Density
and Volumetric Properties of Aqueous Solutions
of Trimethylamine <i>N</i>‑Oxide in the Temperature
Range from (278.15 to 323.15) K and at Pressures up to 100 MPa
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Abstract
Densities of aqueous solutions of
trimethylamine <i>N</i>-oxide (TMAO) were measured over
the concentration range (0.0875
to 4.3251) mol·kg<sup>–1</sup> at temperatures (278.15,
288.15, 298.15, 308.15, and 323.15) K and pressures (0.101, 10, 25,
50, 75, and 100) MPa. Volumetric properties such as apparent molar
volume of TMAO, <i>V</i><sub>ϕ,2</sub>, molar isothermal
compression, <i>K</i><sub><i>T</i>,m</sub>, molar
isobaric expansion, <i>E</i><sub><i>P</i>,m</sub>, and internal pressure, <i>P</i><sub>int</sub>, of its
aqueous solutions were calculated depending on concentration, temperature,
and pressure. The volumetric partial properties of TMAO at infinite
dilution in water (<i>V</i><sub>2</sub><sup>∞</sup>, <i>K</i><sub><i>T</i>,2</sub><sup>∞</sup>, and <i>E</i><sub><i>P</i>,2</sub><sup>∞</sup>) were also determined. The results
were discussed from the standpoint of solute–solute and solute–solvent
interactions