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Influence of temperature and particle concentration on the pH of complex nanocolloids

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Abstract

The pH of colloids is an important electrokinetic property which determines phase stability. We report the effect of temperature and nanoparticle concentration on pH of different nanocolloids of nanomaterials of varied morphologies and sizes. Measurements over a temperature range show that the pH of nanocolloids is a strong function of temperature and the concentration of the dispersed phase. Charge transport mechanisms leading to changes in the effective proton population are discussed. The mannerism in which the electric double layer (EDL) at the particle-fluid interface affects the pH of nanocolloids is presented by appealing to the DLVO theory of electrokinetics dispersion.

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Acknowledgements

The authors are thankful to the Sophisticated Analytical Instruments Facility (SAIF), IIT Madras for material characterizations. AK is also thankful to the Director, Research and Innovation Centre (DRDO), Chennai, for giving permission to publish the present work. ARH would like to thank MHRD, Govt. of India, for his doctoral scholarship. Authors acknowledge the Defence Research and Development Organization (DRDO) of India for funding of the present work (Grant no. ERIP/ER/RIC/2013/M/01/2194/D (R&D)).

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  1. Ajay Katiyar and A. R. Harikrishnan both authors contributed equally to this work.

Authors and Affiliations

  1. Research and Innovation Centre (DRDO), IIT Madras Research Park, Chennai, 600113, India

    Ajay Katiyar

  2. Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai, 600036, India

    A. R. Harikrishnan

  3. Department of Mechanical Engineering, Indian Institute of Technology Ropar, Rupnagar, 140001, India

    Purbarun Dhar

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  1. Ajay Katiyar
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  2. A. R. Harikrishnan
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  3. Purbarun Dhar
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Correspondence to Ajay Katiyar or Purbarun Dhar.

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Katiyar, A., Harikrishnan, A.R. & Dhar, P. Influence of temperature and particle concentration on the pH of complex nanocolloids. Colloid Polym Sci 295, 1575–1583 (2017). https://doi.org/10.1007/s00396-017-4132-7

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  • DOI: https://doi.org/10.1007/s00396-017-4132-7

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