28,446 results match your criteria Catalysis Science & Technology[Journal]


Synthesis of silver nanoparticles utilizing various biological systems: mechanisms and applications-a review.

Prog Biomater 2020 Jul 11. Epub 2020 Jul 11.

University School of Environmental Management, Guru Gobind Singh Indraprastha University, Dwarka, New Delhi, India.

The evolving technology of nanoparticle synthesis, especially silver nanoparticle (AgNPs) has already been applied in various fields i.e., electronics, optics, catalysis, food, health and environment. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1007/s40204-020-00135-2DOI Listing

CoO-3D ordered mesoporous carbon nitride (CoO@mpgCN) composite as peroxymonosulfate activator for the degradation of sulfamethoxazole in water.

J Hazard Mater 2020 Jun 26;401:123326. Epub 2020 Jun 26.

Department of Marine Environmental Engineering, National Kaohsiung University of Science and Technology, City, Taiwan. Electronic address:

A facile impregnation method was used to fabricate a hybrid CoO-3D ordered mesoporous carbon nitride (CoO@mpgCN) catalyst that effectively activated peroxymonosulfate (PMS) for the degradation of pharmaceutical chemical, exemplified by antibiotic sulfamethoxazole (SMX) in aqueous solutions. The CoO@mpgCN/PMS system exhibited high catalytic reactivity and SMX removal efficiency over a wide pH range with an observed rate constant (k) of 0.314 min. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1016/j.jhazmat.2020.123326DOI Listing

A triple-chamber microbial fuel cell enabled to synchronously recover iron and sulfur elements from sulfide tailings.

J Hazard Mater 2020 Jun 24;401:123307. Epub 2020 Jun 24.

Laboratory of Environmental Biotechnology, School of Environmental and Civil Engineering, Jiangnan University, Wuxi 214122, PR China; Jiangsu Key Laboratory of Anaerobic Biotechnology, Wuxi 214122, PR China; Jiangsu Cooperative Innovation Center of Technology and Material of Water Treatment, Suzhou 215009, PR China; Jiangsu Engineering Laboratory for Biomass Energy and Carbon Reduction Technology, Wuxi 214122, PR China.

Bioleaching by coupling iron oxidization with microbial growth is a process frequently used to extract target metals from sulfide tailing piles. However, the slower leaching, longer operational times, and lower efficiency compared to those of other extracting processes are the most important reasons that make this approach unattractive for the recovery of target elements. A triple-chamber microbial fuel cell (MFC) was explored to elevate the dissolution of sulfide tailings via in-situ removal of bioleached Fe/Fe and SO, during which iron and SO ions were synchronously recovered as Fe(OH) and S° in the first and second cathode chambers, respectively. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1016/j.jhazmat.2020.123307DOI Listing

Enzyme Instructed Self-assembly of Naphthalimide-dipeptide: Spontaneous Transformation from Nanosphere to Nanotubular Structures that Induces Hydrogelation.

Chem Asian J 2020 Jul 11. Epub 2020 Jul 11.

National Chiao Tung University, Materials Science and Engineering, 1001 University Rd., 30010, Hsinchu, TAIWAN.

Understanding the structure-morphology relationships of the self-assembled nanostructures is very crucial for developing the materials with the desired chemical and biological functions. Here, phosphate-based naphthalimide (NI) derivatives have been developed for the first time to study the enzyme instructed self-assembly process. Self-assembly of simple amino acid derivative NI-Y p resulted in non-specific amorphous aggregates in the presence of alkaline phosphatase enzyme. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1002/asia.202000575DOI Listing

Merging Electrosynthesis and Bifunctional Squaramide Catalysis in the Asymmetric Detrifluoroacetylative Alkylation Reactions.

Angew Chem Int Ed Engl 2020 Jul 11. Epub 2020 Jul 11.

University of Science and Technology of China, Hefei National Laboratory for Physical Sciences at the Microscale, No.96, JinZhai Road Baohe District, 230026, Hefei, CHINA.

An enantioselective bifunctional squaramide-catalyzed detrifluoroacetylative alkylation reaction under electrochemical conditions has been developed. The unified strategy based on this key tandem methodology has been divergently explored for the asymmetric synthesis of fluorine-containing target molecules with good stereocontrol (up to 95% ee ). Furthermore, this catalytic asymmetric detrifluoroacetylative alkylation reaction demonstrated the benefits of combining electrosynthesis and organocatalysis for the preparation of biologically relevant products containing C-F tertiary stereogenic center. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1002/anie.202006903DOI Listing

Synergistic effects, gaseous products, and evolutions of NO precursors during (co-)pyrolysis of textile dyeing sludge and bamboo residues.

J Hazard Mater 2020 Jun 29;401:123331. Epub 2020 Jun 29.

Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, China.

This study aimed to investigate the synergistic influences of the textile dyeing sludge (TDS) and bamboo residues (BR) co-pyrolysis, and its effects on the formation mechanisms of NH and HCN. The mass loss rate was lower for TDS than BR, with the co-pyrolysis with 50% BR exerting the strongest synergistic effect. The pyrolysis stages 1 (< 400 °C) and 2 (400-800 °C) were best described using the diffusion and third-order reaction mechanisms, respectively. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1016/j.jhazmat.2020.123331DOI Listing

Non-thermal plasma-enhanced low-temperature catalytic desulfurization of electrolytic aluminum flue gas by CuO-ZrSnO: experimental and numerical analysis.

Environ Sci Pollut Res Int 2020 Jul 10. Epub 2020 Jul 10.

Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Jingmingnan Road 727, Kunming, 650000, China.

Catalytic desulfurization is favored for its ability to desulfurize low concentrations of SO by generating sulfur without the need for flue gas conditioning or additives. Maintaining reaction efficiency at a low temperature would justify the industrial scale use of this method. To that end, in this study, we modified a previously reported highly efficient CuO-ZrSnO catalyst and investigated its desulfurization performance. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1007/s11356-020-09602-6DOI Listing

Ameliorated Mechanical and Dielectric Properties of Heat-Resistant Radome Cyanate Composites.

Molecules 2020 Jul 8;25(14). Epub 2020 Jul 8.

Key Laboratory of Engineering Dielectrics and Its Application, Ministry of Education, School of Electrical and Electronic Engineering, Harbin University of Science and Technology, Harbin 150080, China.

In order to improve the mechanical and dielectric properties of radome cyanate, a synergistic reinforcement method is employed to develop a resin-based ternary-composite with high heat-resistance and preferable radar-band transmission, which is expected to be applied to fabricate radomes capable of resisting high temperature and strong electric field. According to copolymerization characteristics and self-curing mechanism, epoxy resin (EP) and bismaleimide (BMI) are employed as reinforcements mixed into a cyanate ester (CE) matrix to prepare CE/BMI/EP composites of a heat-resistant radome material by high-temperature viscous-flow blending methods under the catalysis of aluminum acetylpyruvate. The crystallization temperature, transition heat, and reaction rate of cured polymers were tested to analyze heat-resistance characteristics and evaluate material synthesis processes. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.3390/molecules25143117DOI Listing

Human riboflavin kinase: Species-specific traits in the biosynthesis of the FMN cofactor.

FASEB J 2020 Jul 10. Epub 2020 Jul 10.

Departamento de Bioquímica y Biología Molecular y Celular, Facultad de Ciencias, Universidad de Zaragoza, Zaragoza, Spain.

Human riboflavin kinase (HsRFK) catalyzes vitamin B (riboflavin) phosphorylation to flavin mononucleotide (FMN), obligatory step in flavin cofactor synthesis. HsRFK expression is related to protection from oxidative stress, amyloid-β toxicity, and some malignant cancers progression. Its downregulation alters expression profiles of clock-controlled metabolic-genes and destroys flavins protection on stroke treatments, while its activity reduction links to protein-energy malnutrition and thyroid hormones decrease. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1096/fj.202000566RDOI Listing

Surface engineering of magnetic iron oxide nanoparticles by polymer grafting: synthesis progress and biomedical applications.

Nanoscale 2020 Jul 10. Epub 2020 Jul 10.

Key Laboratory of Materials Chemistry for Energy Conversion and Storage of Ministry of Education (HUST), School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology (HUST), Wuhan 430074, China.

Magnetic iron oxide nanoparticles (IONPs) have wide applications in magnetic resonance imaging (MRI), biomedicine, drug delivery, hyperthermia therapy, catalysis, magnetic separation, and others. However, these applications are usually limited by irreversible agglomeration of IONPs in aqueous media because of their dipole-dipole interactions, and their poor stability. A protecting polymeric shell provides IONPs with not only enhanced long-term stability, but also the functionality of polymer shells. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1039/d0nr03346dDOI Listing

Operando potassium K-edge X-ray absorption spectroscopy: investigating potassium catalysts during soot oxidation.

Phys Chem Chem Phys 2020 Jul 10. Epub 2020 Jul 10.

Department of Chemistry, Loughborough University, Loughborough, Leicestershire LE113TU, UK.

The chemical and structural nature of potassium compounds involved in catalytic soot oxidation have been studied by a combination of temperature programmed oxidation and operando potassium K-edge X-ray absorption spectroscopy experiments. These experiments are the first known operando studies using tender X-rays (∼3.6 keV) under high temperature oxidation reaction conditions. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1039/d0cp01227kDOI Listing

Probing the design rationale of a high-performing faujasitic zeotype engineered with hierarchical porosity and moderated acidity.

Angew Chem Int Ed Engl 2020 Jul 10. Epub 2020 Jul 10.

University of Southampton, Chemistry, University Road, Highfield, SO171BJ, Southampton, UNITED KINGDOM.

Porosity and acidity are influential properties in the rational design of solid-acid catalysts. Probing the physicochemical characteristics of an acidic zeotype framework at the molecular level can provide valuable insights in understanding intrinsic reaction pathways, for affording structure-activity relationships. Herein, we employ a variety of probe-based techniques (including positron annihilation lifetime spectroscopy (PALS), FTIR and solid-state NMR) to demonstrate how a hierarchical design strategy for a faujasitic (FAU) zeotype (synthesized for the first time, via a soft-templating approach, with high phase-purity) can be used to simultaneously modify the porosity and modulate the acidity for an industrially-significant catalytic process (Beckmann rearrangement). Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1002/anie.202005108DOI Listing

An Ultrastable, Small {Ag } Nanocluster within a Triangular Hollow Polyoxometalate Framework.

Angew Chem Int Ed Engl 2020 Jul 10. Epub 2020 Jul 10.

Department of Applied Chemistry, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan.

Small Ag nanoclusters (n<10) have been emerging as promising materials as sensing, biolabeling, and catalysis because of their unique electronic states and optical properties. However, studying synthesis, structure determination, and exploration of their properties remain major challenges as a result of the low stability of small Ag nanoclusters. Herein, we synthesized an atomically precise face-centered-cubic-type small {Ag } nanocluster supported by a novel triangular hollow polyoxometalate (POM) framework [Si W O ] . Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1002/anie.202008402DOI Listing

Axial modification of cobalt complexes on heterogeneous surface with enhanced electron transfer for carbon dioxide reduction.

Angew Chem Int Ed Engl 2020 Jul 9. Epub 2020 Jul 9.

Southern University of Science and Technology, Department of Physics, CHINA.

Efficient electron communication between molecular catalyst and support is critical for heterogeneous molecular electrocatalysis and yet it is often overlooked during the catalyst design. Taking CO 2 electro-reduction on tetraphenylporphyrin cobalt (PCo) immobilized onto graphene as an example, we demonstrate that adding a relay molecule improves the interfacial electron communication. While the directly immobilized PCo on graphene exhibits relatively poor electron communications, it is found that diphenyl sulfide serves as an axial ligand for PCo and it improves the redox activity of PCo on the graphene surface to facilitate the generation of [PCo] • ‾ active sites for CO 2 reduction. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1002/anie.202008759DOI Listing

Accelerating high-resolution NMR of half-integer quadrupolar nuclei in solids: SPAM-MQMAS and SPAM-STMAS.

Solid State Nucl Magn Reson 2020 May 13;108:101668. Epub 2020 May 13.

Univ. Lille, CNRS, Centrale Lille, ENSCL, Univ. Artois, UMR 8181 - UCCS - Unit of Catalysis and Chemistry of Solids, F-59000, Lille, France; Bruker Biospin, 34 rue de l'industrie, F-67166, Wissembourg, France; RIKEN RSC NMR Science and Development Division, 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama-shi, Kanagawa, 230-0045, Japan. Electronic address:

In solid-state NMR, multiple-quantum MAS (MQMAS) and satellite-transition MAS (STMAS) experiments are well-established techniques to obtain high-resolution spectra of half-integer quadrupolar nuclei. In 2004 and 2005, a soft-pulse-added-mixing (SPAM) concept was introduced by Gan and Amoureux to enhance the S/N ratio of MQMAS and STMAS experiments. Despite their robustness and simplicity, SPAM approaches have not yet been widely applied. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1016/j.ssnmr.2020.101668DOI Listing

Pollution profiles of antibiotic resistance genes associated with airborne opportunistic pathogens from typical area, Pearl River Estuary and their exposure risk to human.

Environ Int 2020 Jul 6;143:105934. Epub 2020 Jul 6.

Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control, School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou 510006, China. Electronic address:

To reveal the selective pressures of near-shore human activities on marine and continental bioaerosols, the pollution profile and potential exposure risk of airborne pathogens and antibiotic-resistance genes (ARGs) in Pearl River Estuaries (113.52 E, 22.69 N), a transitional zone between marine and continental environments, were fully explored. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1016/j.envint.2020.105934DOI Listing

3D Printing of an Grown MOF Hydrogel with Tunable Mechanical Properties.

ACS Appl Mater Interfaces 2020 Jul 9. Epub 2020 Jul 9.

Department of Chemical & Biomolecular Engineering, Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland 21218, United States.

Due to their precisely modifiable microporosity and chemical functionality, Metal-Organic Frameworks (MOFs) have revolutionized catalysis, separations, gas storage, drug delivery, and sensors. However, because of their rigid and brittle powder morphology, it is challenging to build customizable MOF shapes with tunable mechanical properties. Here, we describe a new three-dimensional (3D) printing approach to create stretchable and tough MOF hydrogel structures with tunable mechanical properties. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1021/acsami.0c08880DOI Listing

Unidimensional Approximation of the Diffuse Electrical Layer in the Inner Volume of Solid Electrolyte Grains in Absence of Background Ions.

Chemphyschem 2020 Jul 9. Epub 2020 Jul 9.

Institute of Chemistry and Chemical Technology SB RAS, Federal Research Center "Krasnoyarsk Science Center SB RAS", Laboratory for Catalytic Conversion of Renewable Resources, Akademgorodok 50/24, 660036, Krasnoyarsk, RUSSIAN FEDERATION.

In this paper we continue working on our theory of electrical double layers resulting exclusively from dissociation of a solid electrolyte, which we previously proposed as a medium for catalytic interaction between solid cellulose and solid acid catalysts of hydrolysis. Two theoretical unidimensional models of the inner grain volume are considered: an infinitely long cylindrical pore, and a gel electrolyte near a grain outer surface. Despite the model simplicity, the predictions for the cylindrical pore case are in semi-quantitative agreement with literature data on electroosmotic experiments, adequately explaining high proton selectivity of sulfonic membranes, and decline of such selectivity at high background acid concentration. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1002/cphc.202000455DOI Listing

A Woven Supramolecular Metal-Organic Framework Comprising a Ruthenium Bis(terpyridine) Complex and Cucurbit[8]uril: Enhanced Catalytic Activity toward Alcohol Oxidation.

Chempluschem 2020 Jul;85(7):1498-1503

Department of Chemistry Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, 2205 Songhu Road, Shanghai, 200438, P. R. China.

The self-assembly of a diamondoid woven supramolecular metal-organic framework wSMOF-1 has been achieved from intertwined [Ru(tpy) ] (tpy=2,2',6',2''-terpyridine) complex M1 and cucurbit[8]uril (CB[8]) in water, where the intermolecular dimers formed by the appended aromatic arms of M1 are encapsulated in CB[8]. wSMOF-1 exhibits ordered pore periodicity in both water and the solid state, as confirmed by a combination of H NMR spectroscopy, UV-vis absorption, isothermal titration calorimetry, dynamic light scattering, small angle X-ray scattering and selected area electron diffraction experiments. The woven framework has a pore aperture of 2. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1002/cplu.202000391DOI Listing

Continuous Synthesis of Aryl Amines from Phenols Utilizing Integrated Packed-Bed Flow Systems.

Angew Chem Int Ed Engl 2020 Jul 9. Epub 2020 Jul 9.

Interdisciplinary Research Center for Catalytic Chemistry (IRC3), National Institute of Advanced Industrial Science and Technology (AIST), Central 5, Higashi 1-1-1, Tsukuba, Ibaraki, 305-8565, Japan.

Aryl amines are important pharmaceutical intermediates among other numerous applications. Herein, an environmentally benign route and novel approach to aryl amine synthesis using dehydrative amination of phenols with amines and styrene under continuous-flow conditions was developed. Inexpensive and readily available phenols were efficiently converted into the corresponding aryl amines, with small amounts of easily removable co-products (i. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1002/anie.202005109DOI Listing

Unravelling the Enigma of Nonoxidative Conversion of Methane on Iron Single-Atom Catalysts.

Angew Chem Int Ed Engl 2020 Jul 9. Epub 2020 Jul 9.

Xi'an Jiaotong University, school of mechanical engineering, CHINA.

The direct, nonoxidative conversion of methane on silica-confined single-atom iron catalyst (Fe 1 ©SiO 2 ) by Bao et al . ( Science , 2014, 344 , 616) is a landmark discovery in catalysis science. However, the initially proposed gas-phase reaction mechanism has been much debated. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1002/anie.202003908DOI Listing

trans-Selective Aryldifluoroalkylation of Endocyclic Enecarbamates and Enamides via Nickel Catalysis.

Angew Chem Int Ed Engl 2020 Jul 8. Epub 2020 Jul 8.

Shanghai Institute of Organic Chemistry Chinese Academy of Science, Key Laboratory of Organofluorine Chemistry, 345 Lingling Lu, 200032, Shanghai, CHINA.

2-Pyrroline and 2-azetine are useful synthons for the synthesis of pyrrolidines and azetidines that widely exist in natural products, pharmaceuticals, and agrochemicals. But efficient methods for dicarbofuntionalization of these cyclic alkenes are limited. Particularly, the dicarbofunctionalization of endocyclic enecarbamates to achieve fluorinated compounds remains an unsolved issue, despite of the wide applications of organofluorinated molecules in life and materials science. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1002/anie.202008498DOI Listing

Comparative Study of Selenides and Tellurides of Transition Metals (Nb and Ta) with Respect to its Catalytic, Antimicrobial, and Molecular Docking Performance.

Nanoscale Res Lett 2020 Jul 8;15(1):144. Epub 2020 Jul 8.

Solar Cell Applications Research Lab, Department of Physics, Government College University, Lahore, Punjab, 54000, Pakistan.

The present research is a comparative study that reports an economical and accessible method to synthesize niobium (Nb) and Tantalum (Ta) selenides and tellurides with useful application in the removal of pollutants in textile, paper, and dyeing industries as well as in medical field. In this study, solid-state process was used to generate nanocomposites and various characterization techniques were employed to compare two groups of materials under investigation. Structure, morphology, elemental constitution, and functional groups of synthesized materials were analyzed with XRD, FESEM coupled with EDS, FTIR, and Raman spectroscopy, respectively. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1186/s11671-020-03375-0DOI Listing

Development of non-nucleoside reverse transcriptase inhibitors (NNRTIs): our past twenty years.

Acta Pharm Sin B 2020 Jun 21;10(6):961-978. Epub 2019 Nov 21.

Engineering Center of Catalysis and Synthesis for Chiral Molecules, Department of Chemistry, Fudan University, Shanghai 200433, China.

Human immunodeficiency virus (HIV) is the primary infectious agent of acquired immunodeficiency syndrome (AIDS), and non-nucleoside reverse transcriptase inhibitors (NNRTIs) are the cornerstone of HIV treatment. In the last 20 years, our medicinal chemistry group has made great strides in developing several distinct novel NNRTIs, including 1-[(2-hydroxyethoxy)methyl]-6-(phenylthio)thymine (HEPT), thio-dihydro-alkoxy-benzyl-oxopyrimidine (-DABO), diaryltriazine (DATA), diarylpyrimidine (DAPY) analogues, and their hybrid derivatives. Application of integrated modern medicinal strategies, including structure-based drug design, fragment-based optimization, scaffold/fragment hopping, molecular/fragment hybridization, and bioisosterism, led to the development of several highly potent analogues for further evaluations. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1016/j.apsb.2019.11.010DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7332669PMC

Unveiling hydrocerussite as an electrochemically stable active phase for efficient carbon dioxide electroreduction to formate.

Nat Commun 2020 Jul 8;11(1):3415. Epub 2020 Jul 8.

Institute of Molecular Plus, Department of Chemistry, School of Science, Tianjin University, Tianjin, 300072, China.

For most metal-containing CO reduction reaction (CORR) electrocatalysts, the unavoidable self-reduction to zero-valence metal will promote hydrogen evolution, hence lowering the CORR selectivity. Thus it is challenging to design a stable phase with resistance to electrochemical self-reduction as well as high CORR activity. Herein, we report a scenario to develop hydrocerussite as a stable and active electrocatalyst via in situ conversion of a complex precursor, tannin-lead(II) (TA-Pb) complex. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1038/s41467-020-17120-9DOI Listing

Synthesis of an N-Heterocyclic Carbene-based Au(I) Coordinate Surfactant: Application for Alkyne Hydration Based on Au Nanoparticle Formation.

J Oleo Sci 2020 Jul 9. Epub 2020 Jul 9.

National Institute of Advanced Industrial Science and Technology (AIST).

In this study, an N-heterocyclic carbene (NHC)-based metal coordinate surfactant (MCS), NHC-Au-MCS, in which the NHC framework afforded the bonding of the Au(I) at the linkage of the hydrophilic and hydrophobic moieties, was synthesized. The structure of NHC-Au-MCS was confirmed by H and C NMR spectroscopic measurements together with elemental analysis. Matrix-assisted laser desorption/ionization (MALDI), laser desorption/ionization (LDI), and electrospray ionization mass spectrometry (ESIMS) indicated the distinct reactivity of NHC-Au-MCS, such as the exchange of Br to Cl and the formation of a cationic Au complex, where the two NHC ligands were coordinated to an Au(I) center upon laser activation. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.5650/jos.ess20063DOI Listing

Electroactivation-induced IrNi nanoparticles under different pH conditions for neutral water oxidation.

Nanoscale 2020 Jul 8. Epub 2020 Jul 8.

Clean Energy Research Center, Korea Institute of Science and Technology (KIST), Hwarang-ro 14-gil 5, Seongbuk-gu, Seoul 02792, Republic of Korea. and Division of Energy and Environmental Technology, KIST school, Korea University of Science and Technology, Seoul 02792, Republic of Korea.

Electrochemical oxidation processes can affect the electronic structure and activate the catalytic performance of precious-metal and transition-metal based catalysts for the oxygen evolution reaction (OER). Also there are emerging requirements to develop OER electrocatalysts under various pH conditions in order to couple with different reduction reactions. Herein, we studied the effect of pH on the electroactivation of IrNi alloy nanoparticles supported on carbon (IrNi/C) and evaluated the electrocatalytic activities of the activated IrNiOx/C for water oxidation under neutral conditions. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1039/d0nr02951cDOI Listing

Conversion of racemic alcohols to optically pure amine precursors enabled by catalyst dynamic kinetic resolution: experiment and computation.

Chem Commun (Camb) 2020 Jul 8. Epub 2020 Jul 8.

Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany.

An unprecedented base metal catalysed asymmetric synthesis of α-chiral amine precursors from racemic alcohols is reported. This redox-neutral reaction utilises a bench-stable manganese complex and Ellman's sulfinamide as a versatile ammonia surrogate. DFT calculations explain the unusual finding of the highly stereoselective transformation enabled by a catalyst that undergoes an unusual dynamic kinetic resolution. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1039/d0cc02881aDOI Listing

Amorphous/low-crystalline core/shell-type nanoparticles as highly efficient and self-stabilizing catalysts for alkaline hydrogen evolution.

Chem Commun (Camb) 2020 Jul 8. Epub 2020 Jul 8.

Graduate School of Science and Technology, Shinshu University, Ueda 386-8567, Japan.

Amorphous/low-crystalline core/shell-type nanoparticles (Pd-P/Pt-Ni NPs) were prepared via a facile seed-mediated method. After acid treatment, the NPs exhibited self-improved catalysis for hydrogen evolution during electrolysis in an alkaline medium. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1039/d0cc03016cDOI Listing

Nanopore-Supported Metal Nanocatalysts for Efficient Hydrogen Generation from Liquid-Phase Chemical Hydrogen Storage Materials.

Adv Mater 2020 Jul 8:e2001818. Epub 2020 Jul 8.

State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun, 130012, P. R. China.

Hydrogen has emerged as an environmentally attractive fuel and a promising energy carrier for future applications to meet the ever-increasing energy challenges. The safe and efficient storage and release of hydrogen remain a bottleneck for realizing the upcoming hydrogen economy. Hydrogen storage based on liquid-phase chemical hydrogen storage materials is one of the most promising hydrogen storage techniques, which offers considerable potential for large-scale practical applications for its excellent safety, great convenience, and high efficiency. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1002/adma.202001818DOI Listing
July 2020
17.493 Impact Factor

Flexible Type Symmetric Supercapacitor Electrode Fabrication Using Phosphoric Acid-Activated Carbon Nanomaterials Derived from Cow Dung for Renewable Energy Applications.

ACS Omega 2020 Jun 22;5(25):15028-15038. Epub 2020 Jun 22.

Surfactant Research Chair, Chemistry Department, College of Science, King Saud University, Riyadh 11451, Saudi Arabia.

Porous-activated carbon (PAC) materials have been playing a vital role in meeting the challenges of the ever-increasing demand for alternative clean and sustainable energy technologies. In the present scenario, a facile approach is suggested to produce hierarchical PAC at different activation temperatures in the range of 600 to 900 °C by using cow dung (CD) waste as a precursor, and HPO is adopted as the nonconventional activating agent to obtain large surface area values. The as-prepared cow dung-based PAC (CDPAC) is graphitic in nature with mixed micro- and mesoporous textures. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1021/acsomega.0c00848DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7330913PMC

Catalytic Conversion of Carbon Dioxide Using Binuclear Double-Stranded Helicates: Cyclic Carbonate from Epoxides and Diol.

ACS Omega 2020 Jun 19;5(25):14890-14899. Epub 2020 Jun 19.

Inorganic Materials and Catalysis Discipline, CSIR-Central Salt and Marine Chemicals Research Institute, Bhavnagar, Gujarat 364002, India.

The construction of sophisticated molecular architectures from chemical subunits requires careful selection of the spacers, precise synthetic strategies, and substantial efforts. Here, we report a series of binuclear double-stranded helicates synthesized from different combinations of pyridyl hydrazone-based multidentate ligands (H, H, H) by increasing the methylene spacer and transition metals (Co, Ni, and Zn). The ligands H ('1,'3-bis(()-pyridin-2-ylmethylene)malonohydrazide), H ('1,'4-bis(()-pyridin-2-ylmethylene)succinohydrazide), and H ('1,'5-bis(()-pyridin-2-ylmethylene)glutarohydrazide) and their respective complexes with Co, Ni, and Zn were obtained. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1021/acsomega.9b04241DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7330893PMC

Methanol conversion on borocarbonitride catalysts: Identification and quantification of active sites.

Sci Adv 2020 Jun 24;6(26):eaba5778. Epub 2020 Jun 24.

State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fuzhou 350016, China.

Borocarbonitrides (BCNs) have emerged as highly selective catalysts for the oxidative dehydrogenation (ODH) reaction. However, there is a lack of in-depth understanding of the catalytic mechanism over BCN catalysts due to the complexity of the surface oxygen functional groups. Here, BCN nanotubes with multiple active sites are synthesized for oxygen-assisted methanol conversion reaction. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1126/sciadv.aba5778DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7314531PMC

Controlled Release of Doxorubicin from the Drug Delivery Formulation Composed of Single-Walled Carbon Nanotubes and Congo Red: A Molecular Dynamics Study and Dynamic Light Scattering Analysis.

Pharmaceutics 2020 Jul 3;12(7). Epub 2020 Jul 3.

Institute of Catalysis and Surface Chemistry, Polish Academy of Science, Niezapominajek 8, 30-239 Krakow, Poland.

The controlled delivery and release of drug molecules at specific targets increases the therapeutic efficacy of treatment. This paper presents a triple complex which is a new potential drug delivery system. Triple complex contains single-walled carbon nanotubes, Congo red, and doxorubicin. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.3390/pharmaceutics12070622DOI Listing

Highly Reactive Cyclic Monoaryl Iodoniums Tuned as Carbene Generators Couple with Nucleophiles under Metal-Free Conditions.

iScience 2020 Jun 23;23(7):101307. Epub 2020 Jun 23.

State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Sun Yat-sen University Cancer Center, 651 Dongfeng East Road, Guangzhou 510060, China. Electronic address:

Cross-coupling reactions between aryl iodide and nucleophiles have been well developed. Iodoniums equipped with a reactive C-I(III) bond accelerate cross-coupling reactions of aryl iodide. Among them, cyclic diaryliodoniums are more atom economical; however; they are often in the trap of metal reliance and encounter regioselectivity issues. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1016/j.isci.2020.101307DOI Listing

CuO@CoFe Layered Double Hydroxide Core-Shell Heterostructure as an Efficient Water Oxidation Electrocatalyst under Mild Alkaline Conditions.

Inorg Chem 2020 Jul 7. Epub 2020 Jul 7.

Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, Sichuan, China.

Designing hierarchical electrocatalysts with superior water oxidation performance is highly desirable for the production of renewable chemical fuels. Here, we report the development of a CuO@CoFe layered double hydroxide core-shell heterostructure supported on Cu foil (CuO@CoFe-LDH/CF) as a highly active catalyst electrode for water oxidation under mild alkaline conditions. In a 0. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1021/acs.inorgchem.0c01927DOI Listing

In situ modification of BiVO nanosheets on graphene for boosting photocatalytic water oxidation.

Nanoscale 2020 Jul 7. Epub 2020 Jul 7.

State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.

Owing to the sluggish water oxidation process, unearthing an ideal model for disclosing the impact of an architectural approach on the water oxidation activity of photocatalysts becomes a vital issue. Here, we propose an innovative in situ modification strategy for constructing ultrapure BiVO4 nanosheets on graphene (u-BVG) toward the accelerated photocatalytic water oxidation reaction. Considering the Mott-Schottky heterojunctions at the contact interface in u-BVG, the feasible electron transfer from excited BiVO4 to graphene facilitates the holes to migrate onto the BiVO4 surface for the water oxidation reaction. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1039/d0nr02718aDOI Listing

Selective 1,2-Aryl-aminoalkylation of Alkenes Enabled by Metallaphotoredox Catalysis.

Angew Chem Int Ed Engl 2020 Jul 6. Epub 2020 Jul 6.

Huazhong University of Science and Technology, School of Chemistry and Chemical Engineering, CHINA.

A highly chemo- and regioselective intermolecular 1,2-aryl-aminoalkylation of alkenes by photoredox/nickel dual catalysis is described here. This three-component conjunctive cross-coupling is highlighted by its first application of primary alkyl radicals, which are not compatible in previous reports. The readily prepared α-silyl amines could be transferred to α-amino radicals by photo-induced single electron transfer step. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1002/anie.202006439DOI Listing

Amide derivatives of Gallic acid: Design, synthesis and evaluation of inhibitory activities against in vitro α-synuclein aggregation.

Bioorg Med Chem 2020 Aug 17;28(15):115596. Epub 2020 Jun 17.

College of Pharmacy, Xinxiang Medical University, Jinsui Road 601, 453003 Xinxiang, China. Electronic address:

Gallic acid (GA), a natural phenolic acid, has received numerous attention because of its anti-oxidative, anti-inflammatory, and anti-cancer activity. More importantly, GA can act as an efficient inhibitor of α-Synuclein (α-Syn) aggregation at early stages. Nevertheless, some evidences suggest that GA is unlikely to cross the blood-brain barrier because of its high hydrophilicity. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1016/j.bmc.2020.115596DOI Listing

() and () Genes Influence on Semolina Yellowness in Wheat Mediterranean Germplasm.

Int J Mol Sci 2020 Jun 30;21(13). Epub 2020 Jun 30.

Departamento de Ciencias Vegetales, Facultad de Agronomía e Ingeniería Forestal, Pontificia Universidad Católica de Chile, Santiago 306-22, Chile.

() and (-1) are key genes involved in the synthesis and catalysis of carotenoid pigments in durum wheat, regulating the increase and decrease in these compounds, respectively, resulting in the distinct yellow color of semolina and pasta. Here, we reported new haplotype variants and/or allele combinations of these two genes significantly affecting yellow pigment content in grain and semolina through their effect on carotenoid pigments. To reach the purpose of this work, three complementary approaches were undertaken: the identification of QTLs associated to carotenoid content on a recombinant inbred line (RIL) population, the characterization of a Mediterranean panel of accessions for and genes, and monitoring the expression of and genes during grain filling on two genotypes with contrasting yellow pigments. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.3390/ijms21134669DOI Listing

Nanoparticle Recognition on Scanning Probe Microscopy Images Using Computer Vision and Deep Learning.

Nanomaterials (Basel) 2020 Jun 30;10(7). Epub 2020 Jun 30.

Boreskov Institute of Catalysis SB RAS, pr. Acad. Lavrentieva, 5, 630090 Novosibirsk, Russia.

Identifying, counting and measuring particles is an important component of many research studies. Images with particles are usually processed by hand using a software ruler. Automated processing, based on conventional image processing methods (edge detection, segmentation, etc. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.3390/nano10071285DOI Listing

Artificial Metalloenzymes: From Selective Chemical Transformations to Biochemical Applications.

Molecules 2020 Jun 30;25(13). Epub 2020 Jun 30.

Frontier Research Institute for Interdisciplinary Sciences, Tohoku University, 6-3 Aramaki aza Aoba, Aoba-ku, Sendai 980-8578, Japan.

Artificial metalloenzymes (ArMs) comprise a synthetic metal complex in a protein scaffold. ArMs display performances combining those of both homogeneous catalysts and biocatalysts. Specifically, ArMs selectively catalyze non-natural reactions and reactions inspired by nature in water under mild conditions. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.3390/molecules25132989DOI Listing

Nickel-Containing Ceria-Zirconia Doped with Ti and Nb. Effect of Support Composition and Preparation Method on Catalytic Activity in Methane Dry Reforming.

Nanomaterials (Basel) 2020 Jun 30;10(7). Epub 2020 Jun 30.

Laboratory of Deep Oxidation Catalysts, Boreskov Institute of Catalysis, 630090 Novosibirsk, Russia.

Nickel-containing mixed ceria-zirconia oxides also doped by Nb and Ti have been prepared by a citrate route and by original solvothermal continuous flow synthesis in supercritical alcohols. Nickel was subsequently deposited by conventional insipient wetness impregnation. The oxides are comprised of ceria-zirconia solid solution with cubic fluorite phase. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.3390/nano10071281DOI Listing

A 'one-tube' synthesis of a selective fluorescence 'turn off/on' DNA probe based on a C-phycocyanin-graphene oxide (CPC-GO) bio composite.

Int J Biol Macromol 2020 Jul 3. Epub 2020 Jul 3.

Applied Phycology and Biotechnology Division, CSIR - Central Salt and Marine Chemicals Research Institute, Gijubhai Badheka Marg, Bhavnagar 364002, Gujarat, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, Uttar Pradesh, India. Electronic address:

A naturally fluorescent protein, C-phycocyanin (CPC), was used as a fluorophore to study the effect of graphene oxide (GO) as a quencher. The protein was purified using established procedures and titrated with increasing GO concentrations. UV-visible titration showed a minor effect on the phycocyanobilin absorbance but significant interactions with the amino acid backbone. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1016/j.ijbiomac.2020.06.286DOI Listing

Carrier Induced Modification of Palladium Nanoparticles on Porous Boron Nitride for Alkyne Semi-Hydrogenation.

Angew Chem Int Ed Engl 2020 Jul 6. Epub 2020 Jul 6.

ETH Zurich, Institute for Chemical and Bioengineering, ETH Hönggerberg, Vladimir-Prelog-Weg 1, HCI E125, CH-8093, Zurich, SWITZERLAND.

Chemical modifiers enhance the efficiency of metal catalysts in numerous applications, but their introduction often involves toxic or expensive precursors and complicates the synthesis. Here, we show that a porous boron nitride carrier can directly modify supported palladium nanoparticles, originating unparalleled performance in the continuous semi-hydrogenation of alkynes. Analysis of the impact of various structural parameters reveals that using a defective high surface area boron nitride and ensuring a palladium particle size of 4-5 nm is critical to maximizing the specific rate. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1002/anie.202005842DOI Listing

Topologically Nontrivial Phase-Change Compound GeSbTe.

ACS Nano 2020 Jul 6. Epub 2020 Jul 6.

Department of Physical Sciences, Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8526, Japan.

Chalcogenide phase-change materials show strikingly contrasting optical and electrical properties, which has led to their extensive implementation in various memory devices. By performing spin-, time-, and angle-resolved photoemission spectroscopy combined with the first-principles calculation, we report the experimental results that the crystalline phase of GeSbTe is topologically nontrivial in the vicinity of the Dirac semimetal phase. The resulting linearly dispersive bulk Dirac-like bands that cross the Fermi level and are thus responsible for conductivity in the stable crystalline phase of GeSbTe can be viewed as a 3D analogue of graphene. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1021/acsnano.0c04145DOI Listing

Bidirectional Catalysts for Liquid-Solid Redox Conversion in Lithium-Sulfur Batteries.

Adv Mater 2020 Jul 6:e2000315. Epub 2020 Jul 6.

Nanoyang Group, State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China.

Accelerated conversion by catalysis is a promising way to inhibit shuttling of soluble polysulfides in lithium-sulfur (Li-S) batteries, but most of the reported catalysts work only for one direction sulfur reaction (reduction or oxidation), which is still not a root solution since fast cycled use of sulfur species is not finally realized. A bidirectional catalyst design, oxide-sulfide heterostructure, is proposed to accelerate both reduction of soluble polysulfides and oxidation of insoluble discharge products (e.g. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1002/adma.202000315DOI Listing

Morphology control, spectrum modification and extended optical applications of rare earth ion doped phosphors.

Phys Chem Chem Phys 2020 Jul 6. Epub 2020 Jul 6.

College of Electronic and Optical Engineering & College of Microelectronics, Nanjing University of Posts and Telecommunications, Nanjing, 210023, China.

Rare earth ion (RE3+) doped nano-phosphors with controllable morphologies have a wide range of applications in laser crystals, LEDs, bio-probes, photo-catalysis, three-dimensional displays, sensors, and flash memories. This review summarizes the morphology control strategy, phase transfer theory, spectrum modulation, and extended optical applications of RE3+-doped phosphors. The roles of surfactants in the morphology control in the liquid-solid-solution phase transfer process for RE3+-doped fluorides, oxides and other compounds are discussed. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1039/d0cp01412eDOI Listing

-Silylative Ring-Opening of α-Methyl Azacycles Enabled by the Silylium-Induced C-N Bond Cleavage.

J Am Chem Soc 2020 Jul 10. Epub 2020 Jul 10.

Center for Catalytic Hydrocarbon Functionalizations, Institute for Basic Science (IBS), Daejeon 34141, South Korea.

Described herein is the development of a borane-catalyzed -silylative ring-opening of α-methyl azacycles. This transformation involves four-step cascade processes: (i) -dehydrogenation of alicyclic amine, (ii) hydrosilylation of the resultant enamine, (iii) silylium-induced -β-amino elimination to open the ring skeleton, and (iv) hydrosilylation of the terminal olefin. The present borane catalysis also works efficiently for the C-N bond cleavage of acyclic tertiary amines. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1021/jacs.0c05241DOI Listing

Synthesis of Core-Shell Magnetic Supramolecular Nanocatalysts based on Amino-Functionalized Calix[4]arenes for the Synthesis of -Chromenes by Ultrasonic Waves.

ChemistryOpen 2020 Jul 24;9(7):735-742. Epub 2020 Mar 24.

School of Mechanical Engineering Iran University of Science and Technology Tehran Iran.

One of the most common phenol-formaldehyde cyclic oligomers from hydroxyalkylation reactions that exhibit supramolecular chemistry are calixarenes. These macrocyclic compounds are qualified to act as synthetic catalysts due to their specific features including being able to form host-guest complexes, having unique structural scaffolds and their relative ease of chemical modifications with a variety of functions on their upper rim and lower rim. Here, a functional magnetic nanocatalyst was designed and synthesized by using a synthetic amino-functionalized calix[4]arene. Read More

View Article

Download full-text PDF

Source
http://dx.doi.org/10.1002/open.202000005DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7327476PMC