Materials Literature
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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…
Author: Logvinova, A. M. et al.; Genre: Conference Paper; Finally published : 2006; Keywords: July 23-28, 2006; Title: Nanometre-sized mineral and fluid inclusions in cloudy Siberian diamonds: new insights on diamond formation
Using x-ray resonant magnetic scattering and x-ray magnetic circular dichroism, techniques that are element specific, we have elucidated the role of ${\mathrm{Ho}}^{3+}$ in multiferroic ${\mathrm{HoMnO}}_{3}$. In zero field, ${\mathrm{Ho}}^{3+}$ orders antiferromagnetically with moments aligned along the hexagonal $\m…
Amorphous carbon films with $sp\text{\ensuremath{-}}s{p}^{2}$ hybridization, produced by supersonic cluster beam deposition, shows the presence of both polyynic and cumulenic species [L. Ravagnan et al., Phys. Rev. Lett. 98, 216103 (2007)]. Here, we present an in situ Raman characterization of the low-frequency vibrat…
Platinum is widely used as a pressure calibration standard. However, the established thermal EOS has uncertainties, especially in the high $P$-$T$ range. We use density functional theory to calculate the thermal equation of state of platinum, up to 550 GPa and 5000 K. The static lattice energy is computed by using the…
Effects of the growth velocity on the crystal growth behavior of Bi_2Sr_2Ca_1Cu_2O_x (Bi-2212) have been studied by floating zone technique. The results show that a necessary condition for obtaining large single crystals along the c-axis is that the solid-liquid interface of a growing rod maintains a stable planar gro…
Graphene on a substrate has been shown to exhibit a transition, depending on the substrate material, from a zero-gap semiconductor state to a semimetallic state. The ground-state energy of the electron (hole) gas has been calculated within the random-phase approximation.
BaTiO 3 ceramics with a high piezoelectric coefficient have been successfully obtained through the conventional solid-state reaction route starting from ordinary BaCO 3 and TiO 2 powders. The ceramics sintered at 1210 °C exhibit excellent piezoelectric properties of d 33 = 419 pC N −1 and k p = 0.453 with tan δ = 1.36…
Large scale biomimetic single-walled carbon nanotube (SWNT) coatings with significant antimicrobial activity, high Young's Modulus, and controlled morphology were fabricated using layer-by-layer assembly. Thickness was controlled within 1.6 nm and SWNT orientation was controlled using a directed air stream. This uniqu…
We introduce a technique to retrieve effective metamaterial parameters for arbitrary angles of incidence. It employs the complex reflection and/or transmission coefficients of a finite slab. Explicit expressions for both polarizations are derived and the constraints to be met for obtaining unique solutions are discuss…
Thermoelectric (TE) performances are systematically investigated for the pellets of poly(3,4-ethylenedioxythio-phene):poly(styrenesulfonate) (PEDOT:PSS) with different organic additives and heating process as organic TE materials. The electrical conductivity, Seebeck coefficient and thermal conductivity versus tempera…