4.7 Article

Anti-Fouling Performance of Hydrophobic Hydrogels with Unique Surface Hydrophobicity and Nanoarchitectonics

期刊

GELS
卷 8, 期 7, 页码 -

出版社

MDPI
DOI: 10.3390/gels8070407

关键词

water content; hydrophobic hydrogels; surface hydrophobicity; anti-fouling

资金

  1. National Natural Science Foundation of China [51903253]
  2. Natural Science Foundation of Guangdong Province of China [2019A1515011150]
  3. Science and Technology Development Fund of Macao [FDCT 0009/2019/A, 0083/2019/A2, 0009/2020/AMJ]
  4. Guangzhou Municipal Science and Technology Project [20210202075]

向作者/读者索取更多资源

Recently invented hydrophobic hydrogels exhibit excellent anti-fouling ability, which is mainly attributed to their surface hydrophobicity, while excessive water content might be detrimental.
Hydrogel is a kind of soft and wet matter, which demonstrates favorable fouling resistance owing to the hydration anti-adhesive surfaces. Different from conventional hydrogels constructed by hydrophilic or amphiphilic polymers, the recently invented hydrophobic hydrogels composed of hydrophobic polymers exhibit many unique properties, e.g., surface hydrophobicity and high water content, suggesting promising applications in anti-fouling. In this paper, a series of hydrophobic hydrogels were prepared with different chemical structures and water content for anti-fouling investigations. The hydrophobic hydrogels showed high static water contact angles (WCAs > 90 degrees), indicating remarkable surface hydrophobicity, which is abnormal for conventional hydrogels. Compared with the conventional hydrogels, all the hydrophobic hydrogels exhibited less than 4% E. coli biofilm coverage, showing a contrary trend of anti-fouling ability to the water content inside the polymer. Typically, the poly(2-(2-ethoxyethoxy)ethyl acrylate) (PCBA) and poly(tetrahydrofurfuryl acrylate) (PTHFA) hydrogels with relatively high surface hydrophobicity showed as low as 5.1% and 2.4% E. coli biofilm coverage even after incubation for 7 days in bacteria suspension, which are about 0.32 and 0.15 times of that on the hydrophilic poly(N,N-dimethylacrylamide) (PDMA) hydrogels, respectively. Moreover, the hydrophobic hydrogels exhibited a similar anti-adhesion ability and trend to algae S. platensis. Based on the results, the surface hydrophobicity mainly contributes to the excellent anti-fouling ability of hydrophobic hydrogels. In the meantime, the too-high water content may be somehow detrimental to anti-fouling performance.

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