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Journal of Analytical Chemistry

, Volume 73, Issue 7, pp 641–649 | Cite as

Determination of Adsorbates on the Surface of Polymer with Low Absorption Capacity by Thermal Lens Spectrometry

  • D. A. Nedosekin
  • I. V. Mikheev
  • D. S. Volkov
  • M. A. ProskurninEmail author
Articles
  • 33 Downloads

Abstract

Thermal lens spectrometry in a coaxial configuration is used for the direct determination of adsorbates on a planar surface of polyethylene terephthalate (PET). A possibility of the direct measurement of the rate of adsorption from solutions and the determination of the parameters of the adsorbed layer is demonstrated by the example of an investigation of the adsorption of iron(II) tris(1,10-phenantrolinate) on a PET surface. The adsorption isotherm of iron(II) tris(1,10-phenantrolinate) on the PET surface is described by the Langmuir equation and is linear in the concentration range in solution from 0.02 to 0.7 mM. The method for calculating the thermal perturbation in surface-absorbing solids was used to interpret the results of the adsorption study, and a possibility of determining iron(II) tris(1,10-phenantrolinate) on the surface at a level smaller than a monolayer was shown. Thermal lens spectrometry enables the determination of the absorption of the surface layer at a level up to 5 × 10–5 absorbance units, which corresponds to the surface concentration of iron(II) tris(1,10-phenanthrolinate) 2 × 10–13 mol/cm2. Using the example of the adsorption of 4-(2-pyridylazo) resorcinol on the PET surface, it is demonstrated that, in the case of strong absorption of the surface layer, the thermal destruction of substance and the deformation of the substrate may occur. A local increase in temperature in the layer is also confirmed by theoretical calculations.

Keywords

thermal lens spectrometry spectrophotometry 

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Copyright information

© Pleiades Publishing, Ltd. 2018

Authors and Affiliations

  • D. A. Nedosekin
    • 1
  • I. V. Mikheev
    • 2
  • D. S. Volkov
    • 2
  • M. A. Proskurnin
    • 2
    Email author
  1. 1.Arkansas Nanomedicine CenterUniversity of Arkansas for Medical SciencesLittle RockUnited States
  2. 2.Department of ChemistryMoscow State UniversityMoscowRussia

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