Phase transitions in Langmuir films of fatty acids: L 2 - L 2 ′ - L 2 ″ triple point and order of the transitions - Archive ouverte HAL Access content directly
Journal Articles Physical Review E Year : 1996

Phase transitions in Langmuir films of fatty acids: L 2 - L 2 ′ - L 2 ″ triple point and order of the transitions

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Abstract

Using Brewster angle microscopy we have studied the low-temperature region of the phase diagram of Langmuir monolayers of long-chain fatty acids. We have shown that the transitions between the three tilted phases, L2, L′2, and L''2 are first order, and have located the triple point precisely. We have observed a radical change of the tilt-azimuth texture at the L2-L''2 phase transition, even though the tilt direction with respect to the lattice is the same in the two phases. The transition between the tilted phase L''2 and the crystalline untilted phase CS is also studied. Its character possibly changes from second order below the L2-L′2-L''2 triple point to first order above. © 1996 The American Physical Society.
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hal-03876182 , version 1 (28-11-2022)

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S. Rivière-Cantin, S. Hénon, J. Meunier. Phase transitions in Langmuir films of fatty acids: L 2 - L 2 ′ - L 2 ″ triple point and order of the transitions. Physical Review E , 1996, 54 (2), pp.1683-1686. ⟨10.1103/PhysRevE.54.1683⟩. ⟨hal-03876182⟩
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