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 the measurement time is short. However, if the cell gap is not uniform, a significant error occurs due to a shift of the measurement point. This shift is caused by refraction at the glass…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemical and Chemical Polymerization of Imidazole and Some of Its DerivativesHsing Lin Wang, Rebecca M. O'Malley, and Jack E. FernandezCite this: Macromolecules 1994, 27, 4, 893–901Publication Date (Print):February 1, 1994Publication History Published online1 May 2002…
Abstract A series of trichlorogermanate(II) salts (AGeCl 3 , A = Rb, Cs, CH 3 N H 3 , and (CH 3 ) 4 N) have been synthesized and characterized by 35 Cl NQR , 35 Cl NMR , AC conductivity, DTA, and X-ray diffraction techniques. In the temperature range studied two, two, five, and four phases were confirmed for the Rb, C…
Abstract Transmission electron microscopy and optical studies of thin films of isotactic polystyrene (iPS) and polyoxymethylene (POM) provide evidence for a distinction between crazing mechanisms in semicrystalline polymers above and below T g . In the latter temperature regime, deformation in iPS and POM crystallized…
Electrical and magnetic properties have been investigated for (BEDT-TTF)(TCNQ) which is composed of BEDT-TTF sheets and TCNQ columns. The metal-insulator transition temperature ${\mathit{T}}_{\mathrm{MI}}$, 330 K at ambient pressure, decreases down to 40 K by applying hydrostatic pressure, which may be ascribed to the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhase Transition of Cl--Intercalated Hydrotalcite-like Compound during Ion Exchange with PhosphatesAkira Ookubo, Kenta Ooi, Fumio Tani, and Hiromu HayashiCite this: Langmuir 1994, 10, 2, 407–411Publication Date (Print):February 1, 1994Publication History Published online1 Ma…
We have modeled single-atom radiation damage events in diamond by a molecular-dynamics simulation, using an empirical interatomic potential to describe the interaction between the atoms in diamond. We find that the damage threshold energy needed to displace a single atom is well above simple estimates based on the dia…
Bis(tert-butyldimethylsiloxy)- (7), bis(dimethylthexylsiloxy)- (8), bis(tri-n-hexylsiloxy)- (9), and bis(dimethyloctadecylsiloxy)silicon 2,3-naphthalocyanines (10) were prepared via substitution of the bis(hydroxy) precursor with the corresponding chlorosilane ligands and characterized by spectroscopic and combustion…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGrafting of Water-Soluble Chains onto a Polymer SurfaceEmiko Uchida, Yoshikimi Uyama, and Yoshito IkadaCite this: Langmuir 1994, 10, 2, 481–485Publication Date (Print):February 1, 1994Publication History Published online1 May 2002Published inissue 1 February 1994https://pubs…
Fluorite type HfO 2 and ZrO 2 solid solutions were prepared by doping with 8 to 14 mol% of Ho 2 O 3 and Y 2 O 3 , and their lattice parameters were determined. In both HfO 2 and ZrO 2 systems, the lattice parameters of the solid solutions containing Ho 2 0 3 were consistently greater than those containing the same amo…
Once capillary pressure and permeability are determined for saturations ranging from near zero to 100%, liquid transport related to both wicking and wetting behavior can be described by Darcy's equation. The purpose of the work reported here is to assess and develop experimental techniques that allow capillary pressur…
Photolysis of the azido complexes [Ph 3 PAuN 3 ] and [(dppe)Pd(N 3 ) 2 ] or [(Ph 3 P) 2 Pd(N 3 ) 2 ] in the presence of [Ph 3 PAuCl] affords the new heterodimetal clusters 1 and 2 , in which the twelve gold atoms form an icosahedron around a central Pd atom. These first icosahedral Au 12 clusters containing a heteroat…
Complexes of stoichiometry Fe( trzH )2( trz )X, where trzH is 1,2,4-triazole and X = BF4, ClO4, PF6, have been prepared. All three salts display temperature-induced singlet (1A1) ? quintet (5T2) transitions which are generally discontinuous and associated with a broad hysteresis loop. The salts are strongly thermochro…
The frequency response of a model mechanism for acceptor‐limited electrochemical polishing is investigated. The mechanism consists of charge‐transfer and surface‐reaction steps involving adsorbed intermediates in the absence of precipitate films with electropolishing resulting from mass‐transport limitations for a sol…
The quenching of the radiative ${\mathit{e}}^{\mathrm{\ensuremath{-}}\mathrm{\ensuremath{-}}}$${\mathit{h}}^{+}$ recombination in barium aluminoborate glass, x irradiated at 77 K, was investigated by EPR and thermoluminescence (TL) techniques as a function of an iron impurity concentration ranging from ${10}^{\mathrm{…
Commercial poly(viny1 chloride) (PVC) contains approximately 10% crystallinity. This relatively low level of order has a surprisingly significant effect on both its processing and properties. In this review, the nature of PVC crystallinity, which is very different from that found in more conventional crystalline polym…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLuminescence of Bi3+ in gallate garnetsM. Ilmer, B. C. Grabmaier, and G. BlasseCite this: Chem. Mater. 1994, 6, 2, 204–206Publication Date (Print):February 1, 1994Publication History Published online1 May 2002Published inissue 1 February 1994https://pubs.acs.org/doi/10.1021/…
The results of an analysis of thirteen different computer programs involving 11 participants from 10 countries on eight measured glow curves originating from LiF(TLD-100) have been compared. The programs use a shape of a single glow peak which varies from program to program. Generally speaking, the better the approxim…
Abstract Several important aspects relating to the mechanism of formation of protective Cr‐based oxide films on aluminum alloy 2024‐T3 generated from CrO 3 + NaF‐containing solutions were observed with electrochemical, AES and XPS measurements. Although the film deposition rate and surface composition were very much i…
This study examines the effect of transverse thickness on the in-plane thermal conductivity of single crystal, defect-free, thin metallic films. The imposed temperature gradient is along the film and the transport of thermal energy is predominantly due to free electron motion. The small size necessitates an evaluation…