Materials Literature
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Porous silicon with surface Si–Ag bonds was prepared by depositing Ag on conventional electrochemically prepared porous silicon using electrodeposition method, and the influence of surface-bonded Ag on photoluminescence properties of the material was studied. Photoluminescence intensity of porous silicon increases wit…
In this work, the previously reported near-field imaging by two strongly coupled arrays of planar magnetic resonators is further studied. Experiments are performed to clarify the physical mechanisms underlying such an effect. The specific aim of these experiments is to clarify both the role played by magnetoinductive…
An optically isotropic, polar smectic C phase composed of chiral and achiral domains, which shows antiferroelectric switching, is demonstrated to be exhibited by the third-generation liquid-crystalline dendrimer with peripheral bent-core (BC) mesogenic units (see figure) reported here. This investigation contributes t…
The effects of V doping on field-cooled magnetization MFC(T), zero-field-cooled magnetization MZFC(T), resistivity ρ, thermoelectric power S, and thermal conductivity κ in manganites CaMn1−xVxO3 (0.02⩽x⩽0.08) have been investigated systematically. As the V doping level exceeds 0.02, an anomalous “diamagnetism” has bee…
A three-dimensional boundary-integral algorithm is developed to study the squeezing of a deformable drop through a tight constriction formed by several solid particles rigidly held in space. The drop is freely suspended and driven by a flow that is uniform away from the solid obstacles. Particular emphasis is on the t…
The strain amplitude dependent internal friction at room temperature and the transition temperatures of CuAlMn-shape memory alloys with Al contents from 8.9 wt.% to 12.7 wt.% and Mn contents from 4.7 wt.% to 9.3 wt.% were investigated. The investigated strain range was 10-6 - 10-3. Rods of various compositions were di…
The damping behavior of an Fe-28Mn-6Si-5Cr-0.5NbC (mass%) shape memory alloy was measured by low cycle fatigue tests during tension-compression loadings. A remarkable damping capacity was observed above the strain amplitude of 0.1%, and the specific damping capacity (SDC) parameter reached saturation at ~ 80% above 0.…
Binary polar–polar liquid mixtures of alkyl acrylates (methyl acrylate, ethyl acrylate and butyl acrylate) with primary alcohols (propan-1-ol, butan-1-ol and hexan-1-ol) were subjected to dielectric studies at 303 K for different concentrations using time domain reflectometry (TDR) over the frequency range from 10 MHz…
Die Risikobeurteilung für Kohlenstoffmaterialien, ein wichtiges Thema der Nanomaterialforschung, wurde durch den Mangel an charakterisierbaren Proben erschwert. Die hier vorgestellten übergangsmetallfreien Kohlenstoff-Nanohornaggregate – kovalent gebundene Aggregate von Einzelwand-Nanoröhren – wurden in wasserlösliche…
An innovative methodology is presented that utilizes the experimental results of electron backscattered diffraction to map the crystallographic orientation of each grain, the finite element method to simulate the local grain-grain interactions, and finally piezoforce microscopy to infer the local properties of polycry…
Small neutral, anionic, and cationic silver cluster hydrides AgnH and anionic HAgnH (n=1-7) have been studied using the PW91PW91 density functional method. It was found that the most stable structure of the AgnH complex (neutral or charged) does not always come from that of the lowest energy bare silver cluster plus a…
We calculate the minimum energy paths and reaction energies of the adsorption of the epoxide adhesive components diglycidylesterbisphenol A (DGEBA), diethyltriamine (DETA), and the adhesion promoter 3-aminopropylmethoxysilane (AMEO) at two different sites on a model of the native Al2O3 surface, using the nudged elasti…
Abstract The forces between mica surfaces confining solutions of spherical and rod‐shaped ZnS nanoparticles (diameter ca. 5 nm) coated with hexadecylamine or octadecylamine surfactant in dodecane have been measured in the absence and after the introduction of trace amounts of water. Initially, or at very low water con…
In this paper we derive an analytical expression of free Green's functions or propagators of graphene in real space by using the effective-mass approximation. We find that the propagator is highly spatial anisotropic and has threefold symmetry. We also present a theoretical model for explaining scanning tunnel microsc…
Spontaneous entropic phase separation phenomena occur in a wide range of systems containing highly anisotropic colloidal particles. Among these are aqueous suspensions of negatively charged cellulose I nanocrystals produced by sulfuric acid hydrolysis of native cellulose, which phase separate into isotropic and chiral…
We present the first characterization of the mechanical properties of lysozyme films formed by self-assembly at the air-water interface using the Cambridge interfacial tensiometer (CIT), an apparatus capable of subjecting protein films to a much higher level of extensional strain than traditional dilatational techniqu…
We report on a systematic study of structural, optical, electrical, and magnetic properties of Zn1−xCoxO (x=0.05–0.29) thin films codoped with Al (<0.1%). Both codoped (in which Co is cosputtered with other elements) and δ-doped (in which Co is doped digitally in the host matrix) samples have been prepared and…
Humans have always looked to nature for design inspiration, and material design on the molecular level is no different. Here we explore how this idea applies to nanoscale biomimicry, specifically examining both recent advances and our own work on engineering lipid and polymer membrane systems with cellular processes.
Amorphous arsenic sulphide (As2S3) films prepared by ultrafast pulsed laser deposition have been vacuum annealed at a range of different temperatures. Measurements of the glass transition temperature indicate that a crystallization process initiates at annealing temperatures around 170°C. In combination with Raman sca…
Hybrid organic/inorganic white light-emitting diodes (LEDs) were fabricated of semiconductor polymer poly(N-vinylcarbazole) (PVK) doped with CdSe/CdS core–shell semiconductor quantum dots (QDs). The device, with a structure of indium–tin-oxide (ITO)|3,4 - polyethylene–dioxythiophene–polystyrene sulfonate (PEDOT:PSS)|P…