Adsorption of oleate on fluorite surface as revealed by atomic force microscopy |
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| Authors: | K Chennakesavulu G Bhaskar Raju S Prabhakar C Madhavan Nair KVGK Murthy |
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| Institution: | aNational Metallurgical Laboratory Madras Centre, CSIR Madras Complex, Taramani, Chennai, 600 113, India;bAU-KBC Research Centre, Madras Institute of Technology, Chromepet, Chennai, 600 044, India |
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| Abstract: | The adsorption of oleic acid / oleate on fluorite surface could be visualized using tapping mode of atomic force microscopy (AFM). The natural fluorite crystals were equilibrated with 10− 3 to 10− 7 M oleate solutions and their AFM images at each concentration along with height profiles were recorded. Even at low oleate concentration of 1 × 10− 7 M, concomitant monolayer and bilayer structures were observed. It suggests that normal–normal bonding of hydrocarbon chains takes place before the surface is completely covered by the monolayer. Multi-layer adsorption of oleate was observed at oleate concentrations of above 10− 4 M. The tapping mode AFM can be utilized to visualize the topography of surfaces adsorbed with surfactant molecules. |
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| Keywords: | Fluorite Sodium oleate Atomic force microscopy Topography Adsorption |
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