Superhydrophobic Substrates from Off-the-Shelf Laboratory Filter Paper: Simplified Preparation, Patterning, and Assay Application
Superhydrophobic Substrates from Off-the-Shelf Laboratory Filter Paper: Simplified Preparation, Patterning, and Assay Application
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来自现成实验室滤纸的超疏水基材：简化的制备、图案化和测定应用
DOI：
10.1021/acsami.7b08957
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发表时间：
2017-11-15
影响因子：
9.5
通讯作者：
Yu, Hua-Zhong
中科院分区：
文献类型：
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作者：
Zhang, Lishen;Kwok, Honoria;Yu, Hua-Zhong
不同孔径和厚度的现成实验室滤纸可以用无氟有机硅烷进行改性，使其具有超疏水性，可图案化，并可用于定量分析应用。特别地，我们已经证明，用短（甲基三氯硅烷）和长（十八烷基三氯硅烷）有机硅烷的二元己烷溶液处理的纤维素滤纸表现出显著高的水接触角（>150度）和低的润湿滞后（类似于10度）。除了两种有机硅烷之间的最佳比例之外，我们还发现厚度而不是孔径决定了所得的超疏水性。扫描电子显微镜图像显示硅烷化不会损坏纤维素微纤维;相反，它们被均匀的颗粒状纳米结构涂覆，这应该有助于观察到的表面性质。改性的滤纸是化学稳定和机械耐用;它可以很容易地与UV/臭氧处理图案化，以创建亲水区域，以准备比色pH和亚硝酸盐检测的化学测定。
Off-the-shelf laboratory filter paper of different pore sizes and thicknesses can be modified with fluorine-free organosilanes to be superhydrophobic, patternable, and ready for quantitative assay applications. In particular, we have demonstrated that the cellulose filter paper treated with a binary hexane solution of short (methyltrichlorosilane) and long (octadecyltrichlorosilane) organosilanes exhibits remarkably high water contact angles (>150 degrees) and low wetting hysteresis (similar to 10 degrees). Beyond the optimized ratio between the two organosilanes, we have discovered that the thickness rather than the pore size dictates the resulting super hydrophobicity. Scanning electron microscopy images showed that silanization does not damage the cellulose microfibers; instead, they are coated with uniform, particulate nanostructures, which should contribute to the observed surface properties. The modified filter paper is chemically stable and mechanically durable; it can be readily patterned with UV/ozone treatment to create hydrophilic regions to prepare chemical assays for colorimetric pH and nitrite detections.