Materials Literature
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We apply Gans theory to fit the absorption spectra of gold nanorods with aspect ratios R ≤ 2.5 in solution using both the longitudinal and transversal surface plasmon resonance absorption peaks and the dielectric constant of the medium, ε m, as a fitting parameter. By fitting the broadened absorption peaks using the a…
Poly(acrylic acid) forms insoluble hydrogen-bonded interpolymer complexes with methylcellulose in aqueous solutions under acidic conditions. In this work the reaction heats and binding constants were determined for the complexation between poly(acrylic acid) and methylcellulose by isothermal titration calorimetry at d…
Abstract The model of the molecular weight distribution (MWD) of polypropylene produced in a loop reactor is established. The simulated MWD data of the polymers produced in steady‐state polymerizations agree with the actual data collected from certain plant. The simulated weight‐average molecular weight data also agre…
Abstract The cure characteristics and physicomechanical properties of natural rubber (standard Nigerian rubber) vulcanizates filled with the fiber of bowstring hemp ( Sansevieria liberica ) and carbon black were investigated. The results showed that the scorch and cure times decreased, whereas the maximum torques incr…
Raman scattering measurements of vitreous ${\mathrm{SiO}}_{2}$ were performed over a wide range of temperatures in order to study the behavior of the boson peak and the quasielastic scattering. The analysis of quasielastic contribution in the framework of the J\"ackle model demonstrates that the quasielastic excess an…
Poly(oxyethylene) alkyl ether (CnEOm) is intercalated into the interlayer space of a layered silicate kanemite by using layered hexadecyltrimethylammonium (C16TMA) intercalated kanemite (C16TMA-kanemite) as the intermediate. C16TMA-kanemite was treated with an aqueous solution of C16EO10, and the intercalation of C16E…
The dispersion of fillers in polymers is generally associated with an improvement of at least some of the properties (mechanical, thermal, electrical, etc.) of the corresponding macromolecular material. These phenomena are known to result from the interactions, which take place at the molecular level between the polym…
Abstract Nanocomposites based on poly(iminosebacoyl iminodecamethylene) (PA1010) and multiwall carbon nanotubes (MWNTs) were successfully prepared by melt blending technique. environmental scanning electron microscope micrographs of the fracture surfaces showed that not only is there an evenly dispersion of MWNTs thro…
Abstract The present paper summarizes an experimental study on the molten viscoelastic behavior of HDPE/sisal composites under steady and dynamic mode. Variations of the melt viscosity and die swell of the composites with an increase in shear rate, fiber loading, and coupling agent concentration have been investigated…
Abstract The effects of clay on the morphology of the poly(acrylonitrile‐butadiene‐styrene) (ABS)/polypropylene (PP) nanocomposites were investigated. From the studies of wide angle X‐ray diffraction (WAXD) and transmission electron microscopy (TEM) analysis of the ABS/PP (70/30) nanocomposites with clay, it was obser…
We present here the synthesis and structural characterization of hybrid Au-polypyrrole-Au and Pt-polypyrrole-Au nanowires together with a study of their electrical properties from room temperature down to very low temperature. A careful characterization of the metal-polymer interfaces by transmission electron microsco…
We have studied the effects of p-type chemical doping with F 4 TCNQ (tetrafluorotetracyano- p -quinodimethane) in carbon nanotube field-effect transistors (CNFETs). The transmission-line-model technique using multi-probe CNFETs has been employed to investigate the effects of chemical doping on the channel resistance a…
We observed two-dimensional (2D) nucleation behavior on {110} and {101} faces of tetragonal crystals of model protein lysozyme by laser confocal microscopy combined with differential interference contrast microscopy (LCM-DIM). We measured, for the first time directly and noninvasively, the 2D nucleation rates using 99…
Synthetic mineral libethenite Cu(2)PO(4)OH was prepared by the hydrothermal method, and its structure at 200 K was refined by single-crystal X-ray diffraction. The structure of Cu(2)PO(4)OH is built up from Cu2(2)O(6)(OH)2 dimers of edge-sharing Cu2O(4)(OH) trigonal bipyramids and [Cu1(2)O(6)(OH)(2)] proportional chai…
Spider dragline silk as a protein fiber can be pictured as the oriented organization of protein nanocrystals along the long axis with their spacing filled by amorphous protein domains. We used the surface of the spider dragline silk as a biological template to nucleate bone mineral hydroxylapatite (HAP) site-specifica…
Abstract Montmorillonite (MMT) was modified with carboxymethylcellulose (CMC). The X‐ray diffraction (XRD) and FTIR analyses showed that the CMC chains had intercalated into the MMT sheets, and the strong chemical interaction between the ether bonds from CMC and SiO bonds from MMT was the driving force for intercalat…
The local structure of ordered mesoporous iron phosphate, prepared through coassembly of inorganic species and sodium dodecyl sulfate template under the assistance of HF, has been investigated with several physicochemical methods, including small-angle XRD, TG-DSC, and combined spectroscopic characterization of FT-IR,…
Cobalt−ferrite nanocrystals were synthesized using a high-temperature organometallic decomposition scheme in the presence of surfactant molecules. The influence of the addition of cosurfactant molecules of polyol type on the resulting nanocrystals was examined. The properties of the nanocrystals were studied using ele…
Spiders and their silk are an excellent system for connecting the properties of biological materials to organismal ecology. Orb-weaving spiders spin sticky capture threads that are moderately strong but exceptionally extensible, resulting in fibers that can absorb remarkable amounts of energy. These tough fibers are t…
Field-dependent ac susceptibility and low field $(<150\phantom{\rule{0.3em}{0ex}}\mathrm{Oe})$ magnetization measurements on single crystal ${\mathrm{La}}_{0.73}{\mathrm{Ba}}_{0.27}\mathrm{Mn}{\mathrm{O}}_{3}$ reveal features consistent with the appearance of a Griffiths phase in the temperature interval between ${…