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'Nano-impacts': An Electrochemical Technique for Nanoparticle Sizing in Optically Opaque Solutions
Her Shuang Toh1, Richard G Compton1
1Physical & Theoretical Chemistry Laboratory, Department of Chemistry, Oxford University South Parks Rd, Oxford, OX1 3QZ, UK.
Chemistryopen
|August 7, 2015
Summary
The electrochemical nano-impacts method successfully detected and sized silver nanoparticles in opaque, particle-filled solutions. This technique overcomes limitations of laser-based methods like NTA and DLS in challenging sample matrices.
Area of Science:
- Electrochemistry
- Nanotechnology
- Materials Science
Background:
- Laser-dependent nanoparticle analysis methods (NTA, DLS) fail in optically opaque media.
- Light scattering and absorption by particulates prevent nanoparticle detection.
- A need exists for nanoparticle characterization in complex, non-transparent suspensions.
Purpose of the Study:
- To demonstrate the efficacy of the electrochemical nano-impacts technique.
- To detect and size nanoparticles within an optically opaque medium.
- To compare nano-impacts results with established ex situ methods.
Main Methods:
- Utilized the electrochemical nano-impacts technique.
- Employed a model opaque medium with high alumina particulate levels.
- Validated results using transmission electron microscopy (TEM).
Main Results:
- Successfully detected and sized silver nanoparticles in a milky white suspension.
- Nano-impacts results showed good agreement with TEM measurements.
- Demonstrated nanoparticle detection in a matrix unsuitable for NTA and DLS.
Conclusions:
- The electrochemical nano-impacts method is effective for nanoparticle detection in opaque media.
- This technique offers a significant advantage over optical methods in challenging sample environments.
- Provides a viable in situ alternative for nanoparticle characterization.
