Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 424, Issue -, Pages 120-123Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2014.03.003
Keywords
Diffusiophoresis; Electroneutrality; Multi-ion diffusiophoresis
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Funding
- National Science Foundation through IDR [CBET 1014673]
- MRSEC [DMR-08-20404]
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The movement of charged particles occurs in a salt concentration gradient by the mechanism of diffusiophoresis. Current analytical models for diffusiophoresis have been developed for a gradient generated by a symmetric Z:Z electrolyte at steady state. Recently, our lab has reported diffusioosmotic flows due to dissolving calcium carbonate (CaCO3) which generates three ions (Ca2+, HCO3-, and OH-), and this fluid motion cannot be described by current analytical models. In this communication, we derive an expression for the diffusioosmotic flow in a gradient involving multiple ions of different valences, assuming infinitesimally thin double layers. We also solve numerically the time-dependent concentration profiles for the three-ion case and find that the concentration profile of HCO3- is non-monotonic in solution. Finally, we examine quantitatively the assumption of electroneutrality in solution, finding that electroneutrality is a good approximation even for the multi-ion case, indicating that our electric field derived from the ion migration equation is quite accurate. (C) 2014 Published by Elsevier Inc.
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