Chi, YS Lee, JK Lee, S Choi, IS 2024-01-21T07:10:31Z 2024-01-21T07:10:31Z 2021-09-02 2004-04-13 0743-7463 https://pubs.kist.re.kr/handle/201004/137673 Water wettability Of Si/SiO2 surfaces was controlled by the formation of SAMs terminating in 1-alkyl-3-(3-silylpropyl)imidazolium ions and the anion exchange on the surfaces ("direct anion exchange"). The exchange was confirmed by X-ray photoelectron spectroscopy, and the water wettability was measured as a water contact angle by contact angle goniometry. We found that anions played a great role in determining water wettability Of Si/SiO2 surfaces. For example, water contact angles Of Si/SiO2 surfaces presenting 1-methyl-3-(3-silylpropyl)imidazolium ions changed from 28 to 42degrees when the counteranion Cl- was exchanged with PF6- In addition to the anions, the N-alkyl groups of imidazolium cations were also found to be important in determining water wettability: we did not observe any significant changes in the contact angles of Si/SiO2 surfaces presenting 1-butyl-3-(3-silylpropyl)imidazolium ions by the anion exchange. We also demonstrated that the reaction rate of the direct anion exchange was affected by a choice of solvents: the anion exchange from Cl- to PF6- was the fastest in an aqueous solution. English AMER CHEMICAL SOC SELF-ASSEMBLED MONOLAYERS ORGANIC-SURFACES LIQUIDS HEXAFLUOROPHOSPHATE CHEMISTRY PROTEINS POLYMERS BRUSHES ETHANOL WATER Control of wettability by anion exchange on Si/SiO2 surfaces Article 10.1021/la036340q 1 LANGMUIR, v.20, no.8, pp.3024 - 3027 LANGMUIR 20 8 3024 3027 scie scopus 000220750300007 2-s2.0-2342418879 Chemistry, Multidisciplinary Chemistry, Physical Materials Science, Multidisciplinary Chemistry Materials Science Article SELF-ASSEMBLED MONOLAYERS ORGANIC-SURFACES LIQUIDS HEXAFLUOROPHOSPHATE CHEMISTRY PROTEINS POLYMERS BRUSHES ETHANOL WATER ionic liquids SAM anion effect wettability