SiC Nanowires with Tunable Hydrophobicity/Hydrophilicity and Their Application as Nanofluids

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• 作者：Junhong Chen ; Famin Zhai ; Meng Liu ; Xinmei Hou ; Kuo-Chih Chou
• 刊名：Langmuir
• 出版年：2016
• 出版时间：June 14, 2016
• 年：2016
• 卷：32
• 期：23
• 页码：5909-5916
• 全文大小：486K
• 年卷期：0
• ISSN：1520-5827

文摘

In this paper, several methods including HF, NaOH, TEOS, and PVP treatment were adopted to modify the wettability of silicon carbide (SiC) nanowires switching from hydrophobic to hydrophilic. The phase and microstructure investigated by XRD, FT-IR, XPS, TGA, SEM, and TEM demonstrated SiC nanowires switching from hydrophobic to hydrophilic due to the surface-tethered hydrophilic layer as well as increasing interspace between nanowires. Besides this, SiC nanowires with hydrophilicity may effectively improve the thermal conductivity of a fluid. The thermal conductivity of aqueous SiC nanowires after TEOS treatment with just 0.3 vol % was remarkably improved up to ca. 13.0%.