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Orientational Order of Molecular Assemblies on Inorganic Crystals D. A. Saville,1
 

Summary: Orientational Order of Molecular Assemblies on Inorganic Crystals
D. A. Saville,1
J. Chun,1
J.-L. Li,2
H. C. Schniepp,1
R. Car,2
and I. A. Aksay1
1
Department of Chemical Engineering, Princeton University, Princeton, New Jersey 08544, USA
2
Department of Chemistry, Princeton University, Princeton, New Jersey 08544, USA
(Received 19 August 2005; published 4 January 2006)
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.
DOI: 10.1103/PhysRevLett.96.018301 PACS numbers: 82.70.Dd, 81.07.b, 81.16.Dn, 82.70.Uv

  

Source: Aksay, Ilhan A. - Department of Chemical Engineering, Princeton University

 

Collections: Materials Science