Materials Literature
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Abstract A simple and efficient procedure for the preparation of water-soluble chitin was developed by controlled partial N-acetylation of chitosan. Acetylated chitosans with about 50% substitution prepared in a highly swelled state exhibited high water-solubility, and the procedure proved much superior to the convent…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and structural and theoretical characterization of a nickel(0) complex of tribenzocyclyne (TBC) and the preparation of a novel organometallic conductorJoseph D. Ferrara, Auro A. Tanaka, Cristian Fierro, Claire A. Tessier-Youngs, and Wiley J. YoungsCite this: Organo…
The glass formability and magnetic properties of rapidly solidified Co-Zr-B alloys were investigated in the composition range Co/sub 80/Zr/sub x/B/sub 20-x/ (2>
The mechanical denaturation process of silk fibroin is examined by Raman spectroscopy. The fresh silk fibroins from the middle gland of mature silkworms are drawn to various ratios on a tensile tester ( R = l drawn / l initial , where l is length) and their conformations are measured with Raman spectroscopy. Undrawn s…
Emission spectra recorded during thermoluminescence provide a fuller understanding of defect properties. Also, as detailed changes in spectra occur with dose, dose rate and thermal treatments, knowledge of emission spectra will make even simple radiation dosimetry, as well as applications such as archaeological and ge…
Plane strain thermomechanical deformations of a viscoplastic body are studied with the objective of analyzing the localization of deformation into narrow bands of intense straining. Two different loadings, namely, the top and bottom surfaces subjected to a prescribed tangential velocity, and these two surfaces subject…
Corrosion of steel (SIS 1146) by two marine isolates, Serratia marcescens EF190 and a Pseudomonas sp. S9 was investigated by weight loss measurements of metal coupons placed in static batch cultures. Cell suspensions with and without nutrients were compared with cell free extracts of cultures and uninoculated controls…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxamidato complexes. 1. A study of the formation of complexes between copper(II) and H2pmox (H2pmox = N,N'-bis(2-pyridylmethyl)oxamide). Synthesis, crystal structure, and magnetic properties of the alternating-chain compound [Cu2(pmox)(H2pmox)(H2O)2](NO3)2.cntdot.8H2OFrances…
A non‐Arrhenius segregation isotherm is derived which includes the change in the heat of segregation with surface coverage due to impurity—impurity interactions. It is shown that a linear dependence of log ( X s ) on the reciprocal temperature, where X s is the surface atomic ratio, can derive either from a constant h…
A porous glass‐ceramic in the CaO–TiO 2 —P 2 O 5 system has been prepared by crystallization and subsequent chemical leaching of the corresponding glass. By applying a two‐step heat treatment to 45CaO · 25TiO 2 · 30P 2 O 5 glasses containing a few mol% of Na 2 O, volume crystallization results in the formation of dens…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolution and solid state characterization of europium and gadolinium Schiff base complexes and assessment of their potential as contrast agents in magnetic resonance imagingPaul H. Smith, J. R. Brainard, D. E. Morris, G. D. Jarvinen, and R. R. RyanCite this: J. Am. Chem. Soc…
We show that a sufficiently large ac electric field reorients the smectic layers irreversibly in chiral smectic-C liquid crystals. Using uniformly aligned samples, prepared by unidirectional buffing, it is demonstrated that at a given temperature the layers tilt away from the buffing axis, b^, by an angle equal to the…
The hypernetted-chain (HNC) approximation is solved for fluids of dipolar hard ellipsoids and the structural, thermodynamic, and dielectric properties of the isotropic phase are discussed in some detail. Both prolate and oblate particles are considered and the isotropic–nematic transition is investigated using density…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAromatization of hydrocarbons by oxidative dehydrogenation catalyzed by the mixed addenda heteropoly acid H5PMo10V2O40Ronny Neumann and Manfred LisselCite this: J. Org. Chem. 1989, 54, 19, 4607–4610Publication Date (Print):September 1, 1989Publication History Published onlin…
Cu is studied as a candidate for low-resistance VLSI interconnection. Simulation studies show that for effective channel length less than 0.5 mu m, the RC time constant of interconnection is a major part of the total delay. By reducing the resistivity of the interconnect, the operating speed can be increased by more t…
Abstract From the energy band approximation of K RONIG and P ENNEY and T AMM'S model of surface states a contribution of the electrons localized at the surface to the surface tension of a solid has been deduced. The results illustrate the difference between the surface tension and the surface energy in the case of a s…
The following magnetic properties were determined for X 52, X 60, X 70, and X 80 grade linepipe steels: magnetic induction as a function of magnetic field strength in the form of hysteresis loops, coercive force and saturation magnetisation. In addition, the following physical properties were determined: coefficient o…
Abstract A systematic analysis of the IR and Raman spectra of dipotassium tartrate hemihydrate (K 2 C 4 H 4 O 6 · ½H 2 O) in terms of the standard frequency correlations, deuteration shift and typical nature (with respect to intensity and width) of bands due to different modes is reported. The bands due to the interna…
Abstract Holtite, (Si 2.25 Sb 0.75 )B[Al 6 (Al 0.43 Ta 0.27 □ 0.30 )O 15 (O,OH) 2.25 ], is orthorhombic a = 4.6914(5), b = 11.896(2), c = 20.383(4)Å, space group Pnma . Full-matrix least-squares refinement yielded a final R = 0.030, for 1664 reflections with I ⩾ 3σ(I). Its crystal structure is closely related to that…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComment on the thermal decomposition of anisole and the heat of formation of the phenoxy radicalM. H. BackCite this: J. Phys. Chem. 1989, 93, 18, 6880–6881Publication Date (Print):September 1, 1989Publication History Published online1 May 2002Published inissue 1 September 19…