Superhydrophobic Substrates from Off-The-Shelf Laboratory Filter Paper: Simplified Preparation, Patterning, and Assay Application

Peer reviewed: 
Yes, item is peer reviewed.
Scholarly level: 
Faculty/Staff
Final version published as: 

Zhang, L.; Kwok, H.; Li, X.; Yu, H.-Z. Superhydrophobic Substrates from Off-The-Shelf Laboratory Filter Paper: Simplified Preparation, Patterning, and Assay Application. ACS Applied Materials & Interfaces. Sept. 2017

DOI: 10.1021/acsami.7b08957

Date created: 
2017-09-21
Identifier: 
DOI: 10.1021/acsami.7b08957
Keywords: 
Filter paper
Silanization
Superhydrophobicity
Microfluidic paper-based analytical device (μPAD)
Nanostructure
Abstract: 

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 cellulose filter paper treated with a binary hexane solution of short (methyltrichlorosilane, MTS) and long (octadecyltrichlorosilane, OTS) organosilanes, exhibits remarkably high water contact angles (> 150 °) and low wetting hysteresis (~10 °). Beyond the optimized ratio between the two organosilanes, we have discovered that the thickness rather than the pore size dictates the resulting superhydrophobicity. Scanning electron microscope (SEM) images showed that silianization 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.

Description: 

The full text of this paper will be available on October 1, 2018 in accordance with the embargo periods of the American Chemical Society and in keeping with the Open Access requirements of NSERC funded research. If you require a fulltext copy of this paper before October 2018 please contact summit@sfu.ca

Language: 
English
Document type: 
Article
Rights: 
Rights remain with the author.
Sponsor(s): 
Natural Sciences and Engineering Research Council of Canada (NSERC)
Natural Science Foundation of China
Shanxi Special Programs for Platforms and Talents
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