Superomniphobic Surfaces for Military Applications – Nano- and Micro-Fabrication Methods. Year Two 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
This report explains the work accomplished during the reporting period (i.e. year 2) in four main areas: (i) Continued development of practical repellent coatings; a procedure was developed that results in improved durability under abrasion and water immersion while maintaining coating versatility. Additionally, a set of different layered superhydrophobic coatings have been proposed. (ii) Understanding the relationship between surface wear and wetting characteristics for superhydrophobic surfaces: a methodology was devised using confocal scanning microscopy that permits collection of quantitative information for surface texture. This, combined with measuring the contact angles on superhydrophobic coatings that were worn systematically, was used to compare findings with the predictions based on the classical Cassie equation. The need to develop a new relationship was identified. (iii) Theoretical work on developing fundamental knowledge about wetting of textured surfaces; a thermodynamic depiction of edge effect has been developed by free energy analysis. Results show good agreement with previous works. A universal wetting plot for describing the four wetting regions was obtained relating edge angle and intrinsic contact angle. The results have provided fundamental rules for designing robust superhydrophobic and superoleophobic surfaces. (iv) Fabrication of textured surfaces by lithographic methods to achieve repellency for oily liquids and surfactant solutions; not only were

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Report Number
DRDC-ATLANTIC-CR-2011-255 — Contractor Report
Date of publication
01 Dec 2011
Number of Pages
130
DSTKIM No
CA038023
CANDIS No
537938
Format(s):
Electronic Document(PDF)

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