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Water-Driven Micromotors for Rapid Photocatalytic Degradation of Biological and Chemical Warfare Agents

Li, Jinxing and Singh, Virendra V. and Sattayasamitsathit, Sirilak and Orozco, Jahir and Kaufmann, Kevin and Dong, Renfeng and Gao, Wei and Jurado-Sánchez, Beatriz and Fedorak, Yuri and Wang, Joseph (2014) Water-Driven Micromotors for Rapid Photocatalytic Degradation of Biological and Chemical Warfare Agents. ACS Nano, 8 (11). pp. 11118-11125. ISSN 1936-0851.

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Threats of chemical and biological warfare agents (CBWA) represent a serious global concern and require rapid and efficient neutralization methods. We present a highly effective micromotor strategy for photocatalytic degradation of CBWA based on light-activated TiO_2/Au/Mg microspheres that propel autonomously in natural water and obviate the need for external fuel, decontaminating reagent, or mechanical agitation. The activated TiO_2/Au/Mg micromotors generate highly reactive oxygen species responsible for the efficient destruction of the cell membranes of the anthrax simulant Bacillus globigii spore, as well as rapid and complete in situ mineralization of the highly persistent organophosphate nerve agents into nonharmful products. The water-driven propulsion of the TiO_2/Au/Mg micromotors facilitates efficient fluid transport and dispersion of the photogenerated reactive oxidative species and their interaction with the CBWA. Coupling of the photocatalytic surface of the micromotors and their autonomous water-driven propulsion thus leads to a reagent-free operation which holds a considerable promise for diverse “green” defense and environmental applications.

Item Type:Article
Related URLs:
URLURL TypeDescription Information
Dong, Renfeng0000-0001-7590-5750
Gao, Wei0000-0002-8503-4562
Additional Information:© 2014 American Chemical Society. Received 5 September 2014. Date accepted 7 October 2014. Published online 7 October 2014. Published in print 25 November 2014. This project received support from the Defense Threat Reduction Agency-Joint Science and Technology Office for Chemical and Biological Defense (Grant No. HDTRA1-13-1-0002 and HDTRA1-14-1-0064) and from the UCSD Calit2 Strategic Research Opportunities (CSRO) program. W.G. is a HHMI International Student Research fellow. R.D. and B.J.-S. acknowledge support from the China Scholarship Council (CSC) and the People Programme (Marie Curie Actions) of the EU seventh Framework Programme (REA Grant PIOF-GA-2012-326476), respectively. Authors thank W. Scott Jonas from the U.S. Army-Dugway Proving Ground for providing the B. golobigii spores.
Funding AgencyGrant Number
Defense Threat Reduction Agency (DTRA)HDTRA1-13-1-0002
Defense Threat Reduction Agency (DTRA)HDTRA1-14-1-0064
University of California San DiegoUNSPECIFIED
Calit2 Strategic Research OpportunitiesUNSPECIFIED
Howard Hughes Medical Institute (HHMI)UNSPECIFIED
China Scholarship CouncilUNSPECIFIED
Marie Curie FellowshipPIOF-GA-2012-326476
Subject Keywords:biological agents; chemical warfare defense; micromotors; photocatalytic degradation; titanium dioxide
Issue or Number:11
Record Number:CaltechAUTHORS:20180122-120032441
Persistent URL:
Official Citation:Water-Driven Micromotors for Rapid Photocatalytic Degradation of Biological and Chemical Warfare Agents Jinxing Li, Virendra V. Singh, Sirilak Sattayasamitsathit, Jahir Orozco, Kevin Kaufmann, Renfeng Dong, Wei Gao, Beatriz Jurado-Sanchez, Yuri Fedorak, and Joseph Wang ACS Nano 2014 8 (11), 11118-11125 DOI: 10.1021/nn505029k
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:84456
Deposited By: Ruth Sustaita
Deposited On:23 Jan 2018 13:32
Last Modified:09 Mar 2020 13:18

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