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Self-Healing of Surfactant Surface Micelles on Millisecond Time Scales Hannes C. Schniepp, Dudley A. Saville, and Ilhan A. Aksay*
 

Summary: Self-Healing of Surfactant Surface Micelles on Millisecond Time Scales
Hannes C. Schniepp, Dudley A. Saville, and Ilhan A. Aksay*
Department of Chemical Engineering, Princeton UniVersity, Princeton, New Jersey 08544
Received April 10, 2006; Revised Manuscript Received August 21, 2006; E-mail: iaksay@princeton.edu
Micellar coatings of surfactants at solid-liquid interfaces can
provide colloidal stability,1,2 corrosion inhibition,3 and boundary
lubrication.4-6 Understanding the dynamics of such coatings is
necessary to the optimization of self-healing, a characteristic of
micellar structures. Self-healing rates that are sufficient to counter
the rate of defect formation due to physical or chemical attack are
required for successful engineering applications. Although some
dynamic parameters of bulk and surface processes have been
reported,7-10 the time scale for micellar surface self-assembly
remains unknown. In this work, we present a novel atomic force
microscopy (AFM) technique that allows us to visualize this self-
healing process over millisecond time scales at nanometer spatial
resolution. No traditional technique used to detect surface adlayers,
including neutron reflectometry,11 optical reflectometry,12,13 ellip-
sometry,14 and Fourier transform infrared spectroscopy (FTIR)10
combines such high temporal and spatial resolutions. Using our

  

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

 

Collections: Materials Science