Modulation of Hydrophobic Interaction by Mediating Surface Nanoscale Structure and Chemistry, not Monotonically by Hydrophobicity

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 q...

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Bibliographic Details
Published in:Angewandte Chemie 2018-09, Vol.130 (37), p.12079-12084
Main Authors: Cui, Xin, Liu, Jing, Xie, Lei, Huang, Jun, Liu, Qi, Israelachvili, Jacob N., Zeng, Hongbo
Format: Article
Language:English
Subjects:
Air bubbles
Atomic force microscopy
Blasen-AFM
Chemistry
Colloiding
Contact angle
Heterogeneity
Hydrophobe Wechselwirkungen
Hydrophobicity
Interaction parameters
Microscopy
Oberflächenchemie
Oberflächenkräfte
Organic chemistry
Selbstorganisierte Monoschichten
Surface chemistry
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Summary: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. Blasen‐AFM und eine theoretische Analyse geben Einblick in hydrophobe Wechselwirkungen von Luftblasen mit selbstorganisierten Alkanthiol‐Monoschichten und ölgetränkten porösen Oberflächen. Inwieweit hydrophobe Wechselwirkungen auftreten, hängt stark vom strukturierenden Effekt auf das Wasser ab. Dieser ließ sich effektiv über die nanoskalige Struktur und chemische Beschaffenheit der Oberfläche modulieren.
ISSN:0044-8249
1521-3757
DOI:10.1002/ange.201805137