Materials Literature
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Abstract TlInS 2 single crystals are studied through the conductivity and Hall effect measurements in the temperature regions of 100‐400 and 170‐400 K, respectively. An anomalous behavior of Hall voltage, which changes sign below 315 K, is interpreted through the existence of deep donor impurity levels that behave as…
Abstract A method is presented for developing multiple particle breakage distribution functions that include the shape factor, as well as the particle size. The technique is to first develop a joint probability distribution that accounts for the size and shape factor of each child particle. This is then reduced by suc…
A maskless method for patterning substrates using surface relief structures on azobenzene‐functionalized polymer is demonstrated. Surface relief structures are inscribed on a polymer film spin‐coated on an indium tin oxide (ITO) substrate by exposure to an interference pattern. Etching with oxygen plasma followed by a…
A new synthesis of the silicon‐network‐backbone polymer poly(methylsilyne) gives a material that is easily converted by pyrolysis to smooth continous films of stoichiometric silicon carbide (see Figure). The films are adherent to the silicon or alumina substrates, and show root mean square roughness of 169 Å over a 50…
We study the aging dynamics in a model for dense simple liquids, in which particles interact through a hard-core repulsion complemented by a short-ranged attractive potential, of the kind found in colloidal suspensions. In this system, at large packing fractions, kinetically arrested disordered states can be created b…
A synergistic study, using gradient corrected density functional theory and photoelectron spectroscopy, shows that the presence of oxygen can fundamentally alter the interaction between two Mn atoms. The normally weak interaction between two Mn atoms exhibits strong bonding when an oxygen atom is added to form ${\math…
Abstract The flow stress in the yield surface of plastic constitutive equation is modified with a higher order gradient term of the effective plastic strain to model the effect of inhomogeneous deformation in granular materials. The gradient constitutive model has been incorporated into the finite element code ABAQUS…
Abstract CoSBA-15 with different nSi/nCo ratio have been synthesized in acidic media using nonionic surfactants and characterized, for the first time, by XRD, AAS, N2 adsorption, UV–vis DRS and ESR spectroscopy. Spectroscopic data show that all cobalt atoms in CoSBA-15 are extensively in tetrahedral coordination.
Abstract Highly ordered anodic porous alumina was fabricated by anodization of vapor-deposited Al that had been deposited on a self-organized periodic array of polystyrene particles with a submicron-scale diameter on a glass plate. The ordered bumpy structure of the particle array surface was replicated on the deposit…
Abstract In our previous work, we showed that the structural recovery responses of an epoxy after relative humidity (RH)‐jumps through the glass concentration have similar phenomenology to, but different kinetics from, those obtained by temperature (T)‐jumps. In this article, we report results from physical aging expe…
Self‐assembled monolayer coating of silane molecules on the surface of nanometric particles of hydroxyapatite and TiO 2 has been performed using a supercritical (SC) fluid method. The performance of the SC method is compared to that of a conventional (CV) aqueous alcohol method (see Figure). SC anhydrous silanization…
The ability to determine the nature and the occurrence of defects is a central need of ceramic surface chemistry. In titanium oxides, the $\mathrm{Ti}\ensuremath{-}\mathrm{LMV}$ Auger decays line shape is very sensitive to the titanium degree of oxidation, and has long been empirically used as a qualitative probe of t…
In nature, peptides bind metals reproducibly and selectively via specific amino acid sequences, producing nanocrystals in controlled sizes and morphologies. A novel method of growing uniform nanocrystals directly on biological nanotubes by immobilizing synthetic Ni‐mineralizing peptides on the nanotubes is reported (s…
Abstract Growth kinetics of zinc (tris) thiourea sulphate (ZTS) crystals investigated as a function of supersaturation is reported in this communication. Crystal growth rates were investigated normal to the (100), (010) and (001) faces under growth conditions employed for bulk crystal growth. The growth rates normal t…
Abstract We prepared a square cyclic porphyrin dodecamer via the tetramerization of a trimer shaped like a right angle. The molecule was visualized by scanning tunneling microscopy to be square.
Single‐crystal Sb 2 S 3 nanotubes with chain‐like structures (see Figure) have been successfully synthesized by chemical vapor transport using sulfur as the transport agent. Detailed characterization of the nanotubes shows the growth direction of Sb 2 S 3 nanotubes is determined by the crystallographic orientation of…
Abstract The whole controlled synthesis of novel amphiphilic polylactide (PLA)‐grafted dextran copolymers was achieved. The control of the architecture of such biodegradable and potentially biocompatible copolymers has required a three‐step synthesis based on the “grafting from” concept. The first step consisted of th…
The thermal conductivity of molten sodium chloride and potassium chloride has been computed through equilibrium molecular dynamics Green-Kubo simulations in the microcanonical ensemble (N,V,E). In order to access the temperature dependence of the thermal conductivity coefficient of these materials, the simulations wer…
We have investigated the electrolyte-induced collapse of a polyelectrolyte brush covalently attached to a planar solid surface. Positively charged poly-4-vinyl [N-methyl-pyridinium] (MePVP) brushes were prepared in situ at the surface by free radical chain polymerization using a surface-immobilized initiator monolayer…
Abstract Tris (thiourea) zinc sulphate (ZTS), a semiorganic nonlinear optical (NLO) material has been synthesized at 30 °C. The solubility was determined in different solvents such as water, ethanol and water mixture of ethanol (1:1). Good quality single crystals with size 10 × 8 × 6 mm 3 were grown by slow evaporatio…