Materials Literature
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To measure the pretilt angle in a liquid crystal cell, the crystal rotation method is commonly used because it is very precise and measurements can be obtained rapidly. However when a liquid crystal cell with insufficient uniformity of the cell gap is used, a significant error occurs due to a shift in the measurement…
Abstract Bioabsorbable composites were fabricated from poly(D, L‐lactide‐urethane) matrix reinforced with poly(glycolic acid) (DEXON) surgical mesh. The crosslinked polyurethane matrix was formed from the reaction of ethy1–2, 6‐diisocyanatohexanoate and poly (D, L‐lactide) triol, initiated from glycerol; the ultimate…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLiquid-crystalline order in mucusChristopher Viney, Anne E. Huber, and Pedro VerdugoCite this: Macromolecules 1993, 26, 4, 852–855Publication Date (Print):February 1, 1993Publication History Published online1 May 2002Published inissue 1 February 1993https://pubs.acs.org/doi/…
Transient charging currents in nematic liquid crystals have been measured with a single- and a double-voltage pulse technique to elucidate the role of impurity ions incorporated in the materials in the transient charging processes. In the single pulse experiment, a peak in the current transient is observed in the nema…
Polycrystalline samples of ${\mathrm{Sr}}_{\mathit{x}}$${\mathrm{NbO}}_{3}$ (0.75\ensuremath{\le}x\ensuremath{\le}0.90) have been successfully synthesized by a solid-state reaction technique using TiO as a reducing agent. Powder x-ray-diffraction analysis indicated that the samples with x\ensuremath{\ge}0.80 were sing…
An efficient bifunctional catalyst for the title reaction is cobalt tetra(hydroquinone)porphyrin 1. The oxidized form of 1 (shown right, R = hydroquinone) has one unit for the interaction with molecular O2, and another for the interaction with the Pd catalyst. Thus, electrons can be transferred rapidly from the Pd com…
It has been previously shown, by equilibrium denaturation, that human growth hormone (hGH) folds by a cooperative two-state process. This is in contrast to the folding pathways of other nonhuman growth hormones that contain stable monomeric and multimeric equilibrium intermediates. We have reinvestigated the equilibri…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic states of bis(phthalocyaninato)lutetium radical and its related compounds: the application of localized orbital basis set to open-shell phthalocyanine dimersNaoto Ishikawa, Osamu Ohno, and Youkoh KaizuCite this: J. Phys. Chem. 1993, 97, 5, 1004–1010Publication Dat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNonlinear optical analysis of a series of triblock copolymers containing model polyenes: the dependence of hyperpolarizability on conjugation lengthG. S. W. Craig, R. E. Cohen, R. R. Schrock, R. J. Silbey, G. Puccetti, I. Ledoux, and J. ZyssCite this: J. Am. Chem. Soc. 1993,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAlkali halide nanocrystalsRobert L. WhettenCite this: Acc. Chem. Res. 1993, 26, 2, 49–56Publication Date (Print):February 1, 1993Publication History Published online1 May 2002Published inissue 1 February 1993https://pubs.acs.org/doi/10.1021/ar00026a003https://doi.org/10.1021…
The fracture characteristics of an Al 2 O 3 /Al composite are examined. Measurements of resistance curves and work of rupture are compared with predictions of a micromechanical model, incorporating the effects of crack bridging by the Al reinforcements. The bridging traction law is assumed to follow linear softening b…
The nonlinear optical properties of organo‐mineral salts based on 2‐amino‐5‐nitropyridine (2A5NP) and tartrate anions are presented. The mineral anion provides improved structural cohesion compared to van der Waals or hydrogen‐bonded organic molecular crystals while the organic species is responsible for the nonlinear…
The dynamics of a two-dimensional shell model with a double-well potential in the core-shell interaction is simulated by means of molecular-dynamics techniques. Snapshots of the lattice displacement pattern reveal the presence of precursor regions in the high-temperature phase, while in the low-temperature phase the d…
Electrical Conductivity, Defect Equilibrium and Oxygen Vacancy Diffusion Coefficient of La1 − x Ca x AlO3 − δ Single Crystals, Mizusaki, Junichiro, Yasuda, Isamu, Shimoyama, Jun‐ichi, Yamauchi, Shigeru, Fueki, Kazuo
OBJECTIVE: Perflubron emulsion is a bromine-based particulate contrast agent that is taken up selectively by the liver and spleen after IV injection. It does not leave the vascular space and also persists in the blood for a longer period than iodinated contrast agents do. We performed a preliminary study to determine…
A small-angle cleavage technique has been developed that produces superior transmission electron microscope (TEM) samples of semiconductors and related materials. The technique involves back-thinning the sample to approximately 100 microns, then scribing a groove on this back face at a specified small angle to a stand…
A quantitative investigation on the effects of plasma proteins and platelets on the adhesion of Staphylococcus epidermidis RP62A to a hydrophobic biomedical polymer (National Heart, Lung, and Blood Institute reference polyethylene) was carried out under well-defined shear conditions approximating human blood circulati…
The mechanism of red-pumped frequency-upconversion fluorescence observed in the uv and blue ranges of frequencies for a ${\mathrm{Tm}}^{3+}$-doped fluoroaluminate glass was investigated by single-wavelength pumping of a tunable 4-(dicyanomethylene)-2-methyl-6-(p-dimethyl-amino-styryl)-4H-pyran dye laser. It was found…
The binary collision code MARLOWE is used to study cascade sizes, defect densities and subcascade configurations in f.c.c., b.c.c. and h.c.p. metals as a function of recoil energy up to 1 MeV. The threshold energies for the formation of subcascades are determined using a definition based on the defect configuration af…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTParallel and perpendicular chain diffusion in a lamellar block copolymerM. C. Dalvi and T. P. LodgeCite this: Macromolecules 1993, 26, 4, 859–861Publication Date (Print):February 1, 1993Publication History Published online1 May 2002Published inissue 1 February 1993https://pu…