Materials Literature
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X‐ray investigations of nine smectogenic substances exhibiting the smectic Ad, A1 and crystalline E phases were performed at various temperatures. X‐ray patterns yielded the layer thickness d (Ad, A1 phases) and orthorhombic unit cell parameters (E phase). The layer thickness of the Ad phase in 4′‐n‐alkyl‐4‐cyanobiphe…
The conditions for reliable preparation of bulk PB‐1 samples in form III were established. The crystal structure of solution‐prepared PB‐1 samples was measured by X‐ray diffraction as a function of solvent used, solution concentration, temperature of solution preparation, and solvent evaporation or solution precipitat…
Forced convection cooling of a personal computer microprocessor, using power generated by thermoelectric (TE) conversion, has been modeled, analyzed, and demonstrated. This study was motivated by the desire to meet the demanding cooling requirements of notebook computers without consuming valuable battery power. The m…
Abstract This paper reviews some of the recent developments of microcellular injection molding, which is capable of producing parts with excellent dimensional stability using lower injection pressure, shorter cycle time, and less material. Process conditions as well as nano/micro-fillers such as nanoclay and core–shel…
The advantages of the grafting-to approach for the formation of tethered polymer layers, or polymer brushes, include construction under ambient conditions, precise control of polymer molecular weight, and control of dispersity. These advantages are counterbalanced by the relatively low grafting density typically achie…
Using a coarse-grained model we perform a Monte Carlo simulation of the state behavior of an individual semiflexible macromolecule. Chains consisting of N = 256 and 512 monomer units have been investigated. A recently proposed enhanced sampling Monte Carlo technique for the bond fluctuation model in an expanded ensemb…
The use of lithium ceramic pebble beds has been considered in many blanket designs for the fusion reactors. Lithium ceramics have received a significant interest as tritium breeders for the fusion blankets during the last three decades. The thermal performance of the lithium ceramic pebble beds plays a key role for th…
Reactions between CuCl2 and K2tcpd (tcpd2- = [C10N6]2- = (C[C(CN)2]3)2-) in the presence of neutral co-ligands (bpym = 2,2'-bipyrimidine, and tn = 1,3-diaminopropane) in aqueous solution yield the new compounds [Cu2(bpym)(tcpd)2(H2O)4] x 2H2O (1), [Cu(tn)(tcpd)] (2), and [Cu(tn)2(tcpd)] x H2O (3), which are characteri…
The ligand 1,2-bis(benzimidazol-2-yl)-1,2-ethanediol (H2bzimed, 1) and its N-methylated analogue (H2mbzimed, 2) form a variety of polynuclear complexes with copper(II), all of which contain a planar Cu2O2 lozenge as a central element and in which the bridging oxygen belongs to an alkoxo group of the ligand. Syntheses…
The crystallization and melting behavior of poly(ε-caprolactone) (PCL) in a physically confined system, self-assembly blends of poly(ε-caprolactone)/polystyrene- b -poly(ethylenepropylene) (PCL/PS−PEP), were studied by differential scanning calorimetry (DSC). The glassy PS-rich phases effectively confine the PCL cryst…
In this work, adsorption of hydrogen on Al13 clusters has been investigated theoretically using the density functional theory (DFT) approach. We have performed geometry optimization of atomic and molecular hydrogen in the proximity of Al13 and calculated the binding energy and electronic properties of the stable Al13+…
1. The diatom flora of the Falkland Islands was investigated by sampling twenty-eight representative lake, pond and stream habitats. Diatom assemblages were moderately diverse and dominated by benthic taxa characteristic of oligotrophic soft waters.2. Particularly the Fragilarioid and Achnanthoid taxa possessed unusua…
: In the present work, banana, hemp, and sisal fibers are employed as fillers for the formation of natural fiber:polystyrene composites in the ratios of 55:45, 50:50, 45:55, and 40:60 (wt/wt). The natural fibers were treated with maleic anhydride. The Young's modulus, flexural modulus, impact strength, and Shore-D har…
Abstract The structures of oxides formed in water and lithiated water on three Zr-based alloys with varied corrosion behavior were studied with micro-beam synchrotron radiation and optical microscopy. Micro-beam synchrotron radiation (0.2 μm spot) has a unique combination of high elemental sensitivity (ppm level) and…
Clay minerals associated with the unconformity-type uranium deposits of the East Alligator Rivers uranium field have been used to determine the spatial distribution of hydrothermal alteration and the conditions of uranium deposition within the altered basement underlying the Kombolgie unconformity. Alteration develops…
Abstract Michael additions were achieved quantitatively at room temperature with a broad spectrum of acceptors and donors, using a magnesium‐lanthanum mixed oxide, a strong solid base. The best solvent for the reaction is dimethylformamide, but good yields were also obtained using toluene as solvent. The results obtai…
ADVERTISEMENT RETURN TO ISSUEPREVNoteA Highly Regular Hexagonally Perforated Lamellar Structure in a Quiescent Diblock CopolymerYueh-Lin Loo, Richard A. Register, Douglas H. Adamson, and Anthony J. RyanView Author Information Department of Chemical Engineering, Princeton University, Princeton, New Jersey 08544 Princet…
The complexation of poly(anilineboronic acid) with β-nicotinamide adenine dinucleotide (NADH) and its oxidized form, NAD +, has been investigated using electrochemical and spectroscopic techniques. At neutral pH, cyclic voltammetry of poly(anilineboronic acid) exhibits redox activity in the presence of NADH and NAD +…
NdFeB sintered magnets are widely used in rotating electrical machines. In order to develop an efficient rotating machine, it is important to estimate ac loss of the permanent magnet of rotor precisely. In this paper, the ac losses of the permanent magnet of IEEJ model (surface permanent-magnet motor model) are examin…
A series of achiral 4-biphenyl carboxylic acid compounds (BPCA-C n -P m OH) connected with alkoxyl chains having various carbon numbers ( n = 6−10) and terminated by phenyl groups with meta-positioned hydroxyl groups was synthesized. Different phase structures including nematic, smectic A (SmA), smectic C (SmC), and h…