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Positionable vertical microfluidic cell based on electromigration in a theta pipet.

Michael A O'Connell1, Michael E Snowden, Kim McKelvey

  • 1Department of Chemistry, and ‡MOAC Doctoral Training Centre, University of Warwick , Coventry CV4 7AL, United Kingdom.

Langmuir : the ACS Journal of Surfaces and Colloids
|August 1, 2014
PubMed
Summary
This summary is machine-generated.

A novel microscale fluidic cell system precisely controls particle and molecule deposition on surfaces using electric fields. This technique enables real-time, quantitative analysis of adsorption and uptake on biological cells, advancing surface science and cell studies.

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Area of Science:

  • Surface Science and Nanotechnology
  • Microfluidics and Electrophoresis
  • Cell Biology and Biophysics

Background:

  • Controlled deposition of micro/nanoparticles and molecules onto surfaces is crucial for materials science and cell studies.
  • Existing techniques often lack spatial precision or real-time quantitative analysis capabilities.
  • Understanding electrostatic interactions and interfacial phenomena is key to controlling surface adsorption.

Purpose of the Study:

  • To develop and demonstrate a microscale vertical fluidic cell system for precise, real-time surface deposition and analysis.
  • To investigate the electrostatic effects on the adsorption of microparticles onto charged surfaces.
  • To showcase the system's applicability for live biological substrates, including targeted labeling and uptake studies on plant cells.

Main Methods:

  • Implementation of a theta-pipet-based fluidic cell system with controlled electrode placement for electric field generation.
  • Real-time quantitative monitoring of fluorescently-labeled material adsorption using laser scanning confocal microscopy.
  • Application of finite element method (FEM) modeling to analyze electric field distributions and deposition patterns.
  • Demonstration of targeted particle delivery and molecule uptake studies on live Zea mays root hair cells.

Main Results:

  • The fluidic cell system enables precise control over electromigration and deposition of charged species.
  • Significant electrostatic effects on microparticle adsorption rates were observed, dominated by the three-phase meniscus boundary.
  • The system successfully demonstrated targeted delivery and uptake of fluorescent particles and polymers onto single plant root cells.
  • FEM modeling provided insights into the relationship between electric field strength and surface deposition patterns.

Conclusions:

  • The developed microscale fluidic cell system offers a versatile platform for controlled surface deposition and real-time analysis.
  • The technique is effective for studying interfacial phenomena, electrostatic interactions, and biological interactions at the microscale.
  • This method opens new avenues for precise surface modification, targeted cellular delivery, and quantitative studies of biological processes.