Reversible temperature regulation of CO2-responsive ionic liquid microemulsion

Zhang, Ying; Liu, Dongfang; Wang, Baogang; Lu, Hongsheng; Huang, Zhiyu

doi:10.1016/j.colsurfa.2020.125000

Cited by 14 publications

(16 citation statements)

References 36 publications

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“…Additionally, temperature-induced expansion in the single-phase region also occurred in the octanol–MDEA–water and octanol–TEA–water SFMEs (Figure S13). This is similar to octanol–ethanol–water, n -butanol–DMSO–water, and ionic liquids–ethanol– n -hexane SFMEs …”

Section: Resultssupporting

confidence: 66%

“…Unlike traditional SBMEs, the stability of SFMEs depends on the balance between hydration force and entropy . Therefore, the temperature-responsiveness essentially originates from the change of hydrogen bond interaction between molecules. ,, Changes in the intensity of a hydrogen bond may cause amphiphilic molecules transfer between the interface phase and polar/nonpolar phase. The data of potentiometric titration revealed that the f w/total increased from 60.59 wt % at 25 °C to 63.04 wt % at 12 °C (Figure S12B), suggesting that lower temperature favors the migration of amphisolvent to water phase.…”

Section: Resultsmentioning

confidence: 99%

“…This is similar to octanol−ethanol−water, 32 nbutanol−DMSO−water, 31 and ionic liquids−ethanol−n-hexane SFMEs. 42 Formulation e, consisting of 25.58 wt % octanol, 33.38 wt % water, and 41.04 wt % DMEA (marked by a blue star in Figure 6A), was chosen as a model to further evaluate the influence of temperature on the size of nanoaggregates. As exhibited in Figure 6B, the average R h of droplets at 25 °C was 19.00 ± 0.31 nm (PDI =0.248).…”

Section: Scheme 1 Molecular Structures Of Hydroxyethylamine Compoundsmentioning

confidence: 99%

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CO₂ and Temperature Control over Nanoaggregates in Surfactant-Free Microemulsion

Zhou

et al. 2021

Langmuir

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Smart microemulsions (MEs) recently have attracted significant interests. However, MEs, especially surfactantfree MEs (SFMEs) that respond to more than one stimulus, are rarely reported to date. Here, we reported the first example of dualresponsive SFME in which a CO 2 -sensitive hydroxyethylamine was used as an amphisolvent. This SFME was investigated utilizing ternary phase diagram, dynamic light scattering, and UV−visible spectrum techniques. It was found that three hydroxyethylamines could stabilize the octanol−water mixture to form transparent and isotropic SFMEs including nanoaggregates-rich pre-ouzo zone, regardless of the number of the hydroxyl group. Among them, 2-(dimethyl amino) ethanol (DMEA)-based SFME possesses the largest single-phase region and most sensitive to CO 2 and the changes in temperature. With bubbling of CO 2 /N 2 or decreasing/increasing temperature, both the single-phase region and pre-ouzo zone reversibly shrink and expand, as well as with breathing. However, CO 2 /N 2 -induced change is more significant than that induced by temperature. The former is mainly ascribed to the reversible protonation and deprotonation of DMEA, while the latter is generally interpreted as the effects of temperature on hydrogen bond interaction. Note that CO 2 leads to a thorough demusification from Winsor IV ME to oil-rich and water-rich two phases without nanoaggregates, while cooling only causes to a particular phase separation, producing two new MEs phases, not typical Winsor I or II MEs. Such a unique dual-responsive SFME can not only be applied in the remediation of contaminated soil, drug delivery, and nanoparticles preparation but also opens a new door to switchable emulsion.

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Section: Resultssupporting

confidence: 66%

Section: Resultsmentioning

confidence: 99%

Section: Scheme 1 Molecular Structures Of Hydroxyethylamine Compoundsmentioning

confidence: 99%

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CO₂ and Temperature Control over Nanoaggregates in Surfactant-Free Microemulsion

Zhou

et al. 2021

Langmuir

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“…In the process of microemulsion preparation, the conductivity of the microemulsion change with the water content. The conductivity method is one of the methods to determine the microstructure of microemulsion (Gao et al, 2006; Xu et al, 2013; Zhang et al, 2020). The electrical conductivity of the microemulsion was shown in Figure 2.…”

Section: Resultsmentioning

confidence: 99%

“…The microemulsion is a thermodynamically stable homogeneous system obtained by emulsifying the oil and water evenly through surfactant and cosurfactant. The microemulsion is usually transparent or translucent (Liu et al, 2017(Liu et al, , 2019Zhang et al, 2020), and the droplet size is between 10 and 100 nm (Rakshit et al, 2019). Microemulsions can be divided into oil-in-water (O/W) type microemulsions, where the continuous phase is water and the dispersed phase is oil, and water-in-oil (W/O) microemulsions, where the continuous phase is oil and the dispersed phase is water.…”

Section: Introductionmentioning

confidence: 99%

Wettability reversal of reservoir rock surface through surfactant stabilized microemulsion

Huang

Liu

Zhang

et al. 2022

J Surfact & Detergents

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In the process of the tertiary recovery of oil and gas resources, it is necessary to use external fluids to displace the crude oil in the reservoir. Whether the crude oil on the surface of the rock can be effectively displaced and the wettability of the rock can be changed to avoid re-adsorption by the crude oil is directly related to the level of oil recovery. Therefore, it is critical to study the cleaning and wettability reversal of reservoir rock surface. Because microemulsions have outstanding performance in changing the wettability of rocks and solubilizing crude oil, this paper uses cetyl trimethyl ammonium bromide (CTAB) as a surfactant and n-butanol as a co-surfactant to prepare microemulsions. The performance of microemulsions with different microstructures on the cleaning and wettability changes of crude oil on the rock surface were studied. The results show that the water-in-oil (W/O) microemulsion has good cleaning efficiency, and the oil removal rate on the sandstone core surface can reach 79.65%. In terms of changing the wettability of the rock surface, W/O, bicontinuous phase (B.C.) and oil-in-water (O/W) microemulsions can change the core surface from lipophilic to hydrophilic. And the effects of the B.C. and O/W microemulsions are more obvious. The microemulsion system that was prepared based on cationic surfactants has a good application prospect in changing the wettability of the reservoir and cleaning the adsorbed crude oil.

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A perspective of microemulsions in critical metal separation and recovery: Implications for potential application of CO2-responsive microemulsions

Wang

Zhu

et al. 2023

Chemosphere

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Reversible temperature regulation of CO2-responsive ionic liquid microemulsion

Cited by 14 publications

References 36 publications

CO₂ and Temperature Control over Nanoaggregates in Surfactant-Free Microemulsion

CO₂ and Temperature Control over Nanoaggregates in Surfactant-Free Microemulsion

Wettability reversal of reservoir rock surface through surfactant stabilized microemulsion

A perspective of microemulsions in critical metal separation and recovery: Implications for potential application of CO2-responsive microemulsions

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Reversible temperature regulation of CO2-responsive ionic liquid microemulsion

Cited by 14 publications

References 36 publications

CO2 and Temperature Control over Nanoaggregates in Surfactant-Free Microemulsion

CO2 and Temperature Control over Nanoaggregates in Surfactant-Free Microemulsion

Wettability reversal of reservoir rock surface through surfactant stabilized microemulsion

A perspective of microemulsions in critical metal separation and recovery: Implications for potential application of CO2-responsive microemulsions

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Product

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CO₂ and Temperature Control over Nanoaggregates in Surfactant-Free Microemulsion

CO₂ and Temperature Control over Nanoaggregates in Surfactant-Free Microemulsion