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Hokkaido University Collection of Scholarly and Academic Papers >
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Hydrophobic Hydrogels with Fruit-Like Structure and Functions
| Title: | Hydrophobic Hydrogels with Fruit-Like Structure and Functions |
| Authors: | Guo, Hui Browse this author | | Nakajima, Tasuku Browse this author | | Hourdet, Dominique Browse this author | | Marcellan, Alba Browse this author | | Creton, Costantino Browse this author | | Hong, Wei Browse this author | | Kurokawa, Takayuki Browse this author | | Gong, Jian Ping Browse this author |
| Keywords: | asymmetric diffusion | | hydrophobic hydrogels | | phase separation | | seawater desalination | | semipermeable skin |
| Issue Date: | 20-Jun-2019 |
| Publisher: | Wiley-Blackwell |
| Journal Title: | Advanced Materials |
| Volume: | 31 |
| Issue: | 25 |
| Start Page: | 1900702 |
| Publisher DOI: | 10.1002/adma.201900702 |
| Abstract: | Normally, a polymer network swells in a good solvent to form a gel but the gel shrinks in a poor solvent. Here, an abnormal phenomenon is reported: some hydrophobic gels significantly swell in water, reaching water content as high as 99.6 wt%. Such abnormal swelling behaviors in the nonsolvent water are observed universally for various hydrophobic organogels containing omniphilic organic solvents that have a higher affinity to water than to the hydrophobic polymers. The formation of a semipermeable skin layer due to rapid phase separation, and the asymmetric diffusion of water molecules into the gel driven by the high osmotic pressure of the organic solvent-water mixing, are found to be the reasons. As a result, the hydrophobic hydrogels have a fruit-like structure, consisting of hydrophobic skin and water-trapped micropores, to display various unique properties, such as significantly enhanced strength, surface hydrophobicity, and antidrying, despite their extremely high water content. Furthermore, the hydrophobic hydrogels exhibit selective water absorption from concentrated saline solutions and rapid water release at a small pressure like squeezing juices from fruits. These novel functions of hydrophobic hydrogels will find promising applications, e.g., as materials that can automatically take the fresh water from seawater. |
| Rights: | This is the peer reviewed version of the following article: https://onlinelibrary.wiley.com/doi/full/10.1002/adma.201900702 , which has been published in final form at 10.1002/adma.201900702. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving. |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/78650 |
| Appears in Collections: | 生命科学院・先端生命科学研究院 (Graduate School of Life Science / Faculty of Advanced Life Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 龔 剣萍 (Gong Jian Ping)
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