Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 57, Issue 37, Pages 11903-11908Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201805137
Keywords
bubble-probe AFM; hydrophobic interactions; surface chemistry; surface forces; self-assembled monolayers
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Funding
- National Sciences and Engineering Research Council of Canada (NSERC)
- Canada Foundation for Innovation (CFI)
- Alberta Advanced Education AMP
- Technology Small Equipment Grants Program (AET/SEGP)
- Canada Research Chairs Program
- Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering [DE-FG02-87ER-45331]
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The hydrophobic (HB) interaction plays a critical role in many colloidal and interfacial phenomena, biophysical and industrial processes. Surface hydrophobicity, characterized by the water contact angle, is generally considered the most dominant parameter determining the HB interaction. Herein, we quantified the HB interactions between air bubbles and a series of hydrophobic surfaces with different nanoscale structures and surface chemistry in aqueous media using a bubble probe atomic force microscopy (AFM). Surprisingly, it is discovered that surfaces of similar hydrophobicity can show different ranges of HB interactions, while surfaces of different hydrophobicity can have similar ranges of HB interaction. The increased heterogeneity of the surface nanoscale structure and chemistry can effectively decrease the decay length of HB interaction from 1.60 nm to 0.35 nm. Our work provides insights into the physical mechanism of HB interaction.
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