Materials Literature
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A major challenge in protein folding is to identify and quantify specific structural determinants that allow native proteins to acquire their unique folded structures. Here we report the engineering of a 52-residue protein (Ala-14) that contains exclusively alanine residues at the hydrophobic a and d positions of a na…
Abstract It is a common industrial practice to blend virgin polymer with the same recycled polymer coming from plastic scraps that, in general, has not undergone relevant degradation. In this work, the characteristics of blends of virgin and recycled polyamide have been considered by changing the amount of recycled po…
Aluminum titanate (AT) ceramic materials doped with alkali feldspar ((Na 0.6 K 0.4 )AlSi 3 O 8 ) have been prepared. These ceramics exhibited high sinterability, large resistance to thermal decomposition, and large flexure strength. The existence of liquid‐phase feldspar at sintering temperatures promoted the formatio…
Composites of TiN/TiB 2 were synthesized by a combustion process of BN, Ti in a nitrogen atmosphere. The effect of the BN/Ti ratio and the nitrogen gas pressure on the synthesis of these composites was investigated. Dense TiN/TiB 2 composites with relatively high hardness and toughness were fabricated by combustion sy…
Toroidal polyhex lattices have been proposed in the literature as models for the “circle crops” observed in soot condensed from arc-vaporized graphite. Other covering patterns, including azulenic C5C7, “bathroom floor” C4C8, and mixed patterns have been suggested. In this paper, novel phenylenic (PH) and naphthylenic…
Abstract Weathering of chlorite adjacent to macro- and micro-passages (fissures) in regolith units has been studied to determine the alteration mechanisms and products and compare them to those that prevail at a distance from the open passages. The micro-fissures in the saprolith units evolve as a function of weatheri…
Four new compounds, RbSiBiS(4), RbGeBiS(4), CsSiBiS(4), and CsGeBiS(4), have been synthesized by means of the reactive flux method. The isostructural compounds RbSiBiS(4), RbGeBiS(4), and CsGeBiS(4) crystallize in space group P2(1)/c of the monoclinic system with four formula units in cells of dimensions at 153 K of a…
Abstract A new carboxylated styrene‐butadiene rubber (CSBR) in ultrafine powder form was used to modify the properties of nylon 6. The nylon 6/CSBR blends possessed higher toughness than nylon 6/maleic anhydride‐grafted polyethylene‐octene elastomer (POE‐ g ‐MAH) system. TEM micrographs revealed the fine dispersion of…
Abstract Nanoscale alumina/protein gel composite films with 10–50 wt% filler were subjected to scratch testing and compared to micron‐scale alumina/protein gel composites. Atomic force microscopy (AFM) was employed to examine the width, depth, and morphology of the as‐produced scratches. The results show that the scra…
Abstract The reactivity of the calcination product of calcium magnesium acetate (CMA) as a possible dry desulfurization agent was evaluated. The first step in the dry desulfurization reaction—the thermal decomposition of CMA—was investigated by determining the decomposition reaction in three steps: 1. the evaporation…
Polyethylene having 1,2- or 1,3-disubstituted cyclopentane structures was prepared by copolymerization of ethylene and cyclopentene (CPE) or 1,5-hexadiene (HD), and the crystalline structure was studied. Treatment with fuming nitric acid preferentially degraded the amorphous phase of the copolymers, and the structure…
Abstract Chlorinated polyethylene has been demonstrated to be an effective compatibilizer for dissimilar materials in various mixed‐polymer or recycled‐polymer systems. In this paper the use of chlorinated polyethylene to compatibilize polymer/natural‐fiber composites is discussed. Examples of applications in PVC/wood…
Y3-xAl5O12: Cex3+ (YAG: Ce3+) thin-films were deposited by a pulsed-laser deposition method on quartz substrates using a solid YAG: Ce target. The films were analyzed by X-ray diffraction, scanning electron microscopy, photoluminescence (PL), and energy dispersive X-ray analysis (EDX). The as-deposited films were amor…
Nanopowders of Bi 2 Ti 2 O 7 were synthesized by a metallorganic decomposition (MOD) technique. Pure Bi 2 Ti 2 O 7 nanocrystals formed after annealing at 550°C for 5 min. X‐ray patterns show that Bi 20 TiO 32 is a metastable phase during Bi 2 Ti 2 O 7 formation. It was found that there were two peaks in the curves of…
In designing superconducting electrical power apparatus, the knowledge of cryogenic gas and liquid insulation characteristics is essential. The authors have studied the discharge characteristics of relatively long-gap configurations in air and nitrogen at a cryogenic temperature. A sphere-to-sphere electrode with a ga…
Abstract This paper investigates the electromagnetic interference shielding effectiveness (EMI SE) of injection molded ABS disks filled with stainless steel fibers (SSF) and nickel‐coated graphite fibers (NGF). The effects of fiber type, fiber length and weight percentage on SE were studied. Optical microscope (OM) an…
A soft chemistry route is described to obtain glasses in the P 2 O 5 –Na 2 O–ZnO–H 2 O. It is based on the addition of zinc salts to coacervates prepared from sodium polyphosphate. The processing of these coacervates leads to polyphosphate glasses with the same properties as those of glasses prepared in the classical…
The influence of the slenderness (shape effects) of a specimen in compression and of the friction between it and the loading platens on the dissipated energy density and on the compressive strength (strain-softening response) is theoretically and experimentally analysed. The energy dissipated during the process is ass…
Industrially processed duplex stainless steel sheet was investigated after the reheating, the roughing mill and the finishing rolling. Light optical microscopy revealed that the cast structure that existed before rolling was removed and changed into a banded microstructure. During the process, the ferrite-austenite vo…
This paper reports on work that should lead to real-time characterization of nonwovens as they are being produced. Statistical techniques and image processing techniques are employed. The initial results indicate the possibility of better process understanding and control. The goal of this work is to develop affordabl…