期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 622, 期 -, 页码 759-768出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2022.04.135
关键词
MXene; Contact angle; Wettability; Surface modification; Surface energy
资金
- Slovak Grant Agency [APVV 19-0465, APVV-SK-BY-RD-19-0011, APVV-20-0111, VEGA: 2/00006/22]
- project Building-up Centre for Advanced Materials Application of the Slovak Academy of Sciences, ITMS [313021T081]
- Integrated Infrastructure Operational Programme - ERDF
- European Union [777810]
Ti3C2Tx MXene stands out from other 2D nanomaterials with its hydrophilicity, and the static contact angle value is independent of the background substrate wettability. In addition, a significant contact angle hysteresis is observed on a smooth surface, which is likely due to the chemical heterogeneity of surface terminal groups.
Hypothesis: One of the highlighted properties of Ti3C2Tx MXene compared to other 2D nanomaterials is its hydrophilicity. However, the broad range of static contact angles of Ti3C2Tx reported in the literature is misleading. To elucidate the experimental values of the static contact angles and get reproducible contact angle data, it is wiser to perform the advancing and receding contact angle measurements on smooth and compact Ti3C2Tx layers and focus on deep understanding of the physical basis behind the wettability, which is provided by contact angle hysteresis. Experiments: Measurements of the advancing and receding contact angle on mono-, bi, and trilayer Ti3C2Tx on two different substrates were performed. As substrates, UV-ozone treated silicon wafer and silicon wafer functionalized by (3-aminopropyl)triethoxysilane, were used. Findings: The values of the advancing contact angle on Ti3C2Tx on both substrates were proved to be independent of the number of Ti3C2Tx layers, demonstrating a negligible effect of the background substrate wettability. In addition, a giant contact angle hysteresis (44-52 degrees) was observed on very smooth surface, most likely as a result of chemical heterogeneity arising from the diversity of surface terminal groups (F, O, and OH). The findings reported in this study provide a comprehensive understanding of the wettability of MXene. (c) 2022 Elsevier Inc. All rights reserved.
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