Materials Literature
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The enzymatic degradation of films of synthetic poly[(R,S)-β-hydroxybutyrate], PHB, of various tacticities was investigated by weight loss measurement. Extracellular PHB depolymerases of the bacterium Pseudomonas lemoignei and the fungus Aspergillus fumigatus M2A were used. In both enzyme systems the nearly atactic sa…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation of Propylene Carbonate Acrylate and Poly(propylene carbonate acrylate) Electrolyte Elastomer Gels. 13C NMR Evidence for Li+-Cyclic Carbonate InteractionJosh H. Golden, Benjamin G. M. Chew, David B. Zax, Francis J. DiSalvo, Jean M. J. Frechet, and Jean-Marie Taras…
Dielectric, ferroelectric and electric field-induced strain properties of (Pb1-xBax)(Zr1-yTiy)O3 ceramics with 0.15 ≤ x ≤ 0.45 and 0.16 ≤ y ≥ 0.70 were investigated. A wide range of compositions possessing relaxor phase characteristics was found to exist near the boundaries between the ferroelectric rhombohedral, tetr…
Polyaniline (PAn) thin films were prepared from aniline solutions in by scanning the potential cyclically between −0.2 and 0.8 V ( vs. SCE). Films of different thicknesses, and hence different intrinsic oxidation states, reacted differently with . While redox reactions leading to the deposition of silver metal occurre…
Theoretical models relative to Raman scattering in disordered solids are discussed and compared with the available experimental evidence. In particular, experimental data relative to the Boson peak integrated intensity and computer simulations on three-dimensional site percolators, allow us to infer that the relevant…
The second peak in the structure factor of ${\mathit{AX}}_{2}$-type glasses is found to behave in an anomalous fashion with respect to network-modifier content in a manner similar to that characteristic of the first sharp diffraction peak (FSDP). The structural origin of this newly identified second sharp diffraction…
Abstract Photochromic polyurethane films containing 5-substituted 1,3-dihydro-3,3-dimethyl-1-alkylspiro[2H-indole-2,3′-[3H]pyrido[3,2-f][1,4]benzoxazine] and 1,3-dihydro-1,3,3-trimethylspiro[2H-indole-2,3′-[3H]naphth[2,1-b][1,4]oxazine] were degraded under xenon light exposure. The loss of the photochromic response wa…
We have studied, through time-resolved degenerate-four-wave mixing, the nonlinear response below the band gap of glasses doped with CdTe and CdS1−xSex nanocrystals by using 30-ps pulses from a Nd:YAG laser in the intensity range 0.4 – 1.6 GW/cm2. We found that the third-order nonlinearity is overshadowed by a fifth-or…
We present measurements of the thermal-expansion coefficient \ensuremath{\alpha}(T) on ${\mathrm{Fe}}_{100\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Mn}}_{\mathit{x}}$ alloys with 15x60 at. % in the temperature range 4T1150 K. The results show that \ensuremath{\alpha}(T) is anomalously enhanced especially in the hig…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA Solid-State Diastereomer, AgLa3GeS7Shiou-Jyh Hwu, Cordelia K. Bucher, James D. Carpenter, and Stephen P. TaylorCite this: Inorg. Chem. 1995, 34, 8, 1979–1980Publication Date (Print):April 1, 1995Publication History Published online1 May 2002Published inissue 1 April 1995ht…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural Variations in Layered Alkali Metal NaphthalenesulfonatesBrian J. Gunderman and Philip J. SquattritoCite this: Inorg. Chem. 1995, 34, 9, 2399–2406Publication Date (Print):April 1, 1995Publication History Published online1 May 2002Published inissue 1 April 1995https…
The γ-phase of the MC2 Ni-based superalloy has been characterized using both in situ experiments and post-mortem observations (bright field and weak beam) in transmission electron microscopes. A mean value of the stacking-fault energy (about 31 mJ m−2) has been obtained through the measurement of dissociated nodes and…
In situ Raman-spectroscopy studies were carried out on Ar-ion-laser-heated cubic boron nitride (cBN). Phase identification and temperature measurements were performed on micron-size particles and a pressure-compacted free-standing thin film of cBN. In both cases, cBN was shown to transform to the rhombohedral phase (r…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpin-Coated V2O5 Xerogel Thin Films. 1. Microstructure and MorphologyStefano Passerini, David Chang, Xi Chu, Dinh Ba Le, and William SmyrlCite this: Chem. Mater. 1995, 7, 4, 780–785Publication Date (Print):April 1, 1995Publication History Published online1 May 2002Published…
The conductivity spectra of three supercooled glass-forming molten salts, LiCl·7H2O, Ca(NO3)2·4H2O and 3KNO3·2Ca(NO3)2, have been taken at various temperatures above T G. The data cover a wide frequency range from a few MHz to the far infrared. The d.c. conductivities exhibit Vogel-Fulcher-Tammann temperature dependen…
To use the structure-forming potential and the biodegradability of cellulose and nonionic cellulose ethers, we developed synthesis pathways for soluble and regenerable silyl celluloses suitable for the design of advanced materials. A 6-0-silylation of cellulose takes place in a heterogeneous phase reaction in the pres…
Nanoporous sensor materials based on tin chalcogenides are shown to respond to be absorption of guest molecules by a measurable deformation of their open‐framework structures which results in changes in heir optical absorption properties. The magnitude and type of deformation depends on the identity of the guest speci…
We have studied heat and mass transfer in wool, cotton, nylon, and polyester fabric beds during steaming. Our mathematical model, which is based on local volume average methods, considers the finite rates of heat and mass transfer between the solid, gaseous, and liquid phases of the system. Experiments involve the ste…
On the basis of known equations for calculating X-ray diffraction intensities from a given number of unit cells of a crystal phase in polycrystalline material, as due to: (i) Bragg reflections; (ii) average diffuse scattering caused by thermal plus first-kind disorder; and (iii) incoherent scattering, a relationship h…
For carbohydrates the GROMOS force field has been extended to a more realistic all-atom model, with the use of parameters from the force field proposed by Ha, Giammona, Field & Brady [Carbohydr. Res. (1988), 180, 207-221]. This extended and modified GROMOS force field has been used to simulate the crystal structures o…