Display options
Cite
Williams TA, Lee J, Diemler CA, et al. Magnetic vs. non-magnetic colloids - A comparative adsorption study to quantify the effect of dye-induced aggregation on the binding affinity of an organic dye. J Colloid Interface Sci. 2016;481:20-7doi: 10.1016/j.jcis.2016.07.038.
Williams, T. A., Lee, J., Diemler, C. A., & Subir, M. (2016). Magnetic vs. non-magnetic colloids - A comparative adsorption study to quantify the effect of dye-induced aggregation on the binding affinity of an organic dye. Journal of colloid and interface science, 48120-7. https://doi.org/10.1016/j.jcis.2016.07.038
Williams, Tyler A, et al. "Magnetic vs. non-magnetic colloids - A comparative adsorption study to quantify the effect of dye-induced aggregation on the binding affinity of an organic dye." Journal of colloid and interface science vol. 481 (2016): 20-7. doi: https://doi.org/10.1016/j.jcis.2016.07.038
Williams TA, Lee J, Diemler CA, Subir M. Magnetic vs. non-magnetic colloids - A comparative adsorption study to quantify the effect of dye-induced aggregation on the binding affinity of an organic dye. J Colloid Interface Sci. 2016 Nov 01;481:20-7. doi: 10.1016/j.jcis.2016.07.038. Epub 2016 Jul 18. PMID: 27450888.
Copy Download .nbib Format: NLM
Share it on

J Colloid Interface Sci. 2016 Nov 01;481:20-7. doi: 10.1016/j.jcis.2016.07.038. Epub 2016 Jul 18.

Magnetic vs. non-magnetic colloids - A comparative adsorption study to quantify the effect of dye-induced aggregation on the binding affinity of an organic dye.

Journal of colloid and interface science

Tyler A Williams, Jenny Lee, Cory A Diemler, Mahamud Subir

Affiliations

  1. Department of Chemistry, Ball State University, 2000 W. University Avenue, Muncie, IN 47306, USA. Electronic address: [email protected].
  2. Department of Chemistry, Ball State University, 2000 W. University Avenue, Muncie, IN 47306, USA. Electronic address: [email protected].
  3. Department of Chemistry, Ball State University, 2000 W. University Avenue, Muncie, IN 47306, USA. Electronic address: [email protected].
  4. Department of Chemistry, Ball State University, 2000 W. University Avenue, Muncie, IN 47306, USA. Electronic address: [email protected].

PMID: 27450888 DOI: 10.1016/j.jcis.2016.07.038

Abstract

HYPOTHESIS: Due to attractive magnetic forces, magnetic particles (MPs) can exhibit colloidal instability upon molecular adsorption. Thus, by comparing the dye adsorption isotherms of MPs and non-magnetic particles of the same size, shape and functional group it should be possible to characterize the influence of magnetic attraction on MP aggregation.

EXPERIMENTS: For a range of particle densities, a comparative adsorption study of malachite green (MG(+)) onto magnetic and non-magnetic colloids was carried out using a combination of a separation technique coupled with UV-vis spectroscopy, optical microscopy, and polarization dependent second harmonic generation (SHG) spectroscopy.

FINDINGS: Significant MP aggregation occurs in aqueous solution due to MG(+) adsorption. This alters the adsorption isotherm and challenges the determination of the adsorption equilibrium constant, Kads. The dye-induced aggregation is directly related to the MG(+) concentration, [MG(+)]. A modified Langmuir equation, which incorporates loss of surface sites due to this aggregation, accurately describes the resulting adsorption isotherms. The Kads of 1.1 (±0.3)×10(7) and a loss of maximum MP surface capacity of 2.8 (±0.7)×10(3)M(-1) per [MG(+)] has been obtained. Additionally, SHG has been established as an effective tool to detect aggregation in nanoparticles.

Copyright © 2016 Elsevier Inc. All rights reserved.

Keywords: Adsorption isotherm; Aggregation detection; Magnetic nanoparticle; Nanotechnology; Pollution remediation; SHG spectroscopy

Publication Types