):14-31. Epub 2019 Dec 19.

Department of Anatomy, Akita University Graduate School of Medicine, Akita 010-8543, Japan.

Background: ATP-sensitive K (K) channels were originally found in cardiac myocytes by Noma in 1983. K channels were formed by potassium ion-passing pore-forming subunits (Kir6.1, Kir6.2) and regulatory subunits SUR1, SU2A and SUR2B. A number of cells and tissues have been revealed to contain these channels including hepatocytes, but detailed localization of these subunits in different types of liver cells was still uncertain.

Aim: To investigate the expression of K channel subunits in rat liver and their localization in different cells of the liver.

Methods: Rabbit anti-rat SUR1 peptide antibody was raised and purified by antigen immunoaffinity column chromatography. Four of Sprague-Dawley rats were used for liver protein extraction for immunoblot analysis, seven of them were used for immunohistochemistry both for the ABC method and immunofluorescence staining. Four of Wistar rats were used for the isolation of hepatic stellate cells (HSCs) and Kupffer cells for both primary culture and immunocytochemistry.

Results: Immunoblot analysis showed that the five kinds of K channel subunits, . Kir6.1, Kir6.2, SUR1, SUR2A, and SUR2B, were detected in liver. Immunohistochemical staining showed that Kir6.1 and Kir6.2 were weakly to moderately expressed in parenchymal cells and sinusoidal lining cells, while SUR1, SUR2A, and SUR2B were mainly localized to sinusoidal lining cells, such as HSCs, Kupffer cells, and sinusoidal endothelial cells. Immunoreactivity for SUR2A and SUR2B was expressed in the hepatocyte membrane. Double immunofluorescence staining further showed that the pore-forming subunits Kir6.1 and/or Kir6.2 colocalized with GFAP in rat liver sections and primary cultured HSCs. These K channel subunits also colocalized with CD68 in liver sections and primary cultured Kupffer cells. The SUR subunits colocalized with GFAP in liver sections and colocalized with CD68 both in liver sections and primary cultured Kupffer cells. In addition, five K channel subunits colocalized with SE-1 in sinusoidal endothelial cells.

Conclusion: Observations from the present study indicated that K channel subunits expressed in rat liver and the diversity of K channel subunit composition might form different types of K channels. This is applicable to hepatocytes, HSCs, various types of Kupffer cells and sinusoidal endothelial cells.
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http://dx.doi.org/10.5493/wjem.v9.i2.14DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6955576PMC
December 2019

An anomalous case of the flexor carpi radialis with an excessive muscular bundle.

Anat Sci Int 2020 Mar 17;95(2):293-296. Epub 2019 Dec 17.

Department of Anatomy, Akita University Graduate School of Medicine, 1-1-1 Hondo, Akita, 010-8543, Japan.

A variation of the flexor carpi radialis with an excessive muscular bundle was found on the right forearm of a Japanese male cadaver. The flexor carpi radialis had two heads, medial one arising from the medial epicondyle of the humerus, and the other, a variant excessive muscular bundle, arising from the bicipital aponeurosis deep at the medial edge of the tendon of biceps brachii. There was also a muscular slip between the pronator teres and lateral head of flexor carpi radialis. The insertion of the ending tendon of the flexor carpi radialis was also variant, which was not only inserted into the base of the second metacarpal bone, but into the proximal surface of the scaphoid and the tubercle of trapezium. The excessive muscular bundle might be a residual muscular slip which connects between the distal part of the biceps brachii and the initial part of the flexor carpi radialis during the early embryonic development.
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http://dx.doi.org/10.1007/s12565-019-00519-wDOI Listing
March 2020

Large-Scale Synthesis of MOF-Derived Superporous Carbon Aerogels with Extraordinary Adsorption Capacity for Organic Solvents.

Angew Chem Int Ed Engl 2020 Jan 17;59(5):2066-2070. Epub 2019 Dec 17.

Key Laboratory of Eco-chemical Engineering, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao, 266042, China.

Carbon aerogels (CAs) with 3D interconnected networks hold promise for application in areas such as pollutant treatment, energy storage, and electrocatalysis. In spite of this, it remains challenging to synthesize high-performance CAs on a large scale in a simple and sustainable manner. We report an eco-friendly method for the scalable synthesis of ultralight and superporous CAs by using cheap and widely available agarose (AG) biomass as the carbon precursor. Zeolitic imidazolate framework-8 (ZIF-8) with high porosity is introduced into the AG aerogels to increase the specific surface area and enable heteroatom doping. After pyrolysis under inert atmosphere, the ZIF-8/AG-derived nitrogen-doped CAs show a highly interconnected porous mazelike structure with a low density of 24 mg cm , a high specific surface area of 516 m  g , and a large pore volume of 0.58 cm  g . The resulting CAs exhibit significant potential for application in the adsorption of organic pollutants.
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http://dx.doi.org/10.1002/anie.201913719DOI Listing
January 2020

Roads to Formation of Normal Myelin Structure and Pathological Myelin Structure.

Authors:
Yoshio Bando

Adv Exp Med Biol 2019 ;1190:257-264

Department of Functional Anatomy and Neuroscience, Asahikawa Medical University, Asahikawa, Japan.

Demyelination and axonal damage are responsible for neurological deficits in demyelinating diseases including multiple sclerosis (MS), an inflammatory demyelinating disease of the central nervous system. However, the pathology of demyelination and axonal damage in MS is not fully understood. While immunologists have accumulated evidence, which is involved in many immunological events in these diseases, neuroscientists and anatomists have also investigated morphological changes of myelin in these diseases. In this chapter, a new concept of demyelination will be described.
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http://dx.doi.org/10.1007/978-981-32-9636-7_16DOI Listing
December 2019

Superparamagnetic nanoarchitectures for disease-specific biomarker detection.

Chem Soc Rev 2019 Dec;48(24):5717-5751

Australian Institute for Bioengineering and Nanotechnology (AIBN), The University of Queensland, Brisbane, QLD 4072, Australia.

The detection of clinically relevant disease-specific biomolecules, including nucleic acids, circulating tumor cells, proteins, antibodies, and extracellular vesicles, has been indispensable to understand their functions in disease diagnosis and prognosis. Therefore, a biosensor for the robust, ultrasensitive, and selective detection of these low-abundant biomolecules in body fluids (blood, urine, and saliva) is emerging in current clinical research. In recent years, nanomaterials, especially superparamagnetic nanomaterials, have played essential roles in biosensing due to their intrinsic magnetic, electrochemical, and optical properties. However, engineered multicomponent magnetic nanoparticle-based current biosensors that offer the advantages of excellent stability in a complex biomatrix; easy and alterable biorecognition of ligands, antibodies, and receptor molecules; and unified point-of-care integration have yet to be achieved. This review introduces the recent advances in superparamagnetic nanostructures for electrochemical and optical biosensing for disease-specific biomarkers. This review emphasizes the synthesis, biofunctionalization, and intrinsic properties of nanomaterials essential for robust, ultrasensitive biosensing. With a particular emphasis on nanostructure-based electrochemical and optical detection of disease-specific biomarkers such as nucleic acids (DNA and RNA), proteins, autoantibodies, and cells, this review also chronicles the needs and challenges of nanoarchitecture-based detection. These summaries provide further insights for researchers to inspire their future work on the development of nanostructures for integrating into biosensing and devices for a broad field of applications in analytical sensing and in clinic.
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http://dx.doi.org/10.1039/c9cs00174cDOI Listing
December 2019

Dataset on the effect of knockout of KLK8 in social memory.

Data Brief 2019 Oct 30;26:104458. Epub 2019 Aug 30.

Emeritus Professor of Graduate School of Biological Science, Nara Institute of Science and Technology (NAIST), Ikoma, Nara, 630-0192, Japan.

The data presented in this article have been produced as supporting data of the original research article titled "Impaired social discrimination behavior despite normal social approach by kallikrein-related peptidase 8 knockout mouse" (Nakazawa et al., 2019). Sociability and recognition of conspecifics and discrimination among conspecifics (social memory) is fundamental for pair bonding, to create social hierarchy, and eventually establish affiliated societies in social animals, including humans. It has been speculated that the processes of cognition, attention and memory, which are largely mediated by the hippocampus, contribute to social behavior. However, the molecular basis of social behavior remains elusive. This article presents a dataset of behavior-related KLK8-NRG1-ErbB signaling changes in the hippocampus and the effect of activation of ErbB signaling on social behavior.
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http://dx.doi.org/10.1016/j.dib.2019.104458DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6811932PMC
October 2019

Designed Patterning of Mesoporous Metal Films Based on Electrochemical Micelle Assembly Combined with Lithographical Techniques.

Small 2020 03 11;16(12):e1902934. Epub 2019 Oct 11.

Australian Institute for Bioengineering and Nanotechnology (AIBN), and School of Chemical Engineering, The University of Queensland, Brisbane, QLD, 4072, Australia.

Mesoporous noble metals and their patterning techniques for obtaining unique patterned structures are highly attractive for electrocatalysis, photocatalysis, and optoelectronics device applications owing to their expedient properties such as high level of exposed active locations, cascade electrocatalytic sites, and large surface area. However, patterning techniques for mesoporous substrates are still limited to metal oxide and silica films, although there is growing demand for developing techniques related to patterning mesoporous metals. In this study, the first demonstration of mesoporous metal films on patterned gold (Au) substrates, prefabricated using photolithographic techniques, is reported. First, different growth rates of mesoporous Au metal films on patterned Au substrates are demonstrated by varying deposition times and voltages. In addition, mesoporous Au films are also fabricated on various patterns of Au substrates including stripe and mesh lines. An alternative fabrication method using a photoresist insulating mask also yields growth of mesoporous Au within the patterning. Moreover, patterned mesoporous films of palladium (Pd) and palladium-copper alloy (PdCu) are demonstrated on the same types of substrates to show versatility of this method. Patterned mesoporous Au films (PMGFs) show higher electrochemically active surface area (ECSA) and higher sensitivity toward glucose oxidation than nonpatterned mesoporous Au films (NMGF).
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http://dx.doi.org/10.1002/smll.201902934DOI Listing
March 2020

Disease modifying mitochondrial uncouplers, MP101, and a slow release ProDrug, MP201, in models of Multiple Sclerosis.

Neurochem Int 2019 12 1;131:104561. Epub 2019 Oct 1.

Mitochon Pharmaceuticals, Inc., 970 Cross Lane, Blue Bell, PA, 19422, USA.

Mitochondrial dysfunction is thought to be involved in the pathogenesis of MS and here we tested if brain penetrant mitochondrial uncouplers, DNP (MP101) and a novel prodrug of DNP (MP201), have the pharmacology to suppress demyelination and axonal loss in two independent models of MS by modulating the entire organelle's physiology. First, the gold standard EAE mouse model for MS was evaluated by daily oral treatment Day 7-21 with either MP101 or MP201 post-immunization. Both MP101/MP201 significantly suppressed progression of paralysis with limited infiltration of inflammatory cells. Strikingly, although mitochondrial uncouplers do increase energy expenditure even at the low doses provided here, they paradoxically preserved body weight at all doses in comparison to wasting in advanced paralysis of the placebos. Second, the effects of the compounds on suppressing inflammation were also evaluated in the cuprizone model, independent of the immune system. MP101/MP201 had a striking effect preserving both myelination and protecting the axons, in comparison to the placebos where both were destroyed. Both MP101/MP201 induced a significant and sustained increase in neurotrophin, BDNF, in the spinal cords. Both MP101/MP201 suppressed the expression of inflammatory cytokines including IL-1β, TNF-α and iNOS. Results indicate that MP101/MP201 may be a "disease modifying" treatment for MS by specifically modulating mitochondrial physiology. This would be a completely novel treatment for MS, targeting the mitochondria directly using a unique platform, mitochondrial uncouplers, that initially act non-genomically based upon biophysics, but cascades into cellular remodeling, neuroprotection and pro-survival. Clinical Phase I testing of MP101 in Normal Healthy Volunteers (NHV) is currently underway allowing for the potential to subsequently evaluate translation in MS patients and other insidious diseases, at expected weight neutral doses.
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http://dx.doi.org/10.1016/j.neuint.2019.104561DOI Listing
December 2019

Biomass-Derived Carbon Paper to Sandwich Magnetite Anode for Long-Life Li-Ion Battery.

ACS Nano 2019 Oct 9;13(10):11901-11911. Epub 2019 Oct 9.

National Laboratory of Solid State Microstructures (NLSSM), Collaborative Innovation Center of Advanced Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences , Nanjing University , Nanjing 210093 , China.

Metal oxides can deliver high capacity to Li-ion batteries, surpassing conventional graphite, but they suffer from a huge volume change during charging-discharging and poor cycle life. Herein, we merge the dual strategies of 3D-network support and sandwiching design to tackle such issue. We develop a skillful O-NH reactive pyrolysis of cellulose, where the preoxidation and the aminolysis result in the spatially separated charring of cellulose chains. A cellulose fiber is wonderfully converted into several ultrathin twisted graphenic sheets instead of a dense carbon fiber, and consequently, a cellulose paper is directly transformed into a porous flexible carbon paper with high surface area and conductivity (denoted as CP). CP is further fabricated as a 3D-network support into the hybrid [email protected]@RGO, where RGO is reduced graphene oxide added for sandwiching FeO particles. As a binder-free free-standing anode, [email protected]@RGO effectively fastens FeO and buffers the volume changes on cycling, which stabilizes the passivating layer and lifts the Coulombic efficiency. The anode thus presents an ultralong cycle life of >2000 running at a high capacity level of 1160 mAh g. It additionally facilitates electron and ion transports, boosting the rate capability. CP and [email protected]@RGO represent a technological leap underpinning next-generation long-life high-capacity high-power batteries.
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http://dx.doi.org/10.1021/acsnano.9b05978DOI Listing
October 2019

Tailored Design of Mesoporous PdCu Nanospheres with Different Compositions Using Polymeric Micelles.

ACS Appl Mater Interfaces 2019 Oct 25;11(40):36544-36552. Epub 2019 Sep 25.

School of Chemical Engineering and Australian Institute for Bioengineering and Nanotechnology (AIBN) , The University of Queensland , Brisbane Queensland 4072 , Australia.

Mesoporous metals have attracted a lot of interest due to their wide range of applications, particularly in catalysis. We previously reported the preparation of mesoporous Pd using block copolymer micelle templates ( , , 4054). Here we extend this synthetic concept to generate alloyed spherical palladium-copper (PdCu) nanoparticles with an open porous network and uniform morphology. This one-pot synthesis is initiated by water-induced micellization of the block copolymer, followed by the chemical reduction, nucleation, and growth of mesoporous spherical alloy nanoparticles. Porosity enables accessibility to numerous active sites throughout the interior and exterior surfaces of the nanoparticles. Mesoporous nanoparticles composed of Pd and Cu alloy exhibit enhanced electrocatalytic activity and stability in the ethanol oxidation reaction (EOR) and the oxygen reduction reaction (ORR).
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http://dx.doi.org/10.1021/acsami.9b09737DOI Listing
October 2019

Rational Design of Nanoporous MoS /VS Heteroarchitecture for Ultrahigh Performance Ammonia Sensors.

Small 2020 Mar 12;16(12):e1901718. Epub 2019 Sep 12.

School of Chemical Engineering and Australian Institute for Bioengineering and Nanotechnology (AIBN), The University of Queensland, Brisbane, QLD, 4072, Australia.

2D transition metal dichalcogenides (TMDs) have received widespread interest by virtue of their excellent electrical, optical, and electrochemical characteristics. Recent studies on TMDs have revealed their versatile utilization as electrocatalysts, supercapacitors, battery materials, and sensors, etc. In this study, MoS nanosheets are successfully assembled on the porous VS (P-VS ) scaffold to form a MoS /VS heterostructure. Their gas-sensing features, such as sensitivity and selectivity, are investigated by using a quartz crystal microbalance (QCM) technique. The QCM results and density functional theory (DFT) calculations reveal the impressive affinity of the MoS /VS heterostructure sensor toward ammonia with a higher adsorption uptake than the pristine MoS or P-VS sensor. Furthermore, the adsorption kinetics of the MoS /VS heterostructure sensor toward ammonia follow the pseudo-first-order kinetics model. The excellent sensing features of the MoS /VS heterostructure render it attractive for high-performance ammonia sensors in diverse applications.
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http://dx.doi.org/10.1002/smll.201901718DOI Listing
March 2020

Graphene Nanoarchitectonics: Recent Advances in Graphene-Based Electrocatalysts for Hydrogen Evolution Reaction.

Adv Mater 2019 Nov 8;31(48):e1903415. Epub 2019 Sep 8.

School of Chemical Engineering and Australian Institute for Bioengineering and Nanotechnology (AIBN), The University of Queensland, Brisbane, QLD, 4072, Australia.

Under the double pressures of both the energy crisis and environmental pollution, the exploitation and utilization of hydrogen, a clean and renewable power resource, has become an important trend in the development of sustainable energy-production and energy-consumption systems. In this regard, the electrocatalytic hydrogen evolution reaction (HER) provides an efficient and clean pathway for the mass production of hydrogen fuel and has motivated the design and construction of highly active HER electrocatalysts of an acceptable cost. In particular, graphene-based electrocatalysts commonly exhibit an enhanced HER performance owing to their distinctive structural merits, including a large surface area, high electrical conductivity, and good chemical stability. Considering the rapidly growing research enthusiasm for this topic over the last several years, herein, a panoramic review of recent advances in graphene-based electrocatalysts is presented, covering various advanced synthetic strategies, microstructural characterizations, and the applications of such materials in HER electrocatalysis. Lastly, future perspectives on the challenges and opportunities awaiting this emerging field are proposed and discussed.
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http://dx.doi.org/10.1002/adma.201903415DOI Listing
November 2019

Potential of Adult Endogenous Neural Stem/Progenitor Cells in the Spinal Cord to Contribute to Remyelination in Experimental Autoimmune Encephalomyelitis.

Cells 2019 09 3;8(9). Epub 2019 Sep 3.

Institute for Advanced Medical Sciences, Hyogo College of Medicine, 1-1 Mukogawacho, Nishinomiya, Hyogo 663-8501, Japan.

Demyelination and remyelination play pivotal roles in the pathological process of multiple sclerosis (MS) and experimental autoimmune encephalomyelitis (EAE), a well-established animal model of MS. Although increasing evidence shows that various stimuli can promote the activation/induction of endogenous neural stem/progenitor cells (NSPCs) in the central nervous system, the potential contributions of these cells to remyelination following inflammatory injury remain to be fully investigated. In the present study, using an adult mouse model of EAE induced by myelin oligodendrocyte glycoprotein (MOG) peptide, we investigated whether adult NSPCs in the spinal cord can lead to remyelination under inflammatory conditions. Immunohistochemistry showed that cells expressing the NSPC marker Nestin appeared after MOG peptide administration, predominantly at the sites of demyelination where abundant inflammatory cells had accumulated, whereas Nestin cells were rarely present in the spinal cord of PBS-treated control mice. In vitro, Nestin NSPCs obtained from EAE mice spinal cords could differentiate into multiple neural lineages, including neurons, astrocytes, and myelin-producing oligodendrocytes. Using the Cre-LoxP system, we established a mouse strain expressing yellow fluorescent protein (YFP) under the control of the promoter and investigated the expression patterns of YFP-expressing cells in the spinal cord after EAE induction. At the chronic phase of the disease, immunohistochemistry showed that YFP cells in the injured regions expressed markers for various neural lineages, including myelin-forming oligodendrocytes. These results show that adult endogenous NSPCs in the spinal cord can be subject to remyelination under inflammatory conditions, such as after EAE, suggesting that endogenous NSPCs represent a therapeutic target for MS treatment.
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http://dx.doi.org/10.3390/cells8091025DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6769975PMC
September 2019

Multiscale Buffering Engineering in Silicon-Carbon Anode for Ultrastable Li-Ion Storage.

ACS Nano 2019 Sep 22;13(9):10179-10190. Epub 2019 Aug 22.

State Key Laboratory of Multi-Phase Complex Systems, Institute of Process Engineering , Chinese Academy of Sciences (CAS) , Zhongguancun Beiertiao 1 Hao , Beijing 100190 , People's Republic of China.

Silicon-carbon (Si-C) hybrids have been proven to be the most promising anodes for the next-generation lithium-ion batteries (LIBs) due to their superior theoretical capacity (∼4200 mAh g). However, it is still a critical challenge to apply this material for commercial LIB anodes because of the large volume expansion of Si, unstable solid-state interphase (SEI) layers, and huge internal stresses upon lithiation/delithiation. Here, we propose an engineering concept of multiscale buffering, taking advantage of a nanosized Si-C nanowire architecture through fabricating specific microsized wool-ball frameworks to solve all the above-mentioned problems. These wool-ball-like frameworks, prepared at high yields, nearly matching industrial scales (they can be routinely produced at a rate of ∼300 g/h), are composed of Si/C nanowire building blocks. As anodes, the Si-C wool-ball frameworks show ultrastable Li storage (2000 mAh g for 1000 cycles), high initial Coulombic efficiency of ∼90%, and volumetric capacity of 1338 mAh cm. TEM proves that the multiscale buffering design enables a small volume variation, only ∼19.5%, reduces the inner stresses, and creates a very thin SEI. The perfect multiscale elastic buffering makes this material more stable compared to common Si nanoparticle-assembled counterpart electrodes.
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http://dx.doi.org/10.1021/acsnano.9b03355DOI Listing
September 2019

Intrinsic and Defect-Related Elastic Moduli of Boron Nitride Nanotubes As Revealed by Transmission Electron Microscopy.

Nano Lett 2019 Aug 10;19(8):4974-4980. Epub 2019 Jul 10.

International Center for Materials Nanoarchitectonics (MANA) , National Institute for Materials Science (NIMS) , 1-1 Namiki , Tsukuba , Ibaraki 305-0044 , Japan.

Boron nitride nanotubes (BNNTs) are promising for mechanical applications owing to the high modulus, high strength, and inert chemical nature. However, up to now, precise evaluation of their elastic properties and their relation to defects have not been experimentally established. Herein, the intrinsic elastic modulus of BNNTs and its dependence on intrinsic and deliberately irradiation-induced extrinsic defects have been studied via an electric-field-induced high-order resonance technique inside a high-resolution transmission electron microscope (HRTEM). Resonances up to fourth order for normal modes and third order for parametric modes have been initiated in the cantilevered tubes, and the recorded frequencies are well consistent with the theoretical calculations with a discrepancy of ∼1%. The elastic moduli of the BNNTs measured from high-order resonance is about 906.2 GPa on average, with a standard deviation of 9.3%, which is found to be closely related to the intrinsic defect as cavities in the nanotube walls. Furthermore, electron irradiation in HRTEM has been used to study the effects of defects to elastic moduli and to evaluate the radiation resistance of the BNNTs. Along with an increase in the irradiation dose, the outer diameter has linearly reduced due to the knock-on effects. A defective shell with nearly constant thickness has been formed on the outer surface, and as a result, the elastic modulus decreases gradually to ∼662.9 GPa, which is still 3 times that of steel. Excellent intrinsic elastic properties and decent radiation-resistance prove that BNNTs could be a material of choice for applications in extreme environments, such as those existing in space.
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http://dx.doi.org/10.1021/acs.nanolett.9b01170DOI Listing
August 2019

Synthesis of Mesoporous TiO-B Nanobelts with Highly Crystalized Walls toward Efficient H Evolution.

Nanomaterials (Basel) 2019 Jun 26;9(7). Epub 2019 Jun 26.

Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing 211800, China.

Mesoporous TiO is attracting increasing interest due to properties suiting a broad range of photocatalytic applications. Here we report the facile synthesis of mesoporous crystalline TiO-B nanobelts possessing a surface area as high as 80.9 m g and uniformly-sized pores of 6-8 nm. Firstly, P25 powders are dissolved in NaOH solution under hydrothermal conditions, forming sodium titanate (NaTiO) intermediate precursor phase. Then, HTiO is successfully obtained by ion exchange through acid washing from NaTiO via an alkaline hydrothermal treatment. After calcination at 450 °C, the HTiO is converted to a TiO-B phase. At 600 °C, another anatase phase coexists with TiO-B, which completely converts into anatase when annealed at 750 °C. Mesoporous TiO-B nanobelts obtained after annealing at 450 °C are uniform with up to a few micrometers in length, 50-120 nm in width, and 5-15 nm in thickness. The resulting mesoporous TiO-B nanobelts exhibit efficient H evolution capability, which is almost three times that of anatase TiO nanobelts.
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http://dx.doi.org/10.3390/nano9070919DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6669506PMC
June 2019
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