Autonomous self-propelled MnO2 micromotors for hormones removal and degradation

Tesař, Jan; Ussia, Martina; Alduhaish, Osamah; Pumera, Martin

doi:10.1016/j.apmt.2021.101312

Cited by 9 publications

(7 citation statements)

References 24 publications

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“…Furthermore, the working process of MnO 2 @MnCO 3 micromotors was successfully monitored by the μ-Motor sensor. Micromotors are powerful tools for enhancing the catalytic degradation of organic pollutants, as their movement accelerates the degradation rate by enhancing the mass transfer in the medium. , To study the degradation process, MnO 2 @MnCO 3 particles were incubated with ultrapure water of the dyes (Rhodamine 6G, R6G). Visible light absorption spectroscopy showed 62.3% decolorization of R6G after adding the H 2 O 2 fuel into the environment with micromotors for 1 h (Figure c and Movie S5).…”

Section: Resultsmentioning

confidence: 99%

Portable Electrochemical Sensor for Micromotor Speed Monitoring

Ma,

Chen,

Bao

et al. 2023

ACS Sens.

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Autonomous movement promotes practical applications of micromotors. Understanding the moving speeds is a crucial step in micromotor studies. The current analysis method relies on an expensive optical microscope, which is limited to laboratory settings. Herein, we have developed a lightweight (0.15 g), portable (2.0 × 3.5 cm2), and low-cost (approximately $0.26) micromotor sensor (μ-Motor sensor), composed of water-sensitive materials for micromotor speed monitoring. Moving micromotors induce fluid flow, enhancing the evaporation rate of the liquid medium. Consequently, a high correlation between motor speed and water molecule concentration above the moving medium has been established. The μ-Motor sensor enables a real-time readout of the moving speed in various settings, with high accuracy (≥95% in the lab and ≥90% in field studies at a local beach). The μ-Motor sensor opens up a new way for detecting micro/nanomachine movements, illuminating future applications of micro/nanorobotics for diverse scenarios.

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Section: Resultsmentioning

confidence: 99%

Portable Electrochemical Sensor for Micromotor Speed Monitoring

Ma,

Chen,

Bao

et al. 2023

ACS Sens.

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“…The majority of micro and nanorobots used for water purification from organic molecules are assessed by their ability to remove or degrade dyes such as methylene blue and rhodamine B 30,[118][119][120] . However, these robots are also effective against more persistent and toxic pollutants, including chemical warfare agents 106 , phenolic 121,122 and nitroaromatic compounds 123,124 , antibiotics 125,126 , hormones 127 and psychoactive sub stances 128 . Nonetheless, several challenges related to their manufactur ing and operational costs and performance (removal or degradation efficiencies, reusability) limit the translation of micro and nanorobots to realworld settings.…”

Section: Organic Moleculesmentioning

confidence: 99%

Smart micro- and nanorobots for water purification

2023

Self Cite

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Less than 1% of Earth’s freshwater reserves is accessible. Industrialization, population growth and climate change are further exacerbating clean water shortage. Current water-remediation treatments fail to remove most pollutants completely or release toxic by-products into the environment. The use of self-propelled programmable micro- and nanoscale synthetic robots is a promising alternative way to improve water monitoring and remediation by overcoming diffusion-limited reactions and promoting interactions with target pollutants, including nano- and microplastics, persistent organic pollutants, heavy metals, oils and pathogenic microorganisms. This Review introduces the evolution of passive micro- and nanomaterials through active micro- and nanomotors and into advanced intelligent micro- and nanorobots in terms of motion ability, multifunctionality, adaptive response, swarming and mutual communication. After describing removal and degradation strategies, we present the most relevant improvements in water treatment, highlighting the design aspects necessary to improve remediation efficiency for specific contaminants. Finally, open challenges and future directions are discussed for the real-world application of smart micro- and nanorobots.

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“…It has been demonstrated that the self-propulsion of micromotors can accelerate fluid diffusion, micro-mixing and mass transport without applying external stirring, thus greatly enhancing the catalytic activity and shortening the reaction time compared with static remediation. [24][25][26][27][28][29] Kong et al developed unique Mg-based asymmetrical micromotors for the electrochemical detection of glucose in human serum. 30 They affirmed that the enhanced fluid and mass transfer in the solution caused by the fast movement of the microdevices could greatly enhance the detection signals and sensitivity of glucose detection.…”

Section: Introductionmentioning

confidence: 99%