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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 17: Interfaces and Thin Films I

CPP 17.3: Vortrag

Dienstag, 23. März 2010, 10:15–10:30, H39

Solvent evaporation induced ordered array of colloidal particles — •Mottakin M. Abul Kashem, Suttipong Wannapaiboon, Adeline Buffet, Jan Perlich, Rainer Gehrke, and Stephan V. Roth — Hasylab at DESY,Notke Str.85, 22607 Hamburg

Solvent evaporation during drying of a colloidal film or a droplet on a solid substrate can introduce ordering in the final dried film [1]. During solvent evaporation in a droplet of colloidal suspension the colloidal particles are transported towards the periphery while the contact-line among substrate, ambient air and droplet moves towards the center of the droplet. During these two simultaneous processes one or two dimensional ordered nano and microstructures can be spontaneously formed based on the surface free energy of the substrate. Besides, sedimentation of the colloidal particles and capillary forces during drying also play an important role on the formed 3-dimensional ordered structures. In this present investigation, we show the influence of substrate surface on the nano and microstructures formed during solvent evaporation in colloidal droplets containing polystyrene latex microspheres. The arrangement of the nano and microparticles has been investigated and imaged by using optical microscopy, atomic force microscopy (AFM) and grazing incidence small-angle X-ray scattering (GISAXS).

[1] Roth et al., Appl. Phys. Lett. 91, 091915 (2007)