Superhydrophilicity superhydrophobicity

Wang S, Liu H, Liu D, Ma X, Fang X, Jiang L. (2007) Enthalpy driven three state switching of a superhydrophilic/superhydrophobic surface. Angew Chem Int EdA6-. 3915—3917. 

Kang, C., Lu, H.,Yuan, S., Hong, D.,Yan, K., Liang, B., 2012. Superhydrophilicity/superhydrophobicity of nickel micro-arrays fabricated by electroless deposition on an etched porous aluminum template. Chem. Eng.J. 203, 1. 

Zahner, D., Abagat.J., Svec, F., Frechet,J.M.J., Levkin, P.A., 2011. A facile approach to superhydrophilic-superhydrophobic patterns in porous polymer films. Adv. Mater. 23,3030. Zhang, F, Chen, S., Dong, L., Lei,Y, Liu, T, Yin, Y, 2011. Preparation of superhydrophobic films on titanium as effective corrosion barriers. Appl. Surf. Sci. 257,2587. 

Sun T, Wang G, Feng L et al (2004) Reversible Switching between superhydrophilicity and superhydrophobicity. Angew Chem Int Ed 43 357-360... 

Superhydrophilic and superhydrophobic surfaces are more effective at stabilizing two-phase microflows. These surfaces can be obtained by creating roughness utilizing titanium nanoparticles. Titanium modification of a microchannel yields nanometer-scale surface roughness, and subsequent... 

Xia F, Feng L, Wang ST, Sun TL, Song WL, Jiang WH, et al. Dual-responsive surfaces that switch superhydrophilicity and superhydrophobicity. Adv Mater 2006 18(4) 432—6. 

Stratakis E, Mateescu A, Barberoglou M, Vamvakaki M, Fotakis C, Anastasiadis SH. From superhydrophobicity and water repellency to superhydrophilicity smart polymer-functionalized surfaces. Chem Commun 2010 46(23) 4136—8. 

The experiment indicates that, in principle, this technique could be used to create a full length wettability gradient from superhydrophobic to superhydrophilic on a single substrate which, to our knowledge, has been rarely achieved so far [38-40],... 

Based on colloidal monolayers of polystyrene spheres, we have prepared various two-dimensional nano-structured arrays by solution routes and electrodeposition. Many ordered structured arrays generated using these methods are of surface roughness on the nano- and micro-scales, and could be superhydrophobic or superhydrophilic. The nano-devices based on such nano-structured arrays would be waterproof and selfcleaning, in addition to their special device functions. In this article, taking silica, ZnO and gold as examples of the insulators, semiconductors and metals, respectively, we report some of our recent results to demonstrate controlled wettability and superhydrophobicity of two-dimensional ordered nano-stmctured arrays with centimeter square-size based on colloidal monolayers. 

According to Wenzel s equation, obviously, high roughness can enhance the hydrophilicity of a native hydrophilic surface. In our study, such porous film is much rougher than relatively flat surface obtained without using template, so this model can explain why our as-synthesized films show superhydrophilicity with a CA about 5°. After modification with a lower surface free energy material, the air can be trapped in such ordered pore array, and hence a composite surface composed of air and pore array is formed. The measurements show that the surface is superhydrophobic with water CA of 154°. In this case, the Cassie equation is applicable. Based on a simplified model, as schematically illustrated in Fig. 6, the relationship... 

Dorrer C, Ruhe J (2007) Wetting of silicon nanograss from superhydrophilic to superhydrophobic surfaces. Adv Mater 20(1) 159-163... 

Wetting H-terminated wires superhydrophobic (>135°) Oxidized wires are superhydrophilic (<5°) Contact-angle dependence on wire density, diameter, length Surface coatings Wang et al. (2012)... 

In this chapter, recent developments on different polymer surfaces with superwettability will be introduced. As mentioned above, the super-wettability on a solid surface is not solely determined by the chemical composition of that surface, but is also a result of some roughness arrangement. Theoretically speaking, all polymers can be either made superhydrophilic or superhydrophobic with the help of proper surface structures. As a result, it is... 

As mentioned above, the superhydrophobic-material-based oil/water separation device faces the practical issue that water is usually heavier than oil, which limits the productivity during the separation process. It is thus rational to develop a separation device on the basis of superhydrophilic materials. Among all the superhydrophilic materials, hydrogels exhibit the most robust underwater superoleophobicity and therefore, they are the most ideal candidates for such separation systems. 

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