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Surfactant Aggregates at Rough Solid-Liquid Interfaces Hannes C. Schniepp, Ho C. Shum, Dudley A. Saville, and Ilhan A. Aksay*
 

Summary: Surfactant Aggregates at Rough Solid-Liquid Interfaces
Hannes C. Schniepp, Ho C. Shum, Dudley A. Saville, and Ilhan A. Aksay*
Department of Chemical Engineering, Princeton UniVersity, Princeton, New Jersey 08544-5263
ReceiVed: May 6, 2007; In Final Form: June 10, 2007
We demonstrate improved atomic force microscopic imaging of surfactant surface aggregates, featuring an
increase in the topography contrast by several hundred percent with respect to all previous studies. Surfactant
aggregates on rough gold surfaces, which could not be imaged previously because of low resolution, display
substantially different morphologies when compared with atomically smooth materials.
Introduction
The adsorption of surfactants at interfaces is important for
many technical applications and industrial processes such as
detergency, froth flotation,1 boundary lubrication,2-4 colloid
stabilization,5,6 dispersion,7 and corrosion inhibition.8,9 Interac-
tions of surfactants with metallic surfaces have become impor-
tant in the production of nanoparticles.10-12 Traditionally, the
adsorption behavior of surfactants has been studied by depletion
methods13-18 and streaming potential techniques.16,19 More
recently, experimental efforts applying ellipsometry,20-22 optical
reflectometry,23,24 electrochemical methods,9 quartz crystal
microbalances,25 and Fourier transform infrared spectroscopy26

  

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

 

Collections: Materials Science