TY - JOUR
T1 - A Fluorine-free Slippery Surface with Hot Water Repellency and Improved Stability against Boiling
AU - Togasawa, Ryo
AU - Tenjimbayashi, Mizuki
AU - Matsubayashi, Takeshi
AU - Moriya, Takeo
AU - Manabe, Kengo
AU - Shiratori, Seimei
N1 - Funding Information:
We are deeply grateful to Dr. Kouji Fujimoto, whose meticulous comments were of enormous help. We also thank Ryohei Yoshikawa for providing impressive schemes. We express our sincere gratitude to Professor Walter Navarrini at Politecnico di Milano and Professors Nicole Zacharia and Bryan Vogt at The University of Akron for useful discussions. We thank the Daiwa Can Company for their assistance in evaporation residue measurements. M.T. thanks the Japan Society for Promotion of Science (JSPS) for a predoctoral fellowship (DC1).
Funding Information:
*E-mail shiratori@appi.keio.ac.jp. ORCID Mizuki Tenjimbayashi: 0000-0002-8107-8285 Kengo Manabe: 0000-0002-8601-8003 Seimei Shiratori: 0000-0001-9807-3555 Author Contributions R.T. proposed the research, designed the experiments, and collected and analyzed the data. R.T., M.T., T.Matsubayashi, and T. Moriya collected the data. R.T. wrote the paper. M.T., T.Matsubayashi, and K.M. commented on the manuscript. S.S. supervised the project. All authors discussed the data and substantially contributed to the research. Funding This work was supported by JSPS KAKENHI (Grant JP16J06070, JP26420710). Notes The authors declare no competing financial interest.
PY - 2018/1/31
Y1 - 2018/1/31
N2 - Inspired by natural living things such as lotus leaves and pitcher plants, researchers have developed many excellent antifouling coatings. In particular, hot-water-repellent surfaces have received much attention in recent years because of their wide range of applications. However, coatings with stability against boiling in hot water have not been achieved yet. Long-chain perfluorinated materials, which are often used for liquid-repellent coatings owing to their low surface energy, hinder the potential application of antifouling coatings in food containers. Herein, we design a fluorine-free slippery surface that immobilizes a biocompatible lubricant layer on a phenyl-group-modified smooth solid surface through OH-π interactions. The smooth base layer was fabricated by modification of phenyltriethoxysilane through a sol-gel method. The π-electrons of the phenyl groups interact with the carboxyl group of the oleic acid used as a lubricant, which facilitates immobilization on the base layer. Water droplets slid off the surface in the temperature range from 20 to 80 °C at very low sliding angles (<2°). Furthermore, we increased the π-electron density in the base layer to strengthen the OH-π interactions, which improved long-term boiling stability under hot water. We believe that this surface will be applied in fields in which the practical use of antifouling coatings is desirable, such as food containers, drink cans, and glassware.
AB - Inspired by natural living things such as lotus leaves and pitcher plants, researchers have developed many excellent antifouling coatings. In particular, hot-water-repellent surfaces have received much attention in recent years because of their wide range of applications. However, coatings with stability against boiling in hot water have not been achieved yet. Long-chain perfluorinated materials, which are often used for liquid-repellent coatings owing to their low surface energy, hinder the potential application of antifouling coatings in food containers. Herein, we design a fluorine-free slippery surface that immobilizes a biocompatible lubricant layer on a phenyl-group-modified smooth solid surface through OH-π interactions. The smooth base layer was fabricated by modification of phenyltriethoxysilane through a sol-gel method. The π-electrons of the phenyl groups interact with the carboxyl group of the oleic acid used as a lubricant, which facilitates immobilization on the base layer. Water droplets slid off the surface in the temperature range from 20 to 80 °C at very low sliding angles (<2°). Furthermore, we increased the π-electron density in the base layer to strengthen the OH-π interactions, which improved long-term boiling stability under hot water. We believe that this surface will be applied in fields in which the practical use of antifouling coatings is desirable, such as food containers, drink cans, and glassware.
KW - OH-π interaction
KW - boiling stability
KW - fluorine-free
KW - hot water repellency
KW - slippery surface
UR - http://www.scopus.com/inward/record.url?scp=85041439071&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85041439071&partnerID=8YFLogxK
U2 - 10.1021/acsami.7b15689
DO - 10.1021/acsami.7b15689
M3 - Article
C2 - 29323482
AN - SCOPUS:85041439071
VL - 10
SP - 4198
EP - 4205
JO - ACS applied materials & interfaces
JF - ACS applied materials & interfaces
SN - 1944-8244
IS - 4
ER -