Materials Literature
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We provide a statistical-mechanical theory for a system of free polymer molecules in a colloidal solution. It is shown that three-body terms are required to obtain the shape of the polymer and the depletion-layer profile even when the dispersion medium is a good solvent for the polymer molecule. A semiquantitative ana…
Aluminosilicates of three compositions with mullite as the major phase were synthesized by a sol‐gel process and characterized with bulk and microchemical analyses and microstructural observation. An apparatus for measuring the compressive creep up to 1900 K with a sensitivity of ±1 μm was constructed and used to meas…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn atomistic model of the amorphous glassy polycarbonate of 4,4-isopropylidenediphenolM. Hutnik, F. T. Gentile, P. J. Ludovice, U. W. Suter, and A. S. ArgonCite this: Macromolecules 1991, 24, 22, 5962–5969Publication Date (Print):October 1, 1991Publication History Published…
In order to approach the fascinating structure of the cubic mesophases, we study phase transitions involving them and another mesophases with simpler structures. In the first part, we give some results obtained in the C12EO6/water binary system, that exhibits the most frequent case of bicontinuous cubic mesophase, wit…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemical measurements of electron transfer rates through zirconium 1,2-ethanediylbis(phosphonate) multilayer films on gold electrodesHun Gi Hong and Thomas E. MalloukCite this: Langmuir 1991, 7, 10, 2362–2369Publication Date (Print):October 1, 1991Publication History…
Iontophoresis with gold, carbon, and platinum electrodes was shown to effectively reduce or eliminate gram-positive, gram-negative, and Candida albicans inocula in synthetic urine. Platinum and gold electrodes were more effective than carbon electrodes, but platinum showed the best longevity and may reduce or eliminat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIridescent phenomena and polymerization behaviors of amphiphilic monomers in lamellar liquid crystalline phaseKouichi Naitoh, Yasuo Ishii, and Kaoru TsujiiCite this: J. Phys. Chem. 1991, 95, 20, 7915–7918Publication Date (Print):October 1, 1991Publication History Published o…
The di-, tri-, and hexavacant lacunary tungstoarsenates α-[HAs 2 W 16 O 59 ] 11− , α-[As 2 W 15 O 56 ] 12− , and α-[H 2 As 2 W 12 O 48 ] 12− were prepared by controlled alkaline degradation of the Dawson-type anion α-[As 2 W 18 O 62 ] 6− . The relationships between all these anions and the two α-[As 2 W 17 O 61 ] 10−…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and properties of poly(quinolinediyl)s and poly(isoquinoline-1,4-diyl) with new π-conjugation systemsTakaki Kanbara, Nobuo Saito, Takakazu Yamamoto, and Kenji KubotaCite this: Macromolecules 1991, 24, 21, 5883–5885Publication Date (Print):October 1, 1991Publicati…
Observations with the polarizing microscope of defects in the lyotropic Lα(SmA) phase of the quasi-ternary system cetylpiridinium chloride/hexanol/brine give evidence that oily streaks are chains of focal conic domains. The chains are stable in the vicinity of the Lα-L3 phase transition. Such a model of oily streaks w…
Pyrolysis of preceramic polymer/metal powder composites resulted in formation of ceramic products containing the metal as well as element present in the polymer. Prepared in this manner were ceramics containing crystalline phases of metal silicides, metal carbides, metal nitrides, metal borides, and silicon carbide. T…
The interaction of ½<110> screw and 60° dislocations with symmetric [110] tilt boundaries was investigated by atomistic simulations using many-body potentials representing a pure f.c.c. metal and ordered intermetallic compounds. The calculations were performed with and without an applied shear stress. The observations…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA versatile transformation of vic-diols into .alpha.-hydroxy ketones with hydrogen peroxide catalyzed by peroxotungstophosphatesYasuyuki Sakata and Yasutaka IshiiCite this: J. Org. Chem. 1991, 56, 21, 6233–6235Publication Date (Print):October 1, 1991Publication History Publi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRoles of surface protonation on the photodynamic, catalytic, and other properties of polyoxometalates probed by the photochemical functionalization of alkanes. Implications for irradiated semiconductor metal oxidesRoman F. Renneke, Miryam Kadkhodayan, Marzia Pasquali, and Cr…
Experiments in which the disperson and flocculation behavior of aluminum oxide grains in a Ca‐Al‐Si‐O silicate liquid are examined have been used to determine the nature of the forces between oxide grains in a silicate melt. From observations of the way in which the melt penetrates grain boundaries in a high‐purity po…
Enzyme I, the first in the sequence of phosphocarrier proteins of the bacterial phosphoenolpyruvate:glycose phosphotransferase system, is a potential critical point for regulating sugar uptake. The thermal stability of Enzyme I was studied by high sensitivity differential scanning calorimetry. At pH 7.5, thermal unfol…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMononuclear manganese(IV) in tridentate ONO coordination. Synthesis, structure, and redox regulation via oxygen donor variationSomnath Dutta, Partha Basu, and Animesh ChakravortyCite this: Inorg. Chem. 1991, 30, 21, 4031–4037Publication Date (Print):October 1, 1991Publicatio…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCoil-globule transition of poly(N-isopropylacrylamide): a study of segment mobility by fluorescence depolarizationT. Binkert, J. Oberreich, M. Meewes, R. Nyffenegger, and J. RickaCite this: Macromolecules 1991, 24, 21, 5806–5810Publication Date (Print):October 1, 1991Publica…
Corona discharge has been widely used to modify polymer surfaces because it can be operated at an atmospheric pressure in air. In this study, wool fiber and fabric were corona discharged, and afterwards wettability, laundry shrinkage, and frictional coef ficients were determined. An ESCA analysis was done to elucidate…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of rigid dendritic macromolecules: enlarging the repeat unit size as a function of generation, permitting growth to continueJeffrey S. Moore and Zhifu XuCite this: Macromolecules 1991, 24, 21, 5893–5894Publication Date (Print):October 1, 1991Publication History Pub…