Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBrush Formation by Symmetric and by Highly Asymmetric Diblock Copolymers at Homopolymer InterfacesAndrzej Budkowski, Jacob Klein, and Lewis J. FettersCite this: Macromolecules 1995, 28, 25, 8571–8578Publication Date (Print):December 1, 1995Publication History Published onlin…
Abstract Dehydration and rehydration of a phlogopitic Ca-vermiculite were studied by thermoanalysis (TG, DSC) and by in situ X-ray powder diffractometry. A detailed analysis of the relationship between temperature and state of hydration of the vermiculite close to equilibrium at atmospheric pressure was rendered possi…
We investigate the structure and chemical composition of silk proteins produced by silkworms reared entirely on an artificial (A) diet, and compared those with worms entirely on a mulberry leaf ( M ) diet. The artificial diet has tofu-cake as its main component. Two types of cocoons (A and M) are used as sample materi…
In applying catalysis to real combustor applications the modeling of transport and chemistry interactions can be key to understanding combustion characteristics. For example the effect of boundary-layer flow and heterogeneous /homogeneous chemistry can determine product selectivity for catalytically promoted oxidation…
The synthesis of a novel phthalocyanine mesogen, containing four flexible side chains terminated with a bulky trityl moiety, is described. This compound forms a well defined anisotropic glass, indefinitely stable at room temperature, in which the hexagonal ordered structure of its columnar mesophase is preserved. Such…
peer reviewed
A novel oleic acid ester of the carotane sesquiterpene 14-hydroxy CAF-603 was isolated from Trichoderma virens grown in a solid brown rice-based medium, a solid millet-based medium, or a mannitol-based liquid medium. Its structure was determined on the basis of ms and nmr analysis. It retains distinct biological activ…
A brief description of the basic optical and electro-optical effects observed in polymer-dispersed liquid crystals (PDLCs) is presented. Theoretical models of light scattering from such structures and measurement techniques of PDLC optical properties are included, based on which of the material properties of polymer a…
Positional information along the dorsal-ventral axis of the Drosophila embryo is acquired through a signal transduction pathway which employs a extracellular protease cascade. The sequential activation of serine protease zymogens results in the ventrally localized production of a ligand in the perivitelline space of t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFormation of Highly Stable Heterodimers in Aqueous Solution Between .beta.-Cyclodextrin Derivatives Bearing Multiple Opposite ChargesBertrand Hamelin, Ludovic Jullien, Frederique Guillo, Jean-Marie Lehn, Alain Jardy, Laurence De Robertis, and Hugues DriguezCite this: J. Phys…
A random-walk approach is developed for tracer diffusion by a point-defect mechanism in grain boundaries with a periodic structure. Such boundaries are characterized by a finite spectrum of possible atomic jumps. The effective (macroscopically measured) diffusion coefficient is expressed in terms of the different jump…
We measured the third-harmonic spectrum for each of four squaraine dyes in chloroform. By fitting the experimental dispersion of the third-order susceptibility, γ, to a four-level sum-over-states model, we determine the strength and the location of the lowest-lying two-photon-like transition. In each case, we find tha…
We present here the experimental and theoretical analysis of the x-ray near-edge absorption spectra of LaNi${\mathrm{O}}_{3}$, NdNi${\mathrm{O}}_{3}$, ${\mathrm{Nd}}_{1\ensuremath{-}x}{\mathrm{La}}_{x}\mathrm{Ni}{\mathrm{O}}_{3}$, and $\mathrm{Nd}{\mathrm{Ni}}_{1\ensuremath{-}x}{\mathrm{Fe}}_{x}{\mathrm{O}}_{3}$ solid…
Aluminum K‐edge XANES spectra of high pressure and high temperature (4.4 GPa and 1575°C) glasses along the NaAlSi 2 O 6 (Jd)‐NaAlSi 3 O 8 (Ab) join are reported using synchrotron radiation, and shown to provide direct experimental evidence for the pressure‐induced coordination change of Al. Five‐ and six‐fold coordina…
To obtain an optimum shape memory component, functional and structural properties have to be connected during fabrication. To fulfil these requirements thermomechanical treatments are used to generate favourable microstructures by "combined reactions". Combined reactions can be composed of recrystallization, precipita…
The microstructure and nonohmic characteristics of polycrystalline ZnO-V 2 O 5 ceramics with V 2 O 5 as the only additive ranging from 0 to 2 mol% were investigated. An abnormal grain growth was observed for ZnO doped with V 2 O 5 and sintered at 900° C. However, the non-uniformity of the grain structure alleviated wi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural Study of Poly(phenylsilsesquioxane) Sol-Gel MaterialsM. Smaihi, T. Jermoumi, and J. MarignanCite this: Chem. Mater. 1995, 7, 12, 2293–2299Publication Date (Print):December 1, 1995Publication History Published online1 May 2002Published inissue 1 December 1995https:…
Abstract Samples from deep wells of the Palaeozoic Illinois Basin show the evolution of the illite-smectite (I-S) mineral transformation under low temperatures for very long periods of time. Curve decomposition of the XRD traces was used to identify and follow the evolution of the different clay minerals. All samples…
Five new chiral liquid crystal systems induced by intermolecular hydrogen bonding between 4-[(s)-2-chloro-3-methyl]butyroyloxy-4′-stilbazole (MBSB, proton acceptor) and 4-alkoxybenzoic acids (nBA, proton donors) were prepared. Their liquid crystalline properties were investigated by DSC and polarized optical microscop…
The effect of substrate rotation on transport of reactive gases and epitaxial growth rate is investigated for a horizontal single‐wafer reactor using a model and experiments. The governing equations for gas velocity, temperature, and chemical species transport are solved for the system for Si thin‐film preparation. Th…