Materials Literature
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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…
The primary structure of bovine liver UDP-glucose dehydrogenase (UDPGDH), a hexameric, NAD(+)-linked enzyme, has been determined at the protein level. The 52-kDa subunits are composed of 468 amino acid residues, with a free N-terminus and a Ser/Asn microhetergeneity at one position. The sequence shares 29.6% positiona…
The deflection of a substrate caused by an anisotropic stress in a thin film that is deposited on it, is studied theoretically. An exact solution of the elastic equations for the three-dimensional cantilever problem is found. Equations for the deflection caused by anisotropic stresses due to, e.g., magnetostriction an…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOn the State of Miscibility of Isotactic Poly(propylene)/Isotactic Poly(1-butene) Blends: Competitive Liquid-Liquid Demixing and Crystallization ProcessesP. M. Cham, T. H. Lee, and H. MarandCite this: Macromolecules 1994, 27, 15, 4263–4273Publication Date (Print):July 1, 199…
We show that there exists a novel long range interaction in ferroelectric Sm-C* materials due to thermally excited polarization waves. We propose that this interaction is the long range repulsion whose existence had been postulated earlier to explain the long period ferrielectric phases observed near the ferroelectric…
The nature of the interaction of CO with NiO(100) thin films (∼20–50 Å) grown on a Mo(100) substrate has been investigated with infrared reflection absorption spectroscopy. Isosteric heats of adsorption were measured for CO in a pressure range of 1×10−8 to 1 Torr and over a temperature range of 93–280 K. The average h…
Elongated β′‐SiAlON grains grown from several finegrained Y m/3 Si 12(m+n) Al m+n O n N 16–r compositions with α‐Si 3 N 4 , AlN, Al 2 O 3 , and Y 2 O 3 starting materials have been examined. These grains have large aspect ratios and are oriented along the [0001] axis. TEM structural and chemical analysis suggests that…
Conducting‐polymer‐based sensory materials systems are designed to exhibit ionochromic, electrochemical, and/or resistive responses to specific chemical signals. The integration of molecular recognition elements into them is described. Poly(bithiophene) undergoes a twisting of the polymer backbone upon ion complexatio…