Journal
JOURNAL OF PHYSICAL CHEMISTRY B
Volume 121, Issue 14, Pages 3151-3161Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcb.7b00828
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Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Canada Foundation for Innovation
- China Opportunity Fund/Joint Research Lab Program (University of Alberta)
- Alberta Innovates Technology Futures (AITF) Graduate Student Scholarship
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Surface functionalization by alkylsilanes has been widely used in many engineering applications. In this work, a systematic investigation was conducted on the deposition behaviors of octadecyltrichlorosilane (OTCS) on freshly cleaved mica surfaces that possess a low density of reactive sites (i.e., silanol groups) by a vapor-deposition method. The deposition of OTCS molecules on 15 mica was found to follow a two-stage process, as monitored by measuring the surface morphology using an atomic force micro- scope and wettability of the samples obtained at different deposition times. The contact mechanics behaviors and interaction forces of Approaching Separation the as-obtained OTCS surfaces were characterized using a surface , forces apparatus. The contact mechanics tests demonstrate that the OTCS coatings can significantly reduce the surface adhesion and adhesion hysteresis in air. The force-distance profiles of the OTCS surfaces obtained via a shorter deposition time (e.g., 2, 8 h) in aqueous solutions could be reasonably described by the classical Derjaguin-Landau-Verwey-Overbeek theory. However, for the OTCS surfaces obtained by longer deposition times (e.g., 48 h), hydrophobic interaction and steric interaction play an important role due to the enhanced surface hydrophobicity and roughness. Our results provide useful insights into the physicochemical characteristics of alkylsilane deposition and the surface interaction mechanisms of deposited alkylsilanes at solid-air and solid-water interfaces.
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