Experimental signatures of a nonequilibrium phase transition near the crossover point of a Langmuir monolayer

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Bera, P K and Kandar, A K and Krishnaswamy, Rema and Sood, A K (2019) Experimental signatures of a nonequilibrium phase transition near the crossover point of a Langmuir monolayer. Journal of Physics: Condensed Matter, 31 (50). p. 504004. ISSN 0953-8984

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Abstract

We investigate the response of the two-dimensional (2D) continuous non-particulate film of surfactant sorbitan tristearate confined at the air-water interface under oscillatory shear deformation. The time dependence of various rheological parameters show critical-like behavior at a value of strain amplitude close to the crossover point of elastic ( ) and viscous ( ) shear moduli. Imposing oscillatory shear of different strain amplitudes ( ) above and below the crossover strain amplitude ( ) over a large number of cycles, we quantify the temporal dependence of interfacial viscous modulus, phase angle ( ) as well as higher harmonic components of stress. The number of shear cycles ( ) required for these quantities to reach the steady state value diverges near . The steady state values of the third harmonic ( ) show order parameter like behavior indicating the importance of higher order harmonics near the nonequilibrium transition. We further show that the energy dissipation per cycle per unit volume has a marked change near , consistent with continuum level nonequilibrium shear-transformation-zone model of amorphous viscoplasticity.

Item Type:	Article
Authors:	Bera, P K and Kandar, A K and Krishnaswamy, Rema and Sood, A K
Document Language:	Language English
Subjects:	Natural Sciences > Physics Natural Sciences > Chemistry & allied sciences
Divisions:	Azim Premji University - Bengaluru > School of Arts and Sciences
Full Text Status:	None
URI:	http://publications.azimpremjiuniversity.edu.in/id/eprint/7229
Publisher URL:	https://doi.org/10.1088/1361-648X%2Fab4235

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