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SM ISO690:2012 CIOBANU, Vladimir, GUIX, Maria, ENACHI, Mihail, POSTOLACHE, Vitalie, FOMIN, Vladimir, SCHMIDT, Oliver, TIGINYANU, Ion. Light-induced motion of microengines based on microarrays of TIO2 nanotubes. In: Health Technology Management: 3rd International Conference, Ed. 3, 6-7 octombrie 2016, Chișinău. Chișinău, Republica Moldova: Technical University of Moldova, 2016, Editia 3, p. 46. |
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Health Technology Management Editia 3, 2016 |
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Conferința "Health Technology Management" 3, Chișinău, Moldova, 6-7 octombrie 2016 | |||||||
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Pag. 46-46 | |||||||
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In this work, we demonstrate that TiO2 micro/nanotubular structures, fabricated by means of electrochemical anodization of Ti sheets, can act as self-propelled microengines when they are exposed to UV irradiation. Single nanotubes with conical internal shape with inner diameter varying from 50 to 120 nm and clusters of TiO2 nanotubes represented in figure 1, show propulsion through liquid consisting of oxygen peroxide and pure water. When exposed to UV-light, the microarrays of TiO2 nanotubes exhibiting conical internal shapes show directed motion in confined space as it is indicated in figure 2d. This light-induced motion of micro/nanoengines can be attributed to diffusiophoresis and localized nanobubble generation inside of the tubes due to the photocatalytic reactions occurring at the huge inner surface inherent to arrays of TiO2 nanotubes. [1] The intensity of the UV light will influence the chemical reaction speed and therefore the micro/nanoengines motion speed too (figure 2a-c,e). Depending on the postfabrication annealing conditions, different crystalline phases of TiO2 nanotubes are obtained. The anatase crystalline phase, is the most photocatalytically active [2], therefore, the efficiency of microengines consisting of TiO2 anatase phase nanotubes is the best one. Controlled pick-up, transport, and release of individual and agglomerated particles are demonstrated using the UV light irradiation of microengines. Due to the biocompatibility of TiO2, these micro-nanoengines find great potential in biomedical applications, for instance, they can act as drug delivery system. [3] |
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