Materials Literature
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We show that, due to the coupling between tilt (amplitude of the antisymmetric part of the font profile) and phase dynamics, the phenomenology of tilt domains of finite width proposed by Coullet et al. within the assumption of a subcritical homogeneous tilt bifurcation retains the same qualitative features when this b…
The analytic predictions from the Self-Consistent Field(SCF) theory for grafted polymer layers are compared in detail with the recent Monte Carlo simulations using the bond-fluctuation model. Quantities describing the equilibrium structure of the brush are derived from the SCF theory and compared with the Monte Carlo…
The extracellular elastase (33 kDa) of Pseudomonas aeruginosa is synthesized as a 53.6 kDa preproenzyme containing a long, N-terminal propeptide. The free propeptide and the elastase precursor generated upon propeptide removal were isolated from P. aeruginosa cells and subjected to N-terminal amino acid sequence analy…
ADVERTISEMENT RETURN TO ISSUEPREVArticleStructure and chemistry of silicon nitride and silicon carbonitride thin films deposited from ethylsilazane in ammonia or hydrogenY. W. Bae, H. Du, B. Gallois, K. E. Gonsalves, and B. J. WilkensCite this: Chem. Mater. 1992, 4, 2, 478–483Publication Date (Print):March 1, 1992Publ…
In this paper we provide a detailed description of the interaction of solutal convection and morphological instability in the presence of a model boundary-layer flow. We present a detailed investigation of the structure of the marginal surfaces in Rayleigh-number, Sekerka-number, Reynolds-number space associated with…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUnusual phase behavior of some poly(dialkoxyphosphazenes)V. S. Papkov, M. N. Il'ina, V. P. Zhukov, D. Ya. Tsvankin, and D. R. TurCite this: Macromolecules 1992, 25, 7, 2033–2040Publication Date (Print):March 1, 1992Publication History Published online1 May 2002Published inis…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRegulation of alignment of cyanobiphenyl liquid crystals by azobenzene molecular filmsKoso Aoki, Takashi Tamaki, Takahiro Seki, Yuji Kawanishi, and Kunihiro IchimuraCite this: Langmuir 1992, 8, 3, 1014–1017Publication Date (Print):March 1, 1992Publication History Published o…
Non‐oxide ceramics , for example aluminum nitride, silicon carbide, and silicon nitride, are ideal materials for applications under high thermal and mechanical stress. The synthetic methods including liquid‐phase sintering processes, the microstructures of the resulting materials (figure shows Si 3 N 4 from powder pro…
Abstract Poly(etherurethane) (PEU) and poly(etherurethaneurea) (Biomer®) films with and without antioxidant stabilizers were subcutaneously implanted into dogs and rats for up to 10 weeks. It was found that the molecular weight of the PEU films decreased over the 10‐week period, while the Biomer® films increased in mo…
Fasciclin I is a homophilic cell adhesion molecule in insects that is dynamically expressed on a subset of axon pathways in the embryonic nervous system, and on a variety of other cells and tissues during development. The fasciclin I protein consists of four homologous 150 amino acid domains. In this article, we descr…
The preparation and solid state characterization of the bifunctional radical furan-2,5-bis(1,2,3,5-dithiadiazolyl) 2,5-[(S 2 N 2 C)OC 4 H 2 (CN 2 S 2 )] and the related monofunctional radical 2-cyanofuran-5-(1,2,3,5-dithiadiazolyl) 2,5-[(S 2 N 2 C)OC 4 H 2 (CN)] are described. The crystal structure of 2,5-[(S 2 N 2 C)…
Abstract A novel process for the preparation of highly saturated nitrile rubber latex has been developed. This process directly converts NBR latex into HNBR latex in one reaction step. The key to the process is the efficient in-situ generation of diimide within the latex by the oxidation of hydrazine hydrate in the pr…
For pt.X see ibid., vol.8, no.1, p.16 (1992). The correlation of partial discharge (PD) measurements with insulation degradation and failure is addressed. The limitations inherent to such diagnostics as applied to solid insulating systems are examined. The discussion is based on simple experimental facts and the physi…
A Fortran 77 Monte Carlo source code built from the EGS4 Monte Carlo code system has been used for timing benchmark purposes on 29 different computers. This code simulates the deposition of energy from an incident electron beam in a 3-D rectilinear geometry such as one would employ to model electron and photon transpo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOptical characterization of ordering and disordering of block copolymer microstructureKarl Amundson, Eugene Helfand, Sanjay S. Patel, Xina Quan, and Steven D. SmithCite this: Macromolecules 1992, 25, 7, 1935–1940Publication Date (Print):March 1, 1992Publication History Publi…
In polycrystalline materials, the microscopic strain field is always highly heterogeneous during inelastic deformation, even when the macroscopic strain field is uniform. This is particularly true near potential damage and failure nucleation sites, such as voids and inclusions. Also, in the context of high-strain-rate…
High-resolution, fast optical hole-burning results are reported for the amorphous system cresyl violet in ethanol glass at 1.3 K. Holes are burned and detected using a novel technique which allows precise detection of narrow (∼0.03 cm−1 ), shallow (∼1%) holes 10 μs to 50 ms after their generation. The technique is des…
The charge distribution in negatively corona-charged Teflon FEP (fluoroethylenepropylene) films was investigated with the laser-induced pressure-pulse method. The 12.7- and 25.4-μm samples were charged to potentials up to −2500 and −4500 V, respectively, and thereafter stored at room temperature. Measurements of the c…
Abstract High-resolution electron microscopy and microanalytical studies were performed on clay and bulk soil samples developed on various igneous and metamorphic rocks from Galicia in the Coruna province in NW Spain. Two mineralogical microsystems can be distinguished showing different stages of weathering. For felds…
The electronic properties of passive films on Fe-Cr alloys were determined by the photoelectrochemical technique. Measurement of the flat band potential for the passive films on the different alloys indicated that the film is doped increasingly n-type as the Cr concentration in the base alloy is increased. This doping…