Separation of nanoparticles in aqueous multiphase systems through centrifugation

Area of Science:

• Nanotechnology
• Separation Science
• Biophysics

Background:

• Separating nanoparticles by size and shape is crucial for material science.
• Traditional separation methods can be time-consuming and inefficient.
• Aqueous multiphase systems (MuPSs) offer unique properties for separation media.

Purpose of the Study:

• To demonstrate the efficacy of MuPSs for nanoparticle separation using rate-zonal centrifugation.
• To investigate the separation of nanoparticles with varying shapes and sizes.
• To optimize nanoparticle separation for applications like gold nanorod synthesis.

Main Methods:

• Utilized aqueous multiphase systems (MuPSs) as a medium for rate-zonal centrifugation.
• Employed a three-phase system to separate reaction products from gold nanorod synthesis.
• Used a benchtop centrifuge for nanoparticle separation experiments.

Main Results:

• Achieved efficient separation of nanorods, nanospheres, and larger particles.
• Demonstrated the stability of MuPS properties during centrifugation, aiding sample collection.
• Enriched gold nanorods from 48% to 99% purity in under ten minutes.

Conclusions:

• Aqueous multiphase systems are effective and stable media for nanoparticle separation.
• Rate-zonal centrifugation in MuPSs provides a rapid and efficient method for purifying nanoparticles.
• This technique shows significant potential for applications in nanotechnology and materials synthesis.