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Alkschbirs MI, Bizotto VC, de Oliveira MG, et al. Effects of Congo red on the drag reduction properties of poly(ethylene oxide) in aqueous solution based on drop impact images. Langmuir. 2004;20(26):11315-20doi: 10.1021/la0489007.
Alkschbirs, M. I., Bizotto, V. C., de Oliveira, M. G., & Sabadini, E. (2004). Effects of Congo red on the drag reduction properties of poly(ethylene oxide) in aqueous solution based on drop impact images. Langmuir : the ACS journal of surfaces and colloids, 20(26), 11315-20. https://doi.org/10.1021/la0489007
Alkschbirs, Melissa I, et al. "Effects of Congo red on the drag reduction properties of poly(ethylene oxide) in aqueous solution based on drop impact images." Langmuir : the ACS journal of surfaces and colloids vol. 20,26 (2004): 11315-20. doi: https://doi.org/10.1021/la0489007
Alkschbirs MI, Bizotto VC, de Oliveira MG, Sabadini E. Effects of Congo red on the drag reduction properties of poly(ethylene oxide) in aqueous solution based on drop impact images. Langmuir. 2004 Dec 21;20(26):11315-20. doi: 10.1021/la0489007. PMID: 15595752.
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Langmuir. 2004 Dec 21;20(26):11315-20. doi: 10.1021/la0489007.

Effects of Congo red on the drag reduction properties of poly(ethylene oxide) in aqueous solution based on drop impact images.

Langmuir : the ACS journal of surfaces and colloids

Melissa I Alkschbirs, Vanessa C Bizotto, Marcelo G de Oliveira, Edvaldo Sabadini

Affiliations

  1. Instituto de Química, Universidade Estadual de Campinas, Caixa Postal 6154, CEP 13084-862, Campinas, SP, Brazil.

PMID: 15595752 DOI: 10.1021/la0489007

Abstract

The presence of very small amounts (ppm) of high-MW polymers in solution produces high levels of drag reduction in a turbulent flow. This phenomenon, often termed as the Toms effect, is highly dependent not only on MW, but also on the flexibility of the macromolecular chain. The Toms effect can be studied through the images of the structures produced after the drop impact against shallow solution surfaces. The splash structures composed of crown, cavity, and Rayleigh jet are highly dependent on the elongational properties of the solution. This work presents the effects of Congo red on the drag reduction properties of poly(ethylene oxide) in aqueous solutions through the analysis of splash structures. Results obtained in this analysis indicate that Congo red molecules act as physical cross-linking agents, decreasing the polymer elasticity and its drag reduction capacity. It was observed that the maximum height of the Rayleigh jet can be used as a sensitive parameter to the complexation between the dye and the polymer molecules.

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