Materials Literature
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Abstract The mineralogical properties of goethite and clay minerals from the Shewushan supergene gold deposit have been studied using X-ray diffraction (XRD) and transmission electron microscopy (TEM). These results show that in the weathering zone of the Shewushan supergene gold deposit the mineral assemblage is main…
Clay that contains kaolinite has been used extensively as a raw material for manufacturing of bricks and china at 900-1100 degrees C. This study used clay to stabilize the contaminant chromium(VI) [Cr(VI)] through a heating process at 500-1100 degrees C. X-ray absorption spectroscopic results indicated that the 500-90…
Four homologous series belonging to the family of 4‐(4‐substituted phenylazo)‐1‐naphthyl 4‐alkoxybenzoates (I a–d) (C n H2 n +1O–C6H4–COO–C10H6–N = N–C6H4–X) were prepared in which the 4‐ substituent (X) was varied between CH3O, CH3, Cl and NO2; while, within each homologous series, the number of carbon atoms, n, was…
The effects of the fabrication process on the current–voltage ( I – V ) characteristics of carbon nanotube field effect transistors (CNT-FETs) were studied in detail. A large hysteresis observed in the I – V characteristics of the CNT-FETs having no passivation film became small by passivating the device surface with…
The coadsorption of molecular nitrogen and oxygen on small cationic silver clusters in the gas phase is experimentally studied. The presence of oxygen enhances the adsorption probabilities of N2. This indicates a partial charge transfer out of the finite free electron reservoir of the small silver particles into the c…
We present sidewall functionalization of carbon nanotubes via various dissolving metal reduction methods. Carbanion complexes of lithium were prepared in liquid ammonia and THF and reacted with a series of alkyl and aryl halogenides, as well as methanol resulting in the formations of alkylated, arylated, and hydrogena…
Abstract Tiny green crystals from Kabwe, Zambia, associated with hopeite and tarbuttite (and probably first recorded in 1908 but never adequately characterized because of their scarcity) have been studied by X-ray diffraction, microchemical and electron probe microanalysis, infrared spectroscopy, and synthesis experim…
A window-type environmental cell that can be used over the temperature range from room temperature to approximately 1000 K was improved by incorporating a new window material that increases resolution and contrast in high voltage electron microscopy. With this improvement, the resolution was a few nanometers and the m…
When Pb(Mg 1/2 Nb 2/3 )O 3 –35PbTiO 3 (mol%) (PMN–35PT) is sintered at 1200°C after packing in PbZrO 3 powder, the grains show normal growth with time invariant normalized grain size distributions. If 0.5 wt% MgO is added to PMN–35PT, abnormal grain growth occurs with the large abnormal grains developing nearly cubic…
Ti‐6Al‐4V alloy has attracted increasing applications as a metallic biomaterial in recent years thanks to its good corrosion resistance and biocompatibility. However, the poor corrosion‐wear resistance of the alloy is thus a major concern to potential users. In this paper, the electrochemical noise technique is used a…
The iron sulfate FeOHSO 4 studied was obtained as a dehydration product of metahohmannite Fe 2 (H 2 O) 4 [O(SO 4 ) 2 ] during a synchrotron real-time powder diffraction experiment. As quoted in the literature, FeOHSO 4 has iron atoms octahedrally coordinated with two hydroxyl groups and four sulfate O atoms, while eac…
Abstract Two guanidinate‐based terbium complexes [ i PrNC(N i Pr 2 )N i Pr] m TbCl 3– m [ m = 3 ( 1 ), 2 ( 2 )] were synthesized, and the crystal structure of 1 was determined by single‐crystal X‐ray diffraction. Complexes 1 and 2 were further characterized by elemental analysis, IR, and 1 H NMR spectroscopy. In compl…
The actual fabrication processes of targets for the transmutation of actinides in nuclear reactors will need to be dust‐free and compatible with automation and remote operation. The developments reported here mark an important technical breakthrough in the fabrication of highly active materials. The sol–gel external g…
Abstract A series of azobenzene derivatives containing glycine, l-alanine, l-valine, l-leucine, and l-isoleucine were synthesized and their gelation properties were examined. Although the azobenzene derivatives containing glycine, l-alanine, and l-leucine exhibited very low gelation abilities, other compounds of l-iso…
A common problem in synthetic organic chemistry is attaining proper contact between lipophilic organic compounds and inorganic salts. Various strategies, for example, phase transfer catalysis (Starks, C. M.; Liotta, C. L.; Halpern, M. Phase Transfer Catalysis: Fundamentals, Applications and Industrial Perspectives; Ch…
The clay minerals in Podzols and podzolic soils developed under coniferous forests in the Subarctic and Cool-temperate zones are characterized by the predominance of smectite and/or mica-smectite interstratified minerals in the eluvial horizons and chlorite-vermiculite intergrade in the illuvial horizons. A large amou…
This work reports the effect of pH on the process of mullite formation from mixtures of alumina and silica sols. The pH of the mixtures determines the charges of particle surfaces and affects their interactions and distributions. Mullite formation from amorphous precursors with an Al:Si molar ratio of 1:3, prepared fr…
Analysis of polarization curves and impedance spectra has shown that the surface chemistry of galvanized steels plays an important role in determining their corrosion behavior. Zn-Ni samples that were untreated or had been treated in a 10 mM Ce(NO3)3 solution had the lowest corrosion rates in 0.5 N NaCl. The efficienc…
Halloysite template has a tubular microstructure; its wall has a multi-layer aluminosilicate structure. A new catalytic method is adopted here, through the in-situ reduction of Pd ions on the surface of tubular halloysite by methanol to initiate electroless plating; the detailed deposition features of Pd nanoparticles…
A novel polymer thin film embedded carbon nanotube (PECNT) sensor was developed for ultra-low-power micro thermal sensing. The basic fabrication process of this sensor includes AC electrophoretic manipulation of multi-walled carbon nanotubes (MWNT) bundles on a silicon substrate and embedding them inside parylene C la…