Temperature Controlled Water/Oil Wettability of a Surface Fabricated by a Block Copolymer: Application as a Dual Water/Oil On–Off Switch

Xue, Baolong; Gao, Longcheng; Hou, Yongping; Liu, Zhiwen; Jiang, Lei

doi:10.1002/adma.201202799

Cited by 212 publications

(129 citation statements)

References 28 publications

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“…The switch of hydrogen bonding from intermolecular hydrogen bonds (between the microgel's amide groups and water) to intramolecular hydrogen bonds (C=O and N-H groups) explains the observed volumetric and morphological transition. 15 The accompanying change in wettability of the pores from hydrophilicity to hydrophobicity after being treated at 47℃ is enabled by the dense coverage of microgels on the pore walls.…”

Section: Discussionmentioning

confidence: 99%

“…[1][2][3] Introducing responsive polymers on patterned surfaces with regular micro-, nano-or molecular-scale morphologies can create active patterned polymer surfaces (APPS) that have diverse proposed applications, including self-cleaning and water-resistant devices, [4][5] electro-wetting devices, [6][7][8] switching wettability surfaces [9][10][11][12][13][14] or water/ oil purification films. 15 Routes to APPS include physical or chemical modification of surfaces. Physical methods normally include procedures involving electrical fields, [16][17][18][19] self-assembly of nanoparticles, [20][21][22][23][24][25] interfacial instabilities, [26][27][28][29][30] soft lithography, [31][32][33][34] etc.…”

Section: Introductionmentioning

confidence: 99%

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Fabrication of Active Surfaces with Metastable Microgel Layers Formed during Breath Figure Templating

Zhou¹,

Huang²,

Sun³

et al. 2017

ACS Appl. Mater. Interfaces

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Patterned porous surfaces with responsive functionalities are fabricated by a thermoresponsive microgel-assisted breath figure (BF) process. When water droplets submerge into a polystyrene (PS) solution during formation of a porous surface by the bottom-up BF process, poly(N-isopropylacrylamide)-co-acrylic acid (PNIPAm-co-AA) microgels dispersed in the solution spontaneously assemble at the water–organic interfaces like “Pickering emulsions”, reinforced by capillary flow. The conformal layer of PNIPAm-co-AA microgels lining the pores appears in images from a scanning electron microscope (SEM) either as a smooth surface layer (L) or as an array of domelike protrusions (D), depending on the conditions at which the sample was dried for SEM. The change between L and D morphology correlates with the volume phase transition behavior of the microgels freely suspended: drying at a temperature below the volume phase transition temperature (VPTT) gives L, and the D morphology is formed by drying at a temperature greater than the VPTT of PNIPAm-co-AA microgels. The morphological transition is shown to accompany a significant change in surface contact angle (CA) relative to a corresponding pore layer made of PS, with L having a CA that is reduced by 85° relative to PS, while the decrease is only 22° for D. Porous structures with morphologically responsive surfaces could find application in biocatalysis or tissue engineering, for example, with functional enzymes sequestered when microgels are collaped and accessible when the microgels are swollen.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fabrication of Active Surfaces with Metastable Microgel Layers Formed during Breath Figure Templating

Zhou¹,

Huang²,

Sun³

et al. 2017

ACS Appl. Mater. Interfaces

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“…[153] Xue et al achieved temperature-controlled water/oil wettability switching for selective permeation through a block copolymer using a PNIPAAm-coated mesh membrane. [154] Other thermoresponsive membrane composites containing PNIPAAm have also been used to efficiently separate oil-water mixtures and even oil-in-water and W/O emulsions. [155,156] In addition, thermoresponsive melamine sponges containing PNIPAAm can effectively absorb and release oil under water with alternative high and low temperature, respectively, which has potential for smart oil/water separation.…”

Section: Thermoresponsive Surfaces 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

103

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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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“…Designing a solid surface with specific surface characteristics, such as wetting properties, mechanical resistance, anticorrosion properties, etc., is challenging in several applications in aerospace, marine, biomedicine etc 1,2 . Therefore, the surface modification of engineering metallic materials, such as the most commonly used austenitic stainless steel (AISI), 3,4 by various coatings represents an important subject in the field of enhancing particular surface properties, mechanical as well as anticorrosion properties.…”

Section: Introductionmentioning

confidence: 99%

Comparison of the surface and anticorrosion properties of SiO2 and TiO2 nanoparticle epoxy coatings

Conradi¹,

Kocijan²

2017

Mater. Tehnol.

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In this article we compare the morphology, wetting and anticorrosion properties of fluorosilane-modified TiO2, FAS-TiO2/epoxy and SiO2, FAS-SiO2/epoxy coatings. Thirty-nanometre TiO2 and SiO2 nanoparticles were spin coated onto the AISI 316L steel substrate and covered with a thin epoxy layer for nanoparticle fixation. The morphology of the coatings was analysed with SEM imaging and the average surface roughness (Sa), and it showed a homogeneous FAS-TiO2 nanoparticle distribution in the coating, whereas the FAS-SiO2 nanoparticles tended to agglomerate. Static water contact angles were measured to evaluate the wetting properties, indicating the highly hydrophobic nature of both coatings. Potentiodynamic measurements showed that the addition of nanoparticles to the epoxy coating significantly improved the corrosion resistance of the AISI 316L stainless steel. Keywords: TiO2, SiO2, epoxy, coatings, wetting, corrosion V~lanku primerjamo morfologijo, omo~itvene lastnosti in antikorozijske lastnosti s fluorosilanom oble~enih TiO2, FAS-TiO2/ epoksi in SiO2, FAS-SiO2/epoxy prevlek. 30-nm TiO2 in SiO2 nanodelce smo na jekleno podlago tipa AISI 316L nanesli s "spin coaterjem" ter jih prekrili s tanko plastjo epoksidne smole, ki je zagotovila fiksacijo nanodelcev na povr{ini. Morfolo{ke lastnosti prevlek smo analizirali s SEM mikroskopijo ter z meritvami povpre~ne hrapavosti povr{ine (Sa). Pokazali smo, da so FAS-TiO2 nanodelci v prevleki enakomerno razporejeni, medtem, ko FAS-SiO2 nanodelci ka`ejo visoko stopnjo aglomeracije. Omo~itvene lastnosti prevlek smo dolo~ili z meritvami stati~nih kontaktnih kotov, ki so pokazale hidrofobne lastnosti tako FAS-TiO2/epoksi kot tudi FAS-SiO2/epoksi prevlek. Potenciodinamske meritve potrjujejo, da z dodatkom nanodelcev epoksi, za{~itnim prevlekam izrazito izbolj{amo korozijsko obstojnost nerjavnega jekla AISI 316L.

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Temperature Controlled Water/Oil Wettability of a Surface Fabricated by a Block Copolymer: Application as a Dual Water/Oil On–Off Switch

Cited by 212 publications

References 28 publications

Fabrication of Active Surfaces with Metastable Microgel Layers Formed during Breath Figure Templating

Fabrication of Active Surfaces with Metastable Microgel Layers Formed during Breath Figure Templating

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

Comparison of the surface and anticorrosion properties of SiO2 and TiO2 nanoparticle epoxy coatings

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