摘要:

The1H-NMR spectra of liquid binary mixtures, acetonitryle (ACN) - water (H2O), were recorded at 298 K and the spectral parameters, ΔΔ(ACN-H2O) were evaluated. The surface tensions (σ12) were measured at 298.15 K. From literature values of density (d12), viscosity (η12), relative permittivities (ϵ12) and measured surface tensions the values of molar volumes (V12) and their deviations from “ideality” were calculated. Further on the temperature coefficients of relative permittivity, α2=(1/ϵ12).[dϵ12/d(1/T)], were evaluated. These structural parameters as functions of concentration suggest the formation of the intermolecular “complexes” of the ACN • 2H2O, ACN • H2O, 2 ACN • 3H2O and 2 ACN • 3 H2O types.

ISSN:0031-9104    

DOI:10.1080/00319109808030588

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

Sound velocities for Binary mixtures of 1,1,1-Trichloroethane (TCE) with methyl ethyl ketone, methyl isobutyl ketone, acetophenone, cyclohexanone, methyl acetate, ethyl acetate,n-propyl acetate andn-butyl acetate were determined at 303.15 K. Isentropic compressibility (Ks) were computed from sound velocity and density data, derived from excess volume. The deviation in isentropic compressibility (Ks) exhibits negative values for mixtures of TCE with methyl ethyl ketone, methyl isobutyl ketone, acetophenone, cyclohexanone ethyl acetate,n-propyl acetate andn-butyl acetate. On the other hand, the quantity is positive over the entire range of composition for the mixtures of TCE with methyl acetate. The results are explained in terms of interactions between unlike molecules. Further, the experimental sound velocity data have been analysed in terms of free length theory (FLT) and collision factor theory (CFT).

ISSN:0031-9104    

DOI:10.1080/00319109808030589

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

Experimental values of density, viscosity and ultrasonic velocity are presented for the binary mixtures of dimethyl sulphoxide (DMSO) with methyl amine (CH3NH2), dimethyl amine ((CH3)2NH) and trimethyl amine ((CH3)3N) at 303.15 K over the entire mole fraction of the mixture components. From these data, excess isentropic compressibility (βES), excess intermolecular free-length (LEf), excess acoustic impedance (ZE), excess viscosity (ηE) and excess volume (VE) have been calculated. These quantities are further fitted to the Redlich-Kister relation to estimate the binary interaction parameters and standard errors. The results are analysed in terms of nature and degree of interaction between the component molecules. The nature of variation of these excess parameters provides information about the type of interaction taking place in these binary systems.

ISSN:0031-9104    

DOI:10.1080/00319109808030590

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

Hagenbach and Couette correction factors (KHandKC), constituents of the excess pressure drop resulting due to the flow of aqueous polymer solutions through a 2 : 1 pipe contraction have been determined. The data obtained in the present work, combined with those reported in the literature have been correlated in terms of the flow behaviour index(n) and the diameter contraction ratio β. WhileKHcould be correlated in terms ofnand β with reasonable accuracy,KCcould be represented with an overall deviation of 18.9% over a data set of 14 points.

ISSN:0031-9104    

DOI:10.1080/00319109808030591

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

Experimental solubilities are reported at 25.0°C for thioxanthen-9-one dissolved in thirty-five different organic nonelectrolyte solvents containing ester-, ether-, hydroxy-, methyl- andt-butyl-functional groups. Results of these measurements are used to test the applications and limitations of expressions derived from Mobile Order theory. For the 26 solvents for which predictions could be made computations show that Mobile Order theory does provide fairly reasonable (although by no means perfect) estimates of the saturation mole fraction solubilities. Average absolute deviation between predicted and observed values iscirca45%. In comparison, the average absolute deviation increases significantly to 420% when ideal solution behavior is assumed.

ISSN:0031-9104    

DOI:10.1080/00319109808030592

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

The total structure factors,S(q), of liquid Ag-In alloys have been derived by X-ray diffraction measurements. The concentration dependence of the first peak position is divided into three groups; on going from Ag to 70 at% Ag, the peak position decreases linearly and it goes to decrease with a more rapid proportion for the concentration range from 70 to 40 at% Ag, and furthermore it becomes nearly constant for the remained concentration range.

ISSN:0031-9104    

DOI:10.1080/00319109808030593

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

This is a scanned image of the original Editorial Board page(s) for this issue.

ISSN:0031-9104    

DOI:10.1080/00319109808030587

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor