Rotational Diffusion of Nonpolar and Ionic Solutes in 1-Alkyl-3-methylimidazolium Tetrafluoroborate–LiBF4 Mixtures: Does the Electrolyte Induce the Structure-Making or Structure-Breaking Effect?

2015 ◽  
Vol 119 (48) ◽  
pp. 15040-15045 ◽  
Author(s):  
Sugosh R. Prabhu ◽  
G. B. Dutt
Keyword(s):  
Rotational Diffusion ◽  
Breaking Effect ◽  
Ionic Solutes ◽  
Structure Breaking

Diffusive motions of water molecules near 1 °C

1978 ◽  
Vol 56 (3) ◽  
pp. 373-380 ◽  
Author(s):  
J. D. Irish ◽  
W. G. Graham ◽  
P. A. Egelstaff
Keyword(s):  
Atmospheric Pressure ◽  
Rotational Diffusion ◽  
Waller Factor ◽  
Root Mean Square Amplitude ◽  
Breaking Effect ◽  
Debye Waller Factor ◽  
Effects Of Temperature ◽  
Temperature And Pressure ◽  
Breaking Time ◽  
Structure Breaking

Neutron (quasi-elastic) scattering experiments have been carried out to investigate the effects of temperature and pressure on the motion of molecules in liquid H2O. Spectra were obtained at several temperatures between −10 and +24 °C at atmospheric pressure, and also at +1 °Cand 1.42 × 108 Pa. The root-mean-square amplitude of proton motion in solid and liquid H2O at atmospheric pressure has been inferred from measurements of the Debye–Waller factor and is nearly constant at 0.07 nm for both the solid and liquid. A model in which the translational diffusion and rotational diffusion are based on Brownian motion was fitted to our data using published diffusion coefficient data. The structure breaking time was found to be very small at 1 and 10 °C. Both these conclusions are compared with those reported in several earlier papers, which gave varying results.The spectrum measured at 1.42 × 108 Pa was slightly broader than the corresponding spectrum at atmospheric pressure, probably indicating that the well-known minimum in the viscosity at this pressure is due to a structure breaking effect.

“Structure Breaking” Effect of Hydrated Cs+

2004 ◽  
Vol 108 (9) ◽  
pp. 1509-1514 ◽  
Author(s):  
Christian F. Schwenk ◽  
Thomas S. Hofer ◽  
Bernd M. Rode
Keyword(s):  
Breaking Effect ◽  
Structure Breaking

Excess Volumes of Binary Mixtures of Alcohols in Methylcyclohexane

1974 ◽  
Vol 52 (5) ◽  
pp. 788-790 ◽  
Author(s):  
Murari Venkata Prabhakara Rao ◽  
P. Ramachandra Naidu
Keyword(s):  
Binary Mixtures ◽  
Entire Range ◽  
Excess Volumes ◽  
Breaking Effect ◽  
Structure Breaking

Excess volumes of binary mixtures of alcohols in methylcyclohexane have been determined at 30.0 and 40.0 °C, using a modified dilatometer of Brown and Smith. The systems include: (I) 1-propanol – methylcyclohexane, (2) 1-butanol – methylcyclohexane, (3) 1-pentanol–methylcyclohexane, and (4) 1-hexanol–methylcyclohexane. The VE values are found to be positive over the entire range of composition in all the four systems and the values are interpreted on the basis of the structure-breaking effect of methylcyclohexane.

Apparent Molal Volumes and Heat Capacities of Urea and Methyl-Substituted Ureas in H2O and D2O at 25 °C

1974 ◽  
Vol 52 (9) ◽  
pp. 1709-1713 ◽  
Author(s):  
Patrick R. Philip ◽  
Gérald Perron ◽  
Jacques E. Desnoyers
Keyword(s):  
Heat Capacity ◽  
Hydrogen Bonding ◽  
Heat Capacities ◽  
Breaking Effect ◽  
Methyl Substitution ◽  
Apparent Molal Volumes ◽  
Hydrogen Bonding Interactions ◽  
Molal Volumes ◽  
Methylene Group ◽  
Structure Breaking

The apparent molal volumes and heat capacities of urea, 1,1- and 1,3-dimethylurea, and tetramethylurea were measured in H2O and D2O at 25 °C. From these data, urea–water interactions seem to cause an overall structure-breaking effect and the substituted ureas, an overall structure-making effect. The effect of the hydrogen-bonding interactions to the volume and heat capacity seems to be small compared with the intrinsic and hydrophobic contributions of a methylene group, as reflected by the isotope effect. Furthermore, transfer values seem to show a significant specificity to the degree and position of methyl substitution.

Isentropic Compressibilities of Butylamine+n-Alkane at 303.15 and 313.15 K

1979 ◽  
Vol 32 (3) ◽  
pp. 471 ◽  
Author(s):  
M Sreenivasulu ◽  
PR Naidu
Keyword(s):  
Chain Length ◽  
Binary Mixtures ◽  
Breaking Effect ◽  
Isentropic Compressibilities ◽  
Structure Breaking

Isentropic compressibilities of binary mixtures of butylamine + hexane, butylamine + heptane, and butylamine + octane were determined at 303.15 and 313.15 K. The three mixtures exhibit positive deviations in compressibility. This is ascribed to a structure-breaking effect of n-alkanes. The deviation becomes more positive with increase in chain length of n-alkanes and with increase in temperature.

Dielectric Spectroscopy of Binary Liquid Mixtures of Methanol with Morpholine, Pyrrolidine and some of their Derivatives

1997 ◽  
Vol 52 (8-9) ◽  
pp. 675-677
Author(s):  
V. K. Syal ◽  
U. Becker ◽  
R. Elsebrock ◽  
M. Stockhausen
Keyword(s):  
Dielectric Spectroscopy ◽  
Composition Dependence ◽  
Liquid Mixtures ◽  
Binary Liquid Mixtures ◽  
The Other ◽  
Breaking Effect ◽  
Dielectric Spectra ◽  
Binary Liquid ◽  
Relaxation Parameters ◽  
Structure Breaking

Abstract Dielectric spectra (up to 72 GHz) have been measured at 20 °C for mixtures of methanol and one of the following substances: morpholine, N-methyl morpholine, N-cyano morpholine, pyrrolidine and N-cyano pyrrolidine. The composition dependence of the relaxation parameters shows close similarities for the morpholines and, on the other hand, for the pyrrolidines, which indicates that a structure breaking effect on methanol is exerted by the former but not by the latter group of substances.

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