Materials Literature
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: 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…
Detection of chemical agents as poisons in water supplies not only requires microg/L sensitivity, but also requires the ability to distinguish their hydrolysis products. We have been investigating the ability of surface-enhanced Raman spectroscopy (SERS) to detect chemical agents at these concentrations. Here we expan…
Present-day multimedia strongly relies on re-writable phase-change optical memories. We find that, different from current consensus Ge 2 Sb 2 Te 5 (GST), the material of choice in digital versatile discs–random access memory (DVD-RAM), possesses a structure similar to ferroelectric GeTe, namely that Ge and Sb atoms ar…
We have adapted an advanced semistochastic evolutionary algorithm for constrained multiobjective optimization and combined it with experimental testing and verification to determine optimum concentrations of alloying elements in heat-resistant austenitic stainless steel alloys and superalloys that will simultaneously…
A proton-conductive electrolyte based on a CsH 2 PO 4 ∕ SiP 2 O 7 composite was synthesized, and its electrochemical properties were investigated in the temperature range of 110-287°C. Addition of SiP 2 O 7 as supporting matrix brought about the structural change of conduction phase, CsH 2 PO 4 , into CsH 5 ( PO 4 ) 2…
The reversible modulation of the emission of CdSe/ZnS semiconductor nanocrystals (quantum dots) was achieved by binding photochromic diheteroarylethenes and switchable acceptors for fluorescence resonance energy transfer. A biotinylated diheteroarylethene derivative was bound to quantum dots bearing conjugated strepta…
Cholesteric liquid crystals (CLCs) are one dimensional photonic band-gap materials. Due to distributed feedback, low threshold mirrorless lasing can occur in dye-doped and pure CLCs. In order to optimize the lasing conditions, we have studied the dependence of the lasing threshold on dye concentration and sample thick…
Intense plastic deformation during equal–channel angular extrusion (ECAE) can occur in a broad region at the channel die intersection called the plastic deformation zone (PDZ). When the outer corner of the ECAE die is rounded, PDZs deviate from the model of single–plane simple shear, causing flow to be inhomogeneous.…
The technologically important S-phase precipitate MgCuAl 2 has been synthesized from the elements in a sealed tantalum tube in an induction furnace. The aluminide was investigated by powder and single crystal X-ray diffraction methods: Cmcm, a = 401.19(9), b = 926.5(2), c = 712.4(1) pm, wR2 = 0.0425, 234 F 2 values, a…
The kinetic theory of strength formulated by Zhurkov is expanded to include an energy consumption analysis of the processes of deformation and fracture of solids and their compounds. The dependence of the kinetics of the structure defect formation and of chemical reactions in the processes of deformation and fracture…
The repair and regeneration of damaged or resected bone are problematic. Bone autografts show optimal skeletal incorporation, but often bring about complications. Hence, there is increasing interest in designing new biomaterials that could potentially be used in the form of scaffolds as bone substitutes. In this study…
Tritium permeation can be significantly reduced by a suitable barrier on the structural materials of a future fusion power plant. Since alumina has the capability of tritium permeation reduction, the development of such coatings on ferritic martensitic steels by different techniques like hot-dip aluminizing (HDA) by F…
Abstract The spatial evolution of compositions and sub‐structures inside focused‐electron‐beam‐deposited tips from dicobalt‐octacarbonyl Co 2 (CO) 8 precursor at 25 keV and varying beam current (20 pA – 3 μA) is extensively studied for the first time by means of energy dispersive X‐ray spectroscopy, transmission elect…