Surface gradient material: from superhydrophobicity to superhydrophilicity

Langmuir : the ACS Journal of Surfaces and Colloids
Xi YuXi Zhang

Abstract

We have developed a simple method to fabricate a gradient from superhydrophobicity to superhydrophilicity. It is based on the controlled self-assembled monolayer consisting of a thiol molecule on a gold surface and the amplifying effect of the wetting property on a rough surface. Using a relatively dilute HS(CH2)11CH3 solution (0.05 mmol/L), we found that the density of molecules on the surface can be controlled by varying the immersion time. Slowly adding the dilute solution to the container holding the rough gold substrate will lead to a density gradient along the surface. After the complementary adsorption of HS(CH2)10CH2OH, the surface exhibits a gradient from superhydrophobicity to superhydrophilicity. The slope of the gradient can be conveniently tuned by varying the speed of addition. Cassie-Baxter and Wenzel equations are employed to explain this special property based on the rough structure and the molecular composition gradient that have been determined by XPS. This kind of material would provide a larger oriented driving force for many important biological and physical processes and might have potential applications in water droplet movement, oriented axonal specification of neurons, protein adhesion, and so on.

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Citations

Aug 10, 2011·ACS Applied Materials & Interfaces·Debmita GoswamiGoutam De
Nov 3, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·Liming WangZhaohui Su
Mar 21, 2012·Langmuir : the ACS Journal of Surfaces and Colloids·Dmitriy KhatayevichMehmet Sarikaya
May 4, 2007·Chemical Communications : Chem Comm·Tie WangShaojun Dong
Jun 7, 2013·Interface Focus·Jindan WuChangyou Gao
Jan 22, 2014·ACS Applied Materials & Interfaces·Xianpeng ZhangWeijie Song
Jan 15, 2014·ACS Applied Materials & Interfaces·Guangyu ZhangZhaohui Su
Apr 5, 2014·ACS Applied Materials & Interfaces·Sudeshna RoyRabibrata Mukherjee
Jan 31, 2014·International Journal of Molecular Sciences·Hyun Hee AhnMoon Suk Kim
Jan 8, 2011·Nanoscale·Kesong Liu, Lei Jiang
Aug 19, 2010·Journal of Colloid and Interface Science·Yinmin ZhangYapu Zhao
Sep 12, 2009·Colloids and Surfaces. B, Biointerfaces·Yangjun CaiBi-min Zhang Newby
Jun 5, 2007·Journal of Colloid and Interface Science·Xiangmei Liu, Junhui He
May 14, 2014·Angewandte Chemie·Shile FengYongmei Zheng
Apr 16, 2016·Langmuir : the ACS Journal of Surfaces and Colloids·Hubert GojzewskiArkadiusz Ptak
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Aug 16, 2016·Langmuir : the ACS Journal of Surfaces and Colloids·Stephanie Hiltl, Alexander Böker
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Dec 17, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·Benhui HuYanchun Han
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Oct 30, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·Guangfen LiKarlheinz Graf
Jul 31, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·Xiaoxin ChenXi Zhang
Apr 27, 2010·Langmuir : the ACS Journal of Surfaces and Colloids·Liming WangZhaohui Su

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