Berlin 2018 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 64: Nanostructures, Nanostructuring and Nanosized Soft Matter II

CPP 64.8: Vortrag

Donnerstag, 15. März 2018, 11:30–11:45, PC 203

Interaction of Cationic Surfactants with Protein in Tubular Silica Nanopores Studied by Small-Angle Neutron Diffraction — Anja F. Hörmann¹, •Albert Prause¹, Viviana Cristiglio², Michael Gradzielski¹, and Gerhard H. Findenegg¹ — ¹Department of Chemistry, Technical University of Berlin, Berlin, Germany — ²Institut Laue-Langevin, Grenoble, France

The interactions of surfactants with porous materials play an important role in environmental, chemical and medical applications. We studied nanostructures formed by adsorption and self-assembly of the cationic surfactants dodecyl pyridinium chloride (DPCl) and hexadecyl pyridinium chloride (CPCl) in the tubular mesopores of SBA-15 with pore diameter of 7 nm. Small-angle neutron diffraction (SAND) was used at silica contrast-matching conditions to obtain structural information from diffuse scattering contributions and the reappearance of the SBA-15 Bragg reflexes. For CPCl it could be shown that due to its high affinity to the negatively charged pore wall and the strong hydrophobic interaction of its tails the surfactant forms a monolayer via the growth of monolayer patches with increasing bulk concentration. Furthermore, we studied the co-adsorption of the globular protein lysozyme (Lyz) and CPCl. Whereas the pre-adsorption of CPCl is found to hinder the adsorption of Lyz sterically, the presence of Lyz seems to promote the homogeneity of the adsorbed material at the pore wall, as visible in the appearance of hollow cylinder scattering at lower adsorption fraction of surfactant f_s.