Surface hydrophobicity: effect of alkyl chain length and network homogeneity
Surface hydrophobicity: effect of alkyl chain length and network homogeneity
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DOI：
10.1007/s11705-020-2003-0
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发表时间：
2020-11-09
影响因子：
4.5
通讯作者：
Heng, Jerry Y. Y.
中科院分区：
文献类型：
--
作者：
Chen, Wenqian;Karde, Vikram;Heng, Jerry Y. Y.
了解疏水性的本质在环境应用中具有根本的重要性。本研究以球形二氧化硅纳米颗粒（直径= 369 +/-7 nm）为模型材料，研究了烷基链网络与疏水性之间的关系。具有不同链长的两种烷基硅烷（三乙氧基甲基硅烷（C1）与三甲氧基（辛基）硅烷（C8））分别用于纳米颗粒的官能化。水接触角和反相气相色谱结果表明，烷基链长度对于控制疏水性是必不可少的，因为辛基官能化的纳米颗粒是高度疏水的（水接触角= 150.6度+/-6.6度），而甲基官能化的纳米颗粒是亲水的（即，水接触角= 0度，类似于原始纳米颗粒）。辛基链网络的均匀性也对疏水性有显著影响，因为使用甲基/辛基硅烷混合物（比例= 160：40 μ L·g（-1）纳米颗粒）时，水接触角从148.4度+/-3.5度显著降低到30.5度+/-1.0度。
Understanding the nature of hydrophobicity has fundamental importance in environmental applications. Using spherical silica nanoparticles (diameter = 369 +/- 7 nm) as the model material, the current study investigates the relationship between the alkyl chain network and hydro-phobicity. Two alkyl silanes with different chain length (triethoxymethylsilane (C1) vs. trimethoxy(octyl)silane (C8)) were utilised separately for the functionalisation of the nanoparticles. Water contact angle and inverse gas chromatography results show that the alkyl chain length is essential for controlling hydrophobicity, as the octyl-functionalised nanoparticles were highly hydrophobic (water contact angle = 150.6 degrees +/- 6.6 degrees), whereas the methyl-functionalised nanoparticles were hydrophilic (i.e., water contact angle = 0 degrees, similar to the pristine nanoparticles). The homogeneity of the octyl-chain network also has a significant effect on hydrophobicity, as the water contact angle was reduced significantly from 148.4 degrees +/- 3.5 degrees to 30.5 degrees +/- 1.0 degrees with a methyl-/octyl-silane mixture (ratio = 160:40 mu L.g(-1) nanoparticles).