Materials Literature
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The last decade has seen a tremendous growth in the research and development activities in the area of ferroelectric liquid crystals. The field was opened up by the work of Meyer in 1974, and has now grown rapidly into one of the major research areas in liquid crystal science. The emphasis of the earlier work was on b…
An overview of an important aspect of SANS research on charged colloidal suspensions is presented. These systems are characterized by pronounced interparticle correlations resulting from a strong and long-range double-layer interaction between macroions (i.e. the charged colloidal particles). Emphasis is laid on the u…
Following a major shortage of 99Mo in the 2009–2010 period, concern grew that the aging reactor production facilities needed to be replaced. Most producers were using highly enriched 235U (HEU) as the target material. The Organisation for Economic Co-...Read More
The Onsager-type theory for nematic ordering described in an earlier paper [J. Chem. Phys. 87, 4932 (1987)] is applied to a liquid-density fluid of hard ellipsoids of revolution, and an accurate calculation that agrees very well with the main features of computer simulations of this system is presented. For larger geo…
Absolute calibration forms a valuable diagnostic tool in small-angle scattering experiments and allows the parameters of a given model to be restricted to the set which reproduces the observed intensity. General methods which are available for absolute scaling of small-angle X-ray scattering (SAXS) data are reviewed a…
Existing experimental techniques for measuring the orientational anchoring strength at a substrate-nematic interface are critically analyzed with a particular emphasis on their macroscopic basis and on the range of applicability and precision. Conceptual basis of the anchoring strength is first clarified by making a d…
The crystal and molecular structure of proteinase K was determined by X-ray diffraction data to 0.15-nm resolution. The enzyme belongs to the subtilisin family with an active-site catalytic triad Asp39--His69--Ser224 but is a representative of a subgroup with a free Cys73 close to and 'below' the active His69. Besides…
Abstract Heterogeneous catalysts are generally assumed to be multiphasic and multicomponent; many of them are, and this is one of the resons why disentangling the factors that govern their mode of action is so difficult. But there is a large class of heterogeneous catalysts where the solid is monophasic and where the…
The vanadium atoms in the title anion form a spherical shell— “bulged” by As2O5 groups —around an enclosed H2O molecule. This was revealed by an X-ray structure analysis of the salt K6[As6V15O42(H2O)]ṁ8 H2O. The compound is very readily formed and crystallizes in the form of very large, brown rhombohedra.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPotential building blocks for molecular ferromagnets: [Mn12O12(O2CPh)16(H2O)4] with a S = 14 ground statePeter D. W. Boyd, Qiaoying. Li, John B. Vincent, Kirsten. Folting, Hsiu Rong. Chang, William E. Streib, John C. Huffman, George. Christou, and David N. HendricksonCite th…
The compounds [1,40 \n-bipyridine]-1,10 \n-diium [CuCl4] (1) and [1,40 \n-bipyridine]-1,10 \n-diium \n[CuBr4] (2) were prepared and their crystal structures and magnetic properties are reported. \nThe compounds are isomorphous and crystallize in the monoclinic space group C2/c. The cation \…
Version 1.1 of MISSYM is now available and the following new features have been added: a HELP facility to guide and caution the user; the input of a distance tolerance for axes and planes, and a separate tolerance for inversion centers and translations; the possibility of flagging atomic positions as `possibly disorde…
The ac field dependence of the polarization and strain responses of three different compositions of doped lead zirconate titanate ceramics were measured for samples in both the poled and the depoled states. The results indicate that a reversible domain wall excitation exists which contributes to the weak-signal respon…
Raman spectra of diamondlike amorphous carbon (a-C) films prepared under atmosphere with various hydrogen gas content have been measured as a function of excitation wavelength. The Raman spectral profiles vary with excitation wavelength depending on electronic absorption spectra associated with π-π* electronic transit…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, characterization, and reactivity of oxomanganese(IV) porphyrin complexesJohn T. Groves and Michael K. SternCite this: J. Am. Chem. Soc. 1988, 110, 26, 8628–8638Publication Date (Print):December 1, 1988Publication History Published online1 May 2002Published inissue…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of isopolymetalate-pillared hydrotalcite via organic-anion-pillared precursorsMark A. DrezdzonCite this: Inorg. Chem. 1988, 27, 25, 4628–4632Publication Date (Print):December 1, 1988Publication History Published online1 May 2002Published inissue 1 December 1988http…
Gypsum is a relatively low-cost building material much abounding in our country. When it is put in contact with steel, it may produce high corrosion rates due to its pH value (close to 7). This work reports the results obtained in studying the corrosion rates of bare and galvanized steel in contact with gypsum and pla…
This part II A presents and discusses only the experimental results obtained employing 21,0 % SO3 in the selenitouse conglomerant-mixture cement P-1 (14,11 % C3A) or P-31 (7,62 % C3A) or PUZ-8 which more gypsum, respectively. These experimental results obtained thus with the parameters Δ L (%), [Δ L (%)/g cement] and…