Hui Liu,Li Zhang,Jianying Huang,Xiaoli Zhang,Jiajun Mao,Zhong Chen,Qinghui Mao,Mingzheng Ge,Yuekun Lai
Superwetting materials with multiple functions have drawn heightened attention due to their delicately adjustable surface wettability . However, realizing the full potential of diversified functions is often hampered by the usually symmetrical wetting state. Herein, we introduce a versatile electro-spraying technique to construct a patterned PDMS/PMMA coating with asymmetrical wettability. The tunable superwetting patterns are able to achieve the required functional diversity. The as-prepared superhydrophobic fabric can act as a separation filter with a high separation efficiency and satisfactory cycling ability. With the wettability difference, such patterned surfaces can also manipulate the successive drops motions, and relation between the surface patterns and the controllable movement is demonstrated. In addition, the patterned surface can serve as a smart signal-expression membrane, thereby enabling real-time variable liquid signal expression with alterable signals. The exciting results have paved the way for expanding the application foreground of smart superwetting materials in microfluidics and signal-detection.
Hui Liu,Jianying Huang,Zhong Chen,Guoqiang Chen,Ke-Qin Zhang,Salem S. Al-Deyab,Yuekun Lai
In this work, a translucent superhydrophobic coating was fabricated by a simple spray-coating technique using fluorine-free and easily available materials, viz , the hybrids of PDMS and PMMA in THF solution, without any pre-/post-treatment. The combination of the microscale roughness of the sprayed-PMMA, along with the low surface energy PDMS, has contributed to the observed superhydrophobicity. The as-prepared PDMS/PMMA@superhydrophobic surface has displayed a water contact angle of 157.5° and sliding angle of 2.8°. Furthermore, the liquids with various surface tension, ranging from water to various organic liquids, displayed nearly spherical shapes on the superhydrophobic substrate. In addition, this coating has also shown significant stability against sand abrasion and water droplet impact, and was able to maintain its superhydrophobicity after being soaked in strong acid and salkali solutions. Moreover, the superhydrophobic coating was found to be translucent with good visibility of the characters through the coated glass substrate. The transformation from a superhydrophobic state to superhydrophilic state can be realized via a hot-press process, and such a facile technique can be easily applied to potential applications in surface patterning. Additionally, the super-antiwetting surface has been demonstrated for applications in highly efficient oil-water emulsion separation, anti-fouling, and self-cleaning.
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