Materials Literature
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The low-frequency dielectric response of the surface stabilized ferroelectric liquid crystal (SSFLC) cells has been investigated. It was found that the dielectric response depends on the type of the smectic layer structure present and the cell thickness. An analytical solution to the equation of motion that describes…
Forming woven fabric composites into complex parts consisting of double curvature shells leads to complex redistribution and reorientation of fibers in the composite. The thermo-mechanical performance of the molded part is highly dependent on this rearrangement. Consequently, prediction of the properties of double cur…
A new approach for the theoretical description of structure formation in acoustic cavitation is developed. The model consists of two coupled partial differential equations describing the spatiotemporal evolution of the sound field amplitude and the bubble concentration. Linear stability analysis and numerical simulati…
Abstract In this study, n-alkyltrimethylammonium ions ([CnH2n+1N(CH3)3]+; n = 12,14,16,18) were intercalated in the interlayer space of layered sodium octosilicate (Na2Si8O17·nH2O) via an ion-exchange reaction. The interlayer space was further modified by grafting of the trimethylsilyl groups via a reaction between a…
We consider tilings of the plane by a lattice of translates of some compact set A such that the union of k suitably chosen tiles is similar to A. Affine and metric equivalence of such ‘k-reptiles’ are defined. We show that for every k ⩾ 2 there is a finite number of equivalence classes for which A is homeomorphic to a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOne Dimensional Inorganic Polymers: Synthesis and Structural Characterization of the Main Group Metal Polymers K2HgSnTe4, (Et4N)2HgSnTe4, (Ph4P)GeInTe4, and RbInTe2Sandeep S. Dhingra and Robert C. HaushalterCite this: Chem. Mater. 1994, 6, 12, 2376–2381Publication Date (Prin…
The serine protease (SSP) from a Gram-negative organism, Serratia marcescens, is excreted even from Escherichia coli. The protease is synthesized as a 1045-amino-acid precursor (preproSSP) composed of three functional portions, a typical NH2-terminal signal peptide of 27 amino acids, the mature protease part of 618 am…
The effect of a cryoprotectant (glycerol) upon the mosaicity of flash-frozen T-state glycogen phosphorylase b crystals has been investigated. Glycerol concentration in a buffered solution was varied between 0 and 70% v/v. The results show that there is a well defined optimum in glycerol concentration giving lowest mos…
The brittle‐to‐ductile transition (BDT) of Precracked sapphire in four‐point bending was studied as a function of orientation and strain rate from room temperature to 1500°C. Plastic deformatiom of sapphire occurs via basal and prismatic slip during loading at high temperature (above 1030–1100°C, depending on orientat…
It is well established that, within families of homologous enzymes, amino acid residues that are involved in the chemistry of the reaction are highly conserved. To determine if residues at the subunit interface of oligomeric enzymes with shared active sites are also conserved, comparative analysis of five enzyme famil…
Abstract Two new phenylethynyl endcapping compounds, 3‐ and 4‐amino‐4′‐phenylethynylbenzophenone, were synthesized and used to terminate imide oligomers from 3,4′‐oxydianiline and 4,4′‐oxydiphthalic anhydride at a calculated molecular weight of 9000 g/mol and from 3,4′‐oxydianiline (0.85 mol), 1,3‐bis (3‐aminophenoxy)…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReaction Kinetics of Epoxy/Amine Model Systems. The Effect of Electrophilicity of Amine MoleculeJovan Mijovic and Jony WijayaCite this: Macromolecules 1994, 27, 26, 7589–7600Publication Date (Print):December 1, 1994Publication History Published online1 May 2002Published inis…
A simple method for the preparation of isomorphous xenon derivatives is presented. A device has been designed that allows diffraction studies on protein crystals under xenon gas pressures up to 50 × 105 Pa. Crystal mounting and X-ray data collection do not significantly differ from standard techniques. Tests carried o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAttractive Inter- and Intramolecular N.cntdot..cntdot..cntdot.O Interactions in N,N-Dipicrylamine and Its Ionic ComplexesKrzysztof Wozniak, Heyong He, Jacek Klinowski, William Jones, and Eugeniusz GrechCite this: J. Phys. Chem. 1994, 98, 51, 13755–13765Publication Date (Prin…
Abstract An apparatus is described to measure interfacial tension for molten polymer pairs. The apparatus is based on the pendant drop method. A CCD color video camera captures the image of a pendant drop profile, which is analyzed on‐line using a microcomputer. These almost continuous measurements permit the detectio…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComplementary Shapes in Columnar Liquid Crystals: Structural Control in Homo- and Heteronuclear Bimetallic AssembliesAndre G. Serrette, Chung K. Lai, and Timothy M. SwagerCite this: Chem. Mater. 1994, 6, 12, 2252–2268Publication Date (Print):December 1, 1994Publication Histo…
The low-valent titanium induced reductive coupling of metal(II) 5-formyl-octaethylporphyrin (OEP) (2, 3) leads to the formation of ethene-bridged bisporphyrins. Structural studies on the main products of the coupling of Cu(II) (2) and Ni(II) 5-formyl-OEP (3) revealed, surprisingly, the formation of the cis-isomers 1,2…
Abstract A non‐invasive γ‐ray emission system, employing eight NaI detectors, has been developed to follow the motion of a single radioactive particle in a three‐dimensional spouted bed reactor. The count‐rates measured simultaneously by the detectors are converted into tracer coordinates (x, y, z) using a pre‐establi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAb Initio Studies of Neutral and Protonated Triglycines: Comparison of Calculated and Experimental Gas-Phase BasicityKui Zhang, Carolyn J. Cassady, and Alice Chung-PhillipsCite this: J. Am. Chem. Soc. 1994, 116, 25, 11512–11521Publication Date (Print):December 1, 1994Publica…
Abstract Interfacial tension is one of the most important parameters that govern the morphology of polymer blends and the quality of adhesion between polymers. However, few data are available on interfacial tension due to experimental difficulties. A pendant drop apparatus was used for the determination of the interfa…