Determining Number Concentrations and Diameters of Polystyrene Particles by Measuring the Effective Refractive Index of Colloids Using Surface Plasmon Resonance
Artikel i vetenskaplig tidskrift, 2016

The capabilities of surface plasmon resonance (SPR) for characterization of colloidal particles were evaluated for 100, 300, and 460 nm nominal diameter polystyrene (PS) latexes. First the accuracy of measuring the effective refractive index (n(eff)) of turbid colloids using SPR was quantified. It was concluded that for submicrometer sized PS particles the accuracy is limited by the reproducibility between replicate injections of samples. An SPR method was developed for obtaining the particle mean diameter (d(part)) and the particle number concentration (c(p)) by fitting the measured n(eff) of polystyrene (PS) colloids diluted in series with theoretical values calculated using the coherent scattering theory (CST). The d(part) and c(p) determined using SPR agreed with reference values obtained from size distributions measured by scanning electron microscopy (SEM), and the mass concentrations stated by the manufacturer. The 100 nm particles adsorbed on the sensing surface, which hampered the analysis. Once the adsorption problem has been overcome, the developed SPR method has potential to become a versatile tool for characterization of colloidal particles. In particular, SPR could form the basis of rapid and accurate methods for measuring the c(p) of submicrometer particles in dispersion.

SCATTERING

DEPENDENT

OPTICAL-PROPERTIES

SYSTEM

SIZE

LIGHT-SCATTERING

TOOL

RADIATIVE-TRANSFER

NANOPARTICLE TRACKING ANALYSIS

SUSPENSION

Författare

Jani Tuoriniemi

Göteborgs universitet

Beatriz Moreira

Göteborgs universitet

Gulnara Safina

Göteborgs universitet

Chalmers, Fysik, Biologisk fysik

Langmuir

0743-7463 (ISSN) 1520-5827 (eISSN)

Vol. 32 10632-10640

Ämneskategorier

Fysikalisk kemi

DOI

10.1021/acs.langmuir.6b02684