Nanoporous Monolithic Microsphere Arrays Have Anti-Adhesive Properties Independent of Humidity
| Autor: | Martin Steinhart, Stanislav N. Gorb, Alexander Kovalev, Elena V. Gorb, Anna Eichler-Volf, Longjian Xue |
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| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Materials science
monoliths FOS: Physical sciences 02 engineering and technology Condensed Matter - Soft Condensed Matter surfaces 010402 general chemistry lcsh:Technology 01 natural sciences Article Microsphere General Materials Science Relative humidity biomimetics Composite material lcsh:Microscopy Softening block copolymers microspheres monolayers adhesion nanoporous materials lcsh:QC120-168.85 Condensed Matter - Materials Science lcsh:QH201-278.5 lcsh:T Nanoporous Materials Science (cond-mat.mtrl-sci) Humidity Adhesion 021001 nanoscience & nanotechnology 0104 chemical sciences Nanopore lcsh:TA1-2040 Soft Condensed Matter (cond-mat.soft) lcsh:Descriptive and experimental mechanics lcsh:Electrical engineering. Electronics. Nuclear engineering Adhesive lcsh:Engineering (General). Civil engineering (General) 0210 nano-technology lcsh:TK1-9971 |
| Zdroj: | Materials; Volume 9; Issue 5; Pages: 373 Materials Materials, Vol 9, Iss 5, p 373 (2016) |
| ISSN: | 1996-1944 |
| DOI: | 10.3390/ma9050373 |
| Popis: | Bioinspired artificial surfaces with tailored adhesive properties have attracted significant interest. While fibrillar adhesive pads mimicking gecko feet are optimized for strong reversible adhesion, monolithic microsphere arrays mimicking the slippery zone of the pitchers of carnivorous plants of the genus Nepenthes show anti-adhesive properties even against tacky counterpart surfaces. In contrast to the influence of topography, the influence of relative humidity (RH) on adhesion has been widely neglected. Some previous works deal with the influence of RH on the adhesive performance of fibrillar adhesive pads. Commonly, humidity-induced softening of the fibrils enhances adhesion. However, little is known on the influence of RH on solid anti-adhesive surfaces. We prepared polymeric nanoporous monolithic microsphere arrays (NMMAs) with microsphere diameters of a few 10 {\mu}m to test their anti-adhesive properties at RHs of 2 % and 90 %. Despite the presence of continuous nanopore systems through which the inner nanopore walls were accessible to humid air, the topography-induced anti-adhesive properties of NMMAs on tacky counterpart surfaces were retained even at RH = 90 %. This RH-independent robustness of the anti-adhesive properties of NMMAs significantly contrasts the adhesion enhancement by humidity-induced softening on nanoporous fibrillar adhesive pads made of the same material. |
| Databáze: | OpenAIRE |
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