Engineering a nanostructured 'super surface' with superhydrophobic and superkilling properties
| Autor: | Jafar Hasan, Kaushik Chatterjee, Lavendra Yadav, Shammy Raj |
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| Přispěvatelé: | Hasan, Jafar, Raj, Shammy, Yadav, Lavendra, Chatterjee, Kaushik |
| Rok vydání: | 2015 |
| Předmět: |
Surface (mathematics)
nanostructured surface Materials science General Chemical Engineering Microfluidics technology industry and agriculture Materials Engineering (formerly Metallurgy) Nanotechnology 02 engineering and technology General Chemistry surface topography 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Article 0104 chemical sciences inter-pillar spacings Contact angle Hysteresis Centre for Nano Science and Engineering Deep reactive-ion etching Wafer 0210 nano-technology Nanopillar |
| Zdroj: | RSC advances |
| ISSN: | 2046-2069 |
| DOI: | 10.1039/c5ra05206h |
| Popis: | We present a nanostructured "super surface" fabricated using a simple recipe based on deep reactive ion etching of a silicon wafer. The topography of the surface is inspired by the surface topographical features of dragonfly wings. The super surface is comprised of nanopillars 4 mm in height and 220 nm in diameter with random inter-pillar spacing. The surface exhibited superhydrophobicity with a static water contact angle of 154.0 degrees and contact angle hysteresis of 8.3 degrees. Bacterial studies revealed the bactericidal property of the surface against both gram negative (Escherichia coli) and gram positive (Staphylococcus aureus) strains through mechanical rupture of the cells by the sharp nanopillars. The cell viability on these nanostructured surfaces was nearly six-fold lower than on the unmodified silicon wafer. The nanostructured surface also killed mammalian cells (mouse osteoblasts) through mechanical rupture of the cell membrane. Thus, such nanostructured super surfaces could find applications for designing selfcleaning and anti-bacterial surfaces in diverse applications such as microfluidics, surgical instruments, pipelines and food packaging. Refereed/Peer-reviewed |
| Databáze: | OpenAIRE |
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