Smart surfaces with switchable superoleophilicity and superoleophobicity in aqueous media: toward controllable oil/water separation
Source abstract
Abstract
Advanced materials with surfaces that have controllable oil wettability when submerged in aqueous media have great potential for various underwater applications. Here we have developed smart surfaces on commonly used materials, including non-woven textiles and polyurethane sponges, which are able to switch between superoleophilicity and superoleophobicity in aqueous media. The smart surfaces are obtained by grafting a block copolymer, comprising blocks of pH-responsive poly(2-vinylpyridine) and oleophilic/hydrophobic polydimethylsiloxane (i.e., P2VP-b-PDMS) on these materials. The P2VP block can alter its wettability and its conformation via protonation and deprotonation in response to the pH of the aqueous media, which provides controllable and switchable access of oil by the PDMS block, resulting in the switchable surface oil wettability in the aqueous media. On the other hand, the high flexibility of the PDMS block facilitates the reversible switching of the surface oil wettability. As a proof of concept, we also demonstrate that materials functionalized with our smart surfaces can be used for highly controllable oil/water separation processes. Peng Wang and co-workers have devised smart surfaces that have switchable wettability – affinity to oil and water phases. Such materials are useful for applications that require oil/water separation, and might help clean up oil spills in future. The researchers have endowed materials with smart surfaces by decorating them with a polymer made of two flexible blocks with different properties. One block exhibits a high affinity to oil phases and low affinity to aqueous ones, while the other changes its wettability but also its shape through protonation, depending on the acidity of the aqueous phase. At different pHs, therefore, either one block or the other is predominantly exposed to the solution, endowing the surface with different wettability characteristics. These smart surfaces can be coated on commonly used materials such as textiles and sponges, and showed good properties for oil capture and release applications. Schematics showing the switchable oil wettability of the P2VP-b-PDMS-grafted surface in aqueous media with different pH.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Surface Modification and Superhydrophobicity · Advanced Sensor and Energy Harvesting Materials · Pickering emulsions and particle stabilization
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (39)
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1. Liu, M. J., Wang, S. T., Wei, Z. X., Song, Y. L. & Jiang, L. Bioinspired design of a superoleophobic and low adhesive water/solid Interface. Adv. Mater. 21, 665–669 (2009).10.1002/adma.200801782 ↗
2. Jung, Y. C. & Bhushan, B. Wetting behavior of water and oil droplets in three-phase interfaces for hydrophobicity/philicity and oleophobicity/philicity. Langmuir 25, 14165–14173 (2009).10.1021/la901906h ↗
3. Nosonovsky, M. & Bhushan, B. Multiscale effects and capillary interactions in functional biomimetic surfaces for energy conversion and green engineering. Phil. Trans. R. Soc. A 367, 1511–1539 (2009).10.1098/rsta.2009.0008 ↗
4. Lin, L., Liu, M. J., Chen, L., Chen, P. P., Ma, J., Han, D. & Jiang, L. Bio-inspired hierarchical macromolecule–nanoclay hydrogels for robust underwater superoleophobicity. Adv. Mater. 22, 4826–4830 (2010).10.1002/adma.201002192 ↗
5. Chen, L., Liu, M. J., Lin, L., Zhang, T., Ma, J., Song, Y. L. & Jiang, L. Thermal-responsive hydrogel surface: tunable wettability and adhesion to oil at the water/solid interface. Soft Matter 6, 2708–2712 (2010).10.1039/c002543g ↗
6. Huang, Y., Liu, M. J., Wang, J. X., Zhou, J. M., Wang, L. B., Song, Y. L. & Jiang, L. Controllable underwater oil-adhesion-interface films assembled from nonspherical particles. Adv. Funct. Mater. 21, 4436–4461 (2011).10.1002/adfm.201101598 ↗
7. Liu, M. J., Nie, F. Q., Wei, Z. X., Song, Y. L. & Jiang, L. In situ electrochemical switching of wetting state of oil droplet on conducting polymer films. Langmuir 26, 3993–3997 (2010).10.1021/la903392n ↗
8. Ionov, L., Houbenov, N., Sidorenko, A., Stamm, M. & Minko, S. Smart microfluidic channels. Adv. Funct. Mater. 16, 1153–1160 (2006).10.1002/adfm.200500562 ↗
9. Truman, P., Uhlmann, P., Frenzel, R. & Stamm, M. A. Stack of functional nanolayers for simultaneous emulsion separation and sensing. Adv. Mater. 21, 3601–3604 (2009).10.1002/adma.200803210 ↗
10. Schneider, M., Willaime, H., Tran, H. Y., Rezgui, F. & Tabeling, P. Wettability patterning by UV-initiated graft polymerization of poly(acrylic acid) in closed microfluidic systems of complex geometry. Anal. Chem. 82, 8848–8855 (2010).10.1021/ac101345m ↗
11. Cho, E. C., Kim, D. H. & Cho, K. Contact angles of oils on solid substrates in aqueous media: correlation with AFM data on protein adhesion. Langmuir 24, 9974–9978 (2008).10.1021/la801444q ↗
12. Chen, L., Liu, M. J., Bai, H., Chen., P. P., Xia, F., Han, D. & Jiang, L. Antiplatelet and thermally responsive poly(N-isopropylacrylamide) surface with nanoscale topography. J. Am. Chem. Soc. 131, 10467–10472 (2009).10.1021/ja9019935 ↗
13. Sheparovych, R., Motornov, M. & Minko, S. Low adhesive surfaces that adapt to changing environments. Adv. Mater. 21, 1840–1844 (2009).10.1002/adma.200802449 ↗
14. Wischerhoff, E., Uhlig, K., Lankenau, A., Börner, H. G., Laschewsky, A., Duschl, C. & Lutz, J.- F. Controlled cell adhesion on PEG-based switchable surfaces. Angew. Chem. Int. Ed. 47, 5666–5668 (2008).10.1002/anie.200801202 ↗
15. Hayes, R. A. & Feenstra, B. J. Video-speed electronic paper based on electrowetting. Nature 425, 383–385 (2003).10.1038/nature01988 ↗
16. Xue, Z. X., Wang, S. T., Lin, L., Chen, L., Liu, M. J., Feng, L. & Jiang, L. A novel superhydrophilic and underwater superoleophobic hydrogel-coated mesh for oil/water separation. Adv. Mater. 23, 4270–4273 (2011).10.1002/adma.201102616 ↗
17. Jin, M. H., Wang, J., Yao, X., Liao, M. Y., Zhao, Y. & Jiang, L. Underwater oil capture by a three-dimensional network architectured organosilane surface. Adv. Mater. 23, 2861–2864 (2011).10.1002/adma.201101048 ↗
18. Yuan, J. K., Liu, X. G., Akbulut, O., Hu, J. Q., Suib, S. L., Kong, J. & Stellacci, F. Superwetting nanowire membranes for selective absorption. Nat. Nanotech. 3, 332–336 (2008).10.1038/nnano.2008.136 ↗
19. Zhang, Y. L., Wei, S., Liu, F. J., Du, Y. C., Liu, S., Ji, Y. Y., Yokoi, T., Tatsumi, T. & Xiao, F. S. Superhydrophobic nanoporous polymers as efficient adsorbents for organic compounds. Nano. Today 4, 135–142 (2009).10.1016/j.nantod.2009.02.010 ↗
20. Cheng, M. J., Gao, Y. F., Guo, X. P., Shi, Z. Y., Chen, J. F. & Shi, F. A functionally integrated device for effective and facile oil spill cleanup. Langmuir 27, 7371–7375 (2011).10.1021/la201168j ↗
21. Rodríguez-Hernández, J., Chécot, F., Gnanou, Y. & Lecommandoux, S. Toward ‘smart’ nano-objects by self-assembly of block copolymers in solution. Prog. Polym. Sci. 30, 691–724 (2005).10.1016/j.progpolymsci.2005.04.002 ↗
22. Blanazs, A., Armes, S. P. & Ryan, A. J. Self-assembled block copolymer aggregates: from micelles to vesicles and their biological applications. Macromol. Rapid Comm. 30, 267–277 (2009).10.1002/marc.200800713 ↗
23. Luzinov, I., Minko, S. & Tsukruk, V. V. Responsive brush layers: from tailored gradients to reversibly assembled nanoparticles. Soft Matter 4, 714–725 (2008).10.1039/b718999k ↗
24. Stuart, M. A. C., Huck, W. T. S., Genzer, J., Müller, M., Ober, C., Stamm, M., Sukhorukov, G. B., Szleifer, I., Tsukruk, V. V., Urban, M., Winnik, F., Zauscher, S., Luzinov, I. & Minko, S. Emerging applications of stimuli-responsive polymer materials. Nat. Mater. 9, 101–113 (2010).10.1038/nmat2614 ↗
25. Kumar, S., Dory, Y. L., Lepage, M. & Zhao, Y. Surface-grafted stimuli-responsive block copolymer brushes for the thermo-, photo- and pH-sensitive release of dye molecules. Macromolecules 44, 7385–7393 (2011).10.1021/ma2010102 ↗
26. Motornov, M., Sheparovych, R., Katz, E. & Minko, S. Chemical gating with nanostructured responsive polymer brushes: mixed brush versus homopolymer brush. ACS Nano. 2, 41–52 (2008).10.1021/nn700214f ↗
27. Callies, M. & Quéré, D. On water repellency. Soft Matter 1, 55–61 (2005).10.1039/b501657f ↗
28. Tuteja, A., Choi, W., Ma, M. L., Mabry, J. M., Mazzella, S. A., Rutledge, G. C., McKinley, G. H. & Cohen, R. E. Designing superoleophobic surfaces. Science 318, 1618–1622 (2007).10.1126/science.1148326 ↗
29. Quéré, D. Wetting and roughness. Annu. Rev. Mater. Res. 38, 71–99 (2008).10.1146/annurev.matsci.38.060407.132434 ↗
30. Gao, L. C., McCarthy, T. J. & Zhang, X. Wetting and superhydrophobicity. Langmuir 25, 14100–14104 (2009).10.1021/la903043a ↗
31. Liu, K. S., Yao, X. & Jiang, L. Recent developments in bio-inspired special wettability. Chem. Soc. Rev. 39, 3240–3255 (2010).10.1039/b917112f ↗
32. Li, Y., Li, L. & Sun, J. Q. Bioinspired self-healing superhydrophobic coatings. Angew. Chem. Int. Ed. 49, 6129–6133 (2010).10.1002/anie.201001258 ↗
33. Motornov, M., Sheparovych, R., Lupitskyy, R., MacWilliams, E., Hoy, O., Luzinov, I. & Minko, S. Stimuli-responsive colloidal systems from mixed brush-coated nanoparticles. Adv. Funct. Mater. 17, 2307–2314 (2007).10.1002/adfm.200600934 ↗
34. Chang, S., Singamaneni, S., Kharlampieva, E., Young, S. L. & Tsukruk, V. V. Responsive hybrid nanotubes composed of block copolymer and gold nanoparticles. Macromolecules 42, 5781–5785 (2009).10.1021/ma900767s ↗
35. Fujii, S., Kameyama, S., Armes, S. P., Dupin, D., Suzaki, M. & Nakamura, Y. pH-responsive liquid marbles stabilized with poly(2-vinylpyridine) particles. Soft Matter 6, 635–640 (2010).10.1039/B914997J ↗
36. Kim, E. J., Kang, C. J., Baek, H. Y., Hwang, K. Y., Kwak, D. W., Lee, E. K., Kang, Y. J. & Thomas, E. L. Control of optical hysteresis in block copolymer photonic gels: a step towards wet photonic memory films. Adv. Funct. Mater. 20, 1728–1732 (2010).10.1002/adfm.201000329 ↗
37. Jeong, J. W., Park, W. I., Kim, M.- J., Ross, C. A. & Jung, Y. S. Highly tunable self-assembled nanostructures from a poly(2-vinylpyridine-b-dimethylsiloxane) block copolymer. Nano. Lett. 11, 4095–4101 (2011).10.1021/nl2016224 ↗
38. Bobji, M. S., Kumar, S. V., Asthana, A. & Govardhan, R. N. Underwater sustainability of the ‘Cassie’ state of wetting. Langmuir 25, 12120–12126 (2009).10.1021/la902679c ↗
39. Poetes, R., Holtzmann, K., Franze, K. & Steiner, U. Metastable underwater superhydrophobicity. Phys. Rev. Lett. 105, 166104 (2010).10.1103/PhysRevLett.105.166104 ↗