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- Title
New insight into 3-picoline—deuterium oxide (D<sub>2</sub>O) mixtures of limited miscibility with the lower critical consolute temperature.
- Authors
Kalabiński, Jakub; Drozd-Rzoska, Aleksandra; Rzoska, Sylwester J.
- Abstract
Coexistence curves in mixtures of limited miscibility with the lower critical consolute temperature (LCT), of 3-picoline with deuterium oxide (D2O), and D2O/H2O have been determined. They were tested with respect to the order parameter, the diameter of the binodal, and coordinates of the critical consolute point (critical temperature T C and critical concentration ϕ C ). Studies were carried out using the innovative method based on the analysis of relative volumes occupied by coexisting phases, yielding high-resolution data. The clear violation of the Cailletet-Mathew law of rectilinear diameter for the LCT mixtures of limited miscibility is evidenced. For the order parameter, the new distortion-sensitive analysis method yielded the evidence for the model-value of the order parameter critical exponent β = 0.326 ± 0.003 , up to ca. 1 K from T C . Finally, the simple & easy method for determining the critical concentration by testing relative volumes of coexisting phases (or alternatively fractional meniscus heights, h) is presented. The significance of the invariant value h C = h T C , ϕ C = 1 / 2 is highlighted. The appearance of the milky & bluish critical opalescence is also shown.
- Subjects
DEUTERIUM oxide; CRITICAL temperature; MISCIBILITY; MIXTURES; CRITICAL point (Thermodynamics)
- Publication
European Physical Journal E -- Soft Matter, 2022, Vol 45, Issue 9, p1
- ISSN
1292-8941
- Publication type
Article
- DOI
10.1140/epje/s10189-022-00224-z