Results 321 to 330 of about 813,308 (361)
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Acta Crystallographica Section B Structural Science, 1990
On the basis of test calculations, Kundrot & Richards [Acta Cryst. (1987), B43, 544-547] suggest that for models of protein crystal structures based on limited-resolution X-ray data, it is not appropriate to vary both the occupany (Q) and thermal (B) parameters for the solvent molecules during refinement.
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On the basis of test calculations, Kundrot & Richards [Acta Cryst. (1987), B43, 544-547] suggest that for models of protein crystal structures based on limited-resolution X-ray data, it is not appropriate to vary both the occupany (Q) and thermal (B) parameters for the solvent molecules during refinement.
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Talanta: The International Journal of Pure and Applied Analytical Chemistry, 2020
A simple, green, rapid, and efficient ligandless dispersive liquid-liquid microextraction procedure based on solidification of a ternary deep eutectic solvent has been proposed for the extraction of trace amounts of Cd(II), Cu(II), and Pb(II) ions in ...
S. M. Sorouraddin +2 more
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A simple, green, rapid, and efficient ligandless dispersive liquid-liquid microextraction procedure based on solidification of a ternary deep eutectic solvent has been proposed for the extraction of trace amounts of Cd(II), Cu(II), and Pb(II) ions in ...
S. M. Sorouraddin +2 more
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Journal of Polymer Engineering, 2012
Abstract Sensitivity analysis of free-volume theory parameters have been done in ternary polymer-solvent-solvent systems. Two ternary polymer-solvent-solvent systems have been studied: poly(styrene)-tetrahydrofuran-p-xylene and poly(methyl methacrylate)-ethylbenzene-tetrahydrofuran systems.
Raj Kumar Arya, Madhu Vinjamur
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Abstract Sensitivity analysis of free-volume theory parameters have been done in ternary polymer-solvent-solvent systems. Two ternary polymer-solvent-solvent systems have been studied: poly(styrene)-tetrahydrofuran-p-xylene and poly(methyl methacrylate)-ethylbenzene-tetrahydrofuran systems.
Raj Kumar Arya, Madhu Vinjamur
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Solubility parameters from maxima in solubility/solvent plots
International Journal of Pharmaceutics, 1980Abstract Solubility data of a substance in solvents with known solubility parameters have been used graphically in the past to determine the solubility parameter of the solute. A multiple regression method of handling this is presented. It gives rise to self-consistent solubility parameters, but the solvent molar volumes calculated are anomalous ...
Guy Cavé +4 more
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Empirical Parameters of the Polarity of Solvents
Angewandte Chemie International Edition in English, 1965AbstractThe empirical parameters of the polarity of solvents which have been determined recently are reviewed: Y‐values (Winstein, Grunwald), X‐values (Gielen, Nasielski), Ω‐values (Berson, Hamlet, Mueller), Z‐values (Kosower), ET‐values (Dimroth, Reichardt, Siepmann, Bohlmann), R‐ and S‐values (Brownstein).
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Journal of the Chemical Society, Faraday Transactions, 1990
It is proposed that the ratio µ2/V, from electrostatic solvation theory, be used to designate solvent polarity; µ is the dipole moment and V the molar volume. The 101 solvents analysed can be divided into four classes (and two subclasses) by means of the correlation between the dielectric β parameter (proportional to µ2/V) and the empirical solvent ...
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It is proposed that the ratio µ2/V, from electrostatic solvation theory, be used to designate solvent polarity; µ is the dipole moment and V the molar volume. The 101 solvents analysed can be divided into four classes (and two subclasses) by means of the correlation between the dielectric β parameter (proportional to µ2/V) and the empirical solvent ...
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Two-parameter scaling for polymers in Θ solvents
Macromolecules, 1990We revive an old conjecture that a fixed number of binary contacts between chains collec- tively make up the topological constraint commonly referred to as an entanglement. This leads us to a general scaling theory for semidilute polymer solutions which involves two length scales, the screening length ( and the tube diameter a.
Ralph H. Colby, Michael Rubinstein
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Empirical polarity parameters for some binary solvent mixtures
Australian Journal of Chemistry, 1981Values of the empirical solvent polarity parameters E T and Z have been determined as a function of composition for the binary solvent systems 1,2-dibromoethane + 1,2-dibromopropane, acetone + chloroform, acetone + ethanol, ethanol + chloroform and acetone + dichloromethane.
S Balakrishnan, AJ Easteal
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The g interaction parameter of polymer-solvent systems
Macromolecules, 1986Calcul pour 41 systemes polymere-solvant.
Rosa M. Masegosa +2 more
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Solute-solvent interaction parameters by gas chromatography.
Journal of chromatography. A, 2005Gas-liquid distribution coefficients at ideal dilution in non-volatile solvents can be measured by gas chromatography. The numerical value of a coefficient depends on the choice of the concentration unit in the solvent and in the gas phase. The relationships between different coefficients characterizing gas-liquid equilibria are discussed and ...
Ervin sz, Kováts +2 more
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