Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOptical characterization of anodic aluminum oxide films containing electrochemically deposited metal particles. 1. Gold in phosphoric acid anodic aluminum oxide filmsCarolyn K. Preston and Martin MoskovitsCite this: J. Phys. Chem. 1993, 97, 32, 8495–8503Publication Date (Pri…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and characterization of colloidal silver-platinum alloysKanjiro Torigoe, Yoshifumi Nakajima, and Kunio EsumiCite this: J. Phys. Chem. 1993, 97, 31, 8304–8309Publication Date (Print):August 1, 1993Publication History Published online1 May 2002Published inissue 1 A…
Lutetium oxyorthosilicate Lu_2(SiO_4)O has two crystallographically independent lutetium sites. When it is doped with Ce, the dopant Ce is assumed to occupy two different sites, and thus the existence of two activation centers is proposed. UV and gamma-ray excited spectra clearly indicate that two activation centers e…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of hyperbranched polyurethanes prepared from blocked isocyanate monomers by step-growth polymerizationRalph Spindler and Jean M. J. FrechetCite this: Macromolecules 1993, 26, 18, 4809–4813Publication Date (Print):August 1, 1993Publication Histo…
A protein phosphatase (PPase) from the bacteriophage lambda was overexpressed in Escherichia coli. The recombinant enzyme was purified to homogeneity yielding approximately 17 mg of enzyme from a single liter of bacterial culture. Biochemical characterization of the enzyme showed that it required Mn2+ or Ni2+ as an ac…
When a constant metastable solution of the Cahn–Hilliard equation is subjected to a spatially localized large-amplitude perturbation, a transition process may be triggered leading to a globally stable stationary solution. In one space dimension, the existence and instability of a third stationary solution with the sam…
A new transition-state theory model has been proposed that is based on the concept that the dynamics of small molecules dissolved in dense polymers is coupled to the elastic thermal motion of dense polymers but can be treated separately from their structural relaxation. The model has been used to study the dynamics of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA molecular-dynamics study of polyethylene crystallizationT. A. Kavassalis and P. R. SundararajanCite this: Macromolecules 1993, 26, 16, 4144–4150Publication Date (Print):August 1, 1993Publication History Published online1 May 2002Published inissue 1 August 1993https://pubs.…
Explosive in the solid state, the bis(η2-peroxo) complex 1, which in solution is the active species in the epoxidation of olefins with [CH3ReO3], could be characterized by X-ray crystallography as the diglyme adduct 2. Under catalytic conditions (excess of H2O2), 1 is far more stable than in the free state.
Silicon nitride materials typically reveal thin amorphous intergranular films along grain boundaries, with only the exception of special boundaries. It is known that such grainboundary films strongly affect the high‐temperature properties of the bulk material. High‐resolution electron microscopy (HREM) was used to stu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBuilding-block synthesis of porphyrin light-harvesting arraysSreedharan Prathapan, Thomas E. Johnson, and Jonathan S. LindseyCite this: J. Am. Chem. Soc. 1993, 115, 16, 7519–7520Publication Date (Print):August 1, 1993Publication History Published online1 May 2002Published in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMonte Carlo studies of dendrimer macromoleculesMarc L. Mansfield and Leonid I. KlushinCite this: Macromolecules 1993, 26, 16, 4262–4268Publication Date (Print):August 1, 1993Publication History Published online1 May 2002Published inissue 1 August 1993https://pubs.acs.org/doi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAll-aromatic hyperbranched polyesters with phenol and acetate end groups: synthesis and characterizationS. Richard Turner, Brigitte I. Voit, and Thomas H. MoureyCite this: Macromolecules 1993, 26, 17, 4617–4623Publication Date (Print):August 1, 1993Publication History Publis…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, molecular structure, and reactivity of (alkylperoxo)copper(II) complexNobumasa Kitajima, Tsutomu Katayama, Kiyoshi Fujisawa, Yusaku Iwata, and Yoshihiko MorookaCite this: J. Am. Chem. Soc. 1993, 115, 17, 7872–7873Publication Date (Print):August 1, 1993Publication…
Abstract New classes of polymers and oligomers whose backbone consists of a network of delocalized π electrons have recently been synthesized and show electrical and non‐linear optical properties of great interest for new technologies. The vibrational spectra of these materials show peculiar features which, if properl…
This paper undertakes a parallel analysis of the gelation mechanisms, structure and rheological properties of gelatin and collagen gels. Although the molecular compositions of collagen and gelatin are almost identical, gelation proceeds from distinct mechanisms and leads to different types of molecular assemblies. Fir…
The electron density in synthetic calcite, CaCO3, has been determined using diffraction data for a naturally faced single crystal measured with X-ray Mo Ka (A = 0.71073/~) radiation. Extinction corrections that minimize differences between equivalent reflection intensities are closely approximated by the values which…
A range of nematogenic materials which incorporate a 2,6-disubstituted naphthyl moiety and a terminal cyano-substituent have been synthesized by using palladium-catalysed cross-coupling procedures involving arylboronic acids and alkynylzinc reagents with aryl iodides, bromides and trifluoromethanesulphonates (triflate…
The effects of plasticizers (polyethylene glycols [PEG] 400, 1,450, 8,000 and 20,000, glycerol [G] and propylene glycol [PG]), 30% dry basis, on the physical properties of methylcellulose (MC) films were investigated. With the exception of PG, plasticizers with low molecular weights (G and PEG 400) caused the largest…
An outline is presented of the first commercial environmental scanning electron microscope (ESEM). A concise description of this instrument and its operation, from a user's perspective, is given. More specifically, the description includes the electron optics, pressure stages and control, detection modes, resolution,…