Stability of plasma treated superhydrophobic surfaces under different ambient conditions

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• 作者：Faze Chen ; Jiyu Liu ; Yao Cui ; Shuai Huang ; Jinlong Song ; Jing Sun ; Wenji Xu ; Xin Liu ; ^{xinliu@dlut.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Superhydrophobic ; Superhydrophilic ; Surface modification ; Plasma ; Atmospheric pressure ; Aging
• 刊名：Journal of Colloid and Interface Science
• 出版年：2016
• 出版时间：15 May 2016
• 年：2016
• 卷：470
• 期：Complete
• 页码：221-228
• 全文大小：2179 K

文摘

Plasma hydrophilizing of superhydrophobic substrates has become an important area of research, for example, superhydrophobic-(super)hydrophilic patterned surfaces have significant practical applications such as lab-on-chip systems, cell adhesion, and control of liquid transport. However, the stability of plasma-induced hydrophilicity is always considered as a key issue since the wettability tends to revert back to the untreated state (i.e. aging behavior). This paper focuses on the stability of plasma treated superhydrophobic surface under different ambient conditions (e.g. temperature and relative humidity). Water contact angle measurement and X-ray photoelectron spectroscopy are used to monitor the aging process. Results show that low temperature and low relative humidity are favorable to retard the aging process and that pre-storage at low temperature (−10 °C) disables the treated surface to recover superhydrophobicity. When the aging is performed in water, a long-lasting hydropholicity is obtained. As the stability of plasma-induced hydrophilcity over a desired period of time is a very important issue, this work will contribute to the optimization of storage conditions of plasma treated superhydrophobic surfaces.