[16p-Z24-1~18] 12.3 Functional Materials and Novel Devices

[16p-Z24-18] Effects of large graphene oxide nanosheets on the organization of a nonionic surfactant

〇Miho Tanimura¹, Rei Chisoku¹, Yoshiyuki Sugahara^1,3, Guegan Regis² (1.Waseda Univ., 2.Global Center for Science and Engineering, 3.Kagami Memorial Inst. for Materials Science and Technology)

Keywords:colloids

The assemblies formed by colloidal systems such as inorganic nanosheets or organic moieties showing liquid crystalline (LC) organization can lead to the formation of new edifices or hierarchical architectures that are not possible to be obtained in bulk systems. In this study, an octaetyylene glycol monododecyl ether (C₁₂E₈) nonionic surfactant aqueous solution and different types of graphene oxide (GO) showing short and large lateral sizes were associated. The phase diagrams of the colloidal mixtures were studied by a set of complementary techniques (small-angle X-ray scattering, polarized optical microscopy) and revealed no changes of the C₁₂E₈-H₂O in the presence of short GO. In contrast, by associating large GO, the excluded volume effects considerably affect the phase diagram, where the aniotropic nanosheets restrain the accessibility to water for the surfactant, leading to a reorganization of the C₁₂E₈ phases at lower concentration that the bulk C₁₂E₈-H₂O system.