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Contents Vol 64(9)

Dynamics of Volume Expansion of De-Mixing Liquids after Pulsed IR Heating

Jonathan Hobley A C , Sergey Gorelik A , Yutaka Kuge B , Shinji Kajimoto B , Motohiro Kasuya B , Koji Hatanaka B and Hiroshi Fukumura B
+ Author Affiliations
- Author Affiliations

A Institute of Materials Research and Engineering (IMRE) A*STAR (Agency for Science Technology and Research), 3 Research Link, 117602, Singapore.

B Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan.

C Corresponding author. Email: hobleyj@imre.a-star.edu.sg

Australian Journal of Chemistry 64(9) 1274-1281 https://doi.org/10.1071/CH11171
Submitted: 29 April 2011  Accepted: 6 July 2011   Published: 16 September 2011

Abstract

Triethylamine (TEA)–water mixtures have a critical-temperature (Tc). Below Tc the mixture exists as one phase and above Tc it exists in two phases. The de-mixed volume is different to the mixed volume. A nanosecond pulsed-laser heated a TEA–water mixture so that it de-mixed. The resulting dynamics of volume expansion were monitored using interferometry. For T-jumps within the one phase region the dynamics of volume change were limited by the speed of sound. However, T-jumps between the one and two phase regions also manifested a slower volume change associated with the de-mixing process. After 150 ns, the volume of the de-mixed TEA–water was consistent with the equilibrium volume change. This suggests that, within 150 ns, the system had split into phase-domains having equilibrium compositions of TEA and water. Subsequently the phase domains would simply merge and grow resulting in no further volume change to reduce surface tension between the phases.


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