Ordered solids formed by solvent evaporation
By evaporating the solvent from a colloidal suspension, several types of structures can result. In many cases, you just get a disordered aggregate, but when the process is optimized, very interesting (and useful) structures can arise by self-assembly. We are particularly interested in self-assembly taking place via a liquid crystalline state, the key challenge often being not to loose it as the last solvent evaporates. The situation is complicated by competing evaporation-induced aggregation processes, such as Marangoni flow or the so-called coffee-stain effect, presenting some quite fascinating soft matter physics problems. A promising approach to retain an ordered state that forms early on during evaporation is to take advantage of a jamming transition, which traps whatever state is present at the transition. This is something we explore in our research on suspensions of cellulose nanocrystals, from which photonic crystal films can be produced by water evaporation if the parameters are chosen wisely.
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Three most recent publications
Isotropic-isotropic phase separation and spinodal decomposition in liquid crystal-solvent mixtures, Catherine G. Reyes, Jörg Baller, Takeaki Araki and Jan P. F. Lagerwall , soft matter, 2019,15, 6044-6054
Liquid crystal elastomer shell actuators with negative order parameter, V. S. R. Jampani, R. H. Volpe, K. Reguengo de Sousa, J. Ferreira Machado, C. M. Yakacki and J. P. F. Lagerwall, Sci.adv.,DOI 10.1126/sciadv.aaw2476
Influence of head group and chain length of surfactants using for stabilising liquid crystal shells,
Anjali Sharma and J.P.F. Lagerwall,Liquid crystals, DOI 10.1080/02678292.2018.1509391
More publications can be found here.