Materials Literature
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The possible use of Fourier transform infrared reflection‐absorption spectroscopy (FT‐IRAS) and Raman spectroscopy for surface studies of thin (<10 nm) corrosion products on Cu has been explored. Cu samples were exposed to 75% relative humidity and 25°C in flowing air, with additions of 0.25 ppm of SO 2 and NO 2 . X‐r…
Abstract The efficiency of α, I pair creation at exciton decay is high at 4.2 K for KCl, KBr, and RbBr crystals for which H centers are oriented along 〈110〉. The efficiency of α, I pair creation by VUV‐irradiation at 4.2 K is extremely low for NaCl crystals for which H centers are oriented along 〈111〉. The process of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe use of an electrogenerated cobalt(I) porphyrin for the homogeneous catalytic reduction of dioxygen in dimethylformamide. Reactions of [(TMpyP)CoII]4+ and [(TMpyP)CoI]3+ where TMpyP = meso-tetrakis(1-methylpyridinium-4-yl)porphyrinD. Sazou, C. Araullo-McAdams, B. C. Han,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleEffect of a coalescing aid on polymer diffusion in latex filmsYongcai Wang and Mitchell A. WinnikCite this: Macromolecules 1990, 23, 21, 4731–4732Publication Date (Print):October 1, 1990Publication History Published online1 May 2002Published inissue 1 October 1990https://pubs.ac…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIn situ FTIR and XPS studies of the hexacyanoferrate redox systemMonika. Datta and Arunabha. DattaCite this: J. Phys. Chem. 1990, 94, 21, 8203–8207Publication Date (Print):October 1, 1990Publication History Published online1 May 2002Published inissue 1 October 1990https://pu…
Abstract A thermodynamic framework for the analysis of gas sorption in glassy polymers is established in the limit of low sorption levels. The results represent an extension of the Flory‐Huggins theory to materials with nonzero internal energy changes due to deformation; the Flory‐Huggins theory is recovered in the li…
Linearly polarized laser light is scattered from an oscillating, acoustically levitated bubble, and the scattered intensity is measured with a suitable photodetector. The output photodetector current is converted into a voltage and digitized. For spherical bubbles, the scattered intensity I(rel)(R,theta,t) as a functi…
The dramatic proliferation of products based on semiconductor technology is a strong testament to the predictability and reliability of solid-state technology. In a similar vein, advances in materials exhibiting high levels of ionic conduction in the solid state has led to worldwide efforts in the development of all-s…
CenA from Cellulomonas fimi is a beta-1,4-endoglucanase that binds tightly to cellulose. X-ray-scattering analyses show that the enzyme is tadpole-shaped: the previously identified catalytic and cellulose-binding domains comprise the head and tail respectively. It appears that this structural and functional organizati…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSimple design of monolith reactor for selective catalytic reduction of nitric oxide for power plant emission controlMarek A. Buzanowski and Ralph T. YangCite this: Ind. Eng. Chem. Res. 1990, 29, 10, 2074–2078Publication Date (Print):October 1, 1990Publication History Publish…
We report two new applications of the Raman heterodyne detection technique. Raman heterodyne detected electron-nuclear double resonance and a double rf resonance technique are used to obtain the hyperfine structure of the nitrogen-vacancy center in diamond.
In this paper, we study the thermodynamic properties of dense plasmas considered as high-temperature liquid metals. The problems that have to be solved are the following: (1) calculation of the ``average'' electron-density profile around an ion in the plasma, (2) determination of a self-consistent average ionization o…
Abstract A soluble aromatic poly (amic acid) film was converted to a soluble polyimide by staging at 25°C intervals to 325°C and characterized at each interval by several analytical methods. The behavior observed was consistent with an interpretation that a reduction occurred in molecular weight of the poly (amic acid…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTViscoeleastic properties of solutions of star-branched polystyreneKunihiro Osaki, Eiichi Takatori, Michio Kurata, Hiroshi Watanabe, Hirotsugu Yoshida, and Tadao KotakaCite this: Macromolecules 1990, 23, 20, 4392–4396Publication Date (Print):October 1, 1990Publication History…
A Brookfield RVTD mixer viscometer was used to gelatinize 5.5, 6.4, and 7.3% (d.b.) native corn starch solutions, and a 6% bean starch solution. Torque, the dependent variable, was used to estimate parameters in a generalized viscosity model. The independent variables were impeller speed, temperature (50–95°C), concen…
Impact ionization rates for electrons and holes in (100) A10.48In0.52As were determined from photo multiplication measurements using AIInAs / FaInAsp +-i-ndiodes grown by metal-organic vapor phase epitaxy (MOVPE). The impact ionization rate ratio (prop; / beta;) was derived as being 2.0 ~ 3.5 over the electric field r…
Alloy sheets of Ni–49·2at% Ti were cold rolled at room temperature. The microstructure of a 60% reduced sample showed the formation of amorphous bands within the finely twinned crystalline matrix. Sample fracture was observed for reductions of more than 65%. The fracture surface extended straight and inclined 30° to 5…
Abstract Thermoluminescence spectra have been recorded for crystals of pure KMgF3, KMgF3:Pb2+ and KMgF3:Eu3+, with the aim of identifying new phosphors for radiation dosimetry. Glow peaks, due to thermal activation of colour centres formed by ß or ? irradiation, were measured in both pure and doped materials. Typical…
The domain structure self-assembled under a steady Couette flow was investigated on a semidilute solution of polymer mixture (polymer A + polymer B + solvent) at a composition near the critical one by use of the in situ light scattering method. This method permits a quantitative analysis of the scattering profile I(qy…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTriangulanes: stereoisomerism and general method of synthesisN. S. Zefirov, S. I. Kozhushkov, T. S. Kuznetsova, O. V. Kokoreva, K. A. Lukin, B. I. Ugrak, and S. S. TratchCite this: J. Am. Chem. Soc. 1990, 112, 21, 7702–7707Publication Date (Print):October 1, 1990Publication…