tailieunhanh - The Temperature Dependence of the Zeta Potential in Porous Media

The measurements of the zeta potential of five consolidated samples including natural and artificial ceramic rocks saturated with ×10-3 M NaCl electrolyte at different temperatures have been reported. The zeta potential obtained in this work is always negative and increases in magnitude with increasing temperature for all samples (an average increase of the zeta potential of mV/ oC in magnitude). | VNU Journal of Science: Mathematics – Physics, Vol. 33, No. 4 (2017) 57-66 The Temperature Dependence of the Zeta Potential in Porous Media Luong Duy Thanh* Thuy Loi University, 175 Tay Son, Dong Da, Hanoi, Vietnam Received 03 March 2017 Revised 20 April 2017; Accepted 28 April 2017 Abstract: The measurements of the zeta potential of five consolidated samples including natural and artificial ceramic rocks saturated with ×10 -3 M NaCl electrolyte at different temperatures have been reported. The zeta potential obtained in this work is always negative and increases in magnitude with increasing temperature for all samples (an average increase of the zeta potential of mV/ oC in magnitude). The experimental results are in good agreement with previously published data. The experimental data is then explained by a theoretical model. It is shown that the model is able to reproduce the main trend of the experimental data from our work and from published articles. Keywords: Streaming potential, zeta potential, porous media, rocks, temperature. 1. Introduction Streaming potential plays an important role in geophysical applications. For example, the streaming potential is used to map subsurface flow and detect subsurface flow patterns in oil reservoirs [1]. Streaming potential is also used to monitor subsurface flow in geothermal areas and volcanoes [2, 3]. Monitoring of streaming potential anomalies has been proposed as a means of predicting earthquakes [4, 5] and detecting of seepage through water retention structures such as dams, dikes, reservoir floors, and canals [6]. The zeta potential is one of the key parameters in streaming potential. The zeta potential of liquid-rock systems depends on many parameters such as mineral composition of rocks, fluid properties, fluid pH, fluid temperature etc. To quantitatively estimate self-potential anomalies generated by electrokinetics in hydrothermal areas, understanding of the variation of the zeta potential with .