Materials Literature
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Molecular-dynamics simulation results are reported for systems of strongly interacting dipolar soft spheres. Calculations have been carried out along two isotherms and the structure of the liquid-crystal and solid phases obtained is described in detail. It is found that in addition to the ferroelectric nematic phase w…
Abstract HNBR rubbers, which are made by selective hydrogenation of the olefinic bonds of NBR rubbers, have been developed, because they show improved resistance towards heat and chemicals. In this study, two other properties are discussed that arise from the fact that HNBR rubbers are fairly alternating copolymers of…
Abstract Structural differences which occur on heating La-montmorillonite have been studied and compared with those for montmorillonite saturated with Na(I) and Li(I). Rehydration experiments show that La-montmorillonite swells after preheating up to 500°C. However, FT-IR spectra suggest partial migration of the La(II…
Both core level and valence band XPS spectra were obtained from an ultrahigh purity (UHP) graphite electrode surface. This UHP graphite had a very low oxygen content and an extremely low nitrogen content on its surface. It had a very graphitic structure in both the surface and the bulk as evidenced by XPS and XRD stud…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray structure analysis of a thermoplastic polyimideKenji Okuyama, Hisashi Sakaitani, and Hiroyuki ArikawaCite this: Macromolecules 1992, 25, 26, 7261–7267Publication Date (Print):December 1, 1992Publication History Published online1 May 2002Published inissue 1 December 199…
Abstract The surface composition of some halloysites with different particle morphology has been investigated by X-ray photoelectron spectroscopy (XPS) before and after removal of external Fe. The Fe(III) 2 p 3/2 binding energy of external Fe is appreciably smaller than that of structural Fe. Particle morphology is in…
The photoacoustic technique is used to investigate the thermal diffusivity of ${\mathrm{Ge}}_{\mathit{x}}$${\mathrm{Te}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$ glasses as a function of composition. The observed dependence on the composition is explained on the basis of the chemically ordered network model. This interpr…
Gallium, when bound to transferrin, has been previously shown to cause tumor cell cytotoxicity by preventing cellular uptake of transferrin bound iron in vitro. Patients treated with constant infusion gallium nitrate for carcinoma show a rise in serum iron within 6 hr of the start of treatment. Serum iron returns to b…
Adhesion of fluoropolymers to copper and to other polymers is examined using a range of fluoropolymer types (PTFE, PFA, extruded, skived and cast films), surface modification techniques such as sodium naphthalenide (Na/naphth), acid stripping and lamination to produce surfaces of controlled roughness, and three tests…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUltralow temperature dielectric relaxations in polyolefinsHoward W. Starkweather Jr., Peter Avakian, Robert R. Matheson Jr., John J. Fontanella, and Mary C. WintersgillCite this: Macromolecules 1992, 25, 25, 6871–6875Publication Date (Print):December 1, 1992Publication Histo…
The use of 13C NMR spectroscopy to study the biosynthesis, degradation and physical properties of polyhydroxyallkanoates (PHAs) is described. Solution-state NMR of whole cells allows direct observation of biosynthetic pathways within the cell and demonstrates that the bulk of the polymer is in a remarkably fluid, amor…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolution structure and conformational equilibria of a symmetrical calix[6]arene. Complete sequential and cyclostereospecific assignment of the low-temperature NMR spectra of a cycloasymmetric moleculeM. Antonia Molins, Pedro M. Nieto, Concha Sanchez, Pilar Prados, Javier De…
X-ray absorption spectroscopy is ideally suited for the investigation of the electronic structure and the local environment (approximately 5 A) of specific atoms in biomolecules. While the edge region provides information about the valence state of the absorbing atom, the chemical identity of neighboring atoms, and th…
Research of perovskite oxide catalysts (AB03) with a rare-earth ion as an A-site and a transition metal ion as a B-site has been concentrated on the complete oxidation of hydrocarbons, particularly related to exhaust control, and revealed that they are potential catalysts for deep combustion of hydrocarbons (1). The c…
Abstract Noncrystalline aluminosilicates termed allophane and imogolite are common constituents of spodosols, soils derived from volcanic ash, and many inceptisols. The surface charge characteristics of their synthetic analogues may be used to better understand their ion retention properties. In this study, we determi…
Abstract Polymer blends with enhanced properties and processability for specific applications are modified through the incorporation of a variety of additives. The performance of these additives is often difficult to predict from considerations of their known behavior in the separate blend constituents. This overview…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanism of the thermally induced gas-phase decomposition of silane: a revisitationM. A. Ring and H. E. O'NealCite this: J. Phys. Chem. 1992, 96, 26, 10848–10855Publication Date (Print):December 1, 1992Publication History Published online1 May 2002Published inissue 1 Decemb…
Spirulina maxima and Rhodopseudomonas palustris, which are known to be capable of synthesizing poly-β-hydroxybutyrate (PHB), were grown under different conditions in order to investigate the metabolic significance of PHB synthesis in phototrophic microorganisms. The intracellular concentration of PHB in S. maxima, gro…
Flavobacterium sp. strain KI725 harbors plasmid pOAD21, a derivative of nylon oligomer-degradative plasmid pOAD2, in which all of nylA (the gene for 6-aminohexanoate cyclic dimer hydrolase [EI]) was deleted but nylB (the gene for 6-aminohexanoate dimer hydrolase [EII]) was retained. KI725 showed no growth on unfractio…
Aluminum‐doped zinc oxide films prepared using a normal‐pressure CVD (NP‐CVD) method were studied as a transparent electrode material. The films were prepared on fused quartz substrates at 500°C using bis(2,4‐pentanedionato)zinc and tris(2,4‐pentanedionato)aluminum as source material. The transparent films, ∼0.3 μm in…