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Open AccessArticle

On the Morphology of the SDS Film on the Surface of Borosilicate Glass

Department of Applied Chemistry, National Chia Yi University, Chiayi City 60004, Taiwan
Author to whom correspondence should be addressed.
Academic Editor: Shoou-Jinn Chang
Materials 2017, 10(5), 555;
Received: 11 April 2017 / Revised: 15 May 2017 / Accepted: 17 May 2017 / Published: 19 May 2017
(This article belongs to the Special Issue Selected Papers from IEEE ICASI 2017)
Surfactant films on solid surfaces have attracted much attention because of their scientific interest and applications, such as surface treatment agent, or for micro- or nano-scale templates for microfluidic devices. In this study, anionic surfactant sodium dodecyl sulfate (SDS) solutions with various charged inorganic salts was spread on a glass substrate and dried to form an SDS thin film. Atomic force microscopy (AFM) was employed to observe the micro-structure of the SDS thin film. The effects of inorganic salts on the morphology of the SDS film were observed and discussed. The results of experiments demonstrated that pure SDS film formed patterns of long, parallel, highly-ordered stripes. The existence of the inorganic salt disturbed the structure of the SDS film due to the interaction between the cationic ion and the anionic head groups of SDS. The divalent ion has greater electrostatic interaction with anionic head groups than that of the monovalent ion, and causes a gross change in the morphology of the SDS film. The height of the SDS bilayer measured was consistent with the theoretical value, and the addition of the large-sized monovalent ion would lead to lowering the height of the adsorbed structures. View Full-Text
Keywords: surfactant adsorption film; atomic force microscopy; sodium dodecyl sulfate surfactant adsorption film; atomic force microscopy; sodium dodecyl sulfate
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Shen, Z.-Y.; Lee, M.-T. On the Morphology of the SDS Film on the Surface of Borosilicate Glass. Materials 2017, 10, 555.

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