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Anomalous Change of Refractive Index for Au Sols Under Laser Illumination

  • Yuliia Harahuts
  • Valeriy Pavlov
  • Elena Mokrinskaya
  • Irina Davidenko
  • Nikolay Davidenko
  • Nataliya Kutsevol
  • Ihor Pampukha
  • Victor Martynyuk
Conference paper
Part of the Springer Proceedings in Physics book series (SPPHY, volume 222)

Abstract

The comparative refractive index analysis for two systems, Au sol synthesized into solution of dextran-graft-polyacrylamide (D-g-PAA) starlike copolymer and solution of D-g-PAA under laser illumination, has been carried out. It was established that Au nanoparticles (AuNPs) are 1.5–6 nm in size. The size of individual polymer molecule in solution was equal to 50–60 nm. Au/D-g-PAA nanosystem was successfully used as nanocarrier for photodynamic anticancer therapy.

To understand the effect of laser illumination on Au sol, the method of holographic interferometry in real time was proposed and experimentally applied. The method is tested using the equipment kit to determine the refractive index (n) and its change (Δn) of liquid and gaseous media. The necessity of such research is determined by the problems existing in practical medicine.

To explain the experimental results, a phenomenological model is proposed which takes into account the features of the molecular structure of starlike dextran-graft-polyacrylamide copolymer with incorporated Au nanoparticles. Since under illumination with light with λirr = 650 nm the variation of n is observed mainly in the small volume of the cell near the laser beam transmission region, and thermal diffusion into the non-illuminated volume is practically absent, these nanosystems could be effective in target photothermal therapy.

Keywords

Gold nanoparticles Star-like copolymer Dextran-graft-polyacrylamide The holographic interferometry technique Photodynamic anticancer therapy Photothermal therapy 

Notes

Acknowledgments

With the support of the Military and Research Directorate of the General Staff of the Armed Forces of Ukraine.

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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  • Yuliia Harahuts
    • 1
  • Valeriy Pavlov
    • 1
  • Elena Mokrinskaya
    • 1
  • Irina Davidenko
    • 1
  • Nikolay Davidenko
    • 1
  • Nataliya Kutsevol
    • 1
  • Ihor Pampukha
    • 1
  • Victor Martynyuk
    • 1
  1. 1.Taras Shevchenko National University of KyivKyivUkraine

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