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Friday, November 3, 2017 at 12:20pm to 1:10pm
Human Ecology Building (HEB), T49
Omniphobic coated stainless steel meshes constructed with smaller sizes were shown to yield higher resistance to surface wetting and wetting-through by the impinging liquids than larger meshes.1 This finding provides fabric developers with an opportunity to design and develop better omniphobic fabrics with optimal liquid robustness, which leads the way for successful developments of self-cleaning and enhanced CB protective clothing. Further addition of dual hierarchical structures to omniphobic fabrics have shown an increase in liquid repellency.2 Work presented in this seminar will introduce a novel fiber structure that represents a revolutionary idea to create inherently super nonwetting fibers and fabrics that require no liquid repellent coating. Based on MIT’s discovery in 2007,3,4 a team of government, academic, and industry was formed in 2013 to design and develop inherently superomniphobic fibers. These SO fibers have engineered reentrant nano-features that negate the need for using C8 (perfluorooctanoic acid) or C6 (perfluorohexanoic acid) coating to repel a wide range of low surface tension liquids for self-cleaning and enhanced chemical/biological (CB) protective clothing and shelters, as well as other commercial textile applications. Material selection, bicomponent fiber processing, fiber designs, test methods and results, selected surface and physical properties of inherently SO fabrics will be discussed and compared to conventional fabrics that were treated with fluorinated chemistries (i.e., C8 and C6). Future work will focus on leveraging and optimizing woven fabric parameters beneficial to liquid repellency and liquid robustness using inherently SO fibers, creating self-blooming SO fibers, exploring repellency to wider range of liquids. PAO#: U17-314.
S. Chhatre et al, Scale Dependence of Omniphobic Mesh Surfaces, Langmuir 2010, 26 (6), 4027-4035. Quoc Truong, NSRDEC’s research study to develop superomniphobic coatings, fibers, and surfaces. 2013-Present. A. Tuteja, W. Choi, M. Ma, J. M. Mabry, S. A. Mazzella, G. C. Rutledge, G. H. McKinley, R. E. Cohen, Science 2007, 318, 1618-1622 A. Tuteja, W. Choi, J. M. Mabry, G. H. McKinley, and R. E. Cohen,Proceedings of Natural Academy of Sciences, USA (2008), 18200-18205