Materials Literature
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Heat-capacity measurements by adiabatic equilibrium calorimetry are reported for γ-phase Pr2S3, Tb2S3, and Dy2S3 between 5 and 350 K. Highly purified samples were prepared and their composition verified by chemical analysis. Precision lattice parameters were determined for each compound and are compared with literatur…
Under shear, nematic liquid crystals can exhibit localized excitations that propagate much faster than simple one-dimensional analysis can predict. We describe a two-dimensional theory in which the excitations are fronts between distinct solutions of the steady-state Ericksen-Leslie equations. We find that a front's s…
The change in energy related to the dissociation of a 1/2 〈1l0〉 screw dislocation into two Shockley partials or of an edge dislocation into the Lomer-Cottrell configuration has been recalculated. It is shown that the exact value, and even the sign, of this change cannot be found using linear isotropic elasticity when…
Abstract The adsorption of citrate, at 10 4 −10 −3 M initial concentration, by pseudoboehmite suspended in 0.02 M NaC1O 4 was investigated at varying pH. Citrate shows a strong affinity for the pseudoboehmite surface, as seen in the adsorption isotherm at pH 6. Adsorption envelopes of adsorbed citrate vs. pH for a giv…
Irradiation by red light at T ≲ 40 K induces the transition of the stable high‐spin state of 1 to a metastable low‐spin state, which, at T < 40 K, has a lifetime of days to weeks, The transition occurs via double intersystem crossing, 5 T 2 → 5 E → 3 T 1 → 1 A 1 . Compound 1 is only the second compound to show this…
Abstract A series of works with the aim of clarifying the mechanisms of thermal and photochemical degradation of PVC are reviewed. They include studies on: i) degradation of PVC samples of various tacticities; ii) degradation of PVC after modification by stereoselective nucleophilic substitution; iii) influence of tem…
The electronic-energy-straggling values for 50--250-keV ${\mathrm{H}}^{+}$ beams penetrating Cu, Ag, and Pt have been measured using backscattering. The Cu, Ag, and Pt layers with a thickness of about 30 nm were deposited onto Si, ${\mathrm{SiO}}_{2}$, ${\mathrm{Al}}_{2}$${\mathrm{O}}_{3}$, and ${\mathrm{ZrO}}_{2}$ su…
Abstract New measurements of the heat capacity in the melt of poly(trimethylene succinate) (PTMS), poly(trimethylene adipate) (PTMA), and poly(hexamethylene sebacate) (PHMS) from 310 to 400 K are presented. Based on these data and literature data on eight other molten polylactones and poly(ethylene sebacate) (PES), an…
Abstract Changes in the fine structure of cellulose samples of different origin during treatment with sodium hydroxide in ethanol/water mixtures were studied. A computer program was written for peak separation and profile analysis. The presence of an amorphous phase was taken into account by adding a Gaussian type fun…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTShort synthesis of (.+-.)-5-(3-furyl)octahydro-8-methylindolizines, alkaloids related to a component of Castoreum. Use of radical cyclizationDerrick L. J. Clive and Raymond J. BergstraCite this: J. Org. Chem. 1991, 56, 16, 4976–4977Publication Date (Print):August 1, 1991Publ…
Abstract Tenside sind wegen ihrer vielseitigen Einsatzmöglichkeiten ein unverzichtbarer Bestandteil unseres Lebens. Sie dienen nicht nur zum Waschen und Reinigen, sondern auch zur Herstellung von Textilien, kosmetischen Produkten, Nahrungsmitteln, Kunststoffprodukten, Lacken und Farben. Weniger bekannt ist ihr Einsatz…
Abstract There is still controversy over the relative efficiency and stabilization mechanisms of secondary and tertiary HALS. In this study the performance of secondary HALS is compared with that of corresponding hindered amines bearing various substitutents at the sterically hindered nitrogen atom. The bulk of the st…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDielectric relaxation of liquid crystalline cyanoethylated O-(2,3-dihydroxypropyl)celluloseTakaya Sato, Yoshinobu Tsujii, Yasuo Kita, Takeshi Fukuda, and Takeaki MiyamotoCite this: Macromolecules 1991, 24, 16, 4691–4697Publication Date (Print):August 1, 1991Publication Histo…
Abstract The electrochemical behaviour of a sintered stainless steel and of a wrought AISI type stainless steel of the same composition were compared. The electrochemical measurements used were the evolution of the corrosion potential vs time, the anodic and cathodic polarizations and the current‐time transients. Comp…
The purpose of this article is to examine information regarding the antibacterial characteristics of silver when used in drinking water treatment, available data on bacterial populations in effluents from silver‐impregnated filter units, regulatory and test programs relating to the bacteriostatic action of silver in f…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTField-stimulated electron promotion from core 4f-orbital to out-of-core .sigma.6s orbital phenomenon in simple lanthanide compoundsI. GotkisCite this: J. Phys. Chem. 1991, 95, 16, 6086–6095Publication Date (Print):August 1, 1991Publication History Published online1 May 2002P…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPentacoordinated molecules. 87. Isolation of the first anionic five-coordinated silicates with six- and seven-membered oxygen-containing ringsK. C. Kumara Swamy, Channareddy Sreelatha, Roberta O. Day, Joan Holmes, and Robert R. HolmesCite this: Inorg. Chem. 1991, 30, 16, 312…
Abstract Melt crystallization manufacturing systems are characterized mathematically and optimized. Directional solidification and sweating are modeled, and the results are correlated to plant data. A nonlinear programming algorithm is constructed to determine the optimal design and operation of a production plant. Pr…
The interaction of the La (III) and Tb (III) ions with adenosine-5'-monophosphate (5'-AMP), guanosine-5'-monophosphate (5'-GMP), and 2'-deoxyguanosine-5'-monophosphate (5'-dGMP) anions with metal/nucleotide ratios of 1 and 2 has been studied in aqueous solution in acidic and neutral pHs. The solid complexes were isola…
This article summarizes our ultrastructural studies on the organization of the thylakoid membrane of green algae and higher plants. We have used freeze-fracture and immunogold labeling to investigate the lateral distribution of the components in the membrane, their interactions, and the folding of their polypeptide ch…