期刊
REACTIVE & FUNCTIONAL POLYMERS
卷 179, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.reactfunctpolym.2022.105363
关键词
Phenol-formaldehyde resin (PFR); Fractal dimension; DLVO; Aggregation; Hydration
资金
- Ministry of Science and Technology of the People's Republic of China, Special Project on Innovative Methods Fund Program [2020IM030400]
- Natural Science Foundation of China [2020IM030400, 21664009, 51063003]
The study found that divalent metal cations with poor hydration, such as Mg2+, promote aggregation more than those with good hydration, such as Ca2+. The hydrated differences of ions can be quantitatively explained by the introduction of Lewis acid-base interaction in the improved DLVO theory. This reveals the important significance of ion specificity in the aggregation behavior of PFR colloids.
In recent years, phenol-formaldehyde resin (PFR) as a colloid plugging agent was extensively used in enhanced oil recovery. It has been popularly concerned that the influence of environment on the structure, migration and aggregation behavior of PFR. The classical Derjaguin-Landau-Verwey-Overbeek (DLVO) theory can explain the interaction potential between particles. However, the classical DLVO cannot explain differences when colloids aggregate in the same valence metal cation solution. In this work, the effects of ion specificity of divalent metal cations (i. e., Mg2 + and Ca2 +) on the aggregation rate, fractal dimension, zeta potential and the critical coagulation concentration (CCC) of PFR were systematically studied by dynamic light scattering experiment, electrophoretic light scattering and spectral turbidimetry. The experimental results showed that metal cations with poor hydration (i. e., Mg2 +) can promote aggregation more than metal cations with good hydration (i. e., Ca2 +). The hydrated differences of ions can be explained quantitatively by the improved DLVO theory intro-ducing Lewis acid-base interaction. This result revealed the important significance of ion specificity in the ag-gregation behavior of PFR colloids, and made it possible to understand the co-transport process of PFR aggregates and metal cations in reservoirs. Thus, it is possible to precisely control the aggregation rate and the fractal dimension of PFR aggregates.
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