Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and characterization of poly(.beta.-hydroxyalkanoates) obtained from Pseudomonas oleovorans grown with mixtures of 5-phenylvaleric acid and n-alkanoic acidsY. B. Kim, R. W. Lenz, and R. C. FullerCite this: Macromolecules 1991, 24, 19, 5256–5260Publication Date (P…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLewis acidic catalysts for olefin epoxidation by iodosylbenzeneYihui Yang, Francois Diederich, and Joan Selverstone ValentineCite this: J. Am. Chem. Soc. 1991, 113, 19, 7195–7205Publication Date (Print):September 1, 1991Publication History Published online1 May 2002Published…
We have measured the specific heat (${\mathit{C}}_{\mathit{p}}$) of cyclohexane at 120T300 K when cyclohexane was physically restricted in porous Spherosil (silica) samples of pore radii 4, 7.5, 15, 30, and 62.5 nm. The behaviors of the monoclinic-to-cubic structural transition and of the melting transition of cyclohe…
Reasonable and significant structural differences between potassium silicate glass and sodium silicate glass can be revealed by molecular dynamics computer simulations.The differences in their immiscibility behavior reflect these structural differences. The simulation results are consistent with the experimental obser…
The role of protein residues in activating the substrate in the reaction catalyzed by the flavoprotein p-hydroxybenzoate hydroxylase was studied. X-ray crystallography (Schreuder, H. A., Prick, P.A.J., Wieringa, R.K., Vriend, G., Wilson, K.S., Hol, W.G. J., and Drenth, J. (1989) J. Mol. Biol. 208, 679-696) indicates t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSimulations of buckminsterfullerene (C60) collisions with a hydrogen-terminated diamond {111} surfaceR. C. Mowrey, D. W. Brenner, B. I. Dunlap, J. W. Mintmire, and C. T. WhiteCite this: J. Phys. Chem. 1991, 95, 19, 7138–7142Publication Date (Print):September 1, 1991Publicati…
A dilute dispersion containing drops of one fluid dispersed in a second, immiscible fluid is considered. The drops are sufficiently small that inertia is negligible and that they remain spherical. Two drops of different size are in relative motion due to either Brownian diffusion or gravitational sedimentation. When t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT"Inverse" organic-inorganic composite materials. 2. Free-radical routes into nonshrinking sol-gel compositesBruce M. Novak and Caroline DaviesCite this: Macromolecules 1991, 24, 19, 5481–5483Publication Date (Print):September 1, 1991Publication History Published online1 May…
The effect of impurity coimplantation in MeV erbium-implanted silicon is studied. A significant increase in the intensity of the 1.54-μm Er3+ emission was observed for different coimplants. This study shows that the Er3+ emission is observed if erbium can form an impurity complex in silicon. The influence of these imp…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCobalt phthalocyanine crystal synthesized at low temperatureToshio Enokida and Ryo HirohashiCite this: Chem. Mater. 1991, 3, 5, 918–921Publication Date (Print):September 1, 1991Publication History Published online1 May 2002Published inissue 1 September 1991https://pubs.acs.o…
The x-T phase diagram of K1−x (NH4)xH2PO4 mixed crystals have been plotted on the base of results of dielectric measurements and literature data.
The effects of oxygen on film structures and film stresses of sputtered Mo thin films have been investigated. Mo films (8000 Å) were deposited on Si(111) wafers in 0.4 Pa using Ar or Ar+O 2 (O 2 partial pressure: 0.01 Pa) working gases at 423 K. The major impurity was oxygen, and argon content was below the detection…
The optical properties of trivalent chromium ions in zirconium-barium-lanthanum fluoride glasses [${62\mathrm{Z}\mathrm{r}\mathrm{F}}_{4}$-${30\mathrm{B}\mathrm{a}\mathrm{F}}_{2}$-${8\mathrm{L}\mathrm{a}\mathrm{F}}_{3}$, ${57\mathrm{Z}\mathrm{r}\mathrm{F}}_{4}$-${34\mathrm{B}\mathrm{a}\mathrm{F}}_{2}$-${5\mathrm{L}\ma…
Oxygen tracer diffusion coefficients are determined in single‐crystal alumina samples; with differing dopant levels using the gas‐exchange technique. The diffusion direction is parallel to the c ‐axis and the ambient P o 2 is 1 atm (10 5 Pa) for all experiments except a single run with a low P o 2 The diffusion is ins…
A kinetic study of the precipitation reaction from supersaturated zincate solutions is made by conductometric and nephelometric measurements and by complexometric titration of the zinc remaining in the solution. The precipitation occurs following a homogeneous and a heterogeneous reaction, the second one being catalyz…
Relations between the glass transition, the flow, and the liquidus temperatures were studied in order to determine compositions of silica‐rich oxide materials for planarization layers in very large scale integrated technology. Thus, the Si 1 / 2 O , B 2 / 3 O , P 2 / 5 O , Ge 1 / 2 O , and AS 2 / 3 O binary phase diag…
The 4f electrons of lanthanides yield three types of transitions: (i) Internal 4f-4f transitions which give rise to sharp, narrow bands of comparatively weak intensities which are Laporte forbidden. (ii) Allowed 4fn−4fn-1 (n – l)d, which are relatively broad and intense. (iii) Broad and often intense 4fn−λ−1 fn+1 elec…
The flux density B for a magnetic field H in a soft magnetic material is given by the derivatives of the stored coenergy density with respect to the components of H. Any single-valued nonlinear tensor permeability may therefore be stored compactly, and retrieved with little computation, by storing its coenergy density…
An empirical tight-binding framework and the recursion method are used to calculate some electronic properties of II-VI semiconductor nanocrystals. First, the ground-state energy of the exciton is calculated. Results are given for six different II-VI compounds. A simple evaluation of the optical absorption peak of the…
A simple monitoring technique has been used to derive information on Hoc growth and break-up in agitated clay suspensions of quite high solids content (1 and 3% w/v), under the influence of a high molecular weight cationic polymer. For fairly low polymer dosages and high mixing speeds floe growth in the 3% suspensions…