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cluster aggregation; dynamic arrest; gel; spinodal decomposition Association reactions; Differential equations; Gelation; Gels; Phase separation; Spinodal decomposition; Thermoanalysis; Thermodynamic properties; Brownian Dynamics; Cluster aggregation; Dynamic arrest; Dynamic studies; Gel phasis; Long-range repulsions; Non equilibrium; Short-range attraction; Systematic study; Thermodynamic state; Liquids; article; decomposition; diffusion coefficient; gelation; phase separation; relaxation time
In this work a systematic study over a wide number of final thermodynamic states for two gel-forming liquids was performed. Such two kind of gel formers are distinguished by their specific interparticle interaction potential. We explored several thermodynamic states determining the thermodynamic, structural and dynamic properties of both liquids after a sudden temperature change. The thermodynamic analysis allows to identify that the liquid with short range attraction and long range repulsion lacks of a stable gas-liquid phase separation liquid, in contrast with the liquid with short range attractions. Thus, although for some thermodynamic states the structural behavior, measured by the static structure factor, is similar to and characteristic of the gel phase, for the short range attractive fluid the gel phase is a consequence of a spinodal decomposition process. In contrast, gelation in the short range attraction and long range repulsion liquid is not due to a phase separation. We also analyze the similarities and differences of the dynamic behavior of both systems through the analysis of the mean square displacement, the self part of the intermediate scattering function, the diffusion coefficient and the α relaxation time. Finally, using one of the main results of the non-equilibrium self-consistent generalized Langevin equation theory (NE-SCGLE), we determine the dynamic arrest phase diagram in the volume fraction and temperature (φ vs T) plane. © 2022 IOP Publishing Ltd.
On the dynamically arrested states of equilibrium and non-equilibrium gels: A comprehensive Brownian dynamics study
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Estancias Posdoctorales Nacionales 1631, 257636, 422753/ 2020, CB-2015-01; Consejo Nacional de Ciencia y Tecnología, CONACYT
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