Materials Literature
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The novel organic ion-complex crystal composed of protonated merocyanine and p-toluenesulfonate anion, i.e., 1-methyl-4-(2-(4-hydroxyphenyl)vinyl)pyridinium 4-toluenesulfonate (MC-PTS), was synthesized for second-order nonlinear optics. Crystal structure analysis revealed that MC-PTS crystallized in the space group of…
The biocompatibility of a subcutaneously implanted bovine collagen sponge (Haemostagen) was studied in rats by analyzing tissue reactions up to 3 months by histological and ultrastructural methods; in addition, the level of serum antibodies to bovine type I collagen (the major implant collagen) was measured by solid-p…
Abstract A new type of twin liquid crystalline complex having two terminal mesogenic units and a central flexible spacer has been formed through intermolecular hydrogen bonds between a nonmesogenic aliphatic diacid and mesogenic stilbazoles.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemical effects of continuous and pulsed ultrasound: a comparative study of polymer degradation and iodide oxidationArnim. Henglein and Maritza. GutierrezCite this: J. Phys. Chem. 1990, 94, 12, 5169–5172Publication Date (Print):June 1, 1990Publication History Published onli…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStereochemistry of the ring-opening polymerization of (S)-.beta.-butyrolactoneYan Zhang, Richard A. Gross, and Robert W. LenzCite this: Macromolecules 1990, 23, 13, 3206–3212Publication Date (Print):June 1, 1990Publication History Published online1 May 2002Published inissue…
Radiocopper-labeled pyruvaldehyde bis(N4-methylthiosemicarbazonato)copper(II), Cu[PTSM], is under investigation as a radiopharmaceutical for evaluation of regional blood flow in the brain, heart, and kidneys because it affords relatively high levels of radioactivity in these organs upon intravenous injection, followed…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolydispersity effects on the microphase-separation transition in block copolymersC. Burger, W. Ruland, and A. N. SemenovCite this: Macromolecules 1990, 23, 13, 3339–3346Publication Date (Print):June 1, 1990Publication History Published online1 May 2002Published inissue 1 Ju…
In 1974, Halperin, Lubensky, and Ma (HLM) [Phys. Rev. Lett. 32, 292 (1974)] predicted that the nematic--smectic-A transition of pure compounds and their mixtures should be at least weakly first order. One way to obtain such a prediction is to treat the smectic order parameter as a constant and integrate out the direct…
The coupling of the Stefan equation for the heat flow with the Gibbs–Thomson law relating the melting temperature to the mean curvature of the phase interface is considered. Solutions, global in time, are constructed which satisfy the natural a priori estimates. Mathematically the main difficulty is to prove a certain…
Third‐order optical nonlinear susceptibilities (χ (3) ) of some high‐refractive‐index chalcogenide glasses were evaluated from third‐harmonic generation. Compared with oxide glasses whose χ (3) has been known, χ (3) of the present glasses was higher by an order of magnitude. The addition of selenium drastically increa…
The mechanism of partial discharge (PD) occurring in the CIGRE Method II (CM-II) electrode system, which is a representative closed-void model system is discussed in the context of a computer-aided PD measuring system. Measurements of PD are made for the CM-II electrode system. Effects of the pressure and gas inside t…
Abstract New aromatic polyamides (aramids) having inherent viscosities of 0.5–2.6 dL/g were prepared by the direct polycondensation of 4,4′‐diaminotriphenylamine with various aromatic dicarboxylic acids in N ‐methyl‐2‐pyrrolidone using triphenyl phosphite and pyridine as condensing agents. These aramids were amorphous…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFormation and expansion of dark spots in stratifying foam filmsP. Kralchevski, A. Nikolov, D. T. Wasan, and I. IvanovCite this: Langmuir 1990, 6, 6, 1180–1189Publication Date (Print):June 1, 1990Publication History Published online1 May 2002Published inissue 1 June 1990https…
Growth of collagen fibrils was examined in a system in which collagen monomers are generated by specific enzymic cleavage of type IpCcollagen with procollagen C-proteinase. Fibrils formed at 37 degrees C had highly tapered and symmetrical pointed tips. The pattern of cross-striations in the pointed tips indicated that…
Field effect transistors, schottky diodes, and solar cells are among the applications of organic semiconductors now being developed. Questions concerning charge generation and transport as well as doping mechanisms in these materials, which include polyacetylenes, polythiophenes and metallophthalocyanines are reviewed…
An acoustic backscattering technique for detecting transient cavitation produced by 10-microseconds-long pulses of 757-kHz ultrasound is described. The system employs 10-microseconds-long, 30-MHz center frequency tone bursts that scatter from cavitation microbubbles. Experiments were performed with suspensions of hydr…
Abstract In the study of microstructural evolution and macroscopic property changes due to radiation damage, the point defects are usually modelled as being produced continuously in time and uniformly in space. Furthermore, the excess of vacancies required to sustain the void growth is assumed to arise entirely due to…
The interaction between synthetic polymers and the natural environment in terms of the effects of oxygen, radiant energy, and living organisms has been extensively studied over the past two decades [1]. However, the recent trends in the preservation of the environment have created much public interest. This is due to…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTransformation of Valonia cellulose crystals by an alkaline hydrothermal treatmentJunji Sugiyama, Takeshi Okano, Hiroyuki Yamamoto, and Fumitaka HoriiCite this: Macromolecules 1990, 23, 12, 3196–3198Publication Date (Print):June 1, 1990Publication History Published online1 M…
We have studied by $^{29}\mathrm{Si}$ NMR the complete condensation kinetics in the conditions of rapid hydrolysis (acidic medium, water in excess) of three silicon alkoxides. The gelation of the tetravalent tetraethoxysilane (TEOS) takes several weeks, whereas the trivalent methyltriethoxysilane (MTEOS) and vinyltrie…