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New trimethyl chitosan-based composite nanoparticles as promising antibacterial agents

Ibrahim M. El‐Sherbiny、Ehab Salih、Fikry M. Reicha2015-08-12Drug Development and Industrial Pharmacy

In the present study, densely dispersed silver nanoparticles (Ag NPs) were rapidly green synthesized in the presence of Rumex dentatus aqueous extract, followed by UV-irradiation reduction. The Ag NPs were characterized using UV-vis spectroscopy, FTIR, XRD, and TEM. Then, the Ag NPs were incorporated into interpenetra…

Nanoparticles: synthesis and applicationsNanocomposite Films for Food PackagingAdvanced Nanomaterials in Catalysis

Imaging of carbon nanomembranes with helium ion microscopy

André Beyer、Henning Vieker、Robin Klett 等 6 位作者2015-08-12Beilstein Journal of Nanotechnology

Carbon nanomembranes (CNMs) prepared from aromatic self-assembled monolayers constitute a recently developed class of 2D materials. They are made by a combination of self-assembly, radiation-induced cross-linking and the detachment of the cross-linked SAM from its substrate. CNMs can be deposited on arbitrary substrat…

Carbon Nanotubes in CompositesGraphene research and applicationsQuantum and electron transport phenomena

Imaging nano-objects by linear and nonlinear optical absorption microscopies

Mary Sajini Devadas、Tuphan Devkota、Paul Johns 等 8 位作者2015-08-12Nanotechnology

Absorption based microscopy measurements are emerging as important tools for studying nanomaterials. This review discusses the three most common techniques for performing these experiments: transient absorption microscopy, photothermal heterodyne imaging, and spatial modulation spectroscopy. The focus is on the applic…

Gold and Silver Nanoparticles Synthesis and ApplicationsAdvanced Fluorescence Microscopy TechniquesSpectroscopy Techniques in Biomedical and Chemical Research

Ultrathin planar chiral metasurface for controlling gradient phase discontinuities of circularly polarized waves

Yahong Liu、Xin Zhou、Kun Song 等 5 位作者2015-08-12Journal of Physics D Applied Physics

We develop a gradient phase discontinuities ultrathin planar metasurface based on chiral branched gammadion structure (CBGS) that provides extreme control of electromagnetic wavefronts across single-sheet design. The introduction of the branch can provide antiparallel magnetic moment, which tunes the chirality of the…

Antenna Design and AnalysisMetamaterials and Metasurfaces ApplicationsAdvanced Antenna and Metasurface Technologies

Suppression of Nonmagnetic Insulating State by Application of Pressure in Mineral Tetrahedrite Cu12Sb4S13

Shunsaku Kitagawa、Taishi Sekiya、Shingo Araki 等 10 位作者2015-08-12Journal of the Physical Society of Japan

The mineral tetrahedrite Cu$_{12}$Sb$_{4}$S$_{13}$ exhibits a first-order metal--insulator transition (MIT) at $T_{\rm MI}$ = 85 K and ambient pressure. We measured the $^{63}$Cu-NMR at ambient pressure and the resistivity and magnetic susceptibility at high pressures. $^{63}$Cu-NMR results indicate a nonmagnetic insu…

Advanced Thermoelectric Materials and DevicesMagnetic and transport properties of perovskites and related materialsAdvanced Condensed Matter Physics

Spin Isomers and Ligand Isomerization in a Three-Coordinate Cobalt(I) Carbonyl Complex

Malik H. Al‐Afyouni、Elizaveta A. Suturina、Shubhrodeep Pathak 等 9 位作者2015-08-12Journal of the American Chemical Society

Hemilabile ligands, which have one donor that can reversibly bind to a metal, are widely used in transition-metal catalysts to create open coordination sites. This change in coordination at the metal can also cause spin-state changes. Here, we explore a cobalt(I) system that is poised on the brink of hemilability and…

Organometallic Complex Synthesis and CatalysisMagnetism in coordination complexesMetal-Catalyzed Oxygenation Mechanisms

Controlling Short-Range Interactions by Tuning Surface Chemistry in HDPE/Graphene Nanoribbon Nanocomposites

Soheil Sadeghi、Alireza Zehtab Yazdi、Uttandaraman Sundararaj2015-08-12The Journal of Physical Chemistry B

Unique dispersion states of nanoparticles in polymeric matrices have the potential to create composites with enhanced mechanical, thermal, and electrical properties. The present work aims to determine the state of dispersion from the melt-state rheological behavior of nanocomposites based on carbon nanotube and graphe…

Carbon Nanotubes in CompositesPolymer crystallization and propertiesPolymer Nanocomposites and Properties

In vitro and in vivo corrosion of the novel magnesium alloy Mg–La–Nd–Zr: influence of the measurement technique and in vivo implant location

Janin Reifenrath、A-K Marten、Nina Angrisani 等 5 位作者2015-08-12Biomedical Materials

For the evaluation of new magnesium-based alloys, many different in vitro and in vivo methods are used. It was the aim of the current study to perform in vitro and in vivo corrosion studies of the new alloy Mg-La-Nd-Zr for its evaluation as a promising new degradable material and to compare commonly used evaluation me…

Corrosion Behavior and InhibitionMagnesium Alloys: Properties and ApplicationsHydrogen Storage and Materials

A Renewable Display Platform Based on the Bipolar Electrochromic Electrode

Xiaowei Zhang、Changshuai Shang、Wenlin Gu 等 6 位作者2015-08-12ChemElectroChem

Abstract We report a renewable display platform based on bipolar electrochemistry that uses bipolar electrochromic electrode (BP‐EC‐E) arrays for high‐throughput screening applications. Prussian blue (or another electrochromic material) is electrodeposited on one end of the bipolar electrode (BPE) as the signal report…

Gas Sensing Nanomaterials and SensorsTransition Metal Oxide NanomaterialsAnalytical Chemistry and Sensors

In vitro corrosion behavior of Mg‐5Zn alloy containing low Y contents

Hassan Jafari、Farhad Rahimi、Z. Sheikhsofla2015-08-12Materials and Corrosion

This study mainly investigated the impact of small amounts of yttrium (Y: 0.1–1.5 wt%) on in vitro corrosion behavior of Mg‐5Zn bioimplant alloy in simulated body fluid. Optical and scanning electron microcopies, energy dispersive X‐ray spectroscopy and X‐ray diffraction analysis were used to assess the microstructure…

Magnesium Alloys: Properties and ApplicationsAluminum Alloys Composites PropertiesHydrogen Storage and Materials

Microwave-assisted low temperature fabrication of ZnO thin film electrodes for solar energy harvesting

T. A. Nirmal Peiris、Jagdeep S. Sagu、Y. Yusof 等 4 位作者2015-08-12Thin Solid Films

Metallic Zn thin films were electrodeposited on fluorine-doped tin oxide (FTO) glass substrates and oxidized under air by conventional radiant and microwave post-annealing methods to obtain ZnO thin film electrodes. The temperature of each post-annealing method was varied systematically and the photoelectrochemical (P…

Advanced Photocatalysis TechniquesZnO doping and propertiesGas Sensing Nanomaterials and Sensors

Cellular activity of W harton's J elly‐derived mesenchymal stem cells on electrospun fibrous and solvent‐cast film scaffolds

Zohreh Bagher、Somayeh Ebrahimi‐Barough、Mahmoud Azami 等 5 位作者2015-08-12Journal of Biomedical Materials Research Part A

It was shown that topography and surface chemistry of materials influence cell behaviors. In this study, the effects of chemistry and topography of scaffold surface on adhesion, proliferation and differentiation of Wharton's Jelly mesenchymal (WJMSCs) stem cells into motor neurons were investigated. WJMSCs were cultiv…

Nerve injury and regenerationElectrospun Nanofibers in Biomedical ApplicationsTissue Engineering and Regenerative Medicine

Improvement of Stability and Efficacy of C16Y Therapeutic Peptide via Molecular Self-Assembly into Tumor-Responsive Nanoformulation

Yanping Ding、Tianjiao Ji、Ying Zhao 等 11 位作者2015-08-12Molecular Cancer Therapeutics

Peptide therapeutics hold great promise for the treatment of cancer due to low toxicity, high specificity, and ease of synthesis and modification. However, the unfavorable pharmacokinetic parameters strictly limit their therapeutic efficacy and clinical translation. Here, we tailor-designed an amphiphilic chimeric pep…

RNA Interference and Gene DeliverySupramolecular Self-Assembly in MaterialsPeptidase Inhibition and Analysis

Synergistic reinforcement of NBR by hybrid filler system including organoclay and nano‐ CaCO 3

Sina Salkhord、Hedayatollah Sadeghi Ghari2015-08-12Journal of Applied Polymer Science

ABSTRACT Rubber nanocomposites containing one type of nanofiller are common and are widely established in the research field. In this study, nitrile rubber (NBR) based ternary nanocomposites containing modified silicate (Cloisite 30B) and also nano‐calcium carbonate (nano‐CaCO3) were prepared using a laboratory intern…

Polymer crystallization and propertiesPolymer Nanocomposites and PropertiesTribology and Wear Analysis

Hybrid Structure of the Type 1 Pilus of Uropathogenic Escherichia coli

Birgit Habenstein、Antoine Loquet、Songhwan Hwang 等 8 位作者2015-08-12Angewandte Chemie International Edition

Type 1 pili are filamentous protein assemblies on the surface of Gram-negative bacteria that mediate adhesion to host cells during the infection process. The molecular structure of type 1 pili remains elusive on the atomic scale owing to their insolubility and noncrystallinity. Herein we describe an approach for hybri…

Protein Structure and DynamicsLipid Membrane Structure and BehaviorSupramolecular Self-Assembly in Materials

Silica-Protected Hollow Silver and Gold Nanoparticles: New Material for Raman Analysis of Surfaces

Heman Burhanalden Abdulrahman、Jan Krajczewski、Dorota Aleksandrowska 等 4 位作者2015-08-12The Journal of Physical Chemistry C

The first example of Raman analysis of various surfaces using hollow-silver (h-Ag) and hollow-gold (h-Au) nanoparticles protected by the silica layer has been reported. Synthesized h-Ag@SiO 2 and h-Au@SiO 2 nanoparticles are efficient electromagnetic resonators, which locally enhance the electric field of the incident…

Gold and Silver Nanoparticles Synthesis and ApplicationsPlasmonic and Surface Plasmon ResearchNonlinear Optical Materials Studies

Flow-Based Assembly of Layer-by-Layer Capsules through Tangential Flow Filtration

Mattias Björnmalm、Ali Roozmand、Ka Fung Noi 等 7 位作者2015-08-12Langmuir

Layer-by-layer (LbL) assembly on nano- and microparticles is of interest for a range of applications, including catalysis, optics, sensors, and drug delivery. One current limitation is the standard use of manual, centrifugation-based (pellet/resuspension) methods to perform the layering steps, which can make scalable,…

Platelet Disorders and TreatmentsPolymer Surface Interaction StudiesInnovative Microfluidic and Catalytic Techniques Innovation

Using viscoelastic properties to quantitatively estimate the amount of modified poly(lactic acid) chains through reactive extrusion

Jonathan Cailloux、Orlando Onofre Santana Pérez、M. Ll. Maspoch 等 5 位作者2015-08-12Journal of Rheology

In this study, the dynamic viscoelastic properties of three structurally modified poly(lactic acid) (PLA) samples processed through reactive extrusion (REX) were analyzed. While classical chromatographic and spectroscopic techniques exhibited limited sensitivity to the presence of topological changes, rheological meas…

Polymer crystallization and propertiesbiodegradable polymer synthesis and propertiesRheology and Fluid Dynamics Studies

Stretching-Induced Conformational Transition of the Crystalline and Noncrystalline Domains of 13C-Labeled Bombyx mori Silk Fibroin Monitored by Solid State NMR

Tetsuo Asakura、Yuya Sato、Akihiro Aoki2015-08-12Macromolecules

It is important to understand the conformational changes of both the crystalline and the noncrystalline domains of Bombyx mori silk fibroin as they are stretched from soluble Silk I to the mature Silk II fiber, to be able to design man-made strong and tough silk fibers. Here, the Ser, Tyr, and Ala Cβ of silk fibroin w…

Silk-based biomaterials and applicationsSilkworms and Sericulture Research

Electrospinning for Advanced Energy and Environmental Applications

Sara Cavalière2015-08-12OpenAlex

Electrospinning for Advanced Energy and Environmental Applications delivers a state-of-the-art overview of the use of electrospun fibers in energy conversion and storage, as well as in environmental sensing and remediation. Featuring contributions from leading experts in electrospinning and its specific applications,…

Electrospun Nanofibers in Biomedical Applications