Materials Literature
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We have successfully grown epitaxial GaSe films on GaAs(111), (001) and (112) by molecular beam epitaxy. On the GaAs(111) substrate, the c -axis of the GaSe layer was perpendicular to the substrate surface, while each unit layer of GaSe was inclined on GaAs(001) and (112) substrates when the growth temperatures were h…
Abstract A conductometric glucose sensor was fabricated by coating a twin-microband electrode with a bilayer of a membrane composed of polyaniline and glucose oxidase/gluconolactonase films. The enzyme-catalyzed hydrolysis of glucose induces a change in the conductivity of the pH-sensitive polyaniline film. The conduc…
The elevated‐temperature mechanical behavior of two low‐density fibrous ceramic thermal insulators is discussed. Fracture toughness and R ‐curve behavior are obtained from chevron notched bend bar and short double cantilever beam specimens, respectively. The fracture behavior is related to the bulk microstructures, th…
Abstract The Raman spectra of solutions of poly( N ‐vinyl‐2‐pyrrolidone) (PVP; M̄ w = 1 000, 10 000, 40 000 and 360 000) in D 2 O and dimethyl sulfoxide (DMSO) were measured at various concentrations. PVP is hydrated by D 2 O in a manner different from N ‐ethyl‐2‐pyrrolidone (NEP) and N ‐methyl‐2‐pyrrolidone (NMP), mo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRate Constant and Activation Energy Measurement for the Reaction of Atomic Hydrogen with Methanol, Iodomethane, Iodoethane, and 1-Iodopropane in Aqueous SolutionStephen P. Mezyk and David M. BartelsCite this: J. Phys. Chem. 1994, 98, 41, 10578–10583Publication Date (Print):O…
Synthetic single-crystals of zircon [(100) growth surfaces] were implanted at 77K with 540 keV Pb ions with fluences of 3.3 × 1011 to 5 × 1015 ions/cm2 —a dose range that completely spans the crystalline-to-amorphous transition as determined by Rutherford backscattering/ion-channeling measurements. A chemically unzone…
Abstract The melting behaviour and the morphology of poly(ethylene terephthalate) crystallized from the melt are reported. In general, dual or triple melting endotherms are seen, and single endotherms are seen when the samples are crystallized above 215°C for long times. The location of the uppermost endotherm was fou…
High resolution x-ray photoelectron spectra (XPS) are reported for poly(ethylene terephthalate) (PET) in the form of biaxially oriented crystalline film and amorphous polymer melt (i.e., molten inside the spectrometer during analysis). A small(∼0.14 eV) but unambiguous shift of the C 1s glycol component, relative to t…
Pilot-scale tests were conducted to develop a combined nitrogen oxide (NOx) reduction technology using both selective catalytic reduction (SCR) and selective noncatalytic reduction (SNCR). A commercially available vanadium- and titanium-based composite honeycomb catalyst and enhanced urea (NH2CONH2) were used with a n…
Electrochromic niobium oxide thin films were prepared by chemical vapor deposition. The source material was niobium(V) ethoxide. Amorphous niobium oxide thin films were obtained at a substrate temperature 350°C. Reduction and oxidation of the films in a buffer solution resulted in desirable changes in optical absorpti…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular Design and Langmuir-Blodgett Film Studies on a Series of New Nonlinear Optical Rare Earth ComplexesHui Li, Chun-hui Huang, Xin-sheng Zhao, Xiao-ming Xie, Ling-ge Xu, and Tian-kai LiCite this: Langmuir 1994, 10, 10, 3794–3796Publication Date (Print):October 1, 1994P…
Electrochemical impedance spectroscopy (EIS) has been found to be a rapid and accurate technique for measuring corrosion rates in the most difficult situations and for yielding information concerning the occurrence of localized corrosion. When used in the absence of potentiostatic control, the technique carries less i…
Substrate channeling is a process by which two sequential enzymes interact to transfer a metabolite (or intermediate) from one enzyme active site to the next without allowing free diffusion of the metabolite. Channeling is thought to play an important role in metabolic regulation and cellular modulation of enzymatic a…
Abstract The smectite-to-illite reaction (illitization) was examined in a dilute suspension of Wyoming bentonite in the presence of oxalate and acetate. Experiments were performed using fluidsampling apparatus at 200°C, 50 MPa, in which progressive changes in both clay mineralogy and fluid composition were monitored.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConformational and Motional Characterization of Isolated Poly(.epsilon.-caprolactone) Chains in Their Inclusion Compound Formed with UreaN. Vasanthan, I. D. Shin, and A. E. TonelliCite this: Macromolecules 1994, 27, 22, 6515–6519Publication Date (Print):October 1, 1994Public…
Abstract Grain-coating chlorite cements commonly occur within sandstones of late Middle and Upper Miocene age deposited in the North Sumatra back-arc basin. Chlorites from the Lower Keutapang Member contain Ca (maximum 0.75 wt% oxide) and show textural evidence for direct precipitation on grains. However, crystals are…
This research involved three main tasks: Kinetic studies of gas evolution and metal complexant decomposition in simulated waste media (SWM); Product identification from metal complexant decomposition in SWM; and Determination of the pathway by which N{sub 2}O, N{sub 2}, and NH{sub 3} are formed in SWM. Results are giv…
The loss of tissue mass in humans has been conventionally treated as an irreversible change. Treatments have emphasized replacement of the missing function by use of a transplant, an autograft, tissue synthesized in vitro or, most commonly, by use of engineering devices based on biomaterials. During the last few years…
The electrical conductivity and Hall effect of Al-Cu-Ru and Al-Cu-Fe quasicrystals have been studied in the temperature range 4.2--300 K. Through measurements on samples annealed at various temperatures we found that ordering of the quasicrystalline phase has a strong influence on electrical properties. The largest te…
A directionally solidified eutectic (DSE) of MnO‐ZrO 2 has been investigated using a variety of electron optical techniques. It is found that considerable MnO goes into ZrO 2 to form a substitutional solid solution. About 14 wt% of MnO is soluble in ZrO 2 close to the eutectic temperature. The solubility of ZrO 2 in M…