Materials Literature
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The human colon carcinoma cell line Caco-2 spontaneously undergoes enterocytic differentiation in culture. We used sodium butyrate to modify differentiation and growth properties of this cell line and considered c-myc expression as a potential target. Degradation of normal c-myc mRNAs with a half-life of 20 min is not…
Logarithmic dispersion relations are shown to be applicable to the determination of the phase of the structure factor of surface layers probed by neutron and x-ray reflectivity. For certain profiles it is shown that the phase \ensuremath{\Phi}(q) of the structure factor F(q) is determined entirely by the observed refl…
We report a detailed study of the optical phase shift induced by a polymer-dispersed liquid crystal subjected to a low-frequency electric field. A relationship between the optical phase shift and the droplet and sample order parameters ${\mathit{S}}_{\mathit{d}}$ and ${\mathit{S}}_{\mathit{f}}$ is worked out in order…
We report the first investigation of the adsorption of water on diamond (100) by infrared multiple-internal-reflection spectroscopy using a natural type IIa diamond internal reflection element. The first direct evidence of the diamond surface hydride structures, obtained by deuterium substitution, is also presented. I…
Abstract Considerable improvements have been made in the analysis of elastomer blends for composition, morphology and filler inter-phase distribution. GC, IR, NMR and thermal analysis (DTG, DSC, TG) techniques can provide quantitative information on composition. The latter three methods, along with SAXS, SANS, DMTA an…
We study electronic properties of the energy spectrum in a one-dimensional tight-binding model with site energies arranged in the Thue-Morse sequence. Using the trace map, we obtain the branching rules of the spectrum and perform a scaling analysis of bandwidths. It is shown that the spectrum consists of absolutely co…
Abstract Fibers (strands) with various draw ratios were spun from the liquid crystalline state of a pure aromatic liquid crystalline copoly(ester amide) and the melts of its blend with polycarbonate. Scanning electron microscopy (SEM), wide angle X‐ray scattering (WAXS), and differential scanning calorimetry (DSC) wer…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrientational relaxation in electric field poled guest-host and side-chain polymers below TgC. A. Walsh, D. M. Burland, V. Y. Lee, R. D. Miller, B. A. Smith, R. J. Twieg, and W. VolksenCite this: Macromolecules 1993, 26, 14, 3720–3722Publication Date (Print):July 1, 1993Publ…
X-ray reflectivity is a powerful technique to study electron density profiles in the direction normal to the surface of a fiat sample. As usual in scattering experiments, where the phase information is lost, it is necessary to build a model that can be used to calculate the reflectivity for comparison with the measure…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochromic and gas adsorption properties of Langmuir-Blodgett films of lutetium bisphthalocyanine complexesM. L. Rodriguez-Mendez, R. Aroca, and J. A. DeSajaCite this: Chem. Mater. 1993, 5, 7, 933–937Publication Date (Print):July 1, 1993Publication History Published onli…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSoluble polyimides with polyalicyclic structure. 1. Polyimides from bicyclo[2.2.2]oct-7-ene-2-exo,3-exo,5-exo,6-exo-tetracarboxylic 2,3:5,6-dianhydridesSumio Itamura, Masao Yamada, Shinji Tamura, Toshihiko Matsumoto, and Toshikazu KurosakiCite this: Macromolecules 1993, 26,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCoalescence dynamics of deformable Brownian emulsion dropletsK. D. Danov, N. D. Denkov, D. N. Petsev, I. B. Ivanov, and R. BorwankarCite this: Langmuir 1993, 9, 7, 1731–1740Publication Date (Print):July 1, 1993Publication History Published online1 May 2002Published inissue 1…
We study the martensitic phase transformation in ${\mathrm{Ni}}_{\mathit{x}}$${\mathrm{Al}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$ in the composition range 0.60x0.66 with the quasiharmonic approximation and molecular dynamics. These alloys present a high-temperature bcc phase (austenite) transforming at low temperature…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDoping-induced strain in polyaniline: stretchoelectrochemistryTimothy E. Herod and Joseph B. SchlenoffCite this: Chem. Mater. 1993, 5, 7, 951–955Publication Date (Print):July 1, 1993Publication History Published online1 May 2002Published inissue 1 July 1993https://pubs.acs.o…
Abstract A recently proposed model for quantitative analysis of reflection electron energy‐loss spectra (REELS) has been applied to evaluate the dielectric loss function of Si and SiO 2 in the 4‐100 eV energy range, and to determine inelastic scattering properties for these materials for low‐energy electrons (500‐1000…
The development of structure-reactivity relationships has been a long-standing goal of surface science studies. Ironically, though they have been considered much less often than metals, metal oxides appear to offer some of the best opportunities for developing such relationships. The localized electronic structure of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochemistry of phosphate esters: .alpha.-keto phosphates as a photoprotecting group for caged phosphateRichard S. Givens, Phillip S. Athey, Bogdan Matuszewski, L. William Kueper III, Jieyou Xue, and Thomas FisterCite this: J. Am. Chem. Soc. 1993, 115, 14, 6001–6012Publica…
There is recent evidence that united atom CH2 Lennard-Jones nonbonded potentials commonly used for molecular dynamics simulations for liquid polymers such as polyethylene are inadequate in some important respects. In the present work a united atom potential incorporating an offset of its center from the carbon atoms (…
Transparent and crackfree SrTiO3 thin films were deposited on silicon wafers, fused silica, and stainless-steel substrates by sol-gel technique. Strontium ethyl hexanoate and titanium isopropoxide were used as starting materials. The surface topology of the films were studied by electron micrography and the structural…
We investigate the phase diagram of two-dimensional binary mixtures of hard dises. There are two parameters in the problem, the ratio r of the radii of the two dises, and the concentration p of smali dises. We determine the possible phases by trying different periodic structures and minimizing the area per particle of…