Nanosynthesis and Nanopatterning based on "Drop-on-a-hot-Plate"
Zusammenfassung der Projektergebnisse
The project built on an original discovery reported in Advanced Materials where we observed that a running and impacted droplet at the Leidenfrost temperature leaves behind nanoparticles on the surface. This observation has raised many questions about the origin of the nanoparticles formation. Initially, the mechanism and location of nanoparticles formation was unclear and we were unable to prove by any means that the nanoparticles are formed inside the drop. Moreover, the chemical nature of the Leidenfrost phenomenon including the role of water in the synthesis were uncertain. In the last five years we performed extensive research on this puzzling subject to explore its mechanism and control the fabrication process to further develop this phenomenon for practical application. Indeed, our research has resolved an old dilemma (Leidenfrost phenomenon). Our endeavor proved the electrostatic nature (due to the generated charges by fast evaporation event) of the phenomenon along with its thermoelectric and thermophoresis capabilities extracted through the thermal gradient. We introduced a new type of charge chemistry throughout of this research and demonstrate undoubtedly a green chemistry laboratory inside a levitated droplet. Our results showed the high efficiency of water based green nanochemistry using the Leidenfrost drop and the broad utility of employing the effect's unique physiochemical character. We introduced a new green technique that allows the fabrication of nanomaterials and simultaneously implementing it to design of functional materials by a fast one step, low cost and environmentally friendly manner, all in a levitated drop. Particularly noteworthy is the design of the first plasmonic nanoporous gold in suspension form that allow us to demonstrate the first bottom-up based wideband black absorber. 3D coating of complex structure which was performed under the Leidenfrost dynamics further shows the uniqueness of this phenomenon for nano-coating processes. These results published in Nature Communications were highlighted in different presses (e.g., Nature press office, American Chemical Society through Chemical & Engineering News (C&EN) and Royal Society of Chemistry via Chemistry World and MRS bulletin). The work has drawn the attention of some worldwide known magazines such as Spiegel and the Guardian as well as many other presses in Italy, Russia and China. Even more, it is worth mentioning that our Leidenfrost reactor is going to be integrated for a school experiment as a simple and new green method for nanosynthesis through our collaboration with Dr. Stefan Schwarzer ( Leibniz-Institut für die Pädagogik der Naturwissenschaften und Mathematik, Didaktik der Chemie, Christian-Albrechts-Universität zu Kiel). NPG asia-pacific: http://www.natureasia.com/en/research/highlight/8877 New scientist: http://www.newscientist.com/article/dn24481-skittering-water-droplets-spin-tiny-sponges-of-gold.html#.VHWJHckhAWJ Chemistry World: http://www.rsc.org/chemistryworld/2013/10/nanoparticle-synthesis-leidenfrost-drop-levitating Physics.org: http://phys.org/news/2013-10-nanoparticles-fabricated-leidenfrost-video.html Chemical and Engineering News (C & EN): http://cen.acs.org/articles/91/i44/Water-Catalyzed-Nanofabrication-Strikes-Gold.html?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+materials_scene+%28Chemical+%26+Engineering+News%3A+Materials+SCENE%29 Spiegel Online (in German): http://www.spiegel.de/wissenschaft/technik/leidenfrost-effekt-mini-reaktoren-tanzen-auf-der-herdplatte-a-931039.html University of Kiel (in German): http://www.uni-kiel.de/pressemeldungen/?pmid=2013-353-gruene-chemie Guardian: http://www.theguardian.com/science/small-world/2013/nov/21/nanotech-roundup-chemistry-gadets-energy MRS Bulletin (News & Analysis): http://journals.cambridge.org/action/displayFulltext?type=6&fid=9147089&jid=MRS&volumeId=39&issueId=01&aid=9147088&bodyId=&membershipNumber=&societyETOCSession=&fulltextType=XX&fileId=S0883769413003199
Projektbezogene Publikationen (Auswahl)
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"Design of a Perfect Black Absorber at Visible Frequencies using plasmonic metamaterials," Advanced Materials, vol. 23, no. 45, pp. 5410-5414, 2011
M. K. Hedayati, M. Javaherirahim, B. Mozooni, R. Abdelaziz, A. Tavassolizadeh, V. S. K. Chakravadhanula, V. Zaporojtchenko, T. Strunkus, F. Faupel and M. Elbahri
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"Design of a Perfect Black Absorber at Visible Frequencies using plasmonic metamaterials," Advanced Materials, vol. 23, no. 45, pp. 5410-5414, 2011
M. K. Hedayati, M. Javaherirahim, B. Mozooni, R. Abdelaziz, A. Tavassolizadeh, V. S. K. Chakravadhanula, V. Zaporojtchenko, T. Strunkus, F. Faupel and M. Elbahri
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"Green chemistry and nanofabrication in a levitated Leidenfrost drop," Nature communications, vol. 4, p. 2400, 2013
R. Abdelaziz, D. Disci-Zayed, M. Hedayati, J. Pohls, A. Zillohu, B. Erkartal, V. Chakravadhanula, V. Duppel, L. Kienle and M. Elbahri
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"Review of Plasmonic Nanocomposite Metamaterial Absorber," Materials, vol. 7, no. 2, pp. 1221-1248, 2014
M. K. Hedayati, F. Faupel and M. Elbahri
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"Toxicity of Functional Nano-Micro Zinc Oxide Tetrapods: Impact of Cell Culture Conditions, Cellular Age and Material Properties," Plos one, vol. 9, p. e84983, 2014
H. Papavlassopoulos, Y. Mishra, S. Kaps, I. Paulowicz, R. Abdelaziz, M. Elbahri, E. Maser, R. Adelung and C. Röhl
