3 years ago

Is There a Liquid–Liquid Phase Transition in Confined Triphenyl Phosphite?

Is There a Liquid–Liquid Phase Transition in Confined Triphenyl Phosphite?
Mateusz Dulski, Kamil Kaminski, Marian Paluch, Paulina Maksym, Olga Madejczyk, Magdalena Tarnacka
The effect of nanoscale confinement on the formation of glacial phase in triphenyl phosphite (TPP), usually assigned to liquid–liquid transition (LLT), was investigated by a combination of differential scanning calorimetry (DSC), broadband dielectric (BDS) and Raman spectroscopies. Although the application of micronscale confinement revealed the presence of prominent LLT [Kurita, R.; Tanaka, H. Phys. Rev. Lett. 2007, 98, 235701]; surprisingly, under the nanolevel geometrical restriction there is no evidence of its existence. Interestingly, at the temperature corresponding to the LLT phenomena, the nanoconfined TPP undergoes crystallization of the suppressed nucleation step. Our data indicates that most likely the formation of the so-called glacial phase is a result of the crystallites formed within the liquid matrix, where the noncrystallized molecules adjacent to their surface form the interfacial layer of slowed down molecular dynamics.

Publisher URL: http://dx.doi.org/10.1021/acs.jpcc.7b05336

DOI: 10.1021/acs.jpcc.7b05336

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