Materials Literature
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Element Substitution Effect in Transition Metal Oxypnictide Re(O1-xFx)TAs (Re = rare earth, T = transition metal), Chen Gen-Fu, Li Zheng, Wu Dan, Dong Jing, Li Gang, Hu Wan-Zheng, Zheng Ping, Luo Jian-Lin, Wang Nan-Lin
We correlate electron transport data directly with energy band structure measurements in vanadium oxide thin films with varying V-O stoichiometry across the ${\text{VO}}_{2}$ metal-insulator transition. A set of vanadium oxide thin films were prepared by reactive dc sputtering from a V target at various oxygen partial…
A series of imidazolium-based room-temperature ionic liquids (RTILs) containing anions from organic carboxylic acids were prepared. A set of dye probes, including Reichardt's dye (30), 4-nitrioaniline, and N, N-diethyl-4-nitroaniline, were used to determine the ET(30) scales and the Kamlet-Taft parameters (pi*, alpha,…
We report the specific heat measurements on the newly discovered Fe-based layered LaO 0.9 F 0.1-δ FeAs superconductor with the onset transition temperature T c ≈ 28K. A nonlinear magnetic field dependence of the electronic specific heat coefficient γ(H) has been found in the low temperature limit, which is consistent…
Micrometer-sized bubbles are unstable and therefore difficult to make and store for substantial lengths of time. Short-term stabilization is achieved by the addition of amphiphilic molecules, which reduce the driving force for dissolution. When these molecules crystallize on the air/liquid interface, the lifetime of i…
Ordered nanofiber arrays are a promising material platform for artificial adhesive structures, tissue engineering, wound dressing, sensor arrays, and self-cleaning surfaces. Their production via self-ordered porous alumina hard templates serving as shape-defining molds is well-established. However, their release requi…
In-situ thermal ellipsometric analysis is used to elucidate new and fine-scale details on the thermally driven densification, pyrolysis, crystallization, and sintering of dense and ordered mesoporous titania thin films prepared by evaporation-induced self-assembly. The role of the heating schedule, initial film thickn…
Edges and steps have been identified as the locations of surface (O2) and subsurface oxygen atoms (O1) on silver particles by means of DFT calculations and aberration-corrected transmission electron microscopy. The experimental technique allows surface features, such as terraces, steps, and edges, to be clearly imaged…
Colloidal PbS nanocrystals (NCs) emitting in the 1100−1800 nm range have been synthesized. Introduction of trioctylphosphine into the reaction plays a crucial role in synthesizing highly photoluminescent and nearly monodisperse PbS NCs with a full width at half-maximum of the photoluminescence peak as low as 49 meV an…
To explore molecular recognition of biomolecules in the complex environment of the extracellular matrix, we utilized two fluorescent poly(p-phenyleneethynylene)s bearing either cationic alkylammonium or negatively charged carboyxlate side chains. While incubation of live NIH 3T3 fibroblast cells with the cationic poly…
Atomic layer deposition (ALD) was utilized for the surface engineering of metallic nanoparticles to tame their sintering problems and catalytic activities. We chose the surface modification of gold nanocatalysts as an example to demonstrate the concept of this ALD-based approach. Herein, an active Au/TiO 2 catalyst wa…
We have prepared h -MoO 3 nanocrystals in the form of well-faceted straight hexagonal rods with an aspect ratio of l/d ≃ 60. The nanocrystals have been characterized by x-ray diffraction, scanning and transmission electron microscopy, and IR/Raman spectroscopy. Their phase composition has been determined, and their mo…
The structural and dynamic properties of silica melts under high pressure are studied using molecular dynamics (MD) computer simulation. The interactions between the ions are modelled by a pairwise-additive potential, the so-called CHIK potential, that has been recently proposed by Carré et al 2008 Europhys. Lett. 82…
The high-pressure dynamics of a computer-modelled silica melt is studied in the framework of the mode-coupling theory of the glass transition using static structure input from molecular dynamics computer simulation. The theory reproduces the experimentally known viscosity minimum (diffusivity maximum) as a function of…
The local deformation of two-dimensional Lennard-Jones glasses under imposed shear strain is studied via computer simulations. Both the mean squared displacement and mean squared strain rise linearly with the length of the strain interval $\Delta \gamma$ over which they are measured. However, the increase in displacem…
Current-induced magnetic switching of a single magnetic molecule attached to two ferromagnetic contacts is considered theoretically, with the main emphasis put on the role of intrinsic spin-relaxation processes. It is shown that spin-polarized current can switch magnetic moment of the molecule, despite the intrinsic s…
Introduction (Amit Bhattacharya and Paramita Ray). 2. Basic Features and Techniques (Amit Bhattacharya and Paramita Ray). 3. Mechanism and Kinetics (Chris Fellows). 4. Analytical Evidences (Amit Bhattacharya and Paramita Ray). 5. Broader Spectrum: Examples (Inderjeet Kaur and Paramita Ray). 6. In Biomedical Arena (Gau…
Room-temperature ferromagnetism has been observed in undoped $\mathrm{GaN}$ and $\mathrm{CdS}$ semiconductor nanoparticles of different sizes with the average diameter in the range $10--25\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$. These nanoparticles were synthesized by simple routes and thoroughly characterized by vari…
Micrometer-sized spherical polycrystalline particles of bismuth tungstate (Bi 2 WO 6 ) of a hierarchical “flake-ball” shape were prepared by a facile hydrothermal reaction without using any surfactants and polymers as structure-directing agents. The flake-ball particles were assemblies of polycrystalline flakes compos…
The adsorption of bovine serum albumin (BSA) in a planar poly(acrylic acid) (PAA) brush layer has been studied by fixed-angle optical reflectometry. The influence of polymer length, grafting density, and salt concentration is studied as a function of pH. The results are compared with predictions of an analytical polye…