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Session D40 - Poster Session I.
POSTER session, Monday afternoon, March 12
Exhibit Hall, Washington State Convention Center

[D40.044] Template-Directed Convective Assembly of Colloidal Crystals

jian Zhang, Subrata Sanyal, Keng-hui Lin (University of Pennsylvania), Arjun G. Yodh

We investigate the use of geometirc surface templates to enhance the convective assembly of colloidal crystals[1,2]. In our experiment, we immerse on- and two- dimensional grating templates as substrates into ~5 volume percent monodisperse colloidal suspension at 50 degree. Assembly oxxurs as the solvent evaporates[2]. SEM characterization revealed ~50 micron single domain size, [100]-oriented fcc crystals. Additional experiments are underway to investigate the effect of the added depletents on the assembly and crystal quality.

Fundied by NSF (DMR99-71226), MRSEC (DMR00-79909), NASA (NAG3-2172).

[1] K.H. Lin etal, Phys. Rev. Lett, 85, 1770(2000). [2] P. Jiang etal, Chem. Mater., Vol.11, No.8, 2132(1999)

Part D of program listing