Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Laser-induced reorientation was studied in absorbing nematic films. The optical Freedericksz threshold occured at an intensity level of 50 W/cm2 in contrast to the normally observed few KW/cm2 value for transparent layers. Thermomechanical coupling is considered as a possible explanation of the observed anomaly.
The crystallization of lithium disilicate (Li 2 O·2SiO 2 ) glass nucleated at various temperatures was studied by differential thermal analysis (DTA). A plot of the DTA crystallization peak height versus nucleation temperature closely resembles the classical nucleation rate curve for lithium disilicate glass whose max…
Abstract Analytical and high-resolution transmission electron microscopy of weathered plagioclase and K-feldspar provided microtextural and chemical data that suggest a sequential formation of weathering products. An alteration layer < 1 µ m thick on feldspar surfaces had short-range order and was termed protocryst…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStress relaxation in the lamellar copolymer mesophaseT. A. Witten, L. Leibler, and P. A. PincusCite this: Macromolecules 1990, 23, 3, 824–829Publication Date (Print):February 1, 1990Publication History Published online1 May 2002Published inissue 1 February 1990https://pubs.a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotovoltaic effect in symmetrical cells of a liquid crystal porphyrinBrian A. Gregg, Marye Anne. Fox, and Allen J. BardCite this: J. Phys. Chem. 1990, 94, 4, 1586–1598Publication Date (Print):February 1, 1990Publication History Published online1 May 2002Published inissue 1…
A review of the results of studies on the structure, phase transitions and physical properties of alkylammonium halogenoantimonates (III) and bismuthates (III) is presented. The crystals of these compounds are characterized by a variety of anionic structures and show a number of phase transitions including those to po…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of cadmium sulfide in situ in reverse micelles. 2. Influence of the interface on the growth of the particlesC. Petit, P. Lixon, and M. P. PileniCite this: J. Phys. Chem. 1990, 94, 4, 1598–1603Publication Date (Print):February 1, 1990Publication History Published on…
The earlier stage of the polymerization reaction of polyaniline has been studied employing in situ spectroelectrochemical techniques. The results indicate that the nitrene cation appears to be a key intermediate species, which leads to all three possible dimers including a head‐to‐tail dimer (N‐phenyl‐p‐phenylenediami…
Protein N-myristoylation refers to the covalent attachment of a myristoyl group (C14:0), via amide linkage, to the NH2-terminal glycine residue of certain cellular and viral proteins. Myristoyl-CoA:protein N-myristoyltransferase (NMT) catalyzes this cotranslational modification. We have developed a system for studying…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemical and electrochemical copolymerization of aniline with alkyl ring-substituted anilinesYen Wei, Ramakrishnan Hariharan, and Sandeep A. PatelCite this: Macromolecules 1990, 23, 3, 758–764Publication Date (Print):February 1, 1990Publication History Published online1 May…
<div class="htmlview paragraph">Several different possibilities will be described and discussed on the processes of reducing NOx in lean-burn gasoline and diesel engines.</div> <div class="htmlview paragraph">In-company studies were conducted on zeolitic catalysts. With lean-burn spark-ignition engin…
Abstract Starburst‐Dendrimere sind dreidimensionale, hoch geordnete oligomere und polymere Verbindungen, die ausgehend von kleinen Molekülen – „Initiatorkernen”︁ wie Ammoniak oder Pentaerythrit – durch eine sich ständig wiederholende Reaktionsfolge entstehen. Bei den Synthesen, bei denen Schutzgruppentechniken von ent…
Glasses have nonzero zero-temperature entropies. Because they are out of equilibrium, the ``thermodynamic'' entropy, determined by heat flow, is not equal to the ``statistical'' entropy, which measures volumes in phase space. We discuss the relationship between the two kinds of entropy in nonequilibrium systems and sh…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation of aromatic polyamide polyanions: a novel processing strategy for aromatic polyamidesRobert R. Burch, Wilfred Sweeny, Hans Werner Schmidt, and Young H. KimCite this: Macromolecules 1990, 23, 4, 1065–1072Publication Date (Print):February 1, 1990Publication History…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIn situ measurement of the conductivity of polypyrrole and poly[1-methyl-3-(pyrrol-1-ylmethyl)pyridinium]+ as a function of potential by mediated voltammetry. Redox conduction or electronic conduction?Huanyu Mao and Peter G. PickupCite this: J. Am. Chem. Soc. 1990, 112, 5, 1…
The behaviour of concentric double emulsion droplets in linear flows is examined analytically, for the case when both fluid–fluid interfaces remain nearly spherical, and numerically, for the effect of finite interface deformation. The theoretical analysis is used to calculate the velocity fields interior and exterior…
Abstract Polystyrene/polystyrene latex interpenetrating polymer networks (IPNs) were prepared by seeded emulsion polymerization of styrene–divinylbenzene mixtures in crosslinked monodisperse polystyrene particles. The resulting latexes comprised uniform nonspherical particles, e.g., ellipsodal and egg‐like singlets, s…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEmulsion stability and rigid foams from styrene or divinylbenzene water-in-oil emulsionsJoel M. Williams, A. James Gray, and Mark H. WilkersonCite this: Langmuir 1990, 6, 2, 437–444Publication Date (Print):February 1, 1990Publication History Published online1 May 2002Publish…
By measuring contact angles with water, glycerol and formamide on a number of polar surfaces, an estimate could be made of the electron-acceptor (γ+ ) and the electron-donor (γ− ) parameters of glycerol (G) and formamide (F), relative to the parameters of. water (W), for which a reference value of γ+ W = γ− W = 25.5 m…
The plasma‐enhanced chemical vapor deposition process for SiN x H y films has been in use for over two decades, but the chemistry of the process has yet to be explained. In the present work, the composition of a 13 MHz NH 3 ‐ SiH 4 parallel plate glow discharge plasma was analyzed by line‐of‐sight sampling from the fi…