Bio-inspired functional materials
Loading...
URL
Journal Title
Journal ISSN
Volume Title
School of Science |
Doctoral thesis (article-based)
| Defence date: 2012-11-20
Checking the digitized thesis and permission for publishing
Instructions for the author
Instructions for the author
Unless otherwise stated, all rights belong to the author. You may download, display and print this publication for Your own personal use. Commercial use is prohibited.
Authors
Date
2012
Major/Subject
Mcode
Degree programme
Language
en
Pages
53 + app. 35
Series
Aalto University publication series DOCTORAL DISSERTATIONS, 154/2012
Abstract
The thesis shows strategies how to learn from Mother Nature to make functional materials. Firstly, inspired by lotus leaf and water strider, superhydrophobic and superoleophobic surfaces are prepared from nanofibrillated cellulose aerogels. Furthermore, we explore potential applications of the superhydrophobic and superoleophobic materials for carrying cargo on liquid surfaces and continuous propulsion. Interestingly, the self-propelled locomotion has constant velocity and can last for prolonged time. This allows transduction of chemical energy into motility and could open doors for new generation of autonomous miniaturized soft devices. Subsequently, superhydrophobic and superoleophobic surfaces are made from silica aerogel, and the emphasis is on the damage resistance of superhydrophobicity and superoleophobicity. After mechanical abrasion with sandpaper, the superhydrophobicity and superoleophobicity retain. More interestingly, the contact angle hysteresis for water and oil decreases after abrasion with sandpaper. The last part of the thesis is about bio-inspired tough materials from nanofibrillated cellulose and nanoclay. By a simple method of centrifugation, bulk nanocomposites are achieved that have a high work to fracture of 23.1 MJ/m3 with high strain to failure of 36% under compression. Considering the simple preparation methods and bio-based origins of nanocellulose and clay, the tough material shows potential in applications for sustainable and environmentally friendly materials in construction and transportation.Description
Supervising professor
Ikkala, Olli, Acad. Prof.Thesis advisor
Ras, Robin H. A., Dr.Keywords
nanocellulose, non-wetting, floatation, propulsion, toughness
Other note
Parts
- [Publication 1]: Hua Jin, Marjo Kettunen, Ari Laiho, Hanna Pynnönen, Jouni Paltakari, Abraham Marmur, Olli Ikkala, and Robin H. A. Ras. 2011. Superhydrophobic and superoleophobic nanocellulose aerogel membranes as bioinspired cargo carriers on water and oil. Langmuir, volume 27, number 5, pages 1930-1934.
- [Publication 2]: Hua Jin, Abraham Marmur, Olli Ikkala, and Robin H. A. Ras. 2012. Vapour-driven Marangoni propulsion: continuous, prolonged and tunable motion. Chemical Science, volume 3, number 8, pages 2526-2529.
- [Publication 3]: Hua Jin, Anyuan Cao, Enzheng Shi, Jani Seitsonen, Luhui Zhang, Robin H. A. Ras, Lars A. Berglund, Mikael Ankerfors, Andreas Walther, and Olli Ikkala. Ionically interacting nanoclay and nanofibrillated cellulose lead to tough bulk nanocomposites in compression by forced self-assembly. Journal of Materials Chemistry B, under revision.
- [Publication 4]: Hua Jin, Xuelin Tian, Olli Ikkala, and Robin H. A. Ras. Preservation of superhydrophobic and superoleophobic properties upon wear damage. ACS Applied Materials & Interfaces, submitted for publication.