Materials Literature
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A new series of optically active compounds have been prepared using 4,4″-terphenyldicarboxylic acid and S-2-alcoxypropanols-1. These are Sm*C, SmA and N* chemically stable - especially with regard to racemization and UV-light compounds with a small PS value, high twisting power and left handedness of helix.
A beamline for macromolecular crystallography has been designed for the ALS. The source will be a 37-pole wiggler with a 2-T on-axis peak field. The wiggler will illuminate three beamlines, each accepting 3 mrad of horizontal aperture. The central beamline will primarily be used for multiple-wavelength anomalous dispe…
Lyotropic micellar nematic and smectic phases observed in the mixture of sodium oleate and glacial acetic acid has been studied by X-ray and optical methods. It is found that a nematic phase is observed with small concentration of sodium oleate at higher temperatures. Smectic A and Smectic E phases also occur at lower…
The results of high hydrostatic pressure studies of martensitic transformations in alloys with special emphasis to shape memory alloys (SMA) are reviewed. Experimentally detected positive and negative signs of MS temperature pressure shift and phase p-T diagrams are discussed. High pressure induced shape memory effect…
Abstract The resonance Raman spectrum of bis(isomaleonitriledithiolato)nickelate(II) was investigated in order to assess the extent of the electronic delocalization within the chromophore. Previous results for the isomeric species bis(maleonitriledithiolato)nickelate(II) indicated an extensive delocalization involving…
A linear stability analysis of the undulatory instability of the nematic-isotropic (N-I) interface under a vertical magnetic field is presented. It is shown that the boundary conditions on the lower surface of the nematic layer have a very significant influence on the threshold characteristics. Furthermore, in the cas…
Results of generalized valence bond plus configuration interaction calculations for the potential curves and spectroscopic constants of the two lowest lying electronic states of the MgC molecule are presented. The <SUP>3</SUP>Σ<SUP>-</SUP> state was found to be the ground state but with the <SUP>5</SUP>Σ<SUP>-</SUP> s…
Hillock formation on Pt bottom electrode surfaces has been investigated for 〈111〉 Si and sapphire substrates. This paper correlates the electrical performance of Pt/PZT/Pt structured capacitors with the observed surface roughness and/or hillock presence on the Pt bottom electrode.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReassessment of Khazanovich's Theory of Thermal Diffusion of Polymers in SolutionMichael BenderCite this: Macromolecules 1995, 28, 4, 1309–1311Publication Date (Print):February 1, 1995Publication History Published online1 May 2002Published inissue 1 February 1995https://pubs…
The purpose of this presentation is to provide some perspective gained from recent studies in condensed matter physics on the microscopic processes by which martensitic transformations take place to supplement the highly developed crystallographic and thermodynamic descriptions. Atomic scale dynamics can be related to…
A simple method for the preparation of monophasic β‐SiAlON using nitridation of Si and AIN with an oxygen partial pressure of 10 ‐4 atm is described. The effect of the AIN/Si ratio in the initial mixture on the formation of β‐SiAlON is discussed. The likely mechanism of the formation of β‐SiAlON is outlined.
<div class="htmlview paragraph">The accuracy of an accident reconstruction is dependent upon the availability and quality of relevant data. Often by the time an engineer is asked to reconstruct a traffic accident the only source of scene data is a police report. Important scene data, such as the point of impact…
Abstract The local structure in crystals, melts, supercooled melts, and glasses of sodium silicate hydrates of composition Na 2 O · SiO 2 · nH 2 O (n = 9, 6, 5) is studied by variable temperature 1 H, 23 Na, and 29 Si MAS NMR spectroscopy. Detailed in situ investigations on the melting process of the crystalline mater…
Fichtelite, C 19 H 34 , is a saturated hydrocarbon mineral that is monoclinic, space group P2 1 , with a 10.706(4), b 7.458(2), c 10.824(7) Aa, beta 105.85(3) degrees , V 831.4(8) Aa 3 , Z = 2. Its structure was determined by direct methods using 1105 observed reflections [F> or =3sigma F ], with a full-matrix least-s…
We propose a 3-state spin model to simulate the martensitic transition (MT) between austenite (S = 0) and two different, twin-related, martensitic phases (S = &I).The system can be driven by two fields: A plays the role of temperature (drives the thermallyinduced transition) and H plays the role of an uniaxial stress.…
3,3′,4,4′-Biphenyltetracarboxylic dianhydride (BPDA) was investigated as the central core unit in mesogenic molecules. Of particular interest was whether the BPDA unit could be self-constrained into a trans-conformation, and thus organize into a liquid crystalline phase. Two homologous series of symmetrical substitute…
In this paper, results from static tests have been used to establish scale inhibitor adsorption mechanisms and levels in consolidated reservoir cores and to rank inhibitors for their adsorption behaviour and, in some cases, squeeze return lifetimes. The purpose of this rapid and simple type of bulk adsorption measurem…
The effect of three different electrolytes on the efficiency of polypyrrole deposition was studied using Rutherford backscattering spectrometry (RBS). The RBS results were used to determine the thickness, roughness, and composition of the polypyrrole films. The films were deposited from aqueous solutions of sodium per…
Icosahedral alloy Al86Cr8Fe6 and its crystallization products have been studied with X-ray diffraction, differential scanning calorimetry, 57Fe Mössbauer spectroscopy, and magnetic susceptibility methods. The presence of a multiplicity of Fe sites is demonstrated, and this is interpreted as evidence of intrinsic disor…
We present experimental studies of magnetization of Pb1x CrxTe (x < 0.01) crystals. The reasonable description of the data is obtained for a composition of x < 0.001 using Cr+++ model (Brillouin type paramagnetism S = 3/2).