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Related Concept Videos

Microbial Biosensors01:17

Microbial Biosensors

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Microbial biosensors are analytical devices that utilize living microbes to detect specific substances through measurable signals. These devices consist of two main components: biosensing organisms and signal-transducing elements. Biosensing organisms, such as Escherichia coli or Saccharomyces cerevisiae, are typically housed in multiwell plates connected to transducers, enabling rapid, real-time detection of target analytes.Signal Generation MechanismWhen a target analyte—such as...
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Related Experiment Video

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Sponge-based motor integrated with fluorescence signal for microplastics capture.

Yajing Sun1, Chunhui Wang1, Jiabao An1

  • 1School of Chemical Engineering and Technology, Hebei University of Technology, Xiping Road No. 5340, Beichen District, Tianjin 300401, China; Hebei Key Laboratory of Functional Polymers, Hebei University of Technology, Xiping Road No. 5340, Beichen District, Tianjin 300401, China.

Journal of Colloid and Interface Science
|December 17, 2025
PubMed
Summary

Two novel sponge-based motors were developed to capture and detect polyethylene microplastics (MPs) in water. These composite motors offer a promising solution for environmental monitoring and microplastic removal challenges.

Keywords:
Carbon dotsFluorescent signalsMicroplasticsOptical-actuated

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Area of Science:

  • Materials Science
  • Environmental Science
  • Nanotechnology

Background:

  • Microplastic (MP) pollution is a significant environmental threat due to the widespread use of plastics.
  • Effective methods for quantifying and removing MPs from aquatic ecosystems are urgently needed.

Purpose of the Study:

  • To develop composite sponge-based motors for the capture and fluorescence tracing of polyethylene (PE) MPs.
  • To investigate two distinct driving mechanisms for enhanced MP removal efficiency and adaptability.

Main Methods:

  • Fabrication of a H2O2-driven Janus motor (BCNPs/TiO2/PDA@MS) using melamine sponge, polydopamine, TiO2, and boron-doped carbon nanoparticles (BCNPs).
  • Synthesis of a magnetically driven sponge motor (BCNPs/PDA/Fe3O4@MS) incorporating Fe3O4 nanoparticles for external magnetic field control.
  • Evaluation of motor speeds, MP capture efficiency via van der Waals forces, and fluorescence tracing capabilities.

Main Results:

  • The H2O2-driven motor achieved a speed of 0.11 mm/s and captured PE MPs within 20 minutes.
  • The magnetically driven motor demonstrated a higher speed of 0.77 mm/s under an external magnetic field.
  • Both motors effectively served as fluorescent tag platforms due to the properties of BCNPs, enabling combined MP capture and detection.

Conclusions:

  • The developed sponge-based motors provide an efficient and adaptable approach for capturing and detecting microplastics in aquatic environments.
  • This research offers a novel pathway for the monitoring and remediation of microplastic pollution.
  • The dual functionality of capture and fluorescence tracing presents a significant advancement in microplastic management strategies.