Electrostatic Interaction between Ionic Polymer Grafted Surfaces Studied by Atomic Force Microscopy
✍ Scribed by Junfeng Zhang; Emiko Uchida; Yoshikimi Uyama; Yoshito Ikada
- Publisher
- Elsevier Science
- Year
- 1997
- Tongue
- English
- Weight
- 367 KB
- Volume
- 188
- Category
- Article
- ISSN
- 0021-9797
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✦ Synopsis
complex because they depend on the multiple point binding of
To study the electrostatic interaction between two ionic polypolycations to the negatively charged mica. mer grafted surfaces in aqueous media, an atomic force micro-
The desorption and multiple point binding of polymer scopic tip surface was modified by graft polymerization of a catchains can be avoided by covalently fixing soluble polymer ionic monomer, dimethylaminoethyl methacrylate ( DMAEMA ) , chains on a solid polymer surface through chemical immobiafter being coated with a thin layer of cyanoacrylate polymer. A lization technologies such as surface graft polymerization of poly ( ethylene terephthalate) ( PET ) film which was the countmonomers or coupling reaction of existing polymer moleersurface of the modified tip for the measurement of atomic force cules onto the substrate polymer. However, many atomic microscopy was also modified by surface graft polymerization of force microscopic studies have revealed that polymer sur-DMAEMA and an anionic monomer, acrylic acid ( AAc ) . An appreciable adhesive force was observed in water between the faces are far from molecular smoothness although it is re-DMAEMA-grafted tip and the AAc grafted PET surface, while quired for SFA measurements (23).
a repulsive interaction was noticed between the DMAEMA-Another approach for measuring surface forces is to use grafted tip and the DMAEMA-grafted PET film. Addition of KCl atomic force microscopy (AFM). Since the first report by to the medium for the atomic force measurement exhibited a Ducker et al. on the direct measurement of colloidal forces remarkable reduction in the adhesive interaction. These interacusing AFM (24), a number of investigations have been cartions were attributed to the Coulombic force between the grafted ried out to measure attractive van der Waals forces, electroionic polymer chains. ᭧ 1997 Academic Press static forces (double-layer forces) (25), hydrophobic forces