Direct observation of the formation and destruction of the inverted continuous oil phase in the micro-outlet region achieved by the confined diluted O/W emulsion stream

We demonstrate a direct observation of the oil-in-water (O/W) emulsion droplets in a confined point contact geometry, to shed new light on the mechanism of the interaction between emulsion and solid surfaces under confinement.

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Direct Observation of Splitting in Oil-In-Water-In-Oil Emulsion Droplets via a Microchannel Mimicking Membrane Pores

Langmuir ◽

10.1021/acs.langmuir.7b03331 ◽

2017 ◽

Vol 33 (49) ◽

pp. 14087-14092 ◽

Cited By ~ 6

Author(s):

Kazuki Akamatsu ◽

Koki Minezaki ◽

Masumi Yamada ◽

Minoru Seki ◽

Shin-ichi Nakao

Keyword(s):

Direct Observation ◽

Oil Emulsion ◽

Membrane Pores ◽

Emulsion Droplets ◽

Oil In Water ◽

Water In Oil Emulsion

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Direct observation of adhesion and spreading of emulsion droplets at solid surfaces

Soft Matter ◽

10.1039/b718891a ◽

2008 ◽

Vol 4 (5) ◽

pp. 1079 ◽

Cited By ~ 40

Author(s):

Diane M. Dresselhuis ◽

George A. van Aken ◽

Els H. A. de Hoog ◽

Martien A. Cohen Stuart

Keyword(s):

Direct Observation ◽

Solid Surfaces ◽

Emulsion Droplets

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Direct observation on the behaviour of emulsion droplets and formation of oil pool under point contact

Applied Physics Letters ◽

10.1063/1.4770382 ◽

2012 ◽

Vol 101 (24) ◽

pp. 241603 ◽

Cited By ~ 6

Author(s):

Liran Ma ◽

Chenhui Zhang ◽

Jianbin Luo

Keyword(s):

Direct Observation ◽

Point Contact ◽

Emulsion Droplets ◽

Oil Pool

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An Oligoimide Particle as a Pickering Emulsion Stabilizer

Polymers ◽

10.3390/polym10101071 ◽

2018 ◽

Vol 10 (10) ◽

pp. 1071 ◽

Cited By ~ 3

Author(s):

Yu-Jin Cho ◽

Dong-Min Kim ◽

In-Ho Song ◽

Ju-Young Choi ◽

Seung-Won Jin ◽

...

Keyword(s):

Particle Concentration ◽

Pickering Emulsion ◽

Pickering Emulsions ◽

Step Method ◽

Wetting Properties ◽

Emulsion Droplets ◽

Step Procedure ◽

Oil In Water ◽

One Step ◽

Oil Emulsions

A pyromellitic dianhydride (PMDA) and 4,4′-oxydianiline (ODA)-based oligoimide (PMDA-ODA) was synthesized by a one-step procedure using water as a solvent. The PMDA-ODA particles showed excellent partial wetting properties and were stably dispersed in both water and oil phases. A stable dispersion was not obtained with comparison PMDA-ODA particles that were synthesized by a conventional two-step method using an organic solvent. Both oil-in-water and water-in-oil Pickering emulsions were prepared using the oligoimide particles synthesized in water, and the size of the emulsion droplet was controlled based on the oligoimide particle concentration. The oligoimide particles were tested to prepare Pickering emulsions using various kinds of oils. The oil-in-water Pickering emulsions were successfully applied to prepare microcapsules of the emulsion droplets. Our new Pickering emulsion stabilizer has the advantages of easy synthesis, no need for surface modification, and the capability of stabilizing both oil-in-water and water-in-oil emulsions.

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Pore-Scale Transport Mechanisms and Macroscopic Displacement Effects of In-Situ Oil-in-Water Emulsions in Porous Media

Journal of Energy Resources Technology ◽

10.1115/1.4040200 ◽

2018 ◽

Vol 140 (10) ◽

Cited By ~ 8

Author(s):

Chuan Lu ◽

Wei Zhao ◽

Yongge Liu ◽

Xiaohu Dong

Keyword(s):

Porous Media ◽

Oil Recovery ◽

Heavy Oil ◽

Mobility Control ◽

Pore Scale ◽

Sweep Efficiency ◽

Emulsion Droplets ◽

Oil In Water ◽

Retention Volumes

Oil-in-water (O/W) emulsions are expected to be formed in the process of surfactant flooding for heavy oil reservoirs in order to strengthen the fluidity of heavy oil and enhance oil recovery. However, there is still a lack of detailed understanding of mechanisms and effects involved in the flow of O/W emulsions in porous media. In this study, a pore-scale transparent model packed with glass beads was first used to investigate the transport and retention mechanisms of in situ generated O/W emulsions. Then, a double-sandpack model with different permeabilities was used to further study the effect of in situ formed O/W emulsions on the improvement of sweep efficiency and oil recovery. The pore-scale visualization experiment presented an in situ emulsification process. The in situ formed O/W emulsions could absorb to the surface of pore-throats, and plug pore-throats through mechanisms of capture-plugging (by a single emulsion droplet) and superposition-plugging or annulus-plugging (by multiple emulsion droplets). The double-sandpack experiments proved that the in situ formed O/W emulsion droplets were beneficial for the mobility control in the high permeability sandpack and the oil recovery enhancement in the low permeability sandpack. The size distribution of the produced emulsions proved that larger pressures were capable to displace larger O/W emulsion droplets out of the pore-throat and reduce their retention volumes.

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