Theoretical and Computational Chemistry

Obtaining and characterizing stable bicontinuous cubic morphologies and their nanochannels in lyotropic liquid crystal membranes

Authors

Abstract

Amphiphilic monomers in polar solvents can self-assemble into lyotropic liquid crystal (LLC) bicontinuous cubic structures under the right composition and temperature conditions. After cross-linking, the resulting polymer membranes with 3D continuous uniform channels are excellent candidates for filtration applications. Designing such membranes with desired physical and chemical properties requires molecular level understanding of the structure, which can be obtained through molecular modeling. However, building molecular models of bicontinuous cubic structures is challenging due to their narrow regime of stability and the difficulty of self-assembly of large unit cells in molecular simulations. We developed a protocol for building stable bicontinuous cubic unit cells involving both parameterization and assembly of the components. We validated theoretical structure against experimental results for one such LLC monomer and provide insight into the structure missing in experimental data, as well as demonstrate the qualitative nature of water and solute transport through these membranes.

Content

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Supplementary material

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Supplemental information
Details on building and parameterizing all-atom models, documentation on building the coarse-grained models and modifications made to the original Martini parameters, details on the back mapping procedure, description of the cross-linking scheme and software implementation, supplementary figures showing structural and transport properties of the LLC polymer membrane