Materials Literature
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A facile and unique but versatile approach for the synthesis of highly organized mesoporous mixed-element oxide materials with defined structure, high heteroatom content, and stable active sites is presented (see figure). Because of the high homogeneity of the Al sites, the controlled immobilization of (bio)molecules…
Nonlinear aspects of relaxation and are related to new type of critical phenomena in ensembles of mesoscopic defects - structural-scaling transitions, generation of specific collective modes of mesodefects, which subject the relaxation and kinetics of damage-failure transition. Theoretical results were supported by or…
A mechanism-based microscale kinetic theory for strain-induced structural changes (SCs) (that includes phase transformations (PTs) and chemical reactions (CRs)) is developed. Time is not an independent parameter in this theory; instead, plastic strain is a time-like parameter. Kinetics depends essentially on the ratio…
Isotopically enriched 10BN nanotubes, shown in the figure, have been produced for the first time. Secondary ion mass spectroscopy analysis confirms a high content of 10B in the nanotubes. The 10BN nanotubes are lightweight, have excellent mechanical properties, a stronger resistance to oxidation than carbon nanotubes,…
Quantification of energetics and kinetics for the band-edge exciton states of quantum dots and the long-lived dark state is important for better understanding of the underlying mechanism for single-particle intermittency and ensemble fluorescence intensity decay. Based on a multistate diffusion-reaction model by exten…
Atomic structures of amorphous Al(89)La(6)Ni(5), prepared by single-roller melt spinning, and pre-annealed at 493 and 588 K for 1 h, were characterized by differential scanning calorimetry, x-ray diffraction with a large wavevector transfer value, La L(3)-edge and Ni K-edge x-ray absorption fine structure and the reve…
Dislocation dynamics (DD) simulations are used to investigate precipitation-induced strengthening in a Zr–1% Nb alloy. A method is proposed to carry out simulations under dynamical conditions in connection with the microstructure of the investigated alloy. First, a sensitivity study of simulation parameters, suspected…
In a previous deuterium NMR study conducted on a liquid crystalline (LC) polymer with laterally attached book-shaped molecules as the mesogenic moiety, we have revealed a biaxial nematic phase below the conventional uniaxial nematic phase (Phys. Rev. Lett. 2004, 92, 125501). To elucidate details of its formation, we h…
The microstructure and electronic structure of silicon-rich oxide (SRO) films were investigated using transmission electron microscopy and electron energy loss spectroscopy as the main analytical techniques. The as-deposited SRO film was found to be a single phase SiO1.0, as suggested by its electronic structure chara…
In order to determine the influence of the thermal history (fictive temperature) and OH content on the elastic properties of silica glass, we have investigated high resolution in situ Brillouin experiments on SiO(2) glass from room temperature to the supercooled liquid at 1773 K across the glass transition. The well k…
Abstract Summary: The flex‐fatigue life of carbon‐black‐filled SBR was dramatically improved by incorporation of 4–5 phr nanodispersed clay. Addition of clay did not decrease the degree of crosslinking of the composite but improved the hysteresis and tearing energy. ESEM observation of the flexing‐fracture morphology…
A new open-framework indium sulfide ([In12S24H2]10-) constructed from pentasupertetrahedral sulfide clusters ([In8S17H],9- P1) and supertetrahedral sulfide clusters ([In4S10H],7-) T2) has been prepared through hydrothermal synthesis. Unlike previously reported P1 clusters that require divalent metal cations, the P1 cl…
Using molecular dynamics simulation we examine changeovers among crystal, glass, and liquid at high density in a two dimensional binary mixture. We change the ratio between the diameters of the two components and the temperature. The transitions from crystal to glass or liquid occur with proliferation of defects. We v…
Abstract Nanoparticle additives provide a means of imparting the desired electrical, optical, or mechanical properties to a polymeric matrix. The difficulty faced in creating these composites is determining the optimal conditions for forming a thermodynamically stable mixture, where the particles will not phase separa…
The effect of complexant shape effect on the first hyperpolarizability beta(0) of alkalides Li(+)(NH(3))(4)M(-) (M=Li, Na, K) was explored. At the MP2/6-311++G level, Li(+)(NH(3))(4)M(-) (M=Li, Na, K) have considerable beta(0) values due to excess electrons from chemical doping and charge transfer. By comparison with…
Despite its generally poor catalytic properties, bulk gold metal is observed to catalyze reactions of isocyanides (CN-R) with primary amines (H2N-R') and O2 to give carbodiimides (R-N=C=N-R') at room temperature and above. Detailed infrared reflection absorption spectroscopic (IRRAS) and kinetic studies show that the…
Ureasils are nanocomposite organic−inorganic materials based on a silica backbone covalently connected through urea bridges with poly(oxyalkylene) chains. Ureasil gels are synthesized by the sol−gel procedure. These gels can efficiently adsorb and retain dyes from aqueous solutions and, thus, can be employed as water…
We investigate both thermoelectric and thermodynamic properties of the misfit cobalt oxide $[{\mathrm{Bi}}_{1.7}{\mathrm{Co}}_{0.3}{\mathrm{Ca}}_{2}{\mathrm{O}}_{4}{]}_{0.6}^{\mathrm{RS}}{\mathrm{CoO}}_{2}$. A large negative magnetothermopower is found to scale with both magnetic field and temperature, revealing a sig…
Using atomistic simulations of dislocation motion in Ni and $\mathrm{Ni}\text{\ensuremath{-}}\mathrm{Au}$ alloys we report a detailed study of the mobility function as a function of stress, temperature, and alloy composition. We analyze the results in terms of analytic models of phonon radiation and their selection ru…
Ordered arrays of nickel nanotubes (see figure) have been prepared by a novel and universal approach, utilizing the triblock copolymer Pluronic P123 without any surface modification to the porous alumina template. The wall thickness of the nickel nanotubes can be adjusted by the electric current density and electrodep…