Studies on bitumen-silica interaction in surfactants and divalent cations solutions by atomic force microscopy

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	Studies on bitumen-silica interaction in surfactants and divalent cations solutions by atomic force microscopy
	Zhang Y(张燕)1,2,3 ; Ding MS(丁明山)1,2 ; Liu J(刘娟)1,2 ; Jia WH(贾卫红)1 ; Ren SL(任嗣利)1
刊名	Colloids and Surfaces A: Physicochemical and Engineering Aspects
	2015
卷号	482 页码:241-247
关键词	Oil sands Atomic force microscope Surfactants Divalent metal ions DLVO theory Surface wettability
ISSN号	0927-7757
通讯作者	任嗣利
英文摘要	Synergistic effects of surfactants and divalent metal ions on bitumen–silica interaction were investigated in various pH solutions by using atomic force microscope (AFM). Zeta potential measurements were carried out and the extended DLVO theory was employed to interpret the bitumen–silica interaction behaviors. The AFM force measurements showed that the presence of cationic surfactant of dodecyltrimethylammonium chloride (DTAC) caused a strong long-range attractive force and high adhesive force, which were considerably reduced as divalent metal ions of Ca²⁺ or Mg²⁺ added in the acid solutions. However, the long-range repulsive force changed to attractive force compounded with a relative high adhesion when both the anionic surfactant of sodium dodecylbenzene sulfonate (SDBS) and divalent metal ions of Ca²⁺ or Mg²⁺ presented in the alkaline solution. Mechanism on bitumen–silica interaction behaviors at various conditions was discussed. It was suggested that changes of surface wettability arising from the adsorption of surfactants on silica and bitumen surfaces were responsible for the variation of the bitumen–silica interactions. The preferential adsorption of the divalent metal ions of Ca²⁺ or Mg²⁺ on silica and bitumen surfaces acted as either a barrier to prevent the cationic surfactants from adsorbing or a bridge to anchor the anionic surfactants. The generation of the hydrophobic attraction between bitumen and silica was supported by the extended DLVO theory. It is believed that the findings in this work have a guideline of controlling the oilsands processing condition to obtain a high bitumen recovery and good froth quality.
学科主题	物理化学与绿色催化
收录类别	SCI
资助信息	the National Natural Science Foundation of China (Grant No. 51374195);the “Top Hundred Talents Program” held by the Chinese Academy of Sciences
语种	英语
WOS记录号	WOS:000360411300028
内容类型	期刊论文
源URL	[http://210.77.64.217/handle/362003/18586]
专题	兰州化学物理研究所_OSSO国家重点实验室兰州化学物理研究所_固体润滑国家重点实验室
作者单位	1.Chinese Acad Sci, Lanzhou Inst Chem Phys, State Key Lab Solid Lubricat, Lanzhou 730000, Peoples R China 2.Univ Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China 3.Lanzhou Jiaotong Univ, Sch Traff & Transportat, Lanzhou 730070, Peoples R China
推荐引用方式 GB/T 7714	Zhang Y,Ding MS,Liu J,et al. Studies on bitumen-silica interaction in surfactants and divalent cations solutions by atomic force microscopy[J]. Colloids and Surfaces A: Physicochemical and Engineering Aspects,2015,482:241-247.
APA	Zhang Y,Ding MS,Liu J,Jia WH,&Ren SL.(2015).Studies on bitumen-silica interaction in surfactants and divalent cations solutions by atomic force microscopy.Colloids and Surfaces A: Physicochemical and Engineering Aspects,482,241-247.
MLA	Zhang Y,et al."Studies on bitumen-silica interaction in surfactants and divalent cations solutions by atomic force microscopy".Colloids and Surfaces A: Physicochemical and Engineering Aspects 482(2015):241-247.