- Title
- Adsorption of polyether block copolymers at silica-water and silica-ethylammonium nitrate interfaces
- Creator
- Chen, Zhengfei; Kobayashi, Yumi; Webber, Grant B.; Ueno, Kazuhide; Watanabe, Masayoshi; Warr, Gregory G.; Atkin, Rob
- Relation
- Langmuir Vol. 31, Issue 25, p. 7025-7031
- Publisher Link
- http://dx.doi.org/10.1021/acs.langmuir.5b01500
- Publisher
- American Chemical Society
- Resource Type
- journal article
- Date
- 2015
- Description
- Atomic force microscope (AFM) force curves and images are used to characterize the adsorbed layer structure formed by a series of diblock copolymers with solvophilic poly(ethylene oxide) (PEO) and solvophobic poly(ethyl glycidyl ether) (PEGE) blocks at silica-water and silica-ethylammoniun nitrate (EAN, a room temperature ionic liquid (IL)) interfaces. The diblock polyethers examined are EGE₁₀₉EO₅₄, EGE₁₁₃EO₁₁₃, and EGE₁₀₄EO₁₇₈. These experiments reveal how adsorbed layer structure varies as the length of the EO block varies while the EGE block length is kept approximately constant; water is a better solvent for PEO than EAN, so higher curvature structures are found at the interface of silica with water than with EAN. At silica-water interfaces, EGE₁₀₉EO₅₄ forms a bilayer and EGE₁₁₃EO₁₁₅ forms elongated aggregates, while a well-ordered array of spheres is present for EGE₁₀₄EO₁₇₈. EGE₁₀₉EO₅₄ does not adsorb at the silica-EAN interface because the EO chain is too short to compete with the ethylammonium cation for surface adsorption sites. However, EGE₁₁₃EO₁₁₅ and EGE₁₀₄EO₁₇₈ do adsorb and form a bilayer and elongated aggregates, respectively.
- Identifier
- http://hdl.handle.net/1959.13/1323999
- Identifier
- uon:24931
- Identifier
- ISSN:1520-5827
- Language
- eng
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