Materials Literature
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We present a novel subpicosecond optical transient-reflection method, which employs the surface-plasmon resonance of a thin silver film as a very sensitive probe to study small transients of the effective electron and lattice temperature. By measuring under surface-plasmon resonant and nonresonant conditions, we can d…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConducting polymer blends: polythiophene and polypyrrole blends with polystyrene and poly(bisphenol A carbonate)Hsing Lin Wang, Levent Toppare, and Jack E. FernandezCite this: Macromolecules 1990, 23, 4, 1053–1059Publication Date (Print):February 1, 1990Publication History P…
Using perovskite‐type oxide based on as a solid electrolyte, small‐size high‐temperature fuel cells were constructed and cell performances were examined. The Nd‐doped ceramic electrolyte exhibited a mixed conduction of proton and oxide ion. Mixtures of water vapor and some gases such as methanol vapor or methane were…
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…