Materials Literature
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The crystallization and dielectric properties of SrO–BaO–Nb 2 O 5 –SiO 2 glass‐ceramics have been investigated. Glass‐ceramics that contain strontium barium niobate (SBN) as a primary crystalline phase, which has a tungsten bronze structure, are produced. The formation of crystalline secondary phases also has been stu…
The self-nucleation of branched polyethylene chains of different degrees of chain mobility was studied. The polyethylene block (PE block) within poly(styrene-b-ethylene-b-caprolactone) triblock copolymers (SEC) of varying compositions was studied. Differential scanning calorimetry was used to determine the self-nuclea…
The phase behavior of rod−plate mixtures was investigated using model systems of unambiguously rod- and plate-shaped colloids. Neither at equilibrium nor in the early stages of the phase separation process do we observe the theoretically disputed biaxial nematic phase. Instead, the mixtures show demixing into an isotr…
ZnO thin films have been grown on various substrates by femtosecond pulsed-laser deposition. According to optical microscopy and atomic force microscopy analyses, the production of droplets is not significant using femtosecond pulses. Smooth, dense, stoichiometric, crystalline, and textured hexagonal ZnO films are epi…
We present a model to more accurately describe the optical properties of a twisted nematic liquid crystal display (LCD). In particular, we study the optical properties of molecules near either edge of the LCD that are unable to twist and tilt under the application of an external elec- tric field. The properties of the…
Composite materials such as clay sheets intermixed with polymershave important potential applications; however, some fundamental properties remain to be understood. The equilibrium phase behavior of polymer–clay nanocomposites is examined here. The authors build on their recently proposed model that combines self-cons…
Phosphino carboxylic acid ester terminated G(0) compounds Si(CH(2))(3)SiMe(2)(C(6)H(4)CH(2)OC(O)(CH(2))(n)()CH(2)PPh(2)(4) (9a and 9b; n = 1, 2) and the carbosilane dendrimers Si(CH(2))(3)Si((CH(2))(3)SiMe(2)(C(6)H(4)CH(2)OC(O)(CH(2))(n)()CH(2) PPh(2))(3)(4) (10a and 10b; n = 1, 2) have been prepared as hemilabile nan…
Highly organized and textured CTAB templated silica films are made by the spin-coating technique. The HRTEM structural characterization of these films clearly shows the formation of a 3D hexagonal structure ( P 6 3 / mmc space group) due to the stabilization of a new phase which does not belong to the phase diagram of…
Hybrid organic−inorganic proton conducting gels (PWA/ICS−PPG or SiWA/ICS−PPG) were made from 3-isocyanatopropyltriethoxysilane and poly(propylene glycol)bis(2-aminopropyl ether), resulting in a hybrid silicon precursor (ICS−PPG) in which was dispersed phosphotungstic acid (PWA) or silicotungstic acid (SiWA) in ethanol…
The coexistence of ferromagnetic and paramagnetic phases in the $4f$-electron systems ${\mathrm{Gd}}_{5}{(\mathrm{S}\mathrm{i}}_{1.5}{\mathrm{Ge}}_{2.5})$ and ${\mathrm{Gd}}_{5}{(\mathrm{S}\mathrm{i}}_{2}{\mathrm{Ge}}_{2})$ during the magnetic-martensitic phase transition have been observed. A dc magnetic field revers…
A comparative study of the temperature-dependent Raman scattering of nanocrystalline and bulk silicon is presented. The nanocrystalline silicon samples were made by a cw laser annealing process, and the characteristic dimensions were determined with a phenomenological phonon confinement model. Experimental results ind…
The stability of charge-orbital ordering in a colossal magnetoresistance (CMR) manganite can be varied to a large extent by doping of Cr impurities on the Mn site. Most of the generic features seen in the CMR manganites, such as the submicrometric phase separation into metallic and insulating states, a resistivity-enh…
Nanocrystal shape can have a strong influence on the 2D and 3D structure of nanocrystal (NC) arrays, and it is important to understand its role if functional magnetic nanodevices are to be realized. Here is presented a detailed TEM analysis of 11 nm Co NCs and their effect on the superlattice assembly. Twins and stack…
The past decade has seen an explosive growth in atomic-level structures determined by X-ray crystallography. Synchrotron radiation and a number of technical advances related quite directly to its development have fueled this growth. With the most recent advances coming to be used collectively and new resources being b…
The single-molecule magnets (SMMs) [Mn 4 O 3 X(OAc) 3 (dbm) 3 ] (X = Br, Cl, OAc, and F) were investigated by a detailed inelastic neutron scattering (INS) study. Up to four magnetic excitations between the zero-field split levels of the lowest S = 9 / 2 cluster ground-state have been resolved. From the determined ene…
The interfacial characteristics between amine-functionalized polystyrene/copper and between hydroxyl-functionalized polystyrene/copper were investigated by adhesion strength measurements and reflection absorption infrared (RAIR) spectroscopy. Poly(styrene-co-4-aminostyrene) (PS-NH2) and poly(styrene-co-4-hydroxystyren…
This study concerns a theoretical investigation based on the isothermal equation of state to explain the inverse Hall-Petch relationship and theoretical limit of mechanical stability of grain boundaries in the nanocrystalline metals. It is suggested that the excess free volume of the grain boundary atoms may induce a…
The absolute magnetic susceptibility as a function of temperature withdifferent amplitude and frequency of the applied field is used to characterizethe magnetic properties of high Tc – superconductors. In the present work ourdesign of a laboratory- built ac susceptometer based on the mutual inductancemethod using loca…
Enantioselective enzymatic acylation, using Lipase PS® (Pseudomonas sp., immobilized on Celite, Amano Pharmaceutical Co., Ltd.), of endo-dihalosubstituted and nonsubstituted dispiro[2.0.2.1]heptylmethanol and endo-4-methylenespiropentylmethanol provided the corresponding optically active compounds in high enantiomeric…
Dispersion polymerization of styrene (S) and vinylbenzyltrimethylammonium chloride (VBA) was conducted in an ethanol-water medium using an aromatic poly(amic acid) (PAA) as the stabilizer. When equimolar amounts of VBA and the carboxylic acid of PAA were used, monodisperse particles with high PAA content were obtained…