Materials Literature
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Abstract A combination of electrochemical and microgravimetric techniques, utilizing the electrochemical quartz crystal microbalance (EQCM), has been employed to study the ion transport behavior of polypyrrole films, prepared with a variety of electrolytes, during redox switching. Systems investigated include poly(pyr…
The statistical nature of chemical polymerization processes ensures that the materials prepared by such methods will consist of mixtures of chains. In contrast, ribosomal catalysis of protein synthesis on messenger RNA templates affords homogeneous products in which chain length, sequence, and stereochemistry are subj…
Current density-voltage characteristics have been obtained from evaporated cobalt phthalocyanine thin Film sandwich structures using ohmic gold contacts, both before and after annealing. Results show that at low voltages the conduction process is ohmic, while at high voltages space-charge limited conduction is present…
Brillouin scattering in aqueous LiCl solutions was investigated in the concentration range 5--36 mol % at temperatures between 375 and 78 K. The polarized spectra were found to be accurately described by generalized hydrodynamics with a single-relaxation-time structural-relaxation process. The relaxation times obey th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRegioselectivities and stereoselectivities of singlet oxygen generated by cyclodextrin-sandwiched porphyrin sensitization. Lipoxygenase-like activityYasuhisa Kuroda, Takashi Sera, and Hisanobu OgoshiCite this: J. Am. Chem. Soc. 1991, 113, 7, 2793–2794Publication Date (Print)…
Abstract Non-symmetric diarylethenes with an indole ring on one end and a thiophene, a benzo[b]thiophene, or a pyrrole ring on the other end of the double bond were synthesized in an attempt to get thermally irreversible photochromic compounds having absorption bands at longer wavelengths. 2-(1,2-Dimethyl-3-indolyl)-3…
We consider a pseudoparabolic regularization of a forward-backward nonlinear diffusion equation ${u_t} = \Delta (f(u) + \nu {u_t})$, motivated by the problem of phase separation in a viscous binary mixture. The function $f$ is non-monotone, so there are discontinuous steady state solutions corresponding to arbitrary a…
High intensity ultrasound causes the formation of cavitation bubbles which collapse in a manner that, in the presence of a solid surface, form high velocity fluid microjets directed toward the surface. The intense fluid agitation at surfaces in a focused ultrasound field enhances transport of momentum, heat, and mass…
We develop a model for the phase transitions of a system of infinitely long, semiflexible chains that interact through a steric, excluded-volume repulsion. This model combines density-functional theory for freezing with the Onsager theory of orientational ordering. We derive phase diagrams in terms of pressure or dens…
We recently cloned and sequenced alpha 1 (VIII) collagen cDNAs and demonstrated that type VIII collagen is a short-chain collagen that contains both triple helical and carboxyl-terminal non-triple helical domains similar to those of type X collagen (Yamaguchi, N., Benya, P., van der Rest, M., and Ninomiya, Y. (1989) J…
The influence of exchangeable cations on montmorillonite, illite, and kaolinite and of lattice charge of montmorillonite on clay-humic acid complexation were studied with complexes which were subjected to drying. The amounts of humic acid (HA) nonextractable by water from the complexes (termed “fixed” humic acid) were…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal and molecular structure of hexakis(tert-butoxo)dialuminum. Comments on the extent of M-O .pi. bonding in Group 6 and Group 13 alkoxidesRoger H. Cayton, Malcolm H. Chisholm, Ernest R. Davidson, Vincent F. DiStasi, Ping Du, and John C. HuffmanCite this: Inorg. Chem. 19…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUse of hydrogen bonds to control molecular aggregation. Association of dipyridones joined by flexible spacersMichel Gallant, Phan Viet Minh Tan, and James D. WuestCite this: J. Org. Chem. 1991, 56, 7, 2284–2286Publication Date (Print):March 1, 1991Publication History Publish…
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The local structure around Bi atoms has been studied in ${\mathrm{Ba}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{K}}_{\mathit{x}}$${\mathrm{BiO}}_{3}$ (0.0x0.4) via x-ray-absorption spectroscopy. The structure is determined in terms of coordination numbers and interatomic distances around the Bi atoms between 300…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPyrolysis chemistry of an organometallic precursor to silicon carbideWayde R. Schmidt, Leonard V. Interrante, Robert H. Doremus, Todd K. Trout, Paul S. Marchetti, and Gary E. MacielCite this: Chem. Mater. 1991, 3, 2, 257–267Publication Date (Print):March 1, 1991Publication H…
Preceramic polymers offer exceptional potential for low‐temperature processing of both oxide and non‐oxide ceramics. In addition, shapes such as fibers, films, and membranes that are not commonly available using standard processing techniques are readity available using preceramic polymers. In non‐oxide ceramics, the…
Abstract The microstructure development during capillary flow of polyblends containing Liquid Crystalline Polymers (LCPs) was studied. In the present investigation the wholly aromatic LCP constituent was the minor phase suspended in polycarbonate (PC), poly(butyleneterephthalate) (PBT) or Nylon 6 (N‐6), in addition to…
The primary sequence of the receptor for L-arabinose or Ara-binding protein (ABP) composed of 306 residues is very different from the D-glucose/D-galactose-binding protein (GGBP) which consists of 309 residues. Nevertheless, superimpositioning of the well-refined high resolution structures of ABP in complex with D-gal…
Crystal/material quality and electrical properties of B-doped diamond films synthesized by microwave plasma chemical vapor deposition were investigated. Raman spectroscopy verified the presence of diamond and indicated that the crystal quality increased with B doping. Secondary-ion mass spectroscopy showed that the B/…