Photo-induced water–oil separation based on switchable superhydrophobicity–superhydrophilicity and underwater superoleophobicity of the aligned ZnO nanorod array-coated mesh films

Tian, Dongliang; Zhang, Xiaofang; Tian, Yu; Wu, Yue; Wang, Xiao; Zhai, Jin; Jiang, Lei

doi:10.1039/c2jm34056a

Cited by 351 publications

(239 citation statements)

References 68 publications

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“…3,4,5,6,7,8 Existing methods for the removal or collection of oils from an oil-water mixture utilise absorbent materials 9 such as zeolites, 10,11 organoclays, 12 non-woven polypropylene, 13,14 or natural fibres 15 (such as straw, 16 cellulose, 14 or wool 17 ).…”

Section: Introductionmentioning

confidence: 99%

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

Brown

Atkinson

Badyal

2014

ACS Appl. Mater. Interfaces

148

123

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. (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%.

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Section: Introductionmentioning

confidence: 99%

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

Brown

Atkinson

Badyal

2014

ACS Appl. Mater. Interfaces

148

123

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“…22,23,25 Various preparation methods such as layer-by-layer coating, polymerization, sol gel method, hydrothermal treatments, direct oxidation, and chemical vapor deposition, have been employed, and various materials such as hydrogel, silicate, TiO 2 , silica gel, zeolite and nanostructured ZnO surfaces, have been studied in order to achieve superhydrophilic surface with good underwater oil repellency. 22−27 However, most of these preparation methods involve multiple processes, long and delicate methods of sample preparation, exotic materials, and extreme physical conditions to achieve a surface with such wetting properties.…”

mentioning

confidence: 99%

Study of Factors Governing Oil–Water Separation Process Using TiO₂ Films Prepared by Spray Deposition of Nanoparticle Dispersions

Gondal

Sadullah

Dastageer

et al. 2014

ACS Appl. Mater. Interfaces

219

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Surfaces which possess extraordinary water attraction or repellency depend on surface energy, surface chemistry and nano-and microscale surface roughness. Synergistic superhydrophilic-underwater superoleophobic surfaces were fabricated by a spray deposition of nanostructured TiO 2 on stainless steel mesh substrates. The coated meshes were then used to study gravity driven oil-water separation, where only the water from the oil-water mixture is allowed to permeate through the mesh. Oil-water separation efficiencies of up to 99 % could be achieved through the coated mesh of pore sizes 50 and 100 micron, compared to no separation at all, that was observed in the case of uncoated meshes of the same material and pore sizes. An adsorbed water on the TiO 2 coated surface, formation of a water-film between 2 the wires that form the mesh and the underwater superoleophobicity of the structured surface are the key factors that contribute to the enhanced efficiency observed in oil-water separation.The nature of the oil-water separation process using this coated mesh (in which the mesh allows water to pass through the porous structure but resists wetting by the oil phase) minimizes the fouling of mesh so that the need for frequent replacement of the separating medium is reduced. This fabrication approach presented here can be applied for coating large surface areas and to develop a large-scale oil water separation facility for oil-field applications and petroleum industries.

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“…[64] Accordingly, photoresponsive oil-water separation can be achieved on the ZnO-nanoarray-coated mesh, indicating on-demand remote control of oil-water separation (Figure 8). [132] During the photoresponsive process, the separation mode changes from oil removal to water removal, which can effectively prevent oil pollution of the mesh film. Yan et al subsequently reported similar on-demand photoinduced oil/ water separation based on the switchable wettability of the mesh between superhydrophobic and superhydrophilic/underwater superoleophobic by alternative UV illumination and heat treatment.…”

Section: Photoinduced Selective Permeation For Separationmentioning

confidence: 99%

External‐Field‐Induced Gradient Wetting for Controllable Liquid Transport: From Movement on the Surface to Penetration into the Surface

Zhang

et al. 2017

Advanced Materials

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External‐field‐responsive liquid transport has received extensive research interest owing to its important applications in microfluidic devices, biological medical, liquid printing, separation, and so forth. To realize different levels of liquid transport on surfaces, the balance of the dynamic competing processes of gradient wetting and dewetting should be controlled to achieve good directionality, confined range, and selectivity of liquid wetting. Here, the recent progress in external‐field‐induced gradient wetting is summarized for controllable liquid transport from movement on the surface to penetration into the surface, particularly for liquid motion on, patterned wetting into, and permeation through films on superwetting surfaces with external field cooperation (e.g., light, electric fields, magnetic fields, temperature, pH, gas, solvent, and their combinations). The selected topics of external‐field‐induced liquid transport on the different levels of surfaces include directional liquid motion on the surface based on the wettability gradient under an external field, partial entry of a liquid into the surface to achieve patterned surface wettability for printing, and liquid‐selective permeation of the film for separation. The future prospects of external‐field‐responsive liquid transport are also discussed.

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Photo-induced water–oil separation based on switchable superhydrophobicity–superhydrophilicity and underwater superoleophobicity of the aligned ZnO nanorod array-coated mesh films

Cited by 351 publications

References 68 publications

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

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

Study of Factors Governing Oil–Water Separation Process Using TiO₂ Films Prepared by Spray Deposition of Nanoparticle Dispersions

External‐Field‐Induced Gradient Wetting for Controllable Liquid Transport: From Movement on the Surface to Penetration into the Surface

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Photo-induced water–oil separation based on switchable superhydrophobicity–superhydrophilicity and underwater superoleophobicity of the aligned ZnO nanorod array-coated mesh films

Cited by 351 publications

References 68 publications

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

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

Study of Factors Governing Oil–Water Separation Process Using TiO2 Films Prepared by Spray Deposition of Nanoparticle Dispersions

External‐Field‐Induced Gradient Wetting for Controllable Liquid Transport: From Movement on the Surface to Penetration into the Surface

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Study of Factors Governing Oil–Water Separation Process Using TiO₂ Films Prepared by Spray Deposition of Nanoparticle Dispersions