AI Article Synopsis
- Scientists can make surfaces that repel water by changing their texture at different scales, like tiny bumps and grooves.
- They use a special method to create superhydrophobic (water-repelling) patterns on materials called SU-8 by adding small particles to it.
- This new way of controlling how water sticks to surfaces could help in making cool technology like sensors and medical tools.
Article Abstract
Water wetting and adhesion control on polymeric patterns are achieved by tuning the configuration of their surface's structural characteristics from single to dual and triple length-scale. In particular, surfaces with combined micro-, submicrometer-,and nanoroughness are developed, using photolithographically structured SU-8 micro-pillars as substrates for the consecutive spray deposition of polytetrafluoroethylene (PTFE) submicrometer particles and hydrophobically capped iron oxide colloidal nanoparticles. The PTFE particles alone or in combination with the nanoparticles render the SU-8 micropillars superhydrophobic. The water adhesion behaviour of the sprayed pillars is more complex since they can be tuned gradually from totally adhesive to completely non adhesive. The influence of the hierarchical geometrical features of the functionalized surfaces on this behaviour is discussed within the frame of the theory. Specially designed surfaces using the described technique are presented for selective drop deposition and evaporation. This simple method for liquid adhesion control on superhydrophobic surfaces can find various applications in the field of microfluidics, sensors, biotechnology, antifouling materials, etc.
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| http://dx.doi.org/10.1021/am404565a | DOI Listing |
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