Superomniphobic Surfaces for Military Applications: Nano- and Micro-Fabrication Methods – Year Three Report

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Authors
  1. Amirfazli, A.
Corporate Authors
Defence R&D Canada - Atlantic, Dartmouth NS (CAN);Alberta Univ, Edmonton ALTA (CAN) Dept of Mechanical Engineering
Abstract
Superomniphobic surfaces possess unique properties that limit the ability of aqueous and organic liquids to adhere to the surface. As a result surface contamination should be minimized and their cleanability improved. Such traits in a material will have potential benefits to military systems ranging from rainwear, to chemical agent protection, to improved communications, and corrosion protection. This document reports on: the improvement of a sprayable superomniphobic coating by modifying the components; the study of the relationship between surface wear and wetting characteristics using confocal microscopy; and the interpretation of contact angle measurements for liquids on lithographically produced surfaces. A more durable coating was made however it was still susceptible to degradation with liquid contact duration. Skewedness and root mean square roughness surface descriptors have been identified for characterizing wear-wetting relationships; however, a combination of many surface parameters may be required to adequately wetting-wear behaviour. Finally it was found that the cosine of the measured contact angle accurately agrees with the cosine angle predicted by the Cassie equation for measurements made on complex lithographic surfaces, indicating that this equation can be used for designing surfaces.

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Report Number
DRDC-ATLANTIC-CR-2012-216 — Contract Report
Date of publication
01 Oct 2012
Number of Pages
102
DSTKIM No
CA039196
CANDIS No
539344
Format(s):
Electronic Document(PDF)

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