Dilational Viscoelastic Properties of Water-Fuel Interfaces in Single and Binary Surfactant Systems

doi:10.1021/acs.energyfuels.9b00517

	Dilational Viscoelastic Properties of Water-Fuel Interfaces in Single and Binary Surfactant Systems
	Zhang, Qian 1,2; Li, Yanxiang 2; Cao, Lixia 2; Li, Lei 2; Huang, Kun 3; Li, Wangliang 2; Yang, Chuanfang 2,4
刊名	ENERGY & FUELS
	2019-09-01
卷号	33 期号:9 页码:9055-9066
ISSN号	0887-0624
DOI	10.1021/acs.energyfuels.9b00517
英文摘要	The interfacial rheology of a surfactant film surrounding a water-in-oil emulsion influences the stability of the emulsion significantly. In this research, we chose monoolein of molecular weight of 356.54 and pentaerythritol oleate (PETO-B) of molecular weight of 1193.93 as the surfactants and dissolved them in clay-treated ultralow sulfur diesel fuel separately and together to mimic single and binary surfactant systems. The water/fuel interfacial viscoelastic properties were then studied using the oscillation pendant drop method subject to different surfactant concentrations and oscillation frequencies. Surfactant coverage on the interface and the surfactant molecule migration rate were calculated to investigate the viscoelastic phenomenon of the surfactant film. The migration rate of surfactant in the bulk was found to be crucial for the surfactant to effectively compensate the interfacial tension (IFT) gradient caused by interfacial area expansion and compression. Faster moving monoolein molecules could rapidly compensate the IFT gradient as oscillation was triggered, resulting in much higher elastic modulus in comparison to PETO-B molecules with lower migration rate. Higher surfactant concentration also produced faster migration rate resulting in a higher film elastic modulus. Lower oscillation frequency promoted the formation of a film with lower elasticity and higher viscous modulus, while higher oscillation frequency led to lower film viscous modulus. The calculated occupying area per surfactant molecule on the interface indicated that monoolein had a much tighter arrangement at the interface than PETO-B. The binary surfactant system was constructed with monoolein and PETO-B with various weight ratios. The interfacial rheology of such a system was determined by the faster migrating surfactant that built the fundamental framework of the film and adding PETO-B to monoolein-containing fuel could therefore decrease the interfacial elastic modulus and, hence, the emulsion's stability, to benefit emulsified water separation.
资助项目	National Key Research and Development Program of China[2017YFB0308000] ; National Natural Science Foundation of China[21476237]
WOS关键词	ADSORPTION-KINETICS ; IONIZED MONOLAYERS ; RHEOLOGY ; COALESCENCE ; PREDICTION ; ABSORPTION ; SEPARATION ; HEATS ; AREA ; OIL
WOS研究方向	Energy & Fuels ; Engineering
语种	英语
出版者	AMER CHEMICAL SOC
WOS记录号	WOS:000487178700109
资助机构	National Key Research and Development Program of China ; National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.ipe.ac.cn/handle/122111/30969]
专题	中国科学院过程工程研究所
通讯作者	Huang, Kun; Li, Wangliang; Yang, Chuanfang
作者单位	1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Inst Proc Engn, CAS Key Lab Green Proc & Engn, Beijing 100190, Peoples R China 3.Univ Sci & Technol Beijing, Sch Met & Ecol Engn, Beijing 100083, Peoples R China 4.17368 Rosalla Dr, Eden Prairie, MN 55346 USA
推荐引用方式 GB/T 7714	Zhang, Qian,Li, Yanxiang,Cao, Lixia,et al. Dilational Viscoelastic Properties of Water-Fuel Interfaces in Single and Binary Surfactant Systems[J]. ENERGY & FUELS,2019,33(9):9055-9066.
APA	Zhang, Qian.,Li, Yanxiang.,Cao, Lixia.,Li, Lei.,Huang, Kun.,...&Yang, Chuanfang.(2019).Dilational Viscoelastic Properties of Water-Fuel Interfaces in Single and Binary Surfactant Systems.ENERGY & FUELS,33(9),9055-9066.
MLA	Zhang, Qian,et al."Dilational Viscoelastic Properties of Water-Fuel Interfaces in Single and Binary Surfactant Systems".ENERGY & FUELS 33.9(2019):9055-9066.