COLL 176 |
| Diptabhas Sarkar, NSF/IUCR Center for Studies in Novel Surfactants, Columbia University, 911 Mudd Building, 500 West 120th. Street, New York, NY 10027 and P Somasundaran, NSF IUCUR Center for Advanced Studies in Novel Surfactants, Columbia University, 500 W120th Street, 911 Mudd, New York, NY 10027. |
| Surface plasmon resonance spectroscopy was used to understand the dynamics of polymer surfactant interactions at solid-liquid interfaces. Polyacrylic acid (PAA) was immobilized at the gold sensor surface through varying degrees of thiolation, which forced the macromolecules to form different loop sizes upon adsorption. Binding of dodecyltrimethylammonium chloride (DTAC) was found to be directly proportional to the loop size. The temporal profile showed three distinct segments with the third segment showing an increased binding rate. This was attributed to the formation of charged double surfactant species, the repulsive interaction between which caused the polymers to open up. |
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Adsorption of Macromolecules at Liquid-Solid Interfaces
Division of Colloid and Surface Chemistry |