Materials Literature
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I report systematic first-principles calculations of the quaternary Heusler alloys, e.g. Co 2 [Cr 1− x Mn x ]Al, Co 2 Mn[Al 1− x Sn x ] and [Fe 1− x Co x ] 2 MnAl. I show that these alloys are also half-ferromagnets when the normal Heusler compounds corresponding to concentration values of zero and unity are half-meta…
Nanostructured and nanorod-shaped three-dimensional In2O3 were deposited on stainless steel (SS) by a novel potentiodynamic method at a high scan rate of 200 mV s-1. In2O3/SS electrodes were found to exhibit high specific capacitance, high power density, and long-term stability when used as active electrode materials…
A new Y−Fe alkoxide, [YFe(OPr i ) 6 (Pr i OH)] 2, is used in the sol−gel process to obtain the orthoferrite, YFeO 3 . The Y/Fe stoichiometry (1:1) and Y−O(R)−Fe chemical links in the single molecular precursor kinetically control the formation of metastable YFeO 3 which is otherwise difficult to prepare due to the eas…
Amphiphilic block copolypeptides were prepared through transition-metal-mediated polymerization of amino acid N -carboxyanhydrides. In aqueous solution these materials form strong hydrogels at low concentrations. The self-assembly process that is responsible for gelation was investigated by measuring the rheological p…
CO2 laser induced pyrolysis of silane was used to produce silicon nanoparticles with an average diameter as small as 5 nm at high rates (up to 200 mg/h). Etching these particles with a mixture of hydrofluoric acid (HF) and nitric acid (HNO3) reduces their size and passivates their surface such that they exhibit bright…
Wet chemical methods involving ultrasound and amide solvents were used to purify and separate large bundles of single-walled carbon nanotubes (SWNTs) into individual nanotubes that could then be transported to silicon or mica substrates. The SWNTs studied were produced by the arc-discharge process. Dry oxidation was u…
In this study, a flexible thermoelectric power generator has been proposed. The proposed thermoelectric power generator is composed of a polyimide sheet, a Ni-Cu thermopile on a polyimide sheet, and heat sink and heat absorber sheets. The flexible thermoelectric power generator has 60mm-length, 45mm-width and 3mm-heig…
Abstract Deproteinized natural rubber (DPNR) latex, prepared by digesting the protein within low‐ammonia preserved concentrated (NR‐LA) latex with alcalase enzyme at 40°C for 24 h, has the nitrogen content of 0.039 wt %. Poly(methyl methacrylate) (PMMA) and graft copolymers (DPNR‐ g ‐PMMA) latices were synthesized by…
Abstract Tensile tests on high‐impact polystyrene (HIPS) show that a 60 Mrad dose of γ‐radiation raises the yield stress from 11.5 to 19.8 MPa, and the flow stress from 10.0 to 19.6 MPa, while reducing the elongation at break from 50 to 4%. Similar reductions in fracture resistance are observed in irradiated Charpy im…
Thermal interface materials (TIMs) play a key role in the thermal management of microelectronic devices by providing a path of low thermal impedance between heat generating devices and heat dissipating components (heat spreader/sink). In addition, TIMs often provide mechanical coupling between the silicon device and t…
Abstract The isothermal crystallization behavior of polypropylene (PP) catalloys and neat PP were studied with differential scanning calorimetry and polarized optical microscopy (POM). The crystallization kinetics of the samples were described with the well‐known Avrami equation. The crystallization rate depended rema…
A method of determining the polar anchoring strength W d of a vertical alignment nematic liquid crystal-wall interface is proposed. W d is evaluated from the measurements of the optical retardation of a thin hybrid alignment nematic cell as a function of the wavelength of the incident light and cell rotating angles. A…
Abstract A conductive poly(aniline codoped with dodecyl benzene sulfonic acid and hydrochloric acid) [PANI‐D/H, yield: 32.2%, intrinsic viscosity ([η]): 1.39 dL/g, electrical conductivity: 7.3 S/cm] was synthesized by chemical oxidative polymerization from aniline‐dodecylbenzene sulfonic acid salt (A‐DS)/aniline‐hydro…
Cyclopentadienylmanganese complexes of the general formula (η 5 -C 5 H 4 CH 3 )Mn(CO) 2 L, where L is a nonchelatable, bifunctional ligand, were found to be photochromic. Irradiation of (η 5 -C 5 H 4 CH 3 )Mn(CO) 2 L(3-cyanomethylpyridine) with alternating visible and UV light produced alternating yellow and red solut…
A single-step approach for the synthesis of polyphosphazenes containing sulfonic acid functionalities is developed. Polyphosphazene “sulfonation” is conducted via the direct replacement of chlorine atoms of the macromolecular precursor, poly(dichlorophosphazene), PDCP with a sulfonic acid containing nucleophile hydrox…
Porous alumina films with controllable pore sizes and having submicrometer film thicknesses were fabricated by the anodization of Al overlayers. The Al was deposited by sputtering onto either glass or onto silicon that had been coated with a layer of silicon nitride. Alumina membranes having thicknesses between 300 an…
Abstract The kinetics of the hydroformylation of high‐molecular‐weight cis ‐1,4‐polybutadiene in the presence of HRh(CO)(PPh 3 ) 3 and monochlorobenzene as a solvent were studied. The degree of conversion was examined by spectroscopic characterization with Fourier transform infrared and 1 H‐NMR analysis. According to…
Abstract Conductive and flexible polydimethylsiloxane (PDMS)/polypyrrole (PPy) composites were synthesized electrochemically. Electrochemical syntheses were performed at +1.10 V by using p ‐toluene sulfonic acid (PTSA) as supporting electrolyte and water as solvent. Composites were characterized by cyclic voltammetry,…
Recombinant Escherichia coli harboring the medium-chain-length (MCL) polyhydroxyalkanoate (PHA) synthase gene has been shown to accumulate MCL-PHAs from fatty acids when FadB is inactive. However, the enzymes in fadB mutant E. coli responsible for channeling the beta-oxidation intermediates to PHA biosynthesis have no…
Widely well-aligned two-dimensional ZnO nanodot arrays ( e.g. , 40,000 nanodots of 130 nm diameter and 9 nm height over 150 ×150 µm 2 with a period of 750 nm) have been fabricated by metalorganic chemical vapor deposition on SiO 2 /Si substrates patterned by focused ion beam (FIB). A low-magnification FIB patterning m…