Materials Literature
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Photoinduced alignment behavior in a series of polymer liquid crystals containing different azobenzene moieties in the side chain was investigated. With increase of the strength of donor and acceptor at 4 and 4‘ positions of the azobenzene groups, the possibility of an alignment change in the polymer liquid crystals h…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTGraft Polymerization of l-Lactide on Pullulan through the Trimethylsilyl Protection Method and Degradation of the Graft CopolymersYuichi Ohya, Shotaro Maruhashi, and Tatsuro OuchiView Author Information Department of Applied Chemist…
We studied the adsorption of polystyrene nanospheres that have anionic charges on their surfaces from their aqueous dispersions onto the surfaces of cationic ultrathin polymer films quantitatively and kinetically by using a quartz crystal microbalance (QCM) and scanning electron microscopy (SEM). The polymer films wer…
Recent work on single-bubble sonoluminescence (SBSL) has shown that many features of this phenomenon, especially the dependence of SBSL intensity and stability on experimental parameters, can be explained within a hydrodynamic approach. More specifically, many important properties can be derived from an analysis of bu…
Steady shear flow properties of an extensive family of dendrimers were examined for the first time in medium to high concentration solutions. For this, the first seven generations of ethylenediamine (EDA) core−polyamidoamine (PAMAM) dendrimers, having molecular weights from about 500 to almost 60 000 in 30 to 75 wt %…
We present a new method for simulating crystal growth by energetic beam deposition. The method combines a Kinetic Monte-Carlo simulation for the thermal surface diffusion with a small scale molecular dynamics simulation of every single deposition event. We have implemented the method using the effective medium theory…
In this article, we propose a new method to compute the effective properties of non-linear disordered media. We use the fact that the effective constants can be defined through the minimum of an energy functional. We express this minimum in terms of a path integral allowing us to use many-body techniques. We obtain th…
Generation of electric power by the Nernst effect is a new application of a semiconductor. A key point of this proposal is to find materials with a high thermomagnetic figure-of-merit, which are called Nernst elements. In order to find candidates of the Nernst element, a physical model to describe its transport phenom…
Segmental relaxation was measured for a series of polysytrenes (PS) of varying molecular weight. The normalized Arrhenius plots of segmental relaxation times (fragility curves) become less steep for shorter chain lengths. Since the shape of the relaxation function is invariant to molecular weight, such behavior is a d…
ZnO nanoparticles in the size range from 2 to 7 nm were prepared by addition of LiOH to an ethanolic zinc acetate solution. This method [Spanhel, L.; Anderson, M. A. J. Am. Chem. Soc. 1991, 113, 2826] was modified and extended at several points. The synthesis of very small ZnO nuclei was simplified. It was found that…
The macrocyclic hexanuclear metal cluster, [Mn(III)(6)(fshz)(6)S(6)], 1 (S = MeOH), was prepared using a trianionic pentadentate ligand, N-formylsalicylhydrazidate (fshz(3)(-)). Due to the meridional coordination of the ligand to the metal ion, the ligand is not only bridging the ring metal ions using a hydrazide N-N…
Adsorption of N, N -dimethylformamide (DMF) molecules on the surface of ZnS nanocrystallites was investigated by in situ Fourier transform IR and NMR spectroscopy in acetonitrile (AN)/methanol mixture solution. The C O stretching vibration (ν C O ) of DMF molecule shifted to a lower wavenumber when adsorbed on ZnS nan…
We present an X-ray absorption spectroscopy study of the local structures of Gd(DTPA)(2)(-) and Gd(DOTA)(-) complexes in the crystalline state (at room and low temperatures) and in aqueous solutions exhibiting various pH values (0.15-7) at different temperatures (25-90 degrees C). Using X-ray absorption fine structure…
Kinetics of interdiffusion of a miscible polymer pair, high density polyethylene (HDPE) and linear low density polyethylene (LLDPE), was studied experimentally in order to characterize the conditions required to construct gradient morphologies from microlayers. Microlayers were taken into the melt for a period of time…
Hydrated tungsten peroxides have been synthesized via the reaction of tungstic acid, H 2 WO 4, with aqueous solutions of hydrogen peroxide. Two crystalline phases with the formula [WO 2 (O 2 )H 2 O]· n H 2 O were obtained. X-ray powder diffraction data show that these two phases crystallize with monoclinic symmetry. T…
A crystal surface which is miscut with respect to a high symmetry plane exhibits steps with a characteristic distance. It is argued that the continuum description of growth on such a surface, when desorption can be neglected, is given by the anisotropic version of the conserved KPZ equation (T. Sun, H. Guo, and M. Gra…
Four cobalt porphyrins were adsorbed on graphite electrodes and used to catalyze the electroreduction of O 2 . The two porphyrins without substituent groups in the meso positions of the porphyrin ring operated at the most positive potentials and catalyzed the reduction of O 2 to both H 2 O 2 and H 2 O, but the H 2 O d…
The properties of nanostructured plastics are determined by complex relationships between the type and size of the nanoreinforcement, the interface, and the chemical interaction between the nanoreinforcement and the polymeric chain, along with macroscopic processing and microstructural effects. Recently, families of m…
Thin-film BaTiO 3 has been prepared for the first time by spray pyrolysis. Both smooth and highly porous films were deposited depending on deposition temperature and rate. As-deposited films contained an unidentified, low-symmetry barium titanate modification. Annealing at 500−900 °C converted the films to the cubic p…
Optical Kerr effect spectroscopy has been used to monitor the orientational dynamics of acetonitrile in the bulk and confined in nanoporous silicate glasses. While the orientational decay in the bulk liquid is described by a single exponential, the confined liquid decays are best described by the sum of three exponent…