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説明:

Ultrathin foam films can be prepared from numerous compounds under a wide range of conditions but have a narrow application scope because of their small size, susceptibility to rupture, and other drawbacks arising from low mechanical stability of the bilayer structure. To address this gap, we herein prepared ultrathin foam films of gelatin using a facile method via drying thin liquid films of aqueous gelatin solutions and the gelation. Their thickness ranges between nanometers to micrometers in response to changes in process parameters. The effects of various process parameters, including the solution concentration, frame size, drying temperature, and humidity, were systematically investigated. In addition to surface tension affecting the initial formation of the liquid film, the high viscosity of the solutions stabilized the film and caused gelation. The key formation factor of the dried foam films was explained by the sol–gel behavior of aqueous gelatin solutions. The prepared films are mechanically more stable than surfactant films and therefore have a wide range of potential applications as separation membranes. Glutaraldehyde cross-linking makes these films water-insoluble and therefore suitable for use as a nanoseparation membrane. Fully cross-linked gelatin thin films showed a rejection performance of 100% for 5 and 2 nm gold colloids, Direct Yellow 1, and potassium ferricyanide.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: gelatin, thermal gelation, sol–gel behavior, free-standing thin film, foam film, separation membranes

刊行年月日: 2025-10-28

出版者: American Chemical Society (ACS)

掲載誌:

• LANGMUIR (ISSN: 15205827) vol. 41 issue. 42 p. 28637-28645

研究助成金:

• Nippon Sheet Glass Foundation for Materials Science and Engineering
• Japan Society for the Promotion of Science 21H02006
• Japan Society for the Promotion of Science 23K23417
• Council for Science, Technology and Innovation JPJ009237

原稿種別: 著者最終稿 (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.5981

公開URL: https://doi.org/10.1021/acs.langmuir.5c03893

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更新時刻: 2025-12-10 08:30:36 +0900

MDRでの公開時刻: 2025-12-10 08:23:47 +0900