Regensburg 2016 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 12: Poster: Colloids and Complex Fluids
CPP 12.13: Poster
Montag, 7. März 2016, 18:15–21:00, Poster B2
manipulating the assembly of wet-deposited nanocolloids based on in situ GISAXS study — •Peng Zhang1, 2 and Stephan Roth1 — 1Deutsches Elektronen-Synchrotron (DESY), Notkestrasse 85, D-22607 Hamburg, Germany — 2Leibniz Institut für Neue Materialien, Campus D2 2, 66123 Saarbrücken, Germany
The assembly of the nanoparticles and formation of ordered structure during solvent evaporation is strongly influenced by the environmental factors like temperature, surfactant and interface interaction. How to track in situ the kinetic process of nanoparticle assembly is vital for the achievements of structure ordering and optimized functionality. This work reports an in situ study of the assembly process of polystyrene nanocolloids by a smartly designed toolkit, combining the nanocolloidal thin film preparation with air-brush spray deposition and structure analysis with grazing-incidence small angle X-ray scattering (GISAXS). The homogeneously dispersed nanocolloidal thin film is successfully prepared with manipulating the solvent evaporation rate. This is contrast to the generally reported inhomogeneous deposition of particles, e.g., "coffee-ring" like structure. By a qualitative analysis, the inhibition of nanocolloidal aggregation is rationalized by the fact that the necessary diffusion time of most adjacent two nanocolloids is longer than the drying time. This finding is expected to be helpful for the fast fabrication of wet-deposited nanocomposite in thin film.