Analysis of the Effect of TDS on the Stability of Nanoemulsified Oil

In this paper, we designed a batch experimental protocol for the effect of groundwater TDS on the stability of prepared nanoemulsified oils by artificially simulating the preparation of natural groundwater and characterizing the dynamic changes of nanoemulsified oil particle size, backscattered light flux, photon free range, and peak thickness under the influence of TDS using dynamic light dispersion and multiple light dispersion techniques, respectively. The stability of nanoemulsified oil was positively affected by TDS at 400, 600 and 1000 mg/L. The TSI increased and then decreased with the increase of TDS, and the stability of nanoemulsified oil increased by 63.70 %, 57.53 % and 15.07 % compared to the blank sample, respectively. The instability of the top instability zone of nanoemulsified oil was mainly influenced by droplet floating and aggregation, while the decrease of the volume fraction of nanoemulsified oil in the bottom instability zone caused by the influence of floating was the main reason for its instability. Compared with the blank sample, the experimental design of TDS inhibited the floating phenomenon of nanoemulsified oil and the aggregation of droplets, and gradually weakened with increasing concentration. 400 mg/L sample reduced the two instability factors by 87.5% and 87.2%, respectively. Therefore, the appropriate groundwater TDS can weaken the Brownian motion and reduce the upwelling and aggregation phenomena, which can positively affect the stability of nanoemulsified oil and facilitate the migration of nanoemulsified oil in porous media.