Materials Literature
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Abstract Preparation of nanocomposites based on ethylene‐vinyl acetate copolymer (EVA) and organoclay by melt intercalation is described in this paper. Effects of VA content, melt flow index (MFI) and maleation of EVA on melt intercalation were investigated by X‐ray diffraction. The level of intercalation into the org…
Morphological and spectroscopic studies of Sr2CeO4 blue phosphor in the form of fine particles prepared from a powdered multi-component precursor, via a combustion method, are reported. Samples were also prepared through a solid-state reaction and from a polymeric precursor for comparison. Citric acid or glycine as fu…
Chromate conversion coating (CCC) protection of untreated and acid-pretreated 7xxx Al alloys with various Cu content in aerated chloride solution as well as the polarization behavior of as-polished alloys in deaerated chloride solution were investigated using polarization techniques in conjunction with metallography,…
We present optical measurements of phononic excitations in ${\mathrm{La}}_{2∕3}{\mathrm{Ca}}_{1∕3}\mathrm{Mn}{\mathrm{O}}_{3}$ (LCMO) and ${\mathrm{La}}_{2∕3}{\mathrm{Sr}}_{1∕3}\mathrm{Mn}{\mathrm{O}}_{3}$ (LSMO) thin films covering the full temperature range from the metallic ferromagnetic to the insulating paramagne…
Gradient-corrected periodic density functional theory was used to examine the bulk and low index surfaces of several cesium oxides (Cs 2 O, Cs 2 O 2, and CsO 2 ). The adsorption of CO 2 on those surfaces was explored. The cesium-terminated {001} surface of Cs 2 O had a weak affinity for CO 2 with an adsorption strengt…
A high-energy-density self-healing metallized film pulse capacitor is the key component of the inertial confinement laser fusion facility. The reliability level of capacitors is connected with operating reliability and maintenance expenses of the entire system. By analyzing the degradation mechanism and characteristic…
Abstract An experimental study on crystal structure and morphology of isotactic polypropylene (iPP) subjected to vibration was carried out on a laboratory apparatus. Crystallite size, crystal structure, and crystallinity of iPP under vibration or nonvibration were investigated through differential scanning calorimeter…
The polyhydroxyalkanoate synthesis operon was cloned from Aeromonas hydrophila CGMCC 0911. Heterogeneous expression of the cloned polyhydroxyalkanoate synthesis operon in Escherichia coli resulted in accumulation of poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) consisting of 13.9 mol % 3-hydroxyhexanoate up to 29.2 wt…
Abstract The study of high density polyethylene (HDPE)/ethylene‐vinyl acetate (EVA)/and organically‐modified montmorillonite (OMT) nanocomposites prepared by melt intercalation followed by exposure to gamma‐rays have been carried out. The morphology and properties of the nanocomposites were studied using X‐ray diffrac…
The 12Cr-oxide dispersion strengthened (ODS) ferritic steel is being developed as prospective cladding materials for attaining higher burnup and higher coolant outlet temperature in advanced fast reactor. Ductility and high temperature strength in the hoop direction can be attained by recrystallization in the manufact…
During the last 10 years, a new generation of work rolls has been introduced in hot strip mills. High speed steel (HSS) and enhanced indefinite chill (IC) rolls were introduced to replace high chromium (HiCr) rolls and IC rolls, respectively. Enhanced IC rolls have successfully replaced IC rolls in most mills, while H…
Abstract The shell thickness of a core/shell impact modifier is found to be the single most important factor in the toughening of rigid polyvinyl chloride (PVC). When the shell thickness is greater than a critical value of 15.8 nm, these core‐shell elastomeric particles are able to remain structurally intact and well…
This paper presents a new numerical scheme for simulating multidimensional transient and steady-state microscale energy transport. The new method is based on the method of characteristics that follows heat carriers along their pathline. Unlike traditional methods, it uses a fixed computational grid and follows the hea…
An achromatic infrared (lambda = 1.2-4 microm), Si-prism quarter-wave retarder (QWR) is described that uses total internal reflection at a buried Si-SiO2 interface at an angle of incidence phi near 33 degrees, where deltaDelta/deltaphi = 0. The retardance delta deviates from 90 degrees by < +/- 2 degrees within a fiel…
Abstract The reaction of the open‐structure anion [PW 9 O 34 ( t BuSiOH) 3 ] 3‐ with RSiCl 3 (R = (CH 2 ) n CH=CH 2 (n = 0, 1, 4)) affords [PW 9 O 34 ( t BuSiO) 3 (SiR)] 3‐ heterosilylated capped hybrid compounds. These complexes were characterized by infrared spectroscopy and in solution by multinuclear ( 1 H, 29 Si,…
Abstract Dinitrogen oxide was employed as a clean oxidant for various oxidations in the presence of a catalytic amount of dioxoruthenium tetramesitylporphyrin complex (Ru(tmp)(O)2). A variety of olefins, secondary alcohols, and benzyl alcohols were smoothly oxidized to the corresponding epoxides, ketones, and aldehyde…
Abstract We have investigated the nature of the interactions of n s 2 ‐cations and the possible structure‐determining role of the n s 2 electron pair at ambient and high pressure in several AB 2 X 5 (A = K, Rb, Cs, In, Tl; B = Sn, Pb, Sr; X = Cl, Br, I) compounds. Structural parameters are obtained by high pressure x‐…
A novel perfluoroalkyl-containing multi-epoxy compound (PFME), designed and syn thesized in our laboratory, is applied to cotton fabrics by the pad-dry-cure process to give durable water and oil repellency by developing permanent covalent bonds to the textile substrate. The specimens pretreated by citric acid are furt…
Apatites from several pegmatites and two alkaline igneous environments were analyzed by electron microprobe and by micro-FTIR spectroscopy in the region 3000.4000 cm -1 . Hydrogen bonding between OH and adjacent halogens shifts the OH-stretching modes and proves sensitive to the ordering of anions and cations within t…
Abstract The application of supercritical carbon dioxide (SCCO 2 ) has been attracting more and more attention, especially in the formation of polymer membranes. The membrane formation using SCCO 2 is analogous to conventional immersion precipitation process by using organic nonsolvent. Polylactide (PLA) membranes wer…