Materials Literature
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Disposal of worn out tyres and other rubber-based products is a global problem. They are not biodegradable. Since they are crosslinked, they can not be recycled like thermoplastics. Keeping the environmental and economic factors in mind, it is envisaged that the disposal problem could be solved by incorporating ground…
Extended x-ray absorption fine structure and near-edge x-ray absorption fine structure techniques are employed to investigate the local structure and valency about Fe atoms in the diluted magnetic alloy semiconductor system ${\mathrm{Ga}}_{1\ensuremath{-}x}{\mathrm{Fe}}_{x}\mathrm{As}$ prepared by molecular-beam epita…
d-3-Phosphoglycerate dehydrogenase from Escherichia coli contains two Gly-Gly sequences that occur at junctions between domains. A previous study (Grant, G. A., Xu, X. L., and Hu, Z. (2000) Biochemistry 39, 7316-7319) determined that the Gly-Gly sequence at the junction between the regulatory and substrate binding dom…
The specific heat in the normal and superconducting states of single-crystal intercalation compounds of the host material 2H−TaS 2 was measured from 1.7 to 9 K by use of a thermal relaxation method. By studying two extreme cases of charge transfer n, namely the 9 Å methylene blue intercalation compound (9 Å MB + −TaS…
Controlled rate thermal analysis (CRTA) has been used to separate adsorbed formamide from intercalated formamide in formamide-intercalated kaolinites. This separation is achieved by removal of the sample at the end of the controlled isothermal desorption step. The temperature of this isothermal desorption is dependent…
A model is developed to describe the formation of metallic foams in which liquid drainage acts to collapse the foam before it can freeze. Numerical solution of the foam drainage equation, combined with the equations of heat conduction, provides new insight into the competition between these two processes. It also stim…
We study the ferroelectric system consisting of the sandwich structure (PbTiO3/BaTiO3/PbTiO3) by using the Ginzburg–Landau phenomenological theory, and emphasize the importance of the long-range coupling interaction to the ferroelectric behavior of the system. We find that after introducing the long-range coupling int…
Abstract Square planar [CuN4] copper(II) complexes, Rb2[Cu(succim)4]•2H2O (1), trans-[CuL2(R-chea)(S-chea)] (2), trans-[CuL2(R-chea)2] (3), (succim = succinimidate, L = 5,5-diphenylhydantoinate, and chea = 1-cyclohexylethylamine) were prepared and crystal structures were determined. Crystal data for 1 are monoclinic w…
When gas-filled microbubbles flow into an ultrasonic wavefield, the microbubbles interact with the ultrasonic waves and aggregate into large masses of bubbles. Those bubbles are trapped against the surrounding liquid flow by ultrasonic waves. In this paper, the microbubble trapping by an ultrasonic wavefield are discu…
Color generation in a typical liquid crystal device (LCD) is usually done via an array of absorptive color filters placed over the LC subpixels. These filters offer at best 33% transmission resulting in dark displays and the need for high intensity backlights. In this paper we clearly explain a new method of color gen…
Abstract Different procedures for preparing thermoplastic vulcanizates (TPVs), based on isotactic polypropylene (iPP) and ethylene—propylene—diene terpolymer rubber (EPDM), are used and analyzed in this work. In order to determine the effect of the vulcanization method on material properties, a rheological study, dyna…
Isothermal crystallization of a low-molecular-weight poly(ethylene oxide) from both isotropic and structured melts at low undercoolings has been investigated via simultaneous measurements of small angle and wide angle X-ray scatterings (SAXS and WAXS). An evolution of the SAXS pattern was observed prior to the appeara…
In the proposed experiment, the maximum amount of cadmium substitution in lead hydroxyapatite accounts for about 30 atom-%. The crystal structures of PbHA at different degrees of cadmium substitution for lead (4.9, 10.0, 22.4 and 29.0% Cd atoms) have been investigated by X-ray powder pattern fitting and 31P MAS NMR. T…
The crystal structure analysis of model organogallium amine-alkoxides Me2Ga(OCH2CH2CH2NH2) (2) and [Me2Ga{μ-OCH2CH(CH3)NH2}]2 (3), demonstrate how hydrogen bonding can effectively compete with metal−ligand coordination preferences in determining the molecular and crystal structure and how conformational changes in a l…
The nonlinear optical quantities, second and third harmonics (beta and gamma), were predicted using a quantitative structure-property relationship (QSPR) approach. Molecular orbital ab initio calculations were applied to generate easily accessible variables to be used in the partial least-squares analysis. Simplified…
Creep and dynamic mechanical measurements were carried out on a series of hyperbranched polyisobutylenes ~PIBs!, having a range of molecular weights (> 106 daltons! and branching frequencies ~3–57 branches/molecule!. For all samples, the molecular weight of the branches was higher than the entanglement molecula…
Polyrotaxanes, in which different numbers of β-cyclodextrins (β-CDs) were threaded on the triblock copolymer of poly(ethylene glycol) (PEG) and poly(propylene glycol) (PPG) capped with fluorescein-4-isothiocyanate (FITC), were prepared, and their solution properties under alkaline conditions were characterized in term…
A high-pressure high-temperature diamond based sensor has been developed for the use in diamond anvil cells. The electronic structure of the sensor is that of p–i–p unipolar diode with boron doped p-type regions separated by an i-region containing compensated boron acceptors. The sensor has been fabricated by high-tem…
Micromachined high aspect ratio field emitter areas have been realized to obtain stabile and uniform emission current. Dry etching based on gas chopping method was used to etch the 42-μm-high ultra-sharp emitter tips in single-crystal silicon. Diamond-like carbon (DLC) films of 25–100 nm thickness were deposited from…
Cholesteric liquid crystals (CLCs) may selectively reflect light when the helicoidal pitch is of the order of the wavelength of the incident beam propagating along the helix axis. The reflection bandwidth is dependent on the birefringence and is limited to a few tens of nanometers, which is insufficient for applicatio…