Materials Literature
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This paper describes the use of surface plasmon resonance spectroscopy and self-assembled monolayers (SAMs) of alkanethiols on gold to evaluate the ability of surfaces terminating in different combinations of charged groups to resist the nonspecific adsorption of proteins from aqueous buffer. Mixed SAMs formed from a…
We present experimental scattering data at microwave frequencies on a structured metamaterial that exhibits a frequency band where the effective index of refraction (n) is negative. The material consists of a two-dimensional array of repeated unit cells of copper strips and split ring resonators on interlocking strips…
Abstract In the area of beverage packaging, the barrier properties (to gases, water, organic vapors/flavors) are parameters of great importance. For poly(ethylene terephtalate) (PET), largely used in bottling, the improvement of these barrier properties upon biaxial orientation is a direct result of both the level of…
An associating amphiphilic polyelectrolyte was used as an emulsifier of the n -dodecane−water system. First, the dynamic rheological behavior of polydisperse concentrated direct emulsions with dispersed phase volume fractions up to 0.91 was investigated. Both the Princen and Kiss ( J. Colloid Interface Sci. 1983, 91,…
${\mathrm{Ni}}_{80}{\mathrm{Fe}}_{20}/{\mathrm{Sm}}_{40}{\mathrm{Fe}}_{60}/{\mathrm{Ni}}_{80}{\mathrm{Fe}}_{20}$ trilayers with in-plane uniaxial anisotropy induced by an applied magnetic field during deposition were prepared on (100)-Si substrates by dc magnetron sputtering. Magnetization hysteresis loops were measur…
The part played by the electronic interactions in the uncommon “neutral-to-ionic” (N-I) structural transition occurring in some mixed stack organic compounds, such as tetrathiafulvalene-chloranil (TTF-CA), is analyzed by ab initio electronic structure calculations. It is shown that the charge-transfer variation occurr…
Abstract A new kind of blends of polyvinyl chloride (PVC)/nylon terpolymer was reported in this article. Two compatibilizers were used in this study: one is a terpolymer of ethylene– n ‐butyl acrylate–monoxide (EnBACO); the other is terpolymer of EnBACO grafted with maleic anhydride (EnBACO‐ g ‐MAH). The observation o…
We report measurements and quantitative data analysis on the low-temperature resistivity of several ferromagnetic manganites. We clearly show that there exists a ${T}^{4.5}$ term in low-temperature resistivity, and that this term is in quantitative agreement with the quantum theory of two-magnon scattering for half-me…
Abstract The shear‐induced crystallization behavior of PET was investigated by measuring the time‐dependent storage modulus ( G ′) and dynamic viscosity (η′) with a parallel‐plate rheometer at different temperatures and shear rate. The morphology of shear‐induced crystallized PET was measured by DSC, X‐ray, and polari…
Bile acids have been used for the first time as the building block for the construction of dendritic units. Orthogonally functionalized 7-deoxycholic and cholic acid derivatives were synthesized. The construction of a bile acid heptamer, a nonamer, and a decamer using the convergent strategy are described in detail. C…
This paper reports polarization-resolved temperature-dependent Raman scattering measurements on single crystals of the orthorhombic perovskite colossal-magnetoresistive material La 1- x Ca x MnO 3 , with x = 0.1,0.275,0.3. It is demonstrated that two of the Raman lines undergo an anomalous softening as temperature is…
Poly(silyl ester)s with differing compositions and architectures were synthesized via cross-dehydrocoupling polymerizations of AB and AB 2 monomers. Three poly(silyl ester)s linear poly(dimethylsilyl benzoate), linear poly(diisopropylsilyl benzoate), and hyperbranched poly(dimethylsilyl benzoate) were synthesized thro…
We show that the so-called original expression for a dilute random medium derived recently by Skipetrov [Phys. Rev. B 60, 12 705 (1999)] is apparently just the well-known Maxwell-Garnett formula. By comparing another of Skipetrov's original expressions and the Maxwell-Garnett formula and its extensions, we notice that…
Treatment of lanthanum metal with CH2Br2 or CH2I2 in tetrahydrofuran (thf) under ultrasound conditions yields the corresponding [LaX3(thf)4] (X = Br, I) complexes in good yield. Recrystallization of [LaBr3(thf)4] from 1,2-dimethoxyethane (dme) or bis(2-methoxyethyl) ether (diglyme) generates [LaBr2(µ-Br)(dme)2]2 and […
Abstract Polypropylene films with various amine groups were prepared by radiation‐induced grafting of glycidyl methacrylate (GMA) onto polypropylene (PP) films and the subsequent amination of poly‐GMA graft chains were examined. The physical and chemical properties of the GMA‐grafted PP film and the aminated PP film w…
For better understanding of the charge-transport mechanisms in perovskite manganites, along with colossal magnetoresistance (CMR) materials, such as ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{MnO}}_{3},$ we study systems with decreased content of Mn ions, such as single crystals of ${\mathrm{LaGa}}_{1\…
Abstract The composition of the high molecular weight tail in branched low‐density polyethylenes made by both tubular and autoclave reactors was studied in detail using size‐exclusion chromatography (SEC) coupled with a viscosity detector (VD) and a two‐angle light‐scattering detector (LSD). The detection of a second…
Three AB-type polyimides with para-, meta- and ortho-linked main chain units based on hydroquinone, resorcinol and catechol, were synthesized and characterized. The polyimides were prepared in two steps by the direct polycondensation reactions of isomeric monomers, 4-(4-aminophenoxy)diphenyl ether-3‘,4‘-dicarboxylic a…
Abstract Conifer fibers were used to reinforce polypropylene (PP). To improve the compatibility between the conifer fibers and the PP matrix, the fibers were either grafted with maleated PP (MAPP), treated by adding MAPP, or mixed with ethylene/propylene/diene terpolymer (EPDM). The treatments resulted in improved pro…
A monolayer of conducting polymer, polyaniline (PAN), was assembled on hydroxyl-terminated surfaces, such as quartz, glass, indium−tin oxide, and native oxide on Si. The approach for assembling two-dimensional monolayers of PAN is based on a chemical or electrochemical surface polymerization of electrostatically bound…