Citation: WANG Rong, DUAN Ming, XIONG Yan, SONG Xian-Yu, FANG Shen-Wen. Aggregation Behaviour of Reversed Demulsifiers SP169 and DMEA169 in Aqueous Solution[J]. Acta Physico-Chimica Sinica, ;2016, 32(6): 1482-1488. doi: 10.3866/PKU.WHXB201603153 shu

Aggregation Behaviour of Reversed Demulsifiers SP169 and DMEA169 in Aqueous Solution

Oil & Gas Field Applied Chemistry Key Laboratory of Sichuan Province, Southwest Petroleum University, Chengdu 610500, P. R. China

Received Date: 21 December 2015
Revised Date: 14 March 2016

Fund Project: The project was supported by the National Natural Science Foundation of China (21376193), Program for New Century Excellent Talents in University, China (NCET-13-0983), and Foundation of Youth Science and Technology Innovation Team of Sichuan Province, China (2015TD0007).

The critical micelle concentrations (CMCs) of the reversed demulsifiers poly(propylene oxide)-blockpoly( ethylene oxide)-block-poly(propylene oxide)(PPO-PEO-PPO), SP169, and DMEA169 were measured by steady-state fluorescence spectroscopy, with cetylpyridinium chloride (CPC) as the quencher and pyrene as the fluorescent probe. The micellar aggregation numbers (N_agg) and the polarity of the micro-environments inside the micelles were obtained for the first time. The hydrodynamic diameters of the micelles at different demulsifier concentrations were determined by dynamic light scattering (DLS) and the corresponding micelle shapes were simulated by dissipative particle dynamics (DPD). The results indicate that the critical micellar aggregation numbers (N_m) can be extrapolated from the N_agg-c_s curves, with N_m(SP169) = 28 and N_m(DMEA169) = 18. The hydrodynamic diameter of SP169 is smaller than that of DMEA169, while the acceleration of the former is faster than that of the latter. The simulations show that the micelle of SP169 is spherical while that of DMEA169 has aclavate shape, because of the different interactions resulting from the initiators among the beads. Moreover, the simulations are in good agreement with the experiments in that they find a smaller hydrodynamic diameter and a less polar micro-environment inside the micelle of SP169 compared with that of DMEA169, while the aggregation number of the former is larger than that of the latter.
- Reversed demulsifier,
- aggregation behaviour,
- Initiator,
- Dissipative particle dynamics,
- Fluorescence probe method,
- Dynamic light scattering method
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