50,779 results match your criteria Nanoscale research letters[Journal]


Light-induced mechanisms for nanocarrier's cargo release.

Colloids Surf B Biointerfaces 2019 Jan 25;173:825-832. Epub 2018 Oct 25.

Nanobiotechnology for diagnostics group (Nb4D), Department of Chemical and Biomolecular Nanotechnology, Institute for Advanced Chemistry of Catalonia (IQAC) of the Spanish Council for Scientific Research (CSIC), Spain; CIBER de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Jordi Girona 18-26, 08034 Barcelona, Spain.

Nanomaterials have been the focus of attention in several fields, including biomedicine, electronics, or catalysis, mainly due to the novel properties of the materials at the nanoscale. In the field of diagnosis, nanomaterials have been contemplated as an opportunity to improve sensitivity and time of response, therefore, facilitating early treatment and monitoring of the disease. For therapeutic applications, new drug delivery nanosystems aiming to provide enhanced efficiency have been proposed often addressing selective or controlled delivery of therapeutic agents to particular cells to maximize treatment efficacy minimizing adverse effects. Read More

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January 2019

Self-faceting of emulsion droplets as a route to solid icosahedra and other polyhedra.

J Colloid Interface Sci 2018 Dec 2;538:541-545. Epub 2018 Dec 2.

Department of Physics, Bar-Ilan University, Ramat-Gan 5290002, Israel; Bar-Ilan Institute of Nanotechnology and Advanced Materials, Bar-Ilan University, Ramat-Gan 5290002, Israel. Electronic address:

Hypothesis: Temperature-controlled self-faceting of liquid droplets has been recently discovered in surfactant-stabilized alkane-in-water emulsions. We hypothesize that similar self-faceting may occur in emulsion droplets of UV-polymerizable linear hydrocarbons. We further hypothesize that the faceted droplet shapes can be fixed by UV-initiated polymerization, thus providing a new route towards the production of solid polyhedra. Read More

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December 2018

High-Performance Synthesis of Phosphorus-Doped Graphene Materials and Stabilization of Phosphoric Micro- and Nanodroplets.

Langmuir 2018 Dec 14. Epub 2018 Dec 14.

Zelinsky Institute of Organic Chemistry , Russian Academy of Sciences , Leninsky Prospekt, 47 , Moscow 119991 , Russia.

A thermally induced cascade process leading to the formation of stable micro- and nanometer-size phosphoric droplets was developed starting from a molecular precursor. Microwave-induced pyrolysis of 1,2,3,4,5-pentaphenylphosphole oxide proceeded through a series of subsequent transformations involving formation of phosphorus-doped graphene oxide layers, seeding of carbon surface with phosphorus centers, and assembling of stable droplets. A complex nanostructured organization of the material was established in a remarkably short time of 3 min, and the process was performed in a thermally induced manner using microwave irradiation. Read More

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December 2018

Bacterial Resistance and Prostate Cancer Susceptibility Toward Metal-Ion-doped DNA Complexes.

ACS Appl Mater Interfaces 2018 Dec 14. Epub 2018 Dec 14.

Sungkyunkwan Advanced Institute of Nanotechnology (SAINT) and Department of Physics , Sungkyunkwan University , Suwon 16419 , Korea.

DNA nanotechnology has laid a platform to construct a variety of custom-shaped nanoscale objects for functionalization of specific target materials to achieve programmability and molecular recognition. Herein, we prepared DNA nanostructures [namely, synthetic DNA rings (RDNA) and DNA duplexes extracted from salmon (SDNA)] containing metal ions (M) such as Cu, Ni, and Zn as payloads for delivery to exterminate highly pathologic hospital bacterial strains (e.g. Read More

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December 2018
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Dual Therapy Coating on Micro/Nanoscale Porous Polyetheretherketone to Eradicate Biofilms and Accelerate Bone Tissue Repair.

Macromol Biosci 2018 Dec 14:e1800376. Epub 2018 Dec 14.

School of Chemical Engineering, Sichuan University, Chengdu, 610065, China.

Defective osteogenesis and latent infections continue to be two major issues in the therapy of bone tissue regeneration. In this study, a unique hierarchically micro/nanoscale-architecture is first proposed and produced on polyetheretherketone (PEEK). Besides, a "simvastatin-PLLA film-tobramycin microspheres" delivery system is subsequently fabricated to endow the PEEK implant with osteogenic and antibacterial capabilities. Read More

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December 2018

A Magnetic Gated Nanofluidic Based on the Integration of a Superhydrophilic Nanochannels and Reconfigurable Ferrofluid.

Adv Mater 2018 Dec 14:e1805953. Epub 2018 Dec 14.

University of Chinese Academy of Sciences, Beijing, 100049, P. R. China.

The design of intelligent gating in nanoscale is the subject of intense research motivated by a broad potential impact on science and technology. However, the existing designs require complex modification and are unstable, which restrict their practical applications. Here, a magnetic gated nanofluidic is reported based on the integration of superhydrophilic membranes and reconfigurable ferrofluid, which realizes the gating of the nanochannel by adjusting the steric configuration of the ferrofluid. Read More

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December 2018

3D mapping of gas physisorption for the spatial characterisation of nanoporous materials.

Chemphyschem 2018 Dec 13. Epub 2018 Dec 13.

Imperial College London, Chemical Engineering, South Kensington Campus, ACEX415, SW72AZ, London, UNITED KINGDOM.

Nanoporous materials used in industrial applications (e.g., catalysis and separations) draw their functionality from properties at the nanoscale (1 - 10 Å). Read More

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December 2018

Atypical Film-Forming Behavior of Soluble Tetra-3-Nitro-Substituted Copper Phthalocyanine.

Chemphyschem 2018 Dec 12. Epub 2018 Dec 12.

Institute of Solution Chemistry Russian Academy of Sciences, I-8, Akademicheskaya Str., 1, 153045, Ivanovo, RUSSIAN FEDERATION.

Thin films of metal phthalocyanines (MPc) are known to exhibit excellent physical properties but poorly controlled morphologies. Therefore, the present work seeks to understand the film growth mechanism of a model compound for potentially usable MPc, specifically, copper tetra(3-nitro-5-tert-butyl)phthalocyanine (CuPc*). The Langmuir-Schaefer (LS) technique was applied to prepare a series of CuPc* films under different processing conditions. Read More

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December 2018

High-speed imaging and tracking of very small single nanoparticles by contrast enhanced microscopy.

Nanoscale 2018 Dec 14. Epub 2018 Dec 14.

Institute of Atomic and Molecular Sciences (IAMS), Academia Sinica, 10617 Taipei, Taiwan.

Nanoparticles have been used extensively in biology-related research and many applications require direct visualization of individual nanoparticles by optical microscopy. For long-term and high-speed measurements, scattering-based microscopy is a unique technique because of the stable and indefinite scattering signals. In scattering-based single-particle measurements, large nanoparticles are usually needed in order to generate sufficient signals for detection. Read More

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December 2018

Inscribing diffraction gratings in bulk silicon with nanosecond laser pulses.

Opt Lett 2018 Dec;43(24):6069-6072

Diffraction gratings are transversally inscribed in the bulk of monolithic crystalline silicon with infrared nanosecond laser pulses. Nanoscale material analyses of the modifications composing the gratings show that they rely on laser-induced stress associated with a positive refractive index change as confirmed with phase-shift interferometry. Characterizations of the optical properties of the gratings, including the diffraction angles and the efficiency of the different orders, are carried out. Read More

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December 2018

Advanced applications of nanotechnology in veterinary medicine.

Environ Sci Pollut Res Int 2018 Dec 13. Epub 2018 Dec 13.

Faculty of Veterinary Medicine, Department of Medicine and Infectious Diseases, Cairo University, Giza, Egypt.

The invention of new techniques to manipulate materials at their nanoscale had an evolutionary effect on various medical sciences. At the time, there are thousands of nanomaterials which can be divided according to their shape, origin, or their application. The nanotechnology provided new solutions for old problems. Read More

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December 2018
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Optimizing the removal of nitrate from aqueous solutions via reduced graphite oxide-supported nZVI: synthesis, characterization, kinetics, and reduction mechanism.

Environ Sci Pollut Res Int 2018 Dec 13. Epub 2018 Dec 13.

Department of Civil and Environment Engineering, The Hong Kong Polytechnic University, Hong Kong, People's Republic of China.

Graphene has been considered an ideal absorbent and excellent carrier for nanoparticles. Reduced graphite oxide (rGO)-supported nanoscale zero-valent iron (nZVI@rGO) is an effective material for removing nitrate from water. nZVI@rGO nanocomposites were prepared by a liquid-phase reduction method and then applied for nitrate-nitrogen (NO-N) removal in aqueous solution under anaerobic conditions. Read More

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December 2018

Ternary nanocomposites of reduced graphene oxide, polyaniline and hexaniobate: hierarchical architecture and high polaron formation.

Beilstein J Nanotechnol 2018 26;9:2936-2946. Epub 2018 Nov 26.

School of Materials and National Graphene Institute, The University of Manchester, Booth St E, Manchester M13 9PL, United Kingdom.

Nanostructured systems, such as nanocomposites, are potential materials for usage in different fields since synergistic effects of their components at the nanoscale domain may improve physical/chemical properties when compared to individual phases. We report here the preparation and characterisation of a new nanocomposite composed of polyaniline (PANI), reduced graphene oxide (rGO) and hexaniobate (hexNb) nanoscrolls. Atomic force microscopy images show an interesting architecture of rGO flakes coated with PANI and decorated by hexNb. Read More

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November 2018

In situ characterization of nanoscale contaminations adsorbed in air using atomic force microscopy.

Beilstein J Nanotechnol 2018 23;9:2925-2935. Epub 2018 Nov 23.

Centro de Investigación en Óptica y Nanofísica (CIOyN), Departamento Física, Facultad de Química, Campus Espinardo, Universidad de Murcia, 30100 Murcia, Spain.

Under ambient conditions, surfaces are rapidly modified and contaminated by absorbance of molecules and a variety of nanoparticles that drastically change their chemical and physical properties. The atomic force microscope tip-sample system can be considered a model system for investigating a variety of nanoscale phenomena. In the present work we use atomic force microscopy to directly image nanoscale contamination on surfaces, and to characterize this contamination by using multidimensional spectroscopy techniques. Read More

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November 2018

Time-resolved universal temperature measurements using NaYF:Er,Yb upconverting nanoparticles in an electrospray jet.

Beilstein J Nanotechnol 2018 21;9:2916-2924. Epub 2018 Nov 21.

Department of Chemistry and Biochemistry, Ohio University, Athens, Ohio 45701, USA.

Hexagonal upconverting nanoparticles (UCNPs) of NaYF:Er,Yb (ca. 300 nm) have been widely used to measure the temperature at the nanoscale using luminescence ratio thermometry. However, several factors limit their applications. Read More

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November 2018

Mesoporous silica-based nanoplatforms for the delivery of photodynamic therapy agents.

J Pharm Investig 2018 9;48(1):3-17. Epub 2017 Sep 9.

Biomarker Branch, National Cancer Center, 323 Ilsan-ro, Goyang-si, Gyeonggi-do 10408 Republic of Korea.

Photodynamic therapy (PDT) is an established method for the treatment of cancer which utilizes light, a photosensitizer (PS), and oxygen. Unfavourable characteristics of most PSs, such as low solubility and tumour specificity have led many researchers to adopt nanoscale drug delivery platforms for use in PDT. Mesoporous silica nanoparticles (MSNs) form a significant part of that effort, due to their ease and controllability of synthesis, ease of loading, availability of diverse surface functionalization, and biocompatibility. Read More

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September 2017

3D nanofabrication by volumetric deposition and controlled shrinkage of patterned scaffolds.

Science 2018 Dec;362(6420):1281-1285

MIT Media Lab, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.

Lithographic nanofabrication is often limited to successive fabrication of two-dimensional (2D) layers. We present a strategy for the direct assembly of 3D nanomaterials consisting of metals, semiconductors, and biomolecules arranged in virtually any 3D geometry. We used hydrogels as scaffolds for volumetric deposition of materials at defined points in space. Read More

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December 2018
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DNA-Based Super-Resolution Microscopy: DNA-PAINT.

Genes (Basel) 2018 Dec 11;9(12). Epub 2018 Dec 11.

School of Biotechnology and Biomolecular Science, University of New South Wales, Sydney, NSW 2052, Australia.

Super-resolution microscopies, such as single molecule localization microscopy (SMLM), allow the visualization of biomolecules at the nanoscale. The requirement to observe molecules multiple times during an acquisition has pushed the field to explore methods that allow the binding of a fluorophore to a target. This binding is then used to build an image via points accumulation for imaging nanoscale topography (PAINT), which relies on the stochastic binding of a fluorescent ligand instead of the stochastic photo-activation of a permanently bound fluorophore. Read More

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December 2018

Nanoscale Ring-Shaped Conduction Channels with Memristive Behavior in BiFeO₃ Nanodots.

Nanomaterials (Basel) 2018 Dec 11;8(12). Epub 2018 Dec 11.

Guangdong Provincial Key Laboratory of Optical Information Materials and Technology, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, China.

Nanoscale ring-shaped conduction channels with memristive behavior have been observed in the BiFeO₃ (BFO) nanodots prepared by the ion beam etching. At the hillside of each individual nanodot, a ring-shaped conduction channel is formed. Furthermore, the conduction channels exhibit memristive behavior, i. Read More

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December 2018

Overview of DNA Self-Assembling: Progresses in Biomedical Applications.

Pharmaceutics 2018 Dec 11;10(4). Epub 2018 Dec 11.

Institute for Advanced Chemistry of Catalonia (IQAC-CSIC), Networking Center on Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Jordi Girona 18-26, E-08034 Barcelona, Spain.

Molecular self-assembling is ubiquitous in nature providing structural and functional machinery for the cells. In recent decades, material science has been inspired by the nature's assembly principles to create artificially higher-order structures customized with therapeutic and targeting molecules, organic and inorganic fluorescent probes that have opened new perspectives for biomedical applications. Among these novel man-made materials, DNA nanostructures hold great promise for the modular assembly of biocompatible molecules at the nanoscale of multiple shapes and sizes, designed via molecular programming languages. Read More

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December 2018

Inhibitory Effect of Naphthoquinone-Tryptophan Hybrid towards Aggregation of PAP f39 Semen Amyloid.

Molecules 2018 Dec 11;23(12). Epub 2018 Dec 11.

School of Molecular Microbiology & Biotechnology, Tel Aviv University, Tel Aviv 69978, Israel.

PAP, a 39 amino acid peptide fragment, derived from the prostatic acid phosphatase secreted in human semen, forms amyloid fibrils and facilitates the attachment of retroviruses to host cells that results in the enhancement of viral infection. Therefore, the inhibition of amyloid formation by PAP (termed PAP f39) may likely reduce HIV transmission in AIDS. In this study, we show that the naphthoquinone tryptophan (NQTrp) hybrid molecule significantly inhibited PAP f39 aggregation in vitro in a dose-dependent manner as observed from the ThT assay, ANS assay, and transmission electron microscopy imaging. Read More

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December 2018

A Novel Class of Injectable Bioceramics that Glue Tissues and Biomaterials.

Materials (Basel) 2018 Dec 7;11(12). Epub 2018 Dec 7.

Applied material science, Department of Engineering, Uppsala University, Uppsala 75121, Sweden.

Calcium phosphate cements (CPCs) are clinically effective void fillers that are capable of bridging calcified tissue defects and facilitating regeneration. However, CPCs are completely synthetic/inorganic, unlike the calcium phosphate that is found in calcified tissues, and they lack an architectural organization, controlled assembly mechanisms, and have moderate biomechanical strength, which limits their clinical effectiveness. Herein, we describe a new class of bioinspired CPCs that can glue tissues together and bond tissues to metallic and polymeric biomaterials. Read More

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December 2018
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A dirty story: Improving colloidal monolayer formation by understanding the effect of impurities at the air/water interface.

Langmuir 2018 Dec 13. Epub 2018 Dec 13.

Colloidal monolayers are important tools to fabricate surface structures at the nanoscale. A typical monolayer fabrication strategy involves the self-assembly of colloidal building blocks at liquid interfaces, which are subsequently deposited on a solid substrate. Even though this process is well established, the resulting order of the particles within the colloidal monolayer differs between batches of colloidal particles and can even change with the age of the dispersion. Read More

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December 2018

Nanoscale Core-Shell Hyperbolic Structures for Ultralow Threshold Laser Action: An Efficient Platform for the Enhancement of Optical Manipulation.

ACS Appl Mater Interfaces 2018 Dec 13. Epub 2018 Dec 13.

Plasmonic material has been emerged with multi-functionalities for its remarkable tailoring light emission, reshaping density of states (DOS) and focusing subwavelength light. However, restricted by its propagation loss and narrowband resonance in nature, it is a challenge issue for plasmonic material to provide a broadband DOS to advance its application. Here, we develop a novel nanoscale core-shell hyperbolic structure that possesses a remarkably coupling effect inside the multishell nanoscale composite owing to a higher DOS and longer time of collective oscillations of the electrons than the plasmonic-based pure metal nanoparticles. Read More

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December 2018

The Middle Road Less Taken: Electronic-Structure-Inspired Design of Hybrid Photocatalytic Platforms for Solar Fuel Generation.

Acc Chem Res 2018 Dec 13. Epub 2018 Dec 13.

Departments of Chemistry and Materials Science and Engineering , Texas A&M University , College Station , Texas 77842-3012 , United States.

The development of efficient solar energy conversion to augment other renewable energy approaches is one of the grand challenges of our time. Water splitting, or the disproportionation of HO into energy-dense fuels, H and O, is undoubtedly a promising strategy. Solar water splitting involves the concerted transfer of four electrons and four protons, which requires the synergistic operation of solar light harvesting, charge separation, mass and charge transport, and redox catalysis processes. Read More

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December 2018

Surface-controlled water flow in nanotube membranes.

ACS Appl Mater Interfaces 2018 Dec 13. Epub 2018 Dec 13.

The independent effect of nanotube surface chemistry and structure on the flow of water under nanoscale confinement is demonstrated in this paper for the first time via the synthesis of novel carbon nitride nanotube (CNNT) membranes. Using a combination of experiments and high-fidelity molecular dynamics (MD) simulations, it is here shown that the hydrophilisation of the sp2 carbon structure, induced by the presence of the C-N bonds, decreases the pure water permeance in CNNTs when compared with pristine and turbostratic carbon nanotubes (CNTs). The MD simulations are based on a model true to the chemical structure of the synthesized nanotubes, and built from spectroscopy measurements and calibrated potentials using droplet experiments. Read More

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December 2018

Intracellular targeted delivery of quantum dots with extraordinary performance enabled by a novel nanomaterial design.

Nanoscale 2018 Dec 13. Epub 2018 Dec 13.

Department of Biomedical Engineering, College of Engineering and Applied Sciences, Nanjing University, China. and Institute of Materials Engineering, College of Engineering and Applied Sciences, Nanjing University, China and Collaborative Innovation Center of Chemistry for Life Sciences, Nanjing University, China.

Quantum dots (QDs) have emerged as a major class of fluorescent probes with unique optical properties, but applying QDs for imaging specific intracellular entities in live cells has been hindered by the poor performance of targeted intracellular delivery of QDs due to various cellular transport barriers. We describe a novel QD nanoprobe design, which is termed a cosolvent-bare hydrophobic QD-biomolecule (cS-bQD-BM, or 'SDot' for short), combining a cosolvent, a bare hydrophobic nanoparticle surface, ultrasmall size and biomolecular function. SDots show extraordinary intracellular targeting performance with the nucleus as the model target, including near-perfect specificity, excellent efficiency and reproducibility, high-throughput ability, minimal toxicity, and ease of operation, as well as superb optical properties and colloidal stability. Read More

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December 2018

Practical use of polymer brushes in sustainable energy applications: interfacial nanoarchitectonics for high-efficiency devices.

Chem Soc Rev 2018 Dec 13. Epub 2018 Dec 13.

Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, CONICET, Diagonal 113 y 64 (1900), La Plata, Argentina.

The discovery and development of novel approaches, materials and manufacturing processes in the field of energy are compelling increasing recognition as a major challenge for contemporary societies. The performance and lifetime of energy devices are critically dependent on nanoscale interfacial phenomena. From the viewpoint of materials design, the improvement of current technologies inevitably relies on gaining control over the complex interface between dissimilar materials. Read More

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December 2018

Bio-interfactants as double-sided tapes for graphene oxide.

Nanoscale 2018 Dec 13. Epub 2018 Dec 13.

University of Bremen, Hybrid Materials Interfaces Group, Faculty of Production Engineering, Center for Environmental Research and Sustainable Technology (UFT), and MAPEX Center for Materials and Processes, D-28359 Bremen, Germany.

We present a versatile and highly substrate-independent approach for preparing multisandwich layers based on thermally reduced Graphene Oxide (rGO) which gets strongly attached by bio-interfactants using a layer-by-layer (LBL) aqueous dipping and rinsing process. The process allows for the deposition of homogeneous ultra-thin films (∼5.5 nm) in distinct surface topographies, thicknesses and compositions by varying the bio-interfactant layer(s). Read More

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December 2018
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Strain rate dependent nanostructure of hydrogels with reversible hydrophobic associations during uniaxial extension.

Soft Matter 2018 Dec 13. Epub 2018 Dec 13.

Department of Polymer Engineering, University of Akron, Akron, OH 44325, USA.

An energy dissipation mechanism during deformation is required to impart toughness to hydrogels. Here we describe how in situ small angle X-ray scattering (SAXS) provides insight into possible energy dissipation mechanisms for a tough hydrogel based on an amphiphilic copolymer where nanoscale associations of the hydrophobic moieties act as effective crosslinks. The mechanical properties of the hydrogels are intimately coupled with the nanostructure that provides reversible crosslinks and evolves during deformation. Read More

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December 2018

A liquid metal-based self-adaptive sulfur-gallium composite for long-cycling lithium-sulfur batteries.

Nanoscale 2018 Dec 13. Epub 2018 Dec 13.

Key Laboratory of Aerospace Advanced Materials and Performance of Ministry of Education, School of Materials Science & Engineering Beihang University, Beijing, 100191, China.

Lithium-sulfur (Li-S) batteries have been regarded as a promising candidate for energy storage owing to their ultrahigh theoretical capacity and low cost. However, the commercial application of Li-S batteries has been plagued by the huge volume change of sulfur, the insulative nature of solid active materials (S and Li2S) and the polysulfide shuttle. Here, a uniform sulfur-gallium core-shell structure (S@Ga) with an ultrathin liquid gallium shell was prepared by harnessing the reaction between sulfur and gallium via a facile mixing process. Read More

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December 2018

Inside back cover.

Authors:

Nanoscale 2018 Dec;10(48):23201

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December 2018

Enhancing charge transfer with foreign molecules through femtosecond laser induced MoS defect sites for photoluminescence control and SERS enhancement.

Nanoscale 2018 Dec 13. Epub 2018 Dec 13.

Department of Electrical and Computer Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588-0511, USA.

Defect/active site control is crucial for tuning the chemical, optical, and electronic properties of MoS2, which can adjust the performance of MoS2 in application areas such as electronics, optics, catalysis, and molecular sensing. This study presents an effective method of inducing defect/active sites, including micro/nanofractured structures and S atomic vacancies, on monolayer MoS2 flakes by using femtosecond laser pulses, through which physical-chemical adsorption and charge transfer between foreign molecules (O2 or R6G molecules) and MoS2 are enhanced. The enhanced charge transfer between foreign molecules (O2 or R6G) and femtosecond laser-treated MoS2 can enhance the electronic doping effect between them, hence resulting in a photoluminescence photon energy shift (reaching 0. Read More

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December 2018

Back cover.

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Nanoscale 2018 Dec;10(48):23202

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December 2018
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High-performance sub-10 nm monolayer BiOSe transistors.

Nanoscale 2018 Dec 13. Epub 2018 Dec 13.

State Key Laboratory for Mesoscopic Physics and Department of Physics, Peking University, Beijing 100871, P. R. China. and Collaborative Innovation Center of Quantum Matter, Beijing 100871, P. R. China.

A successful two-dimensional (2D) semiconductor successor of silicon for high-performance logic in the post-silicon era should have both excellent performance and air stability. However, air-stable 2D semiconductors with high performance were quite elusive until the air-stable Bi2O2Se with high electron mobility was fabricated very recently (J. Wu, H. Read More

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December 2018

Modulated interlayer charge transfer dynamics in a monolayer TMD/metal junction.

Nanoscale 2018 Dec 13. Epub 2018 Dec 13.

Research School of Engineering, College of Engineering and Computer Science, the Australian National University, Canberra, ACT 2601, Australia.

The performance of optoelectronic devices based on monolayer transition-metal dichalcogenide (mTMD) semiconductors is significantly affected by the contact at the mTMD-metal interface, which is dependent on interlayer interactions and coupling. Here, we report a systematic optical method to investigate the interlayer charge transfer and coupling in a mTMD-metal heterojunction. Giant photoluminescence (PL) quenching was observed in a monolayer MoS2/Pd (1L MoS2/Pd) junction which is mainly due to the efficient interlayer charge transfer between Pd and MoS2. Read More

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December 2018

Surface versus solution chemistry: manipulating nanoparticle shape and composition through metal-thiolate interactions.

Nanoscale 2018 Dec 13. Epub 2018 Dec 13.

Indiana University, Department of Chemistry, 800 E. Kirkwood Ave., Bloomington, IN 47405, USA.

Nanostructures with well-defined crystallite sizes, shapes, and compositions are finding use in areas such as energy, security, and even medicine. Seeded growth is a promising strategy to achieve shape-controlled nanostructures, where specific structural features are often directed by the underlying symmetry of the seeds. Here, thiophenol derivatives capable of different metal-thiolate interactions were introduced into the synthesis of Au/Pd nanostructures by seed-mediated co-reduction. Read More

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December 2018
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[Tc-HYNIC-N-dodecylamide]: a new hydrophobic tracer for labelling reconstituted high-density lipoproteins (rHDL) for radioimaging.

Nanoscale 2018 Dec 13. Epub 2018 Dec 13.

Dept. of Physiology and Anatomy, University of North Texas Health Science Center, Fort Worth, TX 76107, USA.

Despite the widespread use of nanotechnology in radio-imaging applications, lipoprotein based delivery systems have received only limited attention so far. These studies involve the synthesis of a novel hydrophobic radio-imaging tracer consisting of a hydrazinonicotinic acid (HYNIC)-N-dodecylamide and 99mTc conjugate that can be encapsulated into rHDL nanoparticles (NPs). These rHDL NPs can selectively target the Scavenger Receptor type B1 (SR-B1) that is overexpressed on most cancer cells due to excess demand for cholesterol for membrane biogenesis and thus can target tumors in vivo. Read More

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December 2018

A self-assembly study of PNA-porphyrin and PNA-BODIPY hybrids in mixed solvent systems.

Nanoscale 2018 Dec 13. Epub 2018 Dec 13.

Department of Chemistry, University of Crete, Laboratory of Bioinorganic Chemistry, Voutes Campus, 70013 Heraklion, Crete, Greece.

In this work a peptide nucleic acid (PNA) was covalently connected with two different chromophores, namely porphyrin and boron-dipyrromethene. To the best of our knowledge, this is the first example in the literature where a PNA unit is covalently linked to such chromophores. The self-assembly properties of the hybrids were examined through electron microscopy experiments by adopting the "good-bad" solvent self-assembly protocol. Read More

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December 2018

High-performance gas sensors based on single-wall carbon nanotube random networks for the detection of nitric oxide down to the ppb-level.

Nanoscale 2018 Dec 13. Epub 2018 Dec 13.

Department of Electronic Materials Engineering, Kwangwoon University, Seoul 139-701, Republic of Korea.

We demonstrate highly sensitive and selective gas sensors based on solution-processed single-wall carbon nanotube (SWCNT) random networks for the detection of nitric oxide (NO) down to the ppb-level operating at room temperature. The proposed gas sensors exhibited a response of 50% under both inert and air atmospheres with a theoretical detection limit of 0.2 ppb and a selectivity toward different target gases of volatile organic compounds, including benzene, toluene, and ammonia. Read More

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December 2018
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Strain in a single wrinkle on an MoS flake for in-plane realignment of band structure for enhanced photo-response.

Nanoscale 2018 Dec 13. Epub 2018 Dec 13.

Department of Chemical Engineering, University of Illinois at Chicago, 810 South Clinton Street, Chicago, Illinois 60607, USA.

Since 2D transition metal dichalcogenides (TMDs) exhibit strain-tunable bandgaps, locally confining strain can allow lateral manipulation of their band structure, in-plane carrier transport and optical transitions. Herein, we show that a single wrinkle (width = 10 nm-10 μm) on an MoS2 flake can induce confined uniaxial strain to reduce the local bandgap (40-60 meV per % deformation), producing a microscopic exciton funnel with an enhancement in photocurrent over flat MoS2 devices. This study also shows that wrinkles can spatially reconfigure the distribution of dopants and enhance the light absorption in the MoS2 layer via Fabry-Perot interference in its nanocavity. Read More

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December 2018
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Rational design of ordered Pd-Pb nanocubes as highly active, selective and durable catalysts for solvent-free benzyl alcohol oxidation.

Nanoscale 2018 Dec 13. Epub 2018 Dec 13.

Department of Physics and Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education, Hubei Nuclear Solid Physics Key Laboratory, Wuhan University, Wuhan 430072, China.

The selective oxidation of alcohols is an important chemical process with many potential applications in fine-chemical synthesis, however, the catalysts reported so far generally suffer from low activity and poor selectivity. We present here a class of ordered Pd3Pb nanocubes (NCs) with an intermetallic phase and well-defined surface as unique catalysts for selective oxidation of benzyl alcohol to benzaldehyde. The optimized Pd3Pb NCs exhibit both enhanced activity with the turnover frequency of 191 000 h-1 and excellent selectivity up to 91. Read More

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December 2018
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Understanding the formation of ultrathin mesoporous LiTiO nanosheets and their application in high-rate, long-life lithium-ion anodes.

Nanoscale 2018 Dec 13. Epub 2018 Dec 13.

Department of NanoEngineering, University of California San Diego, La Jolla, CA 92093, USA and Program of Materials Science and Engineering, University of California San Diego, La Jolla, CA 92093, USA.

Two-dimensional nanosheet-like materials with ultra-small thickness and uniform porous structures hold great promise for high-rate and long-life lithium-ion batteries. In this work, pure ultrathin mesoporous Li4Ti5O12 nanosheets are fabricated by combining a facile solvothermal synthesis with a calcination process. The detailed formation mechanism of ultrathin mesoporous Li4Ti5O12 nanosheets is systematically investigated, which identified the key factors that control the structure development. Read More

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December 2018
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Motion recognition by a liquid filled tubular triboelectric nanogenerator.

Nanoscale 2018 Dec 13. Epub 2018 Dec 13.

CAS Center for Excellence in Nanoscience, Beijing Key Laboratory of Micro-Nano Energy and Sensor, Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing 100083, P. R. China. and School of Nanoscience and Technology, University of Chinese Academy of Sciences, Beijing 100049, P. R. China and School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245, USA.

The development of flexible electronics has extended the limit of the intelligent devices, which are highly sensitive, soft and capable of sustaining arbitrary deformation. Here, we report a liquid-polymer tubular triboelectric nanogenerator (L-P TENG) that is filled with liquid for a shape-adaptive sensor in various working modes. The L-P TENG is based on liquid-solid contact electrification with the use of displacement current and excited by the shape change of the tubular structure. Read More

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December 2018
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A label-free aptamer-based nanogap capacitive biosensor with greatly diminished electrode polarization effects.

Phys Chem Chem Phys 2018 Dec 13. Epub 2018 Dec 13.

School of Mathematics and Physical Sciences, University of Hull, Hull, HU6 7RX, UK. and George W Gray Centre for Advanced Materials, University of Hull, Hull, HU6 7RX, UK.

A significant impediment to the use of impedance spectroscopy in bio-sensing is the electrode polarization effect that arises from the movement of free ions to the electrode-solution interface, forming an electrical double layer (EDL). The EDL screens the dielectric response of the bulk and its large capacitance dominates the signal response at low frequency, masking information particularly relevant for biological samples, such as molecular conformation changes and DNA hybridization. The fabrication of nanogap capacitors with electrode separation less than the EDL thickness can significantly reduce electrode polarization effects and provide enormous improvement in sensitivity due to better matching of the sensing volume with the size of the target entities. Read More

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December 2018

Back cover.

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Nanoscale 2018 Dec 13;10(48):23202. Epub 2018 Dec 13.

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December 2018

Inside back cover.

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Nanoscale 2018 Dec 13;10(48):23201. Epub 2018 Dec 13.

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December 2018

Printing Birefringent Figures by Surface Tension-Directed Self-Assembly of a Cellulose Nanocrystal/Polymer Ink Components.

ACS Appl Mater Interfaces 2018 Dec 13. Epub 2018 Dec 13.

Photonic printing on transparent substrates using emerging synthetic photonic crystals is in high demand, especially for anti-fraud applications. However, photonic printing is faced with grand challenges including nonzero initial contrast, contrast hysteresis after stimuli removal and lack of the long-lasting stability. Natural anisotropic crystal structures and artificially molecularly arranged polymers show an optically anisotropic property known as birefringence. Read More

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December 2018

Strain Tunable Bandgap and High Carrier Mobility in SiAs and SiAs Monolayers from First-Principles Studies.

Nanoscale Res Lett 2018 Dec 12;13(1):404. Epub 2018 Dec 12.

International Laboratory for Quantum Functional Materials of Henan, Zhengzhou University, Zhengzhou, 450001, People's Republic of China.

Searching for new stable free-standing atomically thin two-dimensional (2D) materials is of great interest in the fundamental and practical aspects of contemporary material sciences. Recently, the synthesis of layered SiAs single crystals has been realized, which indicates that their few layer structure can be mechanically exfoliated. Performing a first-principles density functional theory calculations, we proposed two dynamically and thermodynamically stable semiconducting SiAs and SiAs monolayers. Read More

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December 2018

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Nanoscale 2018 Dec;10(48):22641-22656

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December 2018