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Real-time modulated nanoparticle separation with an ultra-large dynamic range.

Kerwin Kwek Zeming1, Nitish V Thakor2, Yong Zhang3

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Summary

This study introduces a novel deterministic lateral displacement (DLD) device for real-time nanoparticle separation. The method utilizes electrostatic forces and buffer solutions for efficient, cost-effective purification across various scientific fields.

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Area of Science:

  • Nanotechnology and Materials Science
  • Biotechnology and Bio-analytics
  • Physical Chemistry

Background:

  • Size-dependent nanoparticle properties necessitate precise purification for applications in bio-analytics, medicine, and materials science.
  • Existing purification methods like centrifugation and chromatography are limited by aggregation, complexity, cost, and narrow dynamic range.

Purpose of the Study:

  • To develop a novel, efficient, and cost-effective method for real-time, size-selective nanoparticle purification.
  • To investigate and model the role of long-range electrostatic forces in nanoparticle separation within a deterministic lateral displacement (DLD) device.

Main Methods:

  • Utilized a large-pore (2 μm) deterministic lateral displacement (DLD) device without external force fields or nanofabrication.
  • Investigated nanoparticle separation by analyzing innate long-range electrostatic influences at varying NaCl ionic concentrations.
  • Developed a model to quantify and modulate electrostatic force interactions between nanoparticles and micropores.

Main Results:

  • Achieved real-time nanoparticle separation for sizes ranging from 51-1500 nm.
  • Demonstrated dynamic size separation with rapid response time (<20 s) and an enlarged dynamic range (>1200%).
  • Showcased superior performance compared to standard benchtop centrifuge systems.

Conclusions:

  • The novel DLD method offers a simple, precise, and dynamically flexible approach to nanoparticle separation.
  • Accounting for electrostatic forces beyond Debye length is crucial for precise nanoparticle separation.
  • This technique holds significant potential for high-throughput nano-separation in industrial and biological applications.