Ultrafast Oleophobic–Hydrophilic Switching Surfaces for Antifogging, Self-Cleaning, and Oil–Water Separation

Abstract

. (2014) 'Ultra-fast oleophobic-hydrophilic switching surfaces for anti-fogging, self-cleaning, and oil-water separation.', ACS applied materials interfaces., 6 (10). pp. 7504-7511.Further information on publisher's website:http://dx.doi.org/10.1021/am500882yPublisher's copyright statement:This document is the Accepted Manuscript version of a Published Work that appeared in nal form in ACS Applied Materials Interfaces, copyright c American Chemical Society after peer review and technical editing by the publisher. To access the nal edited and published work see http://pubs.acs.org/doi/abs/10.1021/am500882y. Additional information:Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. be further enhanced by the incorporation of surface roughness to an extent that it reaches a sufficiently high level (water contact angle <10° and hexadecane contact angle >110°) which, when combined with the inherent ultra-fast switching speed, yields oil-water mixture separation efficiencies exceeding 98%.

Highly Polar Linkers (Urea, Carbamate, Thiocarbamate) for Superoleophobic/Superhydrophobic or Oleophobic/Hydrophilic Properties

“…Surprisingly, it is also possible to have oil contact angles higher than water contact angles using urea linkers (NHCONH), which is rare in the literature. [27][28][29][30][31][32][33][34][35] In all the examples reported in the literature, there is the presence of both highly oleophobic parts such as fl uorinated materials and highly hydrophilic parts such as charged or highly polar species. For example, the group of Zhang reported the preparation of superhydrophilic/superoleophobic (in air) by mixing poly(diallyldimethylammonium chloride) (PDDA) with sodium perfl uorooctanoate (PFO).…”

“…Here, we show also that some of these monomers can lead to both hydrophilic and oleophobic properties. This unusual surface property is rare in the literature [27][28][29][30][31][32][33][34][35] but possible by combining hydrophilic and oleophobic materials, and can found other applications in oil/water separation, [36][37][38] for example.…”

Tailoring surface charge and wetting property for robust oil-fouling mitigation in membrane distillation

“…The underwater oleophobicity is to be distinguished from the in-air oleophobicity which stands for resistance to oil adhesion in air. Inspired by biological surfaces such as sharkskin and clamshells that are resistant to biological or organic adhesion underwater, the materials science community has developed a plethora of interfacial materials with underwater superoleophobicity for different applications such as marine biofouling control [21,22] and oil-water separations [23][24][25][26][27][28][29][30][31][32][33]. In general, there are two requirements for constructing an underwater superoleophobic surface: rough (textured) surface morphology and hydrophilic surface chemistry.…”

Designing bioinspired superoleophobic surfaces

“…However, it is possible to create a coating that repels oils but attracts water. [58][59][60][61][62][63] This can be achieved through the use of a fluorosurfactant, which contains a high surface energy head group and a low surface energy tail group. Fluorosurfactants are typically used as additives in paints or cleaners, however, the presence of the ionic head group common in many examples allows for them to become complexed, either in solution or on a coating, with electrolyte-containing polymers.…”