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Harikrishnan AR, Dhar P, Gedupudi S, et al. Effect of Interaction of Nanoparticles and Surfactants on the Spreading Dynamics of Sessile Droplets. Langmuir. 2017;33(43):12180-12192doi: 10.1021/acs.langmuir.7b02123.
Harikrishnan, A. R., Dhar, P., Gedupudi, S., & Das, S. K. (2017). Effect of Interaction of Nanoparticles and Surfactants on the Spreading Dynamics of Sessile Droplets. Langmuir : the ACS journal of surfaces and colloids, 33(43), 12180-12192. https://doi.org/10.1021/acs.langmuir.7b02123
Harikrishnan, A R, et al. "Effect of Interaction of Nanoparticles and Surfactants on the Spreading Dynamics of Sessile Droplets." Langmuir : the ACS journal of surfaces and colloids vol. 33,43 (2017): 12180-12192. doi: https://doi.org/10.1021/acs.langmuir.7b02123
Harikrishnan AR, Dhar P, Gedupudi S, Das SK. Effect of Interaction of Nanoparticles and Surfactants on the Spreading Dynamics of Sessile Droplets. Langmuir. 2017 Oct 31;33(43):12180-12192. doi: 10.1021/acs.langmuir.7b02123. Epub 2017 Oct 18. PMID: 28982242.
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Langmuir. 2017 Oct 31;33(43):12180-12192. doi: 10.1021/acs.langmuir.7b02123. Epub 2017 Oct 18.

Effect of Interaction of Nanoparticles and Surfactants on the Spreading Dynamics of Sessile Droplets.

Langmuir : the ACS journal of surfaces and colloids

A R Harikrishnan, Purbarun Dhar, Sateesh Gedupudi, Sarit K Das

Affiliations

  1. Department of Mechanical Engineering, Indian Institute of Technology Madras , Chennai-600036, India.
  2. Department of Mechanical Engineering, Indian Institute of Technology Ropar , Rupnagar-140001, India.

PMID: 28982242 DOI: 10.1021/acs.langmuir.7b02123

Abstract

While a body of literature on the spreading dynamics of surfactants and a few studies on the spreading dynamics of nanocolloids exist, to the best of the authors' knowledge, there are no reports on the effect of presence of surfactants on the spreading dynamics of nanocolloidal suspensions. For the first time the present study reports an extensive experimental and theoretical study on the effect of surfactant impregnated nanocolloidal complex fluids in modulating the spreading dynamics. A segregation analysis of the effect of surfactants alone, nanoparticle alone, and the combined effect of nanoparticle and surfactants in altering the spreading dynamics have been studied in detail. The spreading dynamics of nanocolloidal solutions alone and of the surfactant impregnated nanocolloidal solutions are found to be grossly different, and particle morphology is found to play a predominant role. For the first time the present study experimentally proves that the classical Tanner's law is disobeyed by the complex fluids in the case of particle alone and combined particle and surfactant case. We also discuss the role of imbibitions across the particle wedge in the precursor film in tuning spreading dynamics. We propose an analytical model to predict the nature of dependency of contact radius on time for the complex colloids. A detailed theoretical examination of the governing factors, the interacting forces at the three phase contact line, and the effects of interplay of surfactants and the nanoparticles at the precursor film in modulating the spreading dynamics has been presented for such complex colloids.

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