Bio-inspired functional materials

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.advisor Ras, Robin H. A., Dr. Jin, Hua 2012-12-05T09:30:07Z 2012-12-05T09:30:07Z 2012
dc.identifier.isbn 978-952-60-4875-8 (electronic)
dc.identifier.isbn 978-952-60-4874-1 (printed)
dc.identifier.issn 1799-4942 (electronic)
dc.identifier.issn 1799-4934 (printed)
dc.identifier.issn 1799-4934 (ISSN-L)
dc.description.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. en
dc.format.extent 53 + app. 35
dc.format.mimetype application/pdf
dc.language.iso en en
dc.publisher Aalto University en
dc.publisher Aalto-yliopisto fi
dc.relation.ispartofseries Aalto University publication series DOCTORAL DISSERTATIONS en
dc.relation.ispartofseries 154/2012
dc.relation.haspart [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.
dc.relation.haspart [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.
dc.relation.haspart [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.
dc.relation.haspart [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.
dc.subject.other Physics en
dc.title Bio-inspired functional materials en
dc.type G5 Artikkeliväitöskirja fi Perustieteiden korkeakoulu fi School of Science en
dc.contributor.department Teknillisen fysiikan laitos fi
dc.contributor.department Department of Applied Physics en
dc.subject.keyword nanocellulose en
dc.subject.keyword non-wetting en
dc.subject.keyword floatation en
dc.subject.keyword propulsion en
dc.subject.keyword toughness en
dc.identifier.urn URN:ISBN:978-952-60-4875-8
dc.type.dcmitype text en
dc.type.ontasot Doctoral dissertation (article-based) en
dc.type.ontasot Väitöskirja (artikkeli) fi
dc.contributor.supervisor Ikkala, Olli, Acad. Prof.
dc.opn Burgert, Ingo, Prof., ETH Zürich, Switzerland
dc.rev Linder, Markus, Prof., Aalto University, Finland
dc.rev Rojas, Orlando J., Prof., North Carolina State University, USA 2012-11-20

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