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Title: The logarithmic relaxation process and the critical temperature of liquids in nano-confined states
Authors: Chathoth, SM
Chen, C
Yu, DH
Keywords: Relaxation
Transition temperature
Issue Date: 12-Jul-2017
Publisher: International Conference on Neutron Scattering
Citation: Chathoth, S. M., Chen, C., & Yu, D. H. (2017). The logarithmic relaxation process and the critical temperature of liquids in nano-confined states. Paper presented at ICNS 2017 (International Conference on Neutron Scattering), Daejeon, South Korea, 9 to 13 July 2017. Retrieved from:
Abstract: The logarithmic relaxation process is the slowest of all relaxation processes and is exhibited by only a few molecular liquids and proteins. Bulk salol, which is a glass-forming liquid, is known to exhibit logarithmic decay of intermediate scattering function for the ?-relaxation process. Here, we report the influence of nanoscale confinements on the logarithmic relaxation process and changes in the microscopic glass-transition temperature of salol in the carbon and silica nanopores. The generalized vibrational density-of-states of the confined salol indicates that the interaction of salol with ordered nanoporous carbon is hydrophilic in nature whereas the interaction with silica surfaces is more hydrophobic. The mode-coupling theory critical temperature derived from the QENS data shows that the dynamic transition occurs at much lower temperature in the carbon pores than in silica pores. The results of this study indicate that, under nano-confinements, liquids that display logarithmic ?-relaxation phenomenon undergo a unique glass transition process.
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