Superhydrophobic and superoleophobic nanocellulose aerogel membranes as bioinspired cargo carriers on water and oil
| Autor: | Abraham Marmur, Jouni Paltakari, Olli Ikkala, Hanna Pynnönen, Robin H. A. Ras, Hua Jin, Ari Laiho, Marjo Kettunen |
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| Rok vydání: | 2011 |
| Předmět: |
Buoyancy
Materials science Halogenation Surface Properties ta221 Nanofibers Nanotechnology engineering.material Microscopic scale Permeability Nanocellulose Surface tension Biomimetics Adhesives Electrochemistry General Materials Science Composite material ta216 Cellulose ta215 ta218 Spectroscopy ta214 ta114 Viscosity Water Aerogel Membranes Artificial Surfaces and Interfaces Silanes Condensed Matter Physics Nanostructures Macroscopic scale Nanofiber Oil droplet engineering Gases Gels Hydrophobic and Hydrophilic Interactions Oils |
| Zdroj: | Langmuir : the ACS journal of surfaces and colloids. 27(5) |
| ISSN: | 1520-5827 |
| Popis: | We demonstrate that superhydrophobic and superoleophobic nanocellulose aerogels, consisting of fibrillar networks and aggregates with structures at different length scales, support considerable load on a water surface and also on oils as inspired by floatation of insects on water due to their superhydrophobic legs. The aerogel is capable of supporting a weight nearly 3 orders of magnitude larger than the weight of the aerogel itself. The load support is achieved by surface tension acting at different length scales: at the macroscopic scale along the perimeter of the carrier, and at the microscopic scale along the cellulose nanofibers by preventing soaking of the aerogel thus ensuring buoyancy. Furthermore, we demonstrate high-adhesive pinning of water and oil droplets, gas permeability, light reflection at the plastron in water and oil, and viscous drag reduction of the fluorinated aerogel in contact with oil. We foresee applications including buoyant, gas permeable, dirt-repellent coatings for miniature sensors and other devices floating on generic liquid surfaces. |
| Databáze: | OpenAIRE |
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