Materials Literature
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This review considers the present state of the design of spectacle lenses with respect to minimizing the side effects that are associated with their wear. Topics include spherical lens design, aspheric lens design, progressive addition lenses, spectacle lens materials, assumptions of conventional lens design, and prac…
Abstract Mixtures of maleimidomethylated polystyrene with difurfuryl adipate or with furfuryl alcohol‐esterified poly[styrene‐co‐(maleic anhydride)] underwent thermally reversible Diels–Alder crosslinking. Reversal of crosslinking occurred rapidly at 150°C. The instability of the furfuryl group, however, limits the pr…
Calculated X‐ray diffraction pattern data for diamond polytypes are presented, which provides the required parameters for the characterization of the proposed diamond polytypes. The literature on diamond polytypes contains some small but significant errors with respect to the details of the crystal structure, includin…
With the new generation of high energy resolution and high intensity XPS spectrometers now commercially available, several novel aspects of the XPS of organic polymers have become apparent. These include observations on the symmetry and width of core line components, effects resulting from the overlap of shake-up and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChiral organosilicon compounds in asymmetric synthesisT. H. Chan and D. WangCite this: Chem. Rev. 1992, 92, 5, 995–1006Publication Date (Print):July 1, 1992Publication History Published online1 May 2002Published inissue 1 July 1992https://pubs.acs.org/doi/10.1021/cr00013a012…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVanadium phosphate (V2(PO4)3): a novel NASICO N-type vanadium phosphate synthesized by oxidative deintercalation of sodium from sodium vanadium phosphate (Na3V2(PO4)3)J. Gopalakrishnan and K. Kasthuri RanganCite this: Chem. Mater. 1992, 4, 4, 745–747Publication Date (Print):…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrothermal synthesis of tetragonal barium titanate (BaTiO3)Prabir K. Dutta and J. R. GreggCite this: Chem. Mater. 1992, 4, 4, 843–846Publication Date (Print):July 1, 1992Publication History Published online1 May 2002Published inissue 1 July 1992https://pubs.acs.org/doi/10.…
Abstract L ‐Lactide was polymerized with stannous 2‐ethylhexanoate (stannous octoate) in the presence of pentaerythritol to investigate multifunctional initiation. The prepared oligomers contain starshaped 4‐arm molecules when the mole ratio of [lactide]/[pentaerythritol] is above 32. The molecular weight of oligomers…
The thermal evolution of amorphous TiO 2 powders, consisting of spherical particles and prepared by hydrolysis of a titanium ethoxide aerosol, was studied by using Raman spectroscopy. On calcination at 350°C, the solid crystallized, giving anatase as a major phase. A small amount of rutile was also detected and attrib…
$^{7}\mathrm{Li}$ nuclear spin-lattice relaxation rates (${\mathit{R}}_{1}$) versus the temperature at several resonance frequencies (4 to 40 MHz) are reported together with the conductivity measurements, \ensuremath{\sigma}(\ensuremath{\omega}), in the range 1 Hz to 3.76 MHz on 0.${56\mathrm{L}\mathrm{i}}_{2}$S+0.${4…
We have analyzed an Ising-like model, in the mean-field approach, involving two “antiferromagnetically” coupled sublattices. This model simulates the so-called “two-step” spin-crossover transition, for which a precise definition is given. If both sublattices are equivalent, it implies a spontaneous breaking of symmetr…
Grafted polymer layers under variable solvent conditions are studied by Monte Carlo simulations using the bond fluctuation model. Structural information such as monomer density profiles, brush thickness, mean-square displacement of monomers, and positions of the monomers along the chain are obtained for temperatures a…
The physical and chemical phenomena responsible for the atmospheric corrosion of silver are presented. Corrosion layer formation, morphology, and chemical makeup are discussed in the context of silver‐containing minerals and other crystalline structures that thermodynamics and kinetics suggest are likely to be present…
We have studied the stoichiometric (annealed in oxygen), the slightly oxygen-deficient (annealed in vacuum), and the highly defective (sputtered with Ar+) TiO2(110) surfaces and their reactivities to molecular oxygen, molecular water, and 50-eV hydrogen ions using x-ray photoelectron spectroscopy (XPS) and low-energy…
Polymers, tensides, liquid crystals, and colloids have always stood at the forefront of Pierre‐Gilles de Gennes's interests. He obtained the Nobel Prize for Physics in 1991, and his Nobel lecture is a “sentimental journey in the wonderland of soft matter”, which is what he calls complex fluids. In his contribution, de…
A new cavity model that can explain the interaction between viscous effects including vortices and cavitation bubbles is presented in this study. This model, which is named a bubble two-phase flow (BTF) model, treats the inside and outside of a cavity as one continuum by regarding the cavity as a compressible viscous…
Photopolymerization of polymer-coated solid substrates with linearly polarized light is shown to induce an anisotropic, uniaxial orientation of polymer molecules. The linearly photopolymerized (LPP) layers exhibit UV dichroism and optical anisotropy. The resulting anisotropic dispersive surface interaction forces are…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” opt…
A consistent picture of the evolution of the defect structure is presented for a solid undergoing plastic deformation, when defects are multiplied and arbitrary hierarchical structures are formed. The complete problem is reduced to a description of the kinetics of the formation of a new structural level of plastic def…
Abstract This paper is concerned with the problem of modelling the motion of a bubble close to a rigid structure in an infinite fluid. It is well known that the boundary integral method is a powerful technique for modelling the motion of a single bubble in a fluid. In this paper we shall present a modified boundary in…