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Quarterwave plates can be made as holographic gratings in positive photoresist. We studied the effect of the grating period and relief depth on the phase retardation and on the rotation of the polarization of the transmitted light. Experiments were performed with gratings of different periods, which also exhibit an an…
A high-angular-resolution two-circle powder diffractometer equipped with long diffracted-beam collimators has been built at Daresbury Laboratory. The diffractometer has encoders mounted directly on the 2θ and ω axes. These give a nominal angular resolution of 0.1 and 1.0 mdeg respectively. Repeated scans of single pow…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Wesley R. Burghardt, Gerald G. Fuller; Transient shear flow of nematic liquid crystals: Manifesta…
Mitochondrial NAD(H)-specific isocitrate dehydrogenase was purified from Saccharomyces cerevisiae for analyses of subunit structure and expression. Two subunits of the enzyme with different molecular weights (39,000 and 40,000) and slightly different isoelectric points were resolved by denaturing electrophoretic techn…
Energy stability theory has been applied to a basic state of thermocapillary convection occurring in a cylindrical half-zone of finite length to determine conditions under which the flow will be stable. Because of the finite length of the zone, the basic state must be determined numerically. Instead of obtaining stabi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMorphology control in electrochemically grown conducting polymer films. 1. Precoating the metal substrate with an organic monolayerIsrael Rubinstein, Judith Rishpon, Eyal Sabatani, Antonio Redondo, and Shimshon GottesfeldCite this: J. Am. Chem. Soc. 1990, 112, 16, 6135–6136P…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIsolated redox centers within microporous environments. 1. Cobalt-containing aluminophosphate molecular sieve fiveConsuelo. Montes, Mark E. Davis, Brendan. Murray, and Mysore. NarayanaCite this: J. Phys. Chem. 1990, 94, 16, 6425–6430Publication Date (Print):August 1, 1990Pub…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIsolated redox centers within microporous environments. 2. Vanadium-containing aluminophosphate molecular sieve fiveConsuelo. Montes, Mark E. Davis, Brendan. Murray, and Mysore. NarayanaCite this: J. Phys. Chem. 1990, 94, 16, 6431–6435Publication Date (Print):August 1, 1990P…
We present a detailed experimental characterization of an optical storage technique that uses monodomain films of liquid-crystalline polymers (LCP’s). This technique employs the trans–cis isomerization of cyanoazobenzene mesogenic groups of the LCP’s, which is photoinduced in the glassy state. Changes in the molecular…
The twist viscosity has been measured in a binary liquid-crystal mixture above the nematic--smectic-C transition near the nematic--smectic-A--smectic-C multicritical point using the dynamic Fr\'eedericksz deformation and found to exhibit a monotonic divergence. This study also shows that the splay elastic constant has…
The complex [Ni(12-aneN4)(OH2)2](ClO4)2·H2O (12-aneN4 = 1,4,7,10-tetraazacyclododecane) has been prepared and its structure determined. The complex crystallizes in the orthorhombic space group P212121 With a= 11.173(5), b = 11.976(5) and c = 13.969(4) Å. The volume of the unit cell is 1869(1) Å3. The total reflections…
Abstract The Sharma constant S o , the isochoric temperature coefficient of volume expansivity, the isochoric temperature coefficient of internal pressure, the reduced compressibility, the reduced volume and a few other acoustic parameters are evaluated for N‐(P‐Hexyloxybenzylidene)‐P‐Toluidine (HBT) using only the co…
Abstract Effects of counter cation on the anionic polymerization of N ‐phenylmaleimide ( N ‐PMI) were investigated with alkali metal tert ‐butoxides. N ‐PMI was more rapidly polymerized in the polymerization system with a larger size of counter cation (K + > Na + > Li + , e.g., 100% for K + , 20 min, and 2.7% fo…
A molecular dynamics experiment was designed to follow the sequence of depolymerization reactions occurring when a polymer degrades into its constituent monomers. This simulation addresses internal changes that certain materials undergo at the moment of burning. Polymer fragments were thermally generated from the rand…
<div class="htmlview paragraph">This paper describes experimental results obtained while operating three different diesel engines using fuels treated with a platinum organometallic fuel additive. Platinum group organometallics that are soluble and stable in hydrocarbons were used. The projected cost of the addit…
LEED fine structure features are due to an interference between the measured beam (usually the specular) and a pre-emergent beam. This pre-emergent beam is internally reflected at the surface potential barrier and is subsequently diffracted by the substrate into the same direction as the beam under observation. As a r…
Abstract The feasibility of transforming palygorskite from two localities to smectite hydrothermally at temperatures ranging from 22° to 160°C was investigated in a series of laboratory experiments, in which alkalinity was maintained in the pH range of 11.4 to 12 by adding NaOH. The smectite formed was characterized b…
Abstract Complexes [NiL2(H2O)X]X·nH2O (L=N,N-dimethyl-1,2-ethanediamine; n=0 when X=BF4; n=1 when X=Br; n=3 when X= Cl), [NiL2(H2O)Y]·nH2O (n=2 when Y= SeO4; n=5 when Y=SO4), [NiL2(H2O)2](NO3)2·H2O and [NiL2] (ClO4)2 have been synthesized and investigated thermally in the solid state. The complexes [NiL2(H2O)Cl]Cl·3H2…
The application of submicron grating structure for light trapping in thin silicon solar cells has been investigated theoretically and experimentally. A gain in absorption corresponding to an increase in thickness of more than a factor of 4 for polarized light and about 3 for unpolarized light has been demonstrated.
This paper is a review of already published work. Exciton-relaxation processes in organic solids are discussed. Pyrene and poly(phenylenevinylene) (PPV) crystals are investigated as two examples of strong exciton–phonon coupled systems. Free-exciton luminescence is observed simultaneously with self-trapped exciton lum…