Graphene-based Janus micromotors for the dynamic removal of pollutants

Orozco, Jahir; Mercante, Luiza A.; Pol, Roberto; Merkoçi, Arben

doi:10.1039/c5ta09850e

Cited by 119 publications

(83 citation statements)

References 44 publications

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“…Generally, they have been used in approaches which focused on biomedical sciences, but micro/nanomotors exhibited unique potentials for environmental remediation and water purification . The combination of active motion and surface multifunctionalities introduced a new artificial swimmers for use in water purification such as degradation of organic pollutants and chemical toxic agents . Further, micro/nanomotors can be used for sensing and detection of pH, biological agents, and other chemicals …”

Section: Introductionmentioning

confidence: 99%

Self‐Propelled Micro/Nanomotors for Sensing and Environmental Remediation

Zarei

2018

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140

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Self-propelled micro/nanomotors have gained attention for successful application in cargo delivery, therapeutic treatments, sensing, and environmental remediation. Unique characteristics such as high speed, motion control, selectivity, and functionability promote the application of micro/nanomotors in analytical sciences. Here, the recent advancements and main challenges regarding the application of self-propelled micro/nanomotors in sensing and environmental remediation are discussed. The current state of micro/nanomotors is reviewed, emphasizing the period of the last five years, then their developments into the future applications for enhanced sensing and efficient purification of water resources are extrapolated.

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Section: Introductionmentioning

confidence: 99%

Self‐Propelled Micro/Nanomotors for Sensing and Environmental Remediation

Zarei

2018

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140

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“…[10][11][12] In addition, they contain many surface functionalities 13 which open new opportunities to develop micro and nanodevices as efficient tools for water cleaning. [14][15][16] Currently, micromotors have been developed for the efficient degradation of organic pollutants, 12,17-20 chemical warfare agents 11,21 and the capture of organic and inorganic [22][23][24][25][26][27][28][29] pollutants, such as heavy metals. 29 New bactericidal micromotors [30][31][32] are recently being developed as new efficient tools for cleaning waterborne bateria due to the increasing threat of antibiotic resistant bacteria and the harmful chemical byproducts generated by conventional water disinfection methods.…”

Section: Introductionmentioning

confidence: 99%

Microbots Decorated with Silver Nanoparticles Kill Bacteria in Aqueous Media

Vilela

Stanton

Parmar

et al. 2017

ACS Appl. Mater. Interfaces

137

115

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KEYWORDS Silver nanoparticles, water propulsion, bacteria remediation, biocompatibility and environmental application.Water contamination is one of the most persistent problems in public health. The resistance of some pathogens to conventional disinfectants can require the combination of multiple disinfectants or increased their dosages which may produce harmful by-products. Here, we describe an efficient disinfection and removal method of Escherichia coli (E. coli) from contaminated water by using water self-propelled Janus microbots decorated with silver nanoparticles (AgNPs). The spherical Janus microbot's structure consists of a magnesium (Mg) microparticle as a template that also functions as propulsion source by producing hydrogen bubbles while in contact with water, an inner iron (Fe) magnetic layer for their remote guidance and collection, and an outer AgNP coated gold (Au) layer for bacteria adhesion and bactericidal properties. The active motion of microbots improves the chances of the contact of microbot surface decorated AgNPs with the bacteria, which provokes the selective Ag + release in bacteria cytoplasma, and their self-propulsion increase diffusion of the released Ag + ions. In addition, the AgNPs coated Au metal cap of the microbots has dual capabilities capturing bacteria and then killing them. Thus, we have demonstrated that AgNPs coated Janus microbots are capable of efficiently killing more than 80% of E. coli compared to colloidal AgNPs that killed less than 35% of E. coli in 15 minutes in contaminated water solutions. After bacteria capture and extermination, the magnetic properties of the cap allow microbots to be collected from water with the captured dead bacteria, leaving water with no contaminants. The presented biocompatible Janus microbots offers an encouraging method for rapid disinfection of water.

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“…Micro‐ and nanomotors are tinny devices that self‐propel in an aqueous media by converting physical and (bio)chemical energy into motion. The great potential of micromotors has been widely demonstrated during the last decade in multiple applications that go from the biomedical field, environmental monitoring, and water remediation to diagnostics and operation in real‐life environments . Micromotors have been fabricated utilizing a wide range of technologies, including microelectronic technology, electroplating, 3D printing, and inkjet printing .…”

Section: Introductionmentioning

confidence: 99%

“…In this context, this is the first report on a simple, paper‐based, wax‐printed graphene rolled‐up micromotors. Graphene have been already the structural material of some Janus and electroplated tubular micromotors, but not in connection to the wax‐printed (“stamping”) technology presented herein which is extremely advantageous in term of cost‐efficiency and versatility for future applications …”

Section: Introductionmentioning

confidence: 99%

“…Although Janus and rolled‐up microfabricated micromotors have been developed with graphene, this is the first report that relies on an easy, operator‐friendly, fast, and cost‐efficient wax‐printed paper‐based method. Such a method has been previously reported by our group for printed electronics into substrates, but not in connection to micromotors . A suitable modification of such process by inducing curvature on the GO sheet until rolled‐up tube formation provides a novel route to build versatile on‐demand engineered tubular GO structures.…”

Section: Introductionmentioning

confidence: 99%

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Architecting Graphene Oxide Rolled‐Up Micromotors: A Simple Paper‐Based Manufacturing Technology

Baptista-Pires

Orozco

Guardia

et al. 2017

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A graphene oxide rolled-up tube production process is reported using wax-printed membranes for the fabrication of on-demand engineered micromotors at different levels of oxidation, thickness, and lateral dimensions. The resultant graphene oxide rolled-up tubes can show magnetic and catalytic movement within the addition of magnetic nanoparticles or sputtered platinum in the surface of graphene-oxide-modified wax-printed membranes prior to the scrolling process. As a proof of concept, the as-prepared catalytic graphene oxide rolled-up micromotors are successfully exploited for oil removal from water. This micromotor production technology relies on an easy, operator-friendly, fast, and cost-efficient wax-printed paper-based method and may offer a myriad of hybrid devices and applications.

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Graphene-based Janus micromotors for the dynamic removal of pollutants

Abstract: A SiO2@rGO–Pt Janus micromotors-based strategy for the enhanced removal of POPs for their appropriate final disposition.

Cited by 119 publications

References 44 publications

Self‐Propelled Micro/Nanomotors for Sensing and Environmental Remediation

Self‐Propelled Micro/Nanomotors for Sensing and Environmental Remediation

Microbots Decorated with Silver Nanoparticles Kill Bacteria in Aqueous Media

Architecting Graphene Oxide Rolled‐Up Micromotors: A Simple Paper‐Based Manufacturing Technology

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