Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhysical gels of aqueous poly(vinyl alcohol) solutions: a small-angle neutron-scattering studyWen Li Wu, Mitsuhiro Shibayama, Saroj Roy, Hidenobu Kurokawa, Laurence D. Coyne, Shunji Nomura, and Richard S. SteinCite this: Macromolecules 1990, 23, 8, 2245–2251Publication Date…
Abstract The chemical microstructural analysis (CMA) developed by Rowland and his school was applied to Valonia and bacterial cellulose and the results compared to those obtained with cellulose from cotton linters. It was found that the surface reactivity of Valonia was very small, roughly one half of that found for b…
Among the available methods in theoretical shell morphology. moving‐frame method, produce the broadest range of shell shapes and appear to emulate most closely the biological processes involved in shell morphogenesis and growth. In addition, moving‐frame methods can easily be enhnneed in both respects by adding operat…
Abstract In this article we describe an x‐ray photoelectron spectrometer that can either be used as an ultra‐high vacuum instrument ( p < 10 −10 mbar) or, after insertion of a movable aperture, to analyse materials at ambient pressures up to 1 mbar. We will describe the basic design of the instrument, and the metho…
Five acetic acid-sensitive mutants of Acetobacter aceti subsp. aceti no. 1023 were isolated by mutagenesis with N-methyl-N'-nitro-N-nitrosoguanidine. Three recombinant plasmids that complemented the mutations were isolated from a gene bank of the chromosome DNA of the parental strain constructed in Escherichia coli by…
An instrument capable of detecting and locating partial discharge sites and faults in shielded power cables was developed on behalf of a group of US electric utilities. The instrument uses state-of-the-art electronic hardware and advanced digital signal processing techniques. The partial discharge signals are reconstr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural and magnetic studies on macrocyclic dicopper(II) complexes. Influence of electron-withdrawing axial ligands on spin exchangeSanat K. Mandal, Laurence K. Thompson, Michael J. Newlands, Eric J. Gabe, and Kamalaksha NagCite this: Inorg. Chem. 1990, 29, 7, 1324–1327Pu…
This paper presents some of the major results which have contributed to the present understanding of the behaviour of the α-β transition of quartz, one century after its discovery by Le Chatelier in 1889. Most properties of the low temperature α phase can be explained in the frame of the Landau theory of first-order t…
Infrared spectroscopic studies of lead and alkaline‐earth aluminosilicate glasses in the series x MO‐ x Al 2 O 3 (1 ‐ 2 x )SiO 2 M = Mg, Ca, Sr, Ba, and Pb; 0.05 x 0.275] were carried out in the range 2000 to 200 cm −1 . Three major absorption bands were observed in the 1100‐, 800‐, and 500‐cm −1 regions. The frequenc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhthalocyaninato polysiloxanes substituted with crown ether moietiesO. E. Sielcken, L. A. Van de Kuil, W. Drenth, J. Schoonman, and R. J. M. NolteCite this: J. Am. Chem. Soc. 1990, 112, 8, 3086–3093Publication Date (Print):April 1, 1990Publication History Published online1 M…
Future space power needs are extrapolated to be at least three to four orders of magnitude more than is currently available. This long-term reliable power will be required on missions such as the Space Station, Pathfinder, Space Plane, and high-powered satellites, and for national defense. Electrical insulation and di…
Phase transitions in ferroelastic and other crystals with large elastic anomalies (i.e. co-elastic crystals) follow Landau-type behaviour over extended temperature intervals. No or only weak anomalies occur near the transition point and Landau-type behaviour occurs down to the saturation temperature below which the or…
The observation of a new critical point in liquid-crystal phase transitions is reported. Detailed tilt-angle, polarization, and susceptibility measurements of a ferroelectric liquid-crystal compound in the presence of an applied dc electric field show that a first-order phase transition between the polarized smectic-A…
Abstract A theory based on classical nucleation theory is developed for bubble nucleation in polymer solutions. The theory requires information on solubility, diffusivity, concentration, surface tension, temperature, and degree of supersaturation. The effects of supersaturation and of the presence of large molecules i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleSurface modification of PMDA-oxydianiline polyimide. Surface structure-adhesion relationshipKang Wook Lee, Steven P. Kowalczyk, and Jane M. ShawCite this: Macromolecules 1990, 23, 7, 2097–2100Publication Date (Print):April 1, 1990Publication History Published online1 May 2002Pub…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAcid salts and the structure of ionomersMichael M. Coleman, Joon Y. Lee, and Paul C. PainterCite this: Macromolecules 1990, 23, 8, 2339–2345Publication Date (Print):April 1, 1990Publication History Published online1 May 2002Published inissue 1 April 1990https://pubs.acs.org/…
The dynamic organization of dislocations into spatially heterogeneous substructures is demonstrated by applying the principles of dislocation dynamics that were outlined in the preceding paper. Here it is shown that the formation of persistent slip bands is a consequence of the competition between dipole formation and…
We generalize the Chen-Lubensky model for the point where the nematic, smectic-A, and smectic-C liquid-crystalline phases meet (the NAC point) to include the effects of molecular chirality. We calculate the phase diagram for this model when the possibility of a twist-grain-boundary (TGB) phase is included and when it…
Abstract The reduction and reoxidation of three nontronite samples, GAN (API H-33a, Garfield, Washington), SWa-1 (ferruginous Washington smectite), and NG-1 (Hohen Hagen, Federal Republic of Germany) were studied with visible absorption and Mössbauer spectroscopy. The intensity of the intervalence electron transfer (I…
Microcomposite membranes were produced via the in situ diffusion-controlled, acidcatalyzed sol-gel reaction for tetraethoxysilane in prehydrated and methanol-swollen Nafion perfluorosulfonic acid films. The thermal behavior of these microcomposites was investigated using thermogravimetric analysis (TGA) and differenti…