Materials Literature
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Photocatalytic degradation of gaseous propionaldehyde over TiO 2 -loaded adsorbent films was investigated after adsorption equilibrium was obtained using silica, alumina, activated carbon, and several kinds of zeolites as adsorbents. Irradiation of one-tenth of the TiO 2 -loaded adsorbent film caused complete minerali…
Low-frequency dielectric properties were measured for study of the transport properties of impurity ions in nematic liquid crystal (NLC: 4-cyano-4'-pentyl biphenyl) cells with and without polyimide alignment layers. It was found that the dielectric behavior of the NLC cells without polyimide alignment layers is due to…
A model composed of the nonlinear Cahn−Hilliard and Flory−Huggins theories for spinodal decomposition (SD) and a second-order rate equation for polymerization for the self-condensation of a trifunctional monomer is used to study the polymerization-induced phase separation (PIPS) phenomena. The numerical results are co…
Hyperbranched aromatic polycarbonates were prepared by the polymerization of an A 2 B monomer derived from 1,1,1-tris(4‘-hydroxyphenyl)ethane. Protection of one of the three phenols of the triphenol by a tert -butyldimethylsilyl group was followed by conversion of the remaining two phenolic groups to carbonylimidazoli…
A photothermal microscope that provides micrometer lateral and submicrometer depth resolution was designed. Thermal conductivity measurements with modulation frequencies up to 12 MHz on single grains in polycrystalline diamond demonstrate its lateral resolution power even for a highly conducting material. Measured con…
The electro-optical behavior of polymer stabilized cholesteric texture cells has been investigated for three different polymers. The switching process was studied with respect to the electric field dependence of the diffuse reflectivity, diffuse transmittance, and the dynamics of the reorientation process. For certain…
Abstract A new model for the interpretation of dioctahedral mica infrared (IR) spectra in the OH stretching vibration region is proposed. It is based on the analysis of the main factors responsible for the observed sequence of the OH frequencies. In terms of this model, the simple analytical dependence between the OH…
Dynamic mechanical spectroscopy (DMS) is used to further investigate the recently observed order−disorder transition (ODT) in comblike block copolymers obtained by hydrogen bonding between poly(4-vinylpyridine) and pentadecylphenol (P4VP−PDP x ). For stoichiometric amounts of pyridine and phenol, i.e., x = 1.0, the OD…
Mechanical behavior of the Space Shuttle redesigned solid rocket motor (RSRM) propellant is studied from a phenomenological point of view. Motivated by the study of the experimental data three initially isotropic constitutive models have been developed. All models represent the effect of strain rate, superimposed hydr…
We present a review of some results concerning electronic transport properties of quasicrystals. After a short introduction to the basic concepts of quasiperiodicity, we consider the experimental transport properties of electrical conductivity with particular focus on the effect of temperature, magnetic field, and def…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSolid-Supported Hyperbranched Polymerization: Evidence for Self-Limited GrowthP. Bharathi and Jeffrey S. MooreView Author Information Roger Adams Laboratory, Departments of Chemistry and Materials Science & Engineering The Beckman Institute for Advanced Science and Tec…
A model is proposed to describe all experimental results on electrical aging of cables reported in Part 1. It is based on simple thermodynamics concepts in the Eyring theory, includes the concept of submicrocavity formation proposed by Zhurkov, and supposes that the first step in electrical aging is essentially a mole…
The photo-oxidative stability of various annelated and substituted tetraazaporphyrin derivatives were investigated in N , N -dimethylformamide by irradiation in the presence of air. First-order rate constants were calculated. In addition, the positions of the HOMO and LUMO energy levels of the compounds were calculate…
The evaporation of silicon carbide (SiC) ceramics during sintering has been studied by thermogravimetry in a graphite furnace filled with argon. The SiC powder compacts contained 7.5 wt% eutectic composition of Y 2 O 3 –Al 2 O 3 to promote liquid‐phase sintering. A weight loss of 1–11 wt% was observed during sintering…
Polycrystalline boron nitride (BN) films are synthesized using BCl 3 and N 2 as source gases, by plasma-assisted chemical vapor deposition. BN films consist of nanocrystalline grains of 3 nm in size. The energy gap is estimated to be 6.0 eV from ultraviolet-visible optical transmission measurement. The electrical resi…
Shape memory alloys (SMAs) have several unique characteristics, including their Young's modulus-temperature relations, shape memory effects, and damping characteristics. The Young's modulus of the high-temperature austenite of SMAs is about three to four times as large as that of low-temperature martensite. Therefore,…
Unidirectional elongation of magnetic field sensitive polymer gels, called ferrogels, have been studied. In ferrogels, finely distributed colloidal particles having superparamagnetic behavior are incorporated into a swollen network. These particles couple the shape of the gel to the nonuniform magnetic field. Shape di…
In its physiological solid state, type I collagen serves as a host for many types of cells. Only the molecules on fiber surface are available for interaction. In this interfacial environment, the conformation of a cell binding domain can be expected to fluctuate between the collagen fold and a distinctive non-collagen…
{5-[[[2‘,5‘-Bis[(4‘‘-( n -(perfluoroalkyl)alkoxy)benzoyl)oxy]benzyl]oxy]carbonyl]bicyclo[2.2.1]hept-2-ene}s were polymerized by ring-opening metathesis polymerization in THF at 40 °C using Mo(CHCMe 2 Ph)(N-2,6- i Pr 2 Ph)(O t Bu) 2 as the initiator. 2,5-Bis[(4‘-( n -(perfluoroalkyl)alkoxy)benzoyl)oxy]toluenes mimic bo…
A method to fabricate one dimensional nanoscale composite based on coating of carbon nanotube with metal is proposed and demonstrated in this letter. Carbon nanotubes have been coated with a layer of nickel by electroless plating. It was found that the nickel coating had a tendency to form as nanoparticles on the surf…