Materials Literature
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A literature review on space-charge electrets, covering the time period 1987 to 1996, is presented. The review starts out with a discussion of new inorganic and organic electret materials which also includes silicon based single and double layers. This is followed by a review of recent work on methods for measuring ch…
The Monte Carlo simulation technique (the bond fluctuation model) has been used for the study of the equilibrium conformations of comb-branched polymers consisting of a long flexible main chain and side chains grafted at a regular separation onto the main chain. The solvent has been supposed to be good (athermal) for…
The structural and electronic properties of bulk cubic and tetragonal tungsten trioxide are investigated using a periodic boundary condition ab initio Hartree−Fock method; a posteriori density functional corrections are used to estimate the effect of electron correlation on the energy. The forces involved in the bondi…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTConformational Flexibility in Dodecasubstituted PorphyrinsDaniel J. Nurco, Craig J. Medforth, Timothy P. Forsyth, Marilyn M. Olmstead, and Kevin M. SmithView Author Information Department of Chemistry University of California Davis, California 95616-5295 Cite this: J.…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXT[Co(en)3]CoSb4S8: A Novel Non-Centrosymmetric Lamellar Heterometallic Sulfide with Large-Framework HolesHans-Oscar Stephan and Mercouri G. KanatzidisView Author Information Department of Chemistry and Center of Fundamental Materials Research, Michigan State University…
meso -Tetrakis( p -carboxyphenyl)porphyrin ( p TCPP), the atropoisomer (αααα) of meso -tetrakis( o -carboxyphenyl)porphyrin ( o TCPP), and the ammonium salt of the meso -tetrakis( p -sulfonatophenyl)porphyrin (noted p TSPP) were intercalated into [Zn−Al] layered double hydroxide (LDH) using different preparative metho…
Syntheses of diluted magnetic semiconductor Cd 1- y Mn y S nanoparticles varying in size from 1.9 to 3.5 nm and composition, y, from 0 to 0.3 have been performed in reverse micelles. Size and composition, y, of the particles are controlled independently. The particles are characterized by TEM, EDS, and EPR. Manganese…
For a spherical solid particle with a uniform surface at rest in a fluid/fluid interface, it is shown that if the line tension associated with the three-phase contact line around the particle is increased (conceptually), the contact angle between the particle and interface does not change continuously to 0 or 180°. Ra…
We studied the formation in a salt-free solution of complexes between potassium poly(vinyl alcohol) sulfate (KPVS), a strong polyelectrolyte, and proteins with known amino-acid sequences: papain, human serum albumin, lysozyme, ribonuclease, trypsin, and pepsin. Turbidimetric titration, together with quasi-elastic ligh…
The crystallization kinetics and morphology in miscible blends of poly(vinylidene fluoride) (PVF 2 ) and poly(1,4-butylene adipate) (PBA) have been investigated using optical microscopy and differential scanning calorimetry. Blends of PVF 2 and PBA are unique in the sense that both components are capable of crystalliz…
CuZSM-5 is the most active catalyst known for the direct decomposition of NO x . We have performed first-principles quantum mechanical calculations to evaluate the electronic and structural properties of species adsorbed to Cu sites that might be involved in NO x decomposition. Using statistical mechanics, we have cal…
Spirooxazine photochromic dyes were trapped in gel thin films. Organically modified doped gels showed normal photochromism. The kinetics of the photochromism in these gels was quantified using both Gaussian and simple biexponential models in order to take into account the inhomogeneous distribution of free volume in t…
We measure the macroscopic capillary rise height of water on a chemically heterogeneous solid surface in the presence of vibrational noise. The amount of relaxation of the macroscopic contact angle depends on the mechanical characteristics as well as the energy of the vibrations. The macroscopic recede and advance con…
Studies were undertaken to gain mechanistic information on lactone ring-opening polymerization reactions using porcine pancreatic lipase (PPL) as the catalyst and ε-caprolactone (ε-CL) as the monomer. Polymerizations were carried out at low water levels (0.13 mmol) and supplemented with either butanol or butylamine. R…
A look inside the silk spinning process along the length of a silk gland has been achieved by the cryogenic quenching and subsequent microtoming of live silk-spinning animals, Nephila clavipes (spider) and Bombyx mori (silkworm). Observations made using transmission electron microscopy, electron diffraction and atomic…
ZnO films were prepared on silica glass substrates by the sol-gel method from Zn(CH3COO)2⋅2H2O-2-methoxyethanol solutions containing monoethanolamine (MEA) or diethanolamine (DEA). Smooth and transparent ZnO films were obtained by heating at temperatures from 200 to 500°C for 10min after each coating and finally at th…
Phase separation in a polymerizing diacrylate/LC mixture is shown to be driven by liquid−gel demixing rather than by liquid−liquid demixing. The structure of the gel strongly influences the initial morphology: “early” phase separation (at low conversion) produces spherical domains, whereas “late” phase separation (at…
We studied the viscoelasticity of two lyotropic lamellar systems prepared in the so-called “onion phase”. This state consists of monodisperse multilamellar vesicles filling up space. The elastic ( G ‘) modulus is measured as a function of the frequency in the linear regime (small amplitude of the oscillations) for dif…
A description is given of a modeling technique that is used to explore three-dimensional image distributions formed by high numerical aperture (NA > 0.6) lenses in homogeneous, isotropic, linear, and source-free thin films. The approach is based on a plane-wave decomposition in the exit pupil. Factors that are due…
The synthesis and characterization of siloxane-containing perfluorocyclobutane (PFCB) aromatic polyethers, a new class of fluorosiloxane polymers possessing a well-defined linear structure of alternating disiloxanyl- p -phenylene ( cis / trans) -1,2-disubstituted perfluorocyclobutyl ether linkages with known fluoroole…