Orientational order of molecular assemblies on inorganic crystals

Citation:

Saville, D. A. ; Chun, J. ; Li, J. L. ; Schniepp, H. C. ; Car, R. ; Aksay, I. A. Orientational order of molecular assemblies on inorganic crystals. Physical Review Letters 2006, 96.

Date Published:

Jan

Type of Article:

Article

ISBN Number:

0031-9007

Accession Number:

WOS:000234608300103

Abstract:

Surfactant micelles form oriented arrays on crystalline substrates although registration is unexpected since the template unit cell is small compared to the size of a rodlike micelle. Interaction energy calculations based on molecular simulations reveal that orientational energy differences on a molecular scale are too small to explain matters. With atomic force microscopy, we show that orientational ordering is a dynamic, multimolecule process. Treating the cooperative processes as a balance between van der Waals torque on a large, rodlike micellar assembly and Brownian motion shows that orientation is favored.