Herzog M.B., Johnston J.H., Franzreb M.
Victoria University of Wellington, NZ
Keywords: 3D printing, contact-angle hysteresis, hierarchical structure, polymers, roll-off angle, superhydrophilic, superhydrophobic, wool
A new generation of materials possessing a wide range of possible consumer applications such as water harvesting, stain resistant self-cleaning and water-repellent breathable surfaces are being fabricated. Based on nature’s example of the stenocara beetle, superhydrophobic and superhydrophilic surfaces have been developed, using either a hierarchical surface structure in the micro and nano range, created via layer-by-layer assembly of functionalised silica nanospheres of different diameters, or a single level surface structure. Both, woven and non-woven woollen textile substrates were modified. Static contact angles of 160°, with corresponding contact angle hysteresis and roll-off angles below 20° for a 10 µL droplet have been measured. The obtained knowledge of the structural design and chemical surface alterations through Dynasylan® or perfluorooctylamine was then combined with theoretical calculations. By utilizing 3D printing an array of new surface patterns was developed which show promising results. Single level surface structures open up a simple and inexpensive way to fabricate both superhydrophobic and superhydrophilic patterned surfaces and the combination of both types of surfaces allows the creation of a patterning similar to that of the beetle.
Journal: TechConnect Briefs
Volume: 1, Nanotechnology 2013: Advanced Materials, CNTs, Particles, Films and Composites (Volume 1)
Published: May 12, 2013
Pages: 659 - 662
Industry sector: Advanced Materials & Manufacturing
Topics: Advanced Materials for Engineering Applications, Coatings, Surfaces & Membranes
ISBN: 978-1-4822-0581-7