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Green Approach for the Simultaneous Synthesis and Separation of Gold Nanoparticles.

K Hima Nandini1, Kurian Sinu1, S Pushpavanam1

  • 1Department of Chemical Engineering, Indian Institute of Technology Madras, Chennai 600036, Tamil Nadu, India.

Langmuir : the ACS Journal of Surfaces and Colloids
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Summary

This study demonstrates a novel aqueous two-phase system (ATPS) for synthesizing and separating gold nanoparticles (AuNPs). This method enables continuous production and purification of stable AuNPs, overcoming limitations of organic solvents in nanoparticle synthesis.

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Biomedical Engineering

Background:

  • Gold nanoparticles (AuNPs) offer significant diagnostic and therapeutic potential due to their biocompatibility and surface-functionalization capabilities.
  • Traditional synthesis methods often employ organic solvents, limiting their use in medicine.
  • Efficient, large-scale production necessitates simultaneous synthesis and separation of nanoparticles.

Purpose of the Study:

  • To develop an aqueous two-phase system (ATPS) for the simultaneous synthesis and separation of stable gold nanoparticles (AuNPs).
  • To investigate the self-assembly behavior of AuNPs at the fluid-fluid interface within an ATPS for streamlined processing.
  • To establish a foundation for continuous, large-scale, and controlled synthesis of AuNPs.

Main Methods:

  • Utilized an aqueous two-phase system (ATPS) composed of polyethylene glycol (PEG) and trisodium citrate dihydrate for AuNP synthesis.
  • Exploited the reducing properties of PEG and citrate to synthesize AuNPs within the ATPS.
  • Investigated nanoparticle self-assembly at the interface formed by complementary solutions, followed by characterization using UV-Vis spectroscopy, SEM, and TEM.

Main Results:

  • AuNPs synthesized solely with citrate were unstable.
  • AuNPs synthesized within the ATPS using PEG-600 were effectively separated by self-assembly at the interface.
  • AuNPs synthesized using PEG-6000 remained in the bulk phase.
  • Demonstrated continuous synthesis and separation of AuNPs in slug flow within a millichannel.

Conclusions:

  • The developed ATPS provides an effective, solvent-free method for synthesizing and separating stable gold nanoparticles.
  • Self-assembly at the fluid-fluid interface offers a facile separation strategy, reducing downstream processing.
  • The millichannel continuous flow system represents a promising advancement for scalable and controlled AuNP production.