Materials Literature
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Injuries to ligaments in the knee are common in sports and other physical activities. Some clinical methods are available for qualitatively evaluating the degree of ligament injury and healing. It is, however, desirable to objectively assess the healing of ligaments and to predicate optimal treatment on quantitative m…
Pyroelectric properties of a bismuth layer-structured ferroelectric (BLSF) family are studied on ordinarily fired (OF) (nonoriented) and grain-oriented ceramics for pyrosensor materials. The pyroelectric figure of merit, Fv and FD , are evaluated from the measured values of the pyroelectric coefficient, p, the dielect…
Ferroelastic phase transitions and phase transitions involving coupling between the driving order parameter and elastic degrees of freedom (i.e. co-elastic phase transitions) follow empirically a Landau-type mean field behaviour over large temperature intervals. At temperatures close to the transition point the upper…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of poly(ethylene oxide) crystallization from solution: temperature and molecular weight dependenceNi Ding and Eric J. AmisCite this: Macromolecules 1991, 24, 13, 3906–3914Publication Date (Print):June 1, 1991Publication History Published online1 May 2002Published in…
Small-angle neutron scattering has been performed on lysozyme solutions at different concentrations, both at the Intense Spallation Impulsed Source (ISIS), Rutherford-Appleton Laboratory) and at Orph\'ee (Laboratoire Leon Brillouin). The results show that, in addition to the large-scale structural properties revealed…
Reflection electron microscopy (REM) has been applied to image the surface structures of polished natural diamond (001) faces before and after frictional sliding. Friction tracks produced by a diamond stylus sliding at a nominal contact pressure of a few GPa can be clearly seen in REM images of the surface. The contac…
Abstract De-intercalation of DMSO from well-crystallised kaolinites induced disorder. SEM, XRD and low-temperature IR were used to probe changes in morphology, layer stacking, and the environment of OH groups, respectively. The degree and type of disorder depended on the starting material and on the method of removing…
We have studied the optical properties of GaAs partially amorphized by As+-ion implantation. The model used is based on the two-phase mixture Bruggeman effective-medium approximation in which the partially amorphized layer is assumed as a physical mixture of fully amorphous GaAs and crystalline GaAs. The dielectric fu…
Abstract Surface‐enhanced Raman scattering (SERS) of α‐toluenethiol adsorbed on a silver surface has been investigated. The controversial vibrational assignment of the molecule was refined by comparing the SERS spectra with the ordinary Raman spectra of α‐toluenethiol, α‐toluenethiolate, benzyl chloride and their deut…
Abstract The crystal orientation of solid‐state biaxially drawn solution‐crystallized ultra‐high‐molecular weight polyethylene (UHMW‐PE) film has been revealed from flat‐plate wide‐angle x‐ray scattering (WAXS) patterns and interpreted in terms of crystal plasticity. A slightly drawn film (λ ≤ 3 × 3) possesses only a…
The Cahn-Hilliard theory of phase separation by spinodal decomposition has been extended to include hydrodynamics caused by surface tension. Numerical solutions for phase separation in binary polymer mixtures in two spatial dimension are presented. The surface tension influences the growth rate of the average domain s…
Pipe diffusion along a dissociated edge dislocation in copper is investigated by molecular dynamics simulation. The formation energies of a vacancy and an interstitial in the cores and the fault ribbon are calculated by quasi-dynamics relaxation at 0 K. The diffusion rates of these defects are calculated at high tempe…
Abstract Polyether sulfones containing perfluoroalkyl segments were prepared by room temperature radical‐cation polymerization (Scholl reaction) of 1,4‐bis[4‐(1‐napthoxy)phenylsulfonyl]perfluorobutane ( 1a ) and 1,8‐bis [4‐(1‐napthoxy) phenylsulfonyl] perfluoroctane ( 1b ) in nitrobenzene, using anhydrous ferric chlor…
Stannous fluoride (SnF2) has been shown to be an effective caries preventive agent. After topical treatment of enamel surfaces, two reaction products have been demonstrated to precipitate on the surfaces, a larger type of globules, probably a calcium fluoride like product, and a smaller type of globules, probably a ti…
Abstract Diffuse reflectance infrared (IR) spectra show that pressing kaolinite into pellets for transmission IR studies changes relative intensities of hydroxyl peaks between 3700–3600 cm -1 . The magnitude of change depends on the absolute pressure, the pressing time and whether a salt matrix is used. Pressing with…
Millions ofAmericans have some form of arthritis. The cumulative effects of aging can further negatively affect clothing dressing ease and the self-image of arthritics and elderly individuals. This research addressed clothing problems and solutions of nearly 800 Arizona residents with either rheumatoid arthritis or os…
Abstract The existing sets of additive electronic polarizabilities for alkali halides and alkaline earth chalcogenides are examined by evaluating the high frequency electronic dielectric constants and presenting a comparison with experimental data. The crystalline state values of polarizabilities are also compared wit…
Abstract The new brownmillerite‐related compound, LaSrCuGaO 5 , has been synthesized and characterized. It crystallizes in the orthorhombic non‐centrosymmetric space group Ima2. The unit cell dimensions are a = 16.383(1) Å, b = 5.5293(7) Å, c = 5.3275(6) Å. The structure is related to perovskite but contains ordered o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKeto-enol tautomerization in metal-acyl complexes: the enolization properties of bimetallic .mu.-malonyl compoundsJoseph M. O'Connor, Roger Uhrhammer, Arnold L. Rheingold, and Dean M. RoddickCite this: J. Am. Chem. Soc. 1991, 113, 12, 4530–4544Publication Date (Print):June 1…
Abstract The adsorption of aminotriazole, at its solution pH, with montmorillonite saturated with different cations has been studied. A pesticide-montmorillonite complex is formed through interlamellar cations which are not displaced. Aminotriazole is situated mostly as a polarized molecule around Mg 2+ and Zn 2+ cati…