Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTFabrication of Gold Nanoparticles Using a Trithiol (Thiocyanuric Acid) as the Capping AgentYiwei Tan, Yongfang Li, and Daoben ZhuView Author Information Laboratory of Organic Solids, Center for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 1000…
Abstract Different multiple hard segment polyurethane–imide copolymers (MHPUI) were synthesized and characterized. FTIR spectroscopy confirmed the characteristic absorption of the MHPUI copolymer. The difference in the imide group FTIR absorption bands in different MH segment PUI copolymers was found in this study and…
We have studied the concentration dependence of the Raman spectra of heteroepitaxial $({\mathrm{Ba}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}){\mathrm{TiO}}_{3}$ (BST) $(x=0,$ 0.15, 0.30, and 0.45) thin films deposited by rf sputtering on (001) MgO substrates. It is found that substitution of Ba by Sr leads to the distorti…
The application of thin film materials in advanced technologies is increasing as new generations of complex electronic, optical and magnetic devices are developed. The dynamics of the growth of thin and ultra-thin films and their evolving, dimensionally dependent, properties are of crucial importance in understanding…
Li 2 MnO 3 and the spinel LiZn 0.5 Mn 1.5 O 4 each contain a subset of lithium ions in very similar octahedral environments, in terms of the Li−O−Mn connectivities (i.e., numbers of nearby manganese ions and Li−O−Mn bond angles). We show, however, that the different geometric arrangements of the Mn ions about the lith…
Recombinant Ralstonia eutropha capable of producing poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) copolymer [P(3HB-co-3HHx)] from fructose was engineered by introduction of genes for crotonyl-CoA reductase (CCR) from Streptomyces cinnamonensis (ccrSc) and for PHA synthase and (R)-specific enoyl-CoA hydratase from Aero…
We study here, within the density-functional theory, the magnetic anisotropy energy (MAE) in ${\mathrm{Ni}}_{2}\mathrm{MnGa}$ which is a prototype of a magnetic shape-memory alloy. We calculate the MAE, which is a key property for the magnetic shape-memory effect, for tetragonal structure with different ratios of the…
The adsorption of polyelectrolytes to charged surfaces can be applied to build up multilayers of polyelectrolytes of alternating charge by layer-by-layer assembly. The hydration of such multilayers adsorbed to colloidal particles in dilute aqueous dispersions is investigated by NMR, namely, water 1 H spin relaxation r…
Plasma etching was applied for removal of the amorphous carbon layer that covers aligned carbon nanotube films produced by pyrolysis of metal-containing organometallic precursors. Microscopic and kinetic studies showed that amorphous carbon could be easily removed by H 2 O-plasma etching while carbon nanotubes remain…
Two different SiO 2 −CaO−P 2 O 5 glasses have been synthesized by the sol−gel method, and the stabilization of the gel glasses was carried out at temperatures between 500 and 800 °C. The different thermal treatments lead to changes in the structural and textural properties. When the glasses were soaked in a buffered s…
Starting from a model of rigid interacting C60 polymer chains on an orthorhombic lattice, we study the mutual orientation of the chains and the stability of the crystalline structures Pmnn and I2/m. We take into account i) van der Waals interactions and electric quadrupole interactions between C60 monomers on differen…
[structure: see text]. 1: R = beta-D-glucopyranoside. 2: R = alpha-D-glucopyranoside. 3: R = alpha-D-galactopyranoside. 4: R = alpha-D-mannopyranoside. As an attempt to rationally design aqueous organogelators, a bolaamphiphilic azobenzene derivative (1) bearing two sugar groups was synthesized. Compound 1 formed a ge…
The disproportionation of CO over Co−Mo/SiO 2 catalysts with low Co/Mo ratios results in a high selectivity to single-walled carbon nanotubes (SWNTs) when the reaction is conducted between 700 and 950 °C in a flow of pure CO at a total pressure between 1 and 5 atm. A detailed characterization involving Raman spectrosc…
We investigate autogenous fragmentation of dry granular material in rotating cylinders using two-dimensional molecular dynamics. By evaluation of spatial force distributions achieved numerically for various rotation velocities we argue that comminution occurs mainly due to the existence of force chains. A statistical…
We propose a simple phenomenological model describing composite crystals, constructed from two parallel sets of periodic inter-penetrating chains. In the harmonic approximation and neglecting thermal fluctuations we find the eigenmodes of the system. It is shown that at high frequencies there are two longitudinal soun…
We study the motion of a grain boundary separating two otherwise stationary domains of hexagonal symmetry. Starting from an order parameter equation appropriate for hexagonal patterns, a multiple scale analysis leads to an analytical equation of motion for the boundary that shares many properties with that of a crysta…
Explicit expressions for anharmonic contributions to the thermodynamic properties with allowance for higher-order phonon-phonon interactions for closed-packed crystals are given, and the calculations for some fcc metals near the melting (Ir, Rh) and martensite phase transition (Ca, Sr) points are carried out. A detail…
In horizontally shaken granular material different types of pattern formation have been reported. We want to deal with the convection instability which has been observed in experiments and which recently has been investigated numerically. Using two dimensional molecular dynamics we show that the convection pattern dep…
The modeling of the elastic properties of disordered or nanoscale solids requires the foundations of the theory of elasticity to be revisited, as one explores scales at which this theory may no longer hold. The only cases for which microscopically based derivations of elasticity are documented are (nearly) uniformly s…
The onset of surface fluidization of granular material in a vertically vibrated container, z=A cos(ωt), is studied experimentally. Recently, for a column of spheres it has been theoretically found that the particles lose contact if a certain condition for the acceleration amplitude \ddot{z} \equiv Aω^2/g = f(ω) holds.…