Solute aggregation in dilute aqueous solutions of tetramethylurea

L. Almásy, Adél Len, Noémi Kinga Székely, Josef Pleštil

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Aqueous solutions of tetramethylurea (TMU) were studied by small-angle neutron and X-ray scattering at temperatures 10, 25 and 40 °C in the TMU mole fraction range of 0.0125-0.025. The scattering data indicate preferential attractive interaction between the solute molecules, which becomes stronger as the temperature increases. From SANS data, concentration fluctuations and Kirkwood-Buff integrals have been calculated. The experimental data reveal a considerable solute-solute attraction above 0.01 mole fraction of TMU. These findings indicate that in addition to the usually assumed solute caging by water molecules, solute clustering of hydrophobic nature should also be considered for this system.

Original languageEnglish
Pages (from-to)114-119
Number of pages6
JournalFluid Phase Equilibria
Volume257
Issue number1
DOIs
Publication statusPublished - Aug 15 2007

Fingerprint

solutes
Agglomeration
aqueous solutions
Molecules
X ray scattering
Neutrons
Scattering
Temperature
Water
scattering
attraction
molecules
1,1,3,3-tetramethylurea
neutrons
temperature
water
x rays
interactions

Keywords

  • Concentration fluctuation
  • Hydrophobic interaction
  • Neutron scattering
  • Non-ideal mixture
  • TMU

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes
  • Physical and Theoretical Chemistry

Cite this

Solute aggregation in dilute aqueous solutions of tetramethylurea. / Almásy, L.; Len, Adél; Székely, Noémi Kinga; Pleštil, Josef.

In: Fluid Phase Equilibria, Vol. 257, No. 1, 15.08.2007, p. 114-119.

Research output: Contribution to journalArticle

Almásy, L. ; Len, Adél ; Székely, Noémi Kinga ; Pleštil, Josef. / Solute aggregation in dilute aqueous solutions of tetramethylurea. In: Fluid Phase Equilibria. 2007 ; Vol. 257, No. 1. pp. 114-119.
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