SKM 2023 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 38: Poster: Organic Molecules on Inorganic Substrates II
O 38.6: Poster
Dienstag, 28. März 2023, 18:00–20:00, P2/EG
Understanding the role of adsorbed CTAB in anisotropic nanostructure growth — •Esmée Berger1, Narjes Khosravian1, Joakim Löfgren2, and Paul Erhart1 — 1Department of Physics, Chalmers University of Technology, Gothenburg, Sweden — 2Department of Applied Physics, Aalto University, Espoo, Finland
A crucial step towards improved control over the shapes and sizes of wet-chemically synthesized nanostructures is a detailed theoretical understanding of the growth mechanism's different aspects. One of these aspects is the adsorption of surfactants, for example cetyltrimethylammonium bromide (CTAB), which is commonly used for structural tuning and increased stability. In water, CTAB exhibits a complex phase diagram, with a number of different liquid crystal-like phases. The complexity of the system is further increased during nanostructure growth, due to the presence of surfaces. Recent studies have indicated that the micellar phase of CTAB is the primary mechanism for anisotropic growth of silica and gold nanoparticles. These results were, however, based on a single value of the CTAB surface density. To properly understand the role of CTAB during anisotropic growth of nanostructures, a surface phase diagram must be established. In this work, we develop an understanding of the surface phase diagram from a modeling perspective, by means of molecular dynamics simulations.