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Electric Potential-Controlled Interfacial Interaction between Gold and Hydrophilic/Hydrophobic Surfaces in Aqueous Solutions
时间:2022-01-18 13:11:07
作品信息

期刊

The Journal of Physical Chemistry C

标题

Electric Potential-Controlled Interfacial Interaction between Gold and Hydrophilic/Hydrophobic Surfaces in Aqueous Solutions

作者

Shaowei Li, Pengpeng Bai, Yuanzhe Li, Changfeng Chen, Yonggang Meng, and Yu Tian

摘要

The ability to regulate the interaction between gold and hydrophilic/hydrophobic surfaces with an external electric field is of great theoretical and practical value for biotechnological applications such as cell recognition and targeted drug delivery. This study explores the interfacial interaction between colloidal probes with different wetting properties and gold surfaces as a function of the electrochemical potential. A three-electrode system is used to control the electrical potential of the gold surface. When a hydrophilic silicon oxide (SiO2) microsphere contacts the gold surface, the interfacial adhesion strengthens with an increase in the applied potential. However, when a hydrophobic polystyrene (PS) microsphere contacts the gold surface, the adhesive force remains almost zero at all potentials. This result is attributed to differences in the potential-dependent interfacial affinity of the Au surface to microspheres of different chemical natures and hence wetting properties. Specifically, the dangling hydroxyl groups present at the Au/electrolyte interface resulting from the increased potential are capable of hydrogen bonding with hydrophilic SiO2 microspheres. However, in the absence of active hydroxyl groups on the hydrophobic PS surface, hydrogen bonding with the gold surface is not possible. This principle is universal in interfacial interactions and it provides further understanding of the interfacial interactions between charged metal surfaces and hydrophilic/hydrophobic colloidal particles and might inspire the development of more effective methods for biotechnologies involving the interfacial adhesions of biomaterials.

原文链接

https://pubs.acs.org/doi/10.1021/acs.jpcc.8b06755

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