Materials Literature
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Abstract The addition of NO (0 to 400ppm) to mixtures of H 2 (ca. 1%) and O 2 (0.7 to 22%) has been studied over the temperature range 700 to 825 K, in a flow reactor at atmospheric pressure. The overall effect of NO is to promote the oxidation of H 2 but high concentrations of O 2 actually inhibit the NO‐promoted oxi…
Calponin from chicken gizzard induced polymerization of actin in the presence of 10 mM KCl. Only 2 min after the addition of KCl in the presence of a 0.0625-0.25:1 molar ratio of calponin to actin, a Poisson-type length distribution (with an average length of approx. 0.7 micron) was observed with formed actin filament…
This paper presents a review of the work on the molecular design of liquid crystals for active matrix displays (AMLCDs), thin-film-transistor-polymer dispersed liquid crystal displays (TFT-PDLCDs) and examines in some detail the relationships between liquid crystalline molecular structures and their physico-chemical p…
Epoxy resin coated electrode specimens were subjected to partial discharges (PD) in air at twice the discharge inception voltage for durations ranging to 5000 h. The PD behavior was characterized by a transition from initially large pulse type discharges (- 200 to 300 pC) to either small pulse (- 1 pC), pseudoglow, gl…
Readout characteristics have been investigated with a superlow-power readout method in order to solve the problem of information destruction caused by repeated readout operations in photon-mode photochromic memories. For ordinary photochromic diarylethene media, it was possible to read signals of about 10 5 –10 6 cycl…
Microstructure shape of “crystal-originated particles” (COP's) on mirror-polished silicon wafers (a) as received, (b) cleaned with NH 4 OH/H 2 O 2 /H 2 O solution (SC-1), and (c) annealed at high temperature (∼1150° C) in O 2 /N 2 mixture or in H 2 , were observed using a scanning electron microscope (SEM), transmissi…
Abstract Chiral polymethine dyes constitute a particular class of conjugated π systems. Artificial chiral polymethine dyes were first synthesized by König and Langbein in 1928 in order to clarify the electronic structure of cyanine dyes; some natural dyes such as musca‐aurin I (from the toadstool fly agaric) and betan…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMicrocalorimetric Studies of CO and H2 Adsorption on Nickel Powders Promoted with Potassium and CesiumB. E. Spiewak, J. Shen, and J. A. DumesicCite this: J. Phys. Chem. 1995, 99, 49, 17640–17644Publication Date (Print):December 1, 1995Publication History Published online1 Ma…
A method for solving the optical constants of a thin film on a slightly absorbing substrate is proposed. Using only a single-reflectance measurement together with the interference fringes, one can calculate with good accuracy the thickness and the real and imaginary parts of the refractive index of the film. Besides i…
A model to determine the influence of the phase and amplitude mismatching on the diffraction orders is proposed. The coupling between amplitude and phase in liquid crystal televisions (LCTV) is also considered. The effect on the impulse response of the nonlinearities is studied from experimentally determined amplitude…
We generalize the theory of diffusing-wave spectroscopy (DWS) to include the effects of fluctuations of the amplitudes of the scattered fields. Thus DWS can be used to probe the internal dynamics of flexible particles. We study the thermally induced shape fluctuations of monodisperse emulsion droplets as a function of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNylon 65 has a Unique Structure with Two Directions of Hydrogen BondsEloisa Navarro, Lourdes Franco, Juan A. Subirana, and Jordi PuiggaliCite this: Macromolecules 1995, 28, 26, 8742–8750Publication Date (Print):December 1, 1995Publication History Published online1 May 2002Pu…
In order to elucidate the role of the linkage region that connects polar headgroups with hydrophobic segments in a lipid monomer, cationic mixed-chain amphiphiles containing acyl and alkyl hydrophobic segments connected at the level of Me(2)N(+) headgroups 2a-d were synthesized. Related dialkyldimethyl-ammonium ion su…
Abstract Upper Cretaceous-Tertiary marine clayey-calcareous rocks of the Hekimhan basin contain fibrous clay minerals in significant amounts. Ophiolitic rocks in the provenance area have contributed the elements to form the clay minerals. XRD, SEM, major, trace and REE analyses were applied to samples taken from sever…
Abstract Polypropylene/Polyamide‐6 (PP.PA) blends containing maleic anhydride grafted elastomers were prepared by reactive blending. Three different types of core shell morphologies were obtained and characterized by transmission electron microscopy (TEM). The midulus of these elastomer midified PP/PA (70/30) blends w…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIncorporation of Pyrene into an Oriented Transparent Film of Layered Silica-Hexadecyltrimethylammonium Bromide NanocompositeMakoto OgawaCite this: Langmuir 1995, 11, 12, 4639–4641Publication Date (Print):December 1, 1995Publication History Published online1 May 2002Published…
A combination of static light scattering and video microscopy is used to perform high precision measurements on the growth velocity of body centered cubic (bcc) crystals in a metastable colloidal melt of monodisperse, highly charged latex spheres. The crystals nucleate heterogeneously at the walls of a flat flow-throu…
The effects of adding a diacrylate monomer or its polymerized network to a ferroelectric liquid crystal have been characterized. The monomer lowers the temperatures of transition to the more ordered phases, whereas the polymer network phase separates into polymer rich and LC rich phases and has little effect on the LC…
The triterpenes isolated from P. cocos and their derivatives were examined for anti-emetic activity. Some of these triterpenes inhibited emetic action induced by oral administration of copper sulfate pentahydrate to leopard frog. The triterpenes having an exomethylene group at C-24 showed anti-emetic activity to frogs.
Abstract Poly( L ‐lactide)‐ block‐ poly( L ‐amino acids) block copolymers were prepared via polymerization of α‐amino acid N ‐carboxyanhydrides with amino‐terminated poly( L ‐lactide)s as macroinitiators. Two types of macroinitiators were used, one with an aminopropoxy head group (number‐average molecular weight M n =…