Materials Literature
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Al 2 O 3 and SiC composite materials have been produced from mixtures of aluminosilicates (both natural minerals and synthetic) and carbon as precursor materials. These composites are produced by heating a mixture of kaolinite (or synthetic aluminosilicates) and carbon in stoichiometric proportion above 1550°C, so tha…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExperimental and theoretical analysis of band formation in polymeric liquid crystals upon cessation of flowS. J. Picken, P. Moldenaers, S. Berghmans, and J. MewisCite this: Macromolecules 1992, 25, 18, 4759–4767Publication Date (Print):August 1, 1992Publication History Publi…
Abstract Novel biodegradable poly(ester‐amide)s were prepared by ring‐opening copolymerization of ε‐caprolactone and 3‐ and/or 6‐alkyl‐substituted morpholine‐2,5‐dione derivatives. The copolymerizations were carried out in the bulk using stannous octoate as an initiator. Molecular weights of the copolymers ranged from…
The external complex ac susceptibility ${\mathrm{\ensuremath{\chi}}}_{\mathrm{e}}$=${\mathrm{\ensuremath{\chi}}}_{\mathrm{e}}^{\ensuremath{'}}$-j${\mathrm{\ensuremath{\chi}}}_{\mathrm{e}}^{\mathrm{\ensuremath{''}}}$ of a spherical ${\mathrm{Nd}}_{2}$${\mathrm{Fe}}_{14}$B single crystal has been measured as a function…
N-Isopropylacrylamide (NIPAAM) was copolymerized with small quantities of 9-fluorenylmethyl acrylate to yield labeled poly(N-isopropylacrylamide) (PNIPAAM) for use in nonradiative energy transfer (NRET) experiments with various pyrene derivatives in aqueous solution. Microcalorimetry and cloud point measurements of th…
Etching rates of borosilicate, borophosphosilicate, phosphosilicate, and arsenosilicate glass films in various buffered hydrogen fluoride solution (BHF) have been studied. Etching rates were found to depend on the glass composition and dopant concentration as well as the concentration of ammonium fluoride in the BHF.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe role of chemical potential in the adsorption of lysozyme at the air-water interfaceShuqian Xu and Srinivasan DamodaranCite this: Langmuir 1992, 8, 8, 2021–2027Publication Date (Print):August 1, 1992Publication History Published online1 May 2002Published inissue 1 August…
The sintering behavior of fine AIN powder synthesized from an aluminum polynuclear complex was investigated. The focus of this work was to investigate the densification behavior of the AIN powder with different particle sizes (specific surface area: 3.2–22.8 m 2 /g). The AIN powder was synthesized from basic aluminum…
The lattice cluster theory with structured monomers is used to analyze the small angle neutron scattering experiments of Russell et al. on the polystyrene–b-poly(methyl methacrylate) diblock copolymer system in order to gain insight into the observed large entropic contribution to the effective interaction parameter χ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPlant Metabolites. New Sesquiterpene and Ionone Glycosides from Eriobotrya japonicaNunziatina De Tommasi, Rita Aquino, Francesco De Simone, and Cosimo PizzaCite this: J. Nat. Prod. 1992, 55, 8, 1025–1032Publication Date (Print):August 1, 1992Publication History Published onl…
Human carcinoma cells (NHIK 3025 cells) and Chinese hamster cells (V79 cells) were incubated with AlPcS1, AlPcS2 and AlPcS4, phthalocyanines with different lipophilicity but with similar photochemical properties when in monomeric solutions. The absorption- and fluorescence spectra of the dyes in the cells were recorde…
Abstract The influence of strain rate changes in the range from 10 −3 to 10 −6 1/s on the zero‐to‐tension loading and unloading behavior as well as short term relaxation properties is investigated using cylindrical specimens of circular cross section. A clip‐on extensometer measures and controls the axial strain in an…
The mesophase to crystal phase transition observed upon heating the monotropic liquid crystal polyurethane (2,6-LCPU-6), based on the mesogenic biphenol4,4'-bis(6-hydroxyhexoxy)biphenyl (BHHBP) and 2,6-tolylene diisocyanate (2,6-TDI), has been investigated by differential scanning calorimetry (DSC), wide-angle X-ray s…
Temperature dependence of hardness and expansion in icosahedral Al 72 Pd 20 Mn 8 alloy ( i -AlPdMn) are examined in comparison with a cubic Al 60 Pd 25 Mn 15 alloy ( c -AlPdMn). The hardness at room temperature is about 780 kg/mm 2 for i -AlPdMn, much greater than that for c -AlPdMn of 420 kg/mm 2 , and decreases to a…
Abstract Time-of-flight (TOP) neutron diffraction experiments have been carried out for pure liquid D2O and concentrated aqueous deuterochloric acid solutions (DCl)x(D2O)1−x (x = 0.10, 0.23). The errors due to the inelasticity effect on the molecular structure in the solution were markedly reduced by the TOF measureme…
The dielectric properties of mica-type silicates and layered double hydroxides have been studied in the pristine and various intercalated forms in the frequency range 101–107 Hz. A relaxation peak has been observed for the pristine silicate, whereas the pristine layered double hydroxide exhibits an anomalous low-frequ…
Abstract A free‐volume theory is developed for the analysis of Fickian diffusion processes in glassy polymers. Equations are presented for the prediction of mutual diffusion coefficients in concentrated glassy polymer‐penetrant systems. The concentration dependence of the mutual diffusion coefficient is dependent on h…
The effect of processing and material parameters on the sintering and coarsening of model composites consisting of a fine‐grained ZnO matrix and coarse, rigid, inert particulate inclusions of ZrO 2 was investigated. The green composites were formed by two methods: (i) mixing the matrix and inclusion powders in a ball‐…
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Effects of vacuum annealing and dry oxidation on the photoluminescence properties of porous Si are reported. Anodized porous Si is formed by electrochemical etching in an aqueous HF solution of 16 to 48 wt% with a current density of 10 to 70 mA/cm 2 . A subsequent vacuum annealing (from 400°C to 800°C) weakens the int…