Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
We present the phase diagram of a system of hard spherocylinders, including the isotropic liquid and the nematic and smectic-A liquid crystals, calculated with a nonlocal-density-functional model for the free energy. We get first- and second-order nematic--smectic-A transitions, with a tricritical point at L/D=50, and…
The reaction of [(cyclo-C6H11)7Si7O9(OSiMe3)(OH)2] with CrO3 leads to the formation of [(cyclo-C6H11)7Si7O11(OSiMe3)CrO2], a new crystallographically characterized silyl-chromate complex that catalyses the polymerization of ethylene in the presence of trialkylaluminium reagents.
Abstract A new method omitting oxygen removal procedures from polymerization mixtures was developed for graft polymerization of acrylamide (AAm) onto the surface of poly(ethylene terephthalate) (PET) film with the simultaneous UV irradiation method without photo‐sensitizer. UV irradiation of the PET film with a high p…
[NMe4][CuPt(CN)4] contains an infinite 3D [CuIPtII(CN)4]nn– framework related to the PtS structure, which generates two mutually perpendicular and equivalent sets of hexagonal channels of large cross-section (largest Pt ⋯ Pt diagonal, 13.50 Å) together with large empty square channels perpendicular to the hexagonal ch…
The analytical theory of the conformations of end-grafted polymer ‘brushes’ is compared to direct numerical solutions of the mean-field equations developed by Scheutjens and Fleer. For moderately large chain length N, the predicted distribution of chain free ends and parabolic monomer density profile are confirmed in…
The Fourier transform technique developed for the design of variable refractive index coatings such as rugate filters is improved to achieve an accurate correspondence between optical properties and the refractive index profile. An application to the design of narrowband reflectors is presented.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA study of solution polymerization of polyphosphazenesAshutosh N. Mujumdar, Scott G. Young, Robert L. Merker, and Joseph H. MagillCite this: Macromolecules 1990, 23, 1, 14–21Publication Date (Print):January 1, 1990Publication History Published online1 May 2002Published iniss…
\n Contains fulltext :\n 10103.pdf (Publisher’s version ) (Open Access)\n
The surface oxidation of a wood-based activated carbon by heat treatment in oxygen and carbon dioxide has been studied by diffuse reflectance Fourier transform infrared spectroscopy and compared with the results of aqueous oxidation by hydrogen peroxide and nitric acid. Untreated carbon gave infrared bands due to CO,…
Abstract Two types of hetero–metal assemblies {NBu4CuCr(ox)3]}x (1) and {[{Cu(bpy)}2Cr(ox)3]NO3}x (2)(NBu4 = tetrabutylammonium ion, ox = oxalate ion, bpy = 2,2′-bipyridine, x = infinite number) have been synthesized and their cryomagnetic properties (4.2–300 K) have been examined. The compound 1 has an oxalate-bridge…
The first product formed upon interaction of CO with the surface of fully dehydroxylated MgO is CO2–2. This species is generated by nucleophilic attack of a surface O2– on CO weakly σ-bonded on an Mg2+ cation in an adjacent position. The CO2–2 species generates C3O2–4 by addition of 2 CO molecules. Trimeric species (a…
Cuttings of 6-week-old Norway spruce (Picea abies (L.) Karst.) seedlings were placed in liquid media containing various concentrations of Ca2+. Cytoplasmic concentrations of Ca2+ were manipulated using the ionophore A 23 187. The effects of Ca2+ concentrations on the deposition of total cell wall material as well as o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDisilene complexes of molybdenum and tungstenDonald H. Berry, Jean H. Chey, Howard S. Zipin, and Patrick J. CarrollCite this: J. Am. Chem. Soc. 1990, 112, 1, 452–453Publication Date (Print):January 1, 1990Publication History Published online1 May 2002Published inissue 1 Janu…
Abstract The present study reports results on the processing and mechanical properties of composites modified by the addition of dicumyl peroxide (DCP). The addition of minute amounts of peroxide to the cellulose/polymer system during processing has been shown to significantly improve the physical properties of compos…
A thermostable, acid proteolytic activity has been found to be associated with the cells and in the culture medium of Sulfolobus acidocaldarius, an archaebacterium. This acid protease, which has been named thermopsin, was purified to homogeneity from the culture medium by a five-step procedure including column chromat…
In this paper we present the characterization by UV-VIS, Mössbauer, and EPR spectroscopy of [L2Fe2(μ-OH)3](ClO4)2⋅2CH3OH⋅2H2O, with L=N,N′,N″-trimethyl-1,4,7-triazacyclononane, a novel dimeric iron compound, which is shown to possess a central exchange-coupled delocalized-valence Fe(II/III) pair. Complete delocalizati…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDynamics of copolymer and homopolymer mixtures in bulk and in solution via the random phase approximationA. Ziya Akcasu and M. TombakogluCite this: Macromolecules 1990, 23, 2, 607–612Publication Date (Print):January 1, 1990Publication History Published online1 May 2002Publis…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUtility of the semiempirical INDO/1 method for the calculation of the geometries of second-row transition-metal speciesWayne P. Anderson, Thomas R. Cundari, Russell S. Drago, and Michael C. ZernerCite this: Inorg. Chem. 1990, 29, 1, 1–3Publication Date (Print):January 1, 199…
Description Material for future reactors is the focus of this new publication from ASTM. Eighteen papers anticipate safety and waste disposal problems from induced radioactivity in the reactor materials. Papers presented in three sections: • Austenitic Stainless Steels • Ferritic Steels • Vanadium Alloys
Advanced Processing Concepts for Increased Ceramic Reliability Processing of Silicon Nitride Powders Wet Forming Processes as a Potential Solution to Agglomeration Problems Processing of Electronic Ceramics Processing of Ceramic Composites Injection Moulding of Fine Ceramics Electrophoretic Deposition as a Processing…