Measuring the Hydrodynamic Size of Nanoparticles Using Fluctuation Correlation Spectroscopy

Area of Science:

• Analytical Chemistry
• Materials Science
• Biophysics

Background:

• Fluctuation Correlation Spectroscopy (FCS) is a powerful technique for studying molecular dynamics in solutions and living cells.
• Traditionally, FCS monitors diffusion, reaction kinetics, and intracellular processes.

Purpose of the Study:

• This review highlights the emerging application of FCS for determining the size of colloidal nanoparticles in solution.
• It explores the theoretical underpinnings, experimental setup, and practical considerations of using FCS for nanoparticle characterization.

Main Methods:

• The review covers the theoretical framework of FCS relevant to nanoparticle analysis.
• Experimental implementation details for applying FCS to nanoparticle systems are discussed.
• Advantages and limitations of FCS for this application are critically evaluated.

Main Results:

• FCS successfully measures the size of gold nanoparticles in solution.
• The technique is employed to monitor the rotational dynamics of gold nanorods.
• FCS is utilized to investigate the formation of protein coronas on nanoparticle surfaces.

Conclusions:

• FCS offers a versatile and effective approach for characterizing colloidal nanoparticles.
• This technique provides valuable insights into nanoparticle size, dynamics, and interactions in biological environments.
• FCS is a promising tool for advancing nanoparticle research in various scientific fields.