Thermal Diffusion in Liquids; The Effect of Non-ideality and Association.

Tichacek, L. J.; Kmak, W. S.; Drickamer, H. G.

doi:10.1021/j150539a038

Cited by 95 publications

(36 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For the systems regarded here we observe the following sequence x ± s = 0.08, 0.095, 0.11, 0.14, > 0.18 and 0.195 for 1-propanol, 2-propanol, acetone, ethanol, methanol and DMSO in water. In the case of methanol/water the sign change concentration could not be determined precisely from the literature data 37 and also TDFRS measurements were not possible in the entire concentration range due to the low refractive index contrast between methanol and water. Therefore, we estimated the highest concentration of methanol, below which no sign change occurs by measuring diluted aqueous solutions.…”

Section: B Relation Between the Thermal Diffusion Motion And A Strucmentioning

confidence: 99%

Systematic study of the thermal diffusion in associated mixtures

Polyakov

Wiegand

2008

The Journal of Chemical Physics

View full text Add to dashboard Cite

We performed systematic temperature and concentration dependent measurements of the Soret coefficient in different associated binary mixtures of water, deuterated water, dimethyl sulfoxide (DMSO), methanol, ethanol, acetone, methanol, 1-propanol, 2-propanol, propionaldehyde using the so called thermal diffusion forced Rayleigh scattering method. For some of the associating binary mixtures such as ethanol/water, acetone/water and DMSO/water the concentration x ± w at which the Soret coefficient changes its sign does not depend on temperature and is equal to the concentration x × w where the Soret coefficient isotherms intersect. While for others such as 1-propanol/water, 2-propanol/water and ethanol/DMSO the sign change concentration is temperature dependent, which is the typical behavior observed for non-associating mixtures. For systems with x ± w = x × w we found that x ± w depends linearly on the ratio of the vaporization enthalpies of the pure components. Probably due to the similarity of methanol and DMSO we do not observe a sign change for this mixture. The obtained results are related to structural changes in the fluid observed by nuclear magnetic resonance, mass specrometric and X-ray experiments in the literature. Furthermore we discuss the influence of hydrophilic and hydrophobic interactions and the solubility on thermal diffusion behavior.

show abstract

Section: B Relation Between the Thermal Diffusion Motion And A Strucmentioning

confidence: 99%

Systematic study of the thermal diffusion in associated mixtures

Polyakov

Wiegand

2008

The Journal of Chemical Physics

View full text Add to dashboard Cite

show abstract

“…6,11,12 For many associating liquids, where specific interactions such as hydrogen-bonding or electrostatic interactions exist, sign changes of S T with composition have been observed. 6,9,15,16 Molecular dynamics (MD) simulations have become an important tool in the investigation of thermal diffusion behavior of Lennard-Jones model fluids and small-molecule liquids. [17][18][19][20][21] Lately, the simulation techniques for non-equilibrium properties have been improved, which have led to a reasonable agreement between simulations and experiments for associating and non-associating liquid mixtures.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of the Soret effect in acetone/water and dimethylsulfoxide/water mixtures

Ning

Wiegand²

2006

The Journal of Chemical Physics

View full text Add to dashboard Cite

show abstract

“…Their difference Q 1 −Q 2 = T S is related to Eastman's entropy of transfer S introduced above (2). Dissipative aspects have been discussed by identifying Q with Eyring's viscous activation energy E that is defined through the temperature dependence of the viscosity η = η 0 e E/k B T [49][50][51][52]; a similar picture arises when relating Q to partial enthalpies [53], partial volumes [54] or the self-diffusion activation energy [55]. A refined description for the mutual interactions of the molecular species is achieved by introducing thermodynamic or "activity" factors in the chemical potential or the partial pressure [56,57].…”

Section: A Thermostatic Approachmentioning

confidence: 99%

Is Soret equilibrium a non-equilibrium effect?

Würger

2013

Comptes Rendus. Mécanique

View full text Add to dashboard Cite

Recent thermophoretic experiments on colloidal suspensions revived an old debate, namely whether the Soret effect is properly described by thermostatics, or necessarily requires nonequilibrium thermodynamics. Based on colloidal transport theory and the entropy production of the related viscous flow, our analysis leads to the conclusion that the equilibrium approach may work for small ions, yet fails for colloidal particles and polymers. Regarding binary molecular mixtures, our results shed some doubt on the validity of thermostatic approaches that derive the Soret coefficient from equilibrium potentials.

show abstract

Thermal Diffusion in Liquids; The Effect of Non-ideality and Association.

Cited by 95 publications

References 1 publication

Systematic study of the thermal diffusion in associated mixtures

Systematic study of the thermal diffusion in associated mixtures

Experimental investigation of the Soret effect in acetone/water and dimethylsulfoxide/water mixtures

Is Soret equilibrium a non-equilibrium effect?

Contact Info

Product

Resources

About