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Direct AFM measurements of morphology and interaction force at solid-liquid interfaces between DTAC/CTAC and mica

  • Materials, Metallurgy, Chemical and Environmental Engineering
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Abstract

The adsorption of dedecyltrimethylammoium chloride (DTAC) and hexadecyltrimethylammoium chloride (CTAC) on muscovite mica substrates was examined using atomic force microscopy (AFM). Adsorption morphology images and interaction forces of cationic surfactants at solid-solution interfaces were measured in tapping mode and PicoForce mode, respectively. The images demonstrated that the adsorbed structure was varied by a variety of surfactant concentrations. The adsorbed layer on mica was monolayer at first, and then became bilayer. A striped adsorbed structure was observed in a higher concentration of CTAC, which could not be found in any other concentrations of DTAC. For force measurements, the repulsive force was exponentially decreasing with the concentration increasing till a net attractive force appeared. A largest attractive force could be observed at a certain concentration, which was close to the point of charge neutralization. The results also showed a significant impact of hydrocarbon chain length on adsorption. An adsorption simulation was established to give a clear understanding of the interaction between cationic surfactants and mica.

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Authors and Affiliations

  1. School of Minerals Processing and Bioengineering, Central South University, Changsha, 410083, China

    Zhen Xie  (谢珍), Hao Jiang  (蒋昊), Zhong-cheng Sun  (孙忠诚) & Qin-hong Yang  (杨沁红)

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  1. Zhen Xie  (谢珍)
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  2. Hao Jiang  (蒋昊)
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  3. Zhong-cheng Sun  (孙忠诚)
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  4. Qin-hong Yang  (杨沁红)
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Correspondence to Hao Jiang  (蒋昊).

Additional information

Foundation item: Project(50974134) supported by the National Natural Science Foundation of China

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Xie, Z., Jiang, H., Sun, Zc. et al. Direct AFM measurements of morphology and interaction force at solid-liquid interfaces between DTAC/CTAC and mica. J. Cent. South Univ. 23, 2182–2190 (2016). https://doi.org/10.1007/s11771-016-3275-x

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  • DOI: https://doi.org/10.1007/s11771-016-3275-x

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