2026-06-08T03:24:50Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/1235662025-09-01T23:45:52Zcom_20.500.14352_14col_20.500.14352_15

00925njm 22002777a 4500 dc Sánchez-Puga, Pablo author Tajuelo, Javier author Martínez Pedrero, Fernando author Guzmán Solís, Eduardo author Ortega Gómez, Francisco author Rubio, Miguel A. author 2025-08-13 We study the two-dimensional melting of fatty acid Langmuir monolayers via the mechanical properties of their untilted phases, compact solid (CS), solid (S), and superliquid (LS). Taking the dynamic moduli as order parameters in isobaric temperature sweeps of behenic and arachidic acid monolayers, the CS-S and S-LS transitions appear as continuous transitions. However, a discontinuity appears in a high-order crossed susceptibility that involves the derivative of the dynamic moduli with respect to the control parameter (temperature). The critical value of the shear storage modulus at the melting temperature agrees with the prediction of the KTHNY theory, but the characteristic exponent does not. 10.1103/19q6-m9h7 https://hdl.handle.net/20.500.14352/123566 journals.aps.org/pre/abstract/10.1103/19q6-m9h7 Phase transitions of untilted fatty-acid Langmuir monolayers during isobaric heating and cooling: Interfacial rheology results