Materials Literature
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The authors describe how accurate estimates of low levels of insulator contamination, in the range of 200 mg/m/sup 2/ (0.02 mg/cm/sup 2/), can only be obtained if several minor errors in conventional surface contamination measurements are corrected.>
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural Effects on the Transport of Water in PolyimidesJohn G. Van Alsten and John C. CoburnCite this: Macromolecules 1994, 27, 14, 3746–3752Publication Date (Print):July 1, 1994Publication History Published online1 May 2002Published inissue 1 July 1994https://pubs.acs.or…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTnitroxide Complexes of Diruthenium(II,II) Carboxylates. Structural and Magnetic PropertiesAndre Cogne, Elie Belorizky, Jean Laugier, and Paul ReyCite this: Inorg. Chem. 1994, 33, 15, 3364–3369Publication Date (Print):July 1, 1994Publication History Published online1 May 2002…
Intense luminescence whose wavelength is ca. 435 nm is observed under the excitation of 680 nm in phosphors irradiated by x‐rays. From ESR measurements, typical F‐centers are created in the phosphors on x‐ray exposure. These results clearly indicate photostimulated luminescence (PSL) occurring in these phosphors. The…
The adult cuticular wing of Drosophila is covered with an array of distally pointing hairs. Mutations in the inturned (in) gene result in both abnormal hair polarity (i.e., hairs no longer point distally), and, in most cells forming more than one hair. We have isolated and characterized a collection of in alleles. Amo…
In the spinel compounds of ACr2 X 4 type, and in the spinel series of Zn1−xGa2x/3Cr2Se4, ZnCr2-xInxSe4, Zn1−xCuxCr2Se4 and Li1+xTi2-x,O4, the influence of vacancies and mixed valence on the transport processes is considered. For this purpose, a procedure of calculation of the ion packing coefficients was used and calc…
Abstract The synthesis and characterization of a novel liquid crystalline difunctional epoxy compound, 6,6′‐bis(2,3‐epoxypropoxy)‐2,2′‐binaphthyl ( 4 ), is presented. This epoxide, obtained by glycidyl termination of 2,2′‐binaphthyl‐6,6′‐diol, shows a nematic phase between 240 and 270°C. The curing reaction was carrie…
Abstract The chemical bonding of titanium in MFI‐type zeolites (Ti‐silicalite) has been investigated using x‐ray photoelectron spectroscopy (XPS). Different titanium silicalites as well as pure titania (anatase) have been analysed. We have found a distinctively higher binding energy of the Ti 2p photoelectrons in Ti‐s…
Abstract PET (Polyethylene terephthalate) films were modified with two different plasmas, nitrogen and oxygen, as a function of treatment times and RF powers. Firstly, the chemical composition of the plasma‐modified PET films was investigated by XPS. In the case of nitrogen plasma, the formation of amine, imine and am…
A novel strategy is presented for the crystallization of membrane proteins or other proteins with low solubility and/or stability. The method is illustrated with the lactose permease from Escherichia coli, in which a fusion is constructed between the permease and a 'carrier' protein. The carrier is a soluble, stable p…
The reaction of 3 equiv of KOC(CF_3)_2Me with ReOCl_3(PPh_3)_2 in dichloromethane, followed by recrystallization from hexanes/THF, gives ReO[OC(CF_3)_2Me]_3(THF)_2( 1) in 35 7% yield. An \nX-ray diffraction study of 1 (monoclinic, P2_1/n, a = 10.010(3) Å, b = 29.247(6) Å, c = 10.800(3) Å, β = 117.09(1)', Z = 4) re…
A sheet-conductor fabrication method has been developed for Cu-Ag alloys containing 6-24 mass% Ag. Both the strength and the conductivity of the sheet were improved remarkably by the repetition of heat treatment combined with cold working. The intermediate heat treatments were repeated 3 times at 400-450/spl deg/C for…
A detailed investigation using X‐ray diffraction and other supportive techniques was performed on a preceramic polysilazane to study its pyrolytic conversion to silicon nitride (Si 3 N 4 ). Analytical techniques were developed to determine the volumetric degree of crystallinity with respect to pyrolysis temperature. Q…
Electrochemical polymerization without a supporting electrolyte would most probably yield a material with more reproducible and better difined propertis, and is therefore a technique to be encouraged. The formation of an electroactive, self‐doped polymer (see Figure) by electropolymerization is described and the analy…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface Tensions and Relative Adsorptions in Hydrogen-Bonded SystemsDimitrios Papaioannou and Constantinos G. PanayiotouCite this: J. Chem. Eng. Data 1994, 39, 3, 457–462Publication Date (Print):July 1, 1994Publication History Published online1 May 2002Published inissue 1 Ju…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn Interpretation of the Structure of the Inclusion Complexes [RCN.cntnd.(V12O32)4-] (R = CH3, C6H5) from Electrostatic PotentialsMarie-Madeleine Rohmer and Marc BenardCite this: J. Am. Chem. Soc. 1994, 116, 15, 6959–6960Publication Date (Print):July 1, 1994Publication Histo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew Mono- and Trispirocyclotriphosphazenes from the Reactions of (NPCl2)3 with Aromatic Ortho DinucleophilesHarry R. Allcock, Ursula Diefenbach, and Shawn R. PucherCite this: Inorg. Chem. 1994, 33, 14, 3091–3095Publication Date (Print):July 1, 1994Publication History Publish…
Platinum on γ-Al2O3 represents one of the technically important supported catalysts. In order to model such a system, we have prepared a well-ordered 5-Å-thick and atomically flat oxide film with γ-alumina-like structure on NiAl(110). Its defect structure has been subject to a spot-profile analysis–low-energy electron…
Hydrostatic pressure-induced morphological and physiochemical changes in monomeric myosin were investigated. The turbidity of a myosin solution increased after release of pressure, indicating aggregation of the molecules. Some molecules were single headed after exposure to 100-200 MPa, in contrast with an intact molec…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUtility of N-Methylimidazole in Isolating Crystalline Lanthanide Iodide and Hydroxide Complexes: Crystallographic Characterization of Octasolvated [Sm(N-MeIm)8]I3 and Polymetallic [SmI(.mu.-I)(N-MeIm)3]2, [(N-MeIm)5Sm(.mu.-OH)]2I4, and {[(N-MeIm)4Sm(.mu.-OH)]3(.mu.3-OH)2}I4W…