Crude oil/water nanoemulsions stabilized by biosurfactant: Stability and pH-Switchability

Onaizi, Sagheer A.; Alsulaimani, Mohammed; Al-Sakkaf, Mohammed K.; Bahadi, Salem A.; Mahmoud, Mohamed; Alshami, Ali

doi:10.1016/j.petrol.2020.108173

Cited by 45 publications

(22 citation statements)

References 67 publications

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“…With increasing T−DBA concentration from 0.5 wt % to 2.0 wt %, a greater amount of T−DBA covered a larger liquid paraffin-water interface during emulsification, and thus, decreased droplet size occurred. Higher emulsifier concentrations produced smaller droplet sizes [5,44,45]. Therefore, the droplet size of the emulsions decreased from approximately 2522 to 362 nm, accompanied by a narrower droplet size distribution (Figure 5).…”

Section: The Emulsification Ability Of the T−dba Surfactantmentioning

confidence: 99%

“…Responsive emulsifiers have emerged as a class of smart surfactants that permit regulating the emulsion stability under external stimuli [4][5][6][7][8]. The external stimuli include pH [9][10][11][12][13][14][15], CO 2 [6,16], temperature [17], magnetism [8], light [18,19], and redox [7,20].…”

Section: Introductionmentioning

confidence: 99%

“…Among these external stimulation types, pH has attracted particular interest because it has the advantage of being simple to regulate [11,21]. The widely studied pH-responsive emulsifiers for EOR applications are particle-based [5,22,23]. However, solid particles in the flooding fluid can cause problems, such as permanent clogging of the rock pores, particularly when these pores are small or if the particles in the utilized Pickering emulsion tend to flocculate or aggregate [5,24].…”

Section: Introductionmentioning

confidence: 99%

“…The widely studied pH-responsive emulsifiers for EOR applications are particle-based [5,22,23]. However, solid particles in the flooding fluid can cause problems, such as permanent clogging of the rock pores, particularly when these pores are small or if the particles in the utilized Pickering emulsion tend to flocculate or aggregate [5,24]. Toxicity, environmental impact, and sustainability are also major concerns when choosing particle-based materials for EOR applications [1,5].…”

Section: Introductionmentioning

confidence: 99%

“…However, solid particles in the flooding fluid can cause problems, such as permanent clogging of the rock pores, particularly when these pores are small or if the particles in the utilized Pickering emulsion tend to flocculate or aggregate [5,24]. Toxicity, environmental impact, and sustainability are also major concerns when choosing particle-based materials for EOR applications [1,5]. Thus, developing solid-free emulsifiers with pH responsiveness is more desirable for EOR applications.…”

Section: Introductionmentioning

confidence: 99%

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pH-Responsive Nanoemulsions Based on a Dynamic Covalent Surfactant

Ren

et al. 2021

Nanomaterials

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Developing solid-free nanoemulsions with pH responsiveness is desirable in enhanced oil recovery (EOR) applications. Here, we report the synthesis of an interfacial activity controllable surfactant (T−DBA) through dynamic imine bonding between taurine (T) and p-decyloxybenzaldehyde (DBA). Instead of macroemulsions, nanoemulsions can be prepared by using T−DBA as an emulsifier. The dynamic imine bond of T−DBA enables switching between the active and inactive states in response to pH. This switching of interfacial activity was used to gate the stability of nanoemulsions, thus enabling us to turn the nanoemulsions off and on. Using such dynamic imine bonds to govern nanoemulsion stability could enable intelligent control of many processes such as heavy oil recovery and interfacial reactions.

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Section: The Emulsification Ability Of the T−dba Surfactantmentioning

confidence: 99%