Materials Literature
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The infrared absorption spectra of a suite of twenty-one type Ib synthetic diamonds have been recorded, and the concentrations of nitrogen in the form of single substitutional N atoms in these specimens determined by electron spin resonance measurements. It is found that an absorption coefficient, at 1130 wave-numbers…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhenylacetylene Dendrimers by the Divergent, Convergent, and Double-Stage Convergent MethodsZhifu Xu, Michael Kahr, Kathleen L. Walker, Charles L. Wilkins, and Jeffrey S. MooreCite this: J. Am. Chem. Soc. 1994, 116, 11, 4537–4550Publication Date (Print):June 1, 1994Publicati…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and Properties of Highly Fluorinated PolyimidesG. Hougham, G. Tesoro, and J. ShawCite this: Macromolecules 1994, 27, 13, 3642–3649Publication Date (Print):June 1, 1994Publication History Published online1 May 2002Published inissue 1 June 1994https://pubs.acs.org/do…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNovel Synthetic Routes to Carbon-Nitrogen Thin FilmsJ. Kouvetakis, Michael Todd, Barry Wilkens, Anil Bandari, and Nigel CaveCite this: Chem. Mater. 1994, 6, 6, 811–814Publication Date (Print):June 1, 1994Publication History Published online1 May 2002Published inissue 1 June…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharged Polymeric Brushes: Structure and Scaling RelationsR. Israels, F. A. M. Leermakers, G. J. Fleer, and E. B. ZhulinaCite this: Macromolecules 1994, 27, 12, 3249–3261Publication Date (Print):June 1, 1994Publication History Published online1 May 2002Published inissue 1 Ju…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSilyl Cations in the Solid and in SolutionJoseph B. Lambert, Shizhong Zhang, and Sol M. CiroCite this: Organometallics 1994, 13, 6, 2430–2443Publication Date (Print):June 1, 1994Publication History Published online1 May 2002Published inissue 1 June 1994https://pubs.acs.org/d…
The nitrogen concentrations of a suite of thirteen purely type IaA diamonds have been determined by a destructive method involving combustion of the specimens and measurement, by capacitance manometry, of the released nitrogen. These values have been related to measurements of the infrared absorption strength due to n…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA Spectroscopic Characterization of the Reduction of Ceria from Electronic Transitions of Intrinsic Point DefectsClaude Binet, Ahmed Badri, and Jean-Claude LavalleyCite this: J. Phys. Chem. 1994, 98, 25, 6392–6398Publication Date (Print):June 1, 1994Publication History Publi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSelf-Assembly Motif for Creating Submicron Periodic Materials. Polymerized Crystalline Colloidal ArraysSanford A. Asher, John Holtz, Lei Liu, and Zhijun WuCite this: J. Am. Chem. Soc. 1994, 116, 11, 4997–4998Publication Date (Print):June 1, 1994Publication History Published…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSilver Clusters and Chemistry in ZeolitesTao Sun and Karl SeffCite this: Chem. Rev. 1994, 94, 4, 857–870Publication Date (Print):June 1, 1994Publication History Published online1 May 2002Published inissue 1 June 1994https://pubs.acs.org/doi/10.1021/cr00028a001https://doi.org…
Bioabsorbable polymer implants may provide a viable alternative to metal implants for internal fracture fixation. One of the potential difficulties with absorbable implants is the possible toxicity of the polymeric degradation products especially if they accumulate and become concentrated. Accordingly, material evalua…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrganic Diradicals and Polyradicals: From Spin Coupling to Magnetism?Andrzej RajcaCite this: Chem. Rev. 1994, 94, 4, 871–893Publication Date (Print):June 1, 1994Publication History Published online1 May 2002Published inissue 1 June 1994https://pubs.acs.org/doi/10.1021/cr0002…
The theory of phase-ordering dynamics, that is the growth of order through domain coarsening when a system is quenched from the homogeneous phase into a broken-symmetry phase, is reviewed, with the emphasis on recent developments. Interest will focus on the scaling regime that develops at long times after the quench.…
Abstract The continuous anionic polymerization of caprolactam to polyamide‐6 in a modular, intermeshing, corotating twin screw extruder was investigated. Caprolactam was polymerized by anionic polymerization techniques under a range of processing conditions, including different screw configurations, temperature profil…
Abstract The use of phosphorus for improving flame retardancy of natural rubber vulcanizates was attempted by incorporating a modified form of natural rubber. By reacting epoxidized liquid natural rubber (ELNR) with dibutylphosphate it was possible to chemically modify the polymer. On a 25% epoxidized LNR, 5.2–6.8% w/…
The results of the spectroscopic studies (IR absorption, spontaneous Raman scattering) on orthophosphates of Group I-III elements are presented. The characteristic features of the vibrational spectra and the influence of the characteristics of the crystal structure on such features are discussed. The bibliography incl…
Abstract Polyethylene composites filled with various types of carbon fiber were prepared for electrical and thermal conductivity measurements. By estimation of the anisotropic parameter (Hermans' parameter), the fibers were confirmed to be significantly biaxially oriented in the composites. The critical volume fractio…
Abstract The oxidative degradation of silicone rubber surfaces in air plasmas obtained by RF or corona discharges and the subsequent recovery process were studied by X‐ray photoelectron spectroscopy (XPS or ESCA). Using relatively short treatment times (5 min), the surface oxygen content was found to increase and that…
Inelastic neutron scattering has been employed to study the crystalline-electric-field interaction of the distorted perovskite PrGaO 3 . The observed energy spectra show several well defined inelastic peaks of magnetic origin in an energy transfer range up to 86 meV which are attributed to crystalline-electric-field t…
A novel technique to produce uniform alignment of nematic liquid crystals is presented. The technique is based on producing an anisotropic polymer network in the bulk nematic liquid crystal by polymerizing a photoresist material. Both uniform planar alignment and homeotropic alignment can be obtained depending on the…