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@article{1842562,
author = {Urso, M. and Ussia, M. and Pumera, M.},
article_location = {Wrinheim},
article_number = {28},
doi = {http://dx.doi.org/10.1002/adfm.202101510},
keywords = {iron oxides; micromotors; photocatalysis; plastics; pollutants; polymers; water purification},
language = {eng},
issn = {1616-301X},
journal = {Advanced Functional Materials},
title = {Breaking Polymer Chains with Self-Propelled Light-Controlled Navigable Hematite Microrobots},
url = {https://onlinelibrary.wiley.com/doi/10.1002/adfm.202101510},
volume = {31},
year = {2021}
}
TY - JOUR
ID - 1842562
AU - Urso, M. - Ussia, M. - Pumera, M.
PY - 2021
TI - Breaking Polymer Chains with Self-Propelled Light-Controlled Navigable Hematite Microrobots
JF - Advanced Functional Materials
VL - 31
IS - 28
SP - 2101510
EP - 2101510
PB - Wiley-VCH Verlag
SN - 1616301X
KW - iron oxides
KW - micromotors
KW - photocatalysis
KW - plastics
KW - pollutants
KW - polymers
KW - water purification
UR - https://onlinelibrary.wiley.com/doi/10.1002/adfm.202101510
N2 - The increasing use of polymers has led to an uncontrollable accumulation of polymer waste in the environment, evidencing the urgent need for effective and definitive strategies to degrade them. Here, self-propelled light-powered magnetic field-navigable hematite/metal Janus microrobots that can actively move, capture, and degrade polymers are presented. Janus microrobots are fabricated by asymmetrically depositing different metals on hematite microspheres prepared by low-cost and large-scale chemical synthesis. All microrobots exhibit fuel-free motion capability, with light-controlled on/off switching of motion and magnetic field-controlled directionality. Higher speeds are observed for bimetallic coatings with respect to single metals. This is due to their larger mixed potential difference with hematite as indicated by Tafel measurements. As a model for polymers, the total degradation of high molecular weight polyethylene glycol is demonstrated by matrix-assisted laser desorption/ionization mass spectrometry. This result is attributed to the active motion of microrobots, enhanced electrostatic capture of polymer chains, improved charge separation at the hematite/metal interface, and catalyzed photo-Fenton reaction. This work opens the route toward the degradation of polymers and plastics in water using light.
ER -
URSO, M., M. USSIA and M. PUMERA. Breaking Polymer Chains with Self-Propelled Light-Controlled Navigable Hematite Microrobots. \textit{Advanced Functional Materials}. Wrinheim: Wiley-VCH Verlag, 2021, vol.~31, No~28, p.~2101510-2101519. ISSN~1616-301X. Available from: https://dx.doi.org/10.1002/adfm.202101510.
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