Sánchez Puga, PabloTajuelo Rodríguez, JavierMartínez Pedrero, FernandoOrtega FranciscoRubio Álvarez, Miguel Ángel2026-02-202026-02-202025-08-13Sánchez-Puga, P., Tajuelo, J., Martínez-Pedrero, F., Guzmán, E., Ortega, F., & Rubio, M. A. (2025). Phase transitions of untilted fatty-acid Langmuir monolayers during isobaric heating and cooling: Interfacial rheology results. Physical Review. E, 112(2), 025503. https://doi.org/10.1103/19q6-m9h72470-0045https://doi.org/10.1103/19q6-m9h7https://hdl.handle.net/20.500.14468/31884This is an Accepted Manuscript of an article published by American Physical Society in "Physical Review. E, 112(2), 025503", available at: https://doi.org/10.1103/19q6-m9h7Este es el manuscrito aceptado del artículo publicado por American Physical Society en "Physical Review. E, 112(2), 025503", disponible en línea: https://doi.org/10.1103/19q6-m9h7We 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.eninfo:eu-repo/semantics/openAccess2204 Física de Fluidosartículo2470-0053