Influence of temperature and particle concentration on the pH of complex nanocolloids
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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.
KeywordsNanofluids pH Temperature Concentration Electric double layer DLVO theory
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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Conflict of interest statement
The authors declare that they have no conflict of interest.
- 1.S.U.S. Choi, ASME, FED-vol. 231/MD-vol. 66. New York, (1995), p. 99.Google Scholar
- 4.J.A. Eastman, U.S. Choi, S. Li, L.J. Thompson, S. Lee, 1996 Fall Meeting of the materials research society, Boston, 2–6 December 1996 MRS, Pittsburgh, 1996, p. 1.Google Scholar
- 9.Wang, X. J., Zhu, D. S., and Yang, S., 470(1–3), (2009), pp. 107–111.Google Scholar
- 10.Huang, J., Wang, X., Long, Q., Wen, X., Zhou, Y., and Li, L. 2009, Proc. IEEE: The International Symposium on Photonics and Optoelectronics (SOPO), Wuhan, China, pp. 1–4Google Scholar
- 12.Younes, H., Christensen, G., Luan, X., Hong, H., and Smith, P., J Appl Phys, 111(6), (2012), pp. 064308–1 to 064308–7.Google Scholar
- 14.Timofeeva, E. V., Routbort, J. L., and Singh, D., J Appl Phys, 106(1), (2009), pp. 014304–1 to 014304–10.Google Scholar
- 16.Wamkam, C. T., Opoku, M. K., Hong, H., and Smith, P., J Appl Phys, 109(2), (2011) pp. 024305–1 to 024305–5.Google Scholar
- 17.Hunter RJ (1987) Foundations of colloid science, 1st edn. Clarendon, Oxford,Google Scholar