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Home List of Titles Adsorption of nonionic surfactants (CnEm) at the silica-water and cellulose-water interface
Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/231497
- Adsorption of nonionic surfactants (CnEm) at the silica-water and cellulose-water interface
- Singh, Suprita K.; Notley, Shannon M.
- The adsorption of nonionic surfactants to the silica−water and cellulose−water interfaces was studied using optical reflectometry (OR) and soft-contact atomic force microscopy imaging. The polyethylene oxide alkyl ethers C14E6 and C16E8 were shown to readily adsorb to both interfaces. The kinetics of the adsorption process as well as the equilibrium surface excess was determined using OR. In agreement with previous studies, the short headgroup surfactant C14E6 adsorbed to a greater extent than the longer headgroup surfactant C16E8 on silica. This trend was also observed for the cellulose−water interface. The structure of the adsorbed surfactant layer above the critical surface aggregation concentration (csac) was visualized using the soft contact imaging technique for both interfaces. On the silica surface, the layer structure for both surfactants mostly showed spherical aggregates, however, with some elongation into rods being more prevalent for C14E6. Similar structures were observed on the cellulose surface, but imaging was more difficult due to the soft gel-like nature of the cellulose thin film in water. This suggests that these surfactants adsorb in a cooperative fashion above the critical micelle concentration (cmc) with a similar interaction between surfactant headgroup and surface for both silica and cellulose. No evidence was seen for the penetration of surfactant molecules into the cellulose surface or any solubilization of the interface.
- Publication type
- Journal article
- Journal of Physical Chemistry B, Vol. 114, no. 46 (Nov 2010), pp. 14977-14982
- Publication year
- FOR Code(s)
- 02 Physical Sciences; 03 Chemical Sciences; 09 Engineering
- Adsorption process; Agglomeration; Alkyl ethers; Atomic force; Atomic force microscopy; Cellulose surfaces; CMC; Critical micelle concentration; Critical surfaces; Ethers; Gel-like nature; Imaging techniques; Layer structures; Micelles; Nonionic surfactants; Optical reflectometry; Polyethylene glycols; Polyethylene oxides; Silica surface; Soft contacts; Spherical aggregates; Surface excess; Surface structure; Surfactant layers; Surfactant molecules; Water interface
- American Chemical Society
- Publisher URL
- Copyright © 2010 American Chemical Society.
- Peer reviewed