Photoresponsive liquid marbles and dry water
- Author(s)
- Tristan Tsai Yuan Tan, Aniq Ahsan, Michael R. Reithofer, Siok Wei Tay, Sze Yu Tan, Tzi Sum Andy Hor, Jia Min Chin, Benny Kia Jia Chew, Xiaobai Wang
- Abstract
Stimuli-responsive liquid marbles for controlled release typically rely on organic moieties that require lengthy syntheses. We report herein a facile, one-step synthesis of hydrophobic and oleophobic TiO2 nanoparticles that display photoresponsive wettability. Water liquid marbles stabilized by these photoresponsive TiO2 particles were found to be stable when shielded from ultraviolet (UV) radiation; however, they quickly collapsed after being irradiated with 302 nm UV light. Oil- and organic-solvent-based liquid marbles could also be fabricated using oleophobic TiO2 nanoparticles and show similar UV-induced collapse. Finally, we demonstrated the formation of the micronized form of water liquid marbles, also known as dry water, by homogenization of the TiO2 nanoparticles with water. The TiO 2 dry water displayed a similar photoresponse, whereby the micronized liquid marbles collapsed after irradiation and the dry water turned from a free-flowing powder to a paste. Hence, by exploiting the photoresponsive wettability of TiO2, we fabricated liquid marbles and dry water that display photoresponse and studied the conditions required for their collapse.
- Organisation(s)
- External organisation(s)
- Agency for Science, Technology and Research A*STAR, National University of Singapore (NUS)
- Journal
- Langmuir
- Volume
- 30
- Pages
- 3448-3454
- No. of pages
- 7
- ISSN
- 0743-7463
- DOI
- https://doi.org/10.1021/la500646r
- Publication date
- 04-2014
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 104017 Physical chemistry
- ASJC Scopus subject areas
- General Materials Science, Condensed Matter Physics, Surfaces and Interfaces, Spectroscopy, Electrochemistry
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/92af6906-64f8-4f95-9ba6-0f53adf6a01a