Study on the thixotropy and structural recovery characteristics of waxy crude oil emulsion

Guo, Liping; Han, Xue; Lei, Yun; Wang, Lei; Yu, Ping; Shi, Shuang

doi:10.1016/j.petsci.2021.07.003

Cited by 17 publications

(10 citation statements)

References 23 publications

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“…The recovery percentages of the storage modulus, listed in Table 3, range between 87 and 95% without a significant difference between the HG : OG ratios, suggesting that the bigel is a highly thixotropic material. 63 Statistical analysis shows that the recovery percentages of bigels are significantly higher than that of a pure oleogel, in contrast to previous reports of waxy crude oil emulsions 64 and oleogel emulsions 41 where the presence of dispersed water droplets resulted in reduced thixotropic recovery ability. The improved recovery in the bigels may be attributed to the interactions between the emulsifier coated hydrogel droplets and the oleogel matrix, described in the previous section.…”

Section: Resultscontrasting

confidence: 81%

The effect of preparation temperature and composition on bigel performance as fat replacers

Vershkov

2023

Food Funct.

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Section: Resultscontrasting

confidence: 81%

The effect of preparation temperature and composition on bigel performance as fat replacers

Vershkov

2023

Food Funct.

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“…The shear rate and stress then gradually increase, but not uniformly. However, while the shear rate does not increase uniformly due to the simultaneous decrease in viscosity, the shear stress increases abruptly due to structural cracking . As the shear stress decreases, the viscosity gradually increases and the hydrogel’s structure is recovered.…”

Section: Resultsmentioning

confidence: 99%

“…The rapid decrease in the shear rate observed the fast recovery of the Guo/GMP-PEI hydrogel. Additionally, the hydrogel exhibited on-time recovery, meaning that the upward and downward curves coincide and do not deviate from the shear stress axis, and the area of the hysteresis loop reflects the thixotropy of the system . Importantly, in hysteresis loops, the recorded area remained constant for all three loops, indicating that the gel structure remained undamaged and demonstrating the hydrogel’s fast recovery rate.…”

Section: Resultsmentioning

confidence: 99%

Advanced Binary Guanosine and Guanosine 5'-Monophosphate Cell-Laden Hydrogels for Soft Tissue Reconstruction by 3D Bioprinting

Godoy-Gallardo

Merino-Gómez

Mateos‐Timoneda

et al. 2023

ACS Appl. Mater. Interfaces

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Soft tissue defects or pathologies frequently necessitate the use of biomaterials that provide the volume required for subsequent vascularization and tissue formation as autrografts are not always a feasible alternative. Supramolecular hydrogels represent promising candidates because of their 3D structure, which resembles the native extracellular matrix, and their capacity to entrap and sustain living cells. Guanosine-based hydrogels have emerged as prime candidates in recent years since the nucleoside self-assembles into well-ordered structures like G-quadruplexes by coordinating K + ions and π−π stacking, ultimately forming an extensive nanofibrillar network. However, such compositions were frequently inappropriate for 3D printing due to material spreading and low shape stability over time. Thus, the present work aimed to develop a binary cell-laden hydrogel capable of ensuring cell survival while providing enough stability to ensure scaffold biointegration during soft tissue reconstruction. For that purpose, a binary hydrogel made of guanosine and guanosine 5'monophosphate was optimized, rat mesenchymal stem cells were entrapped, and the composition was bioprinted. To further increase stability, the printed structure was coated with hyperbranched polyethylenimine. Scanning electron microscopic studies demonstrated an extensive nanofibrillar network, indicating excellent G-quadruplex formation, and rheological analysis confirmed good printing and thixotropic qualities. Additionally, diffusion tests using fluorescein isothiocyanate labeled-dextran (70, 500, and 2000 kDa) showed that nutrients of various molecular weights may diffuse through the hydrogel scaffold. Finally, cells were evenly distributed throughout the printed scaffold, cell survival was 85% after 21 days, and lipid droplet formation was observed after 7 days under adipogenic conditions, indicating successful differentiation and proper cell functioning. To conclude, such hydrogels may enable the 3D bioprinting of customized scaffolds perfectly matching the respective soft tissue defect, thereby potentially improving the outcome of the tissue reconstruction intervention.

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“…1−4 In the petroleum sector, emulsion stability is a critical issue encountered during crude oil dewatering. 5,6 Over the last several decades, there has been a large body of work focusing on the stability of emulsions or foams, which reports on the direct interactions between dispersed droplets or bubbles. Some researchers have recently investigated the influence of nanoparticles and wax crystals on emulsion system stability.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Oil–water emulsions are widely used in a variety of industries, including petroleum, pharmacy, food, cosmetics, etc. − In the petroleum sector, emulsion stability is a critical issue encountered during crude oil dewatering. , Over the last several decades, there has been a large body of work focusing on the stability of emulsions or foams, which reports on the direct interactions between dispersed droplets or bubbles. Some researchers have recently investigated the influence of nanoparticles and wax crystals on emulsion system stability. − Nonetheless, water-in-oil (W/O) emulsions have received less attention than oil-in-water (O/W) emulsions. A remarkable distinction between the two types of emulsions is the negligible electrical double layer (EDL) force in the former, due to the lack of free ions in the continuous oil phase .…”

Section: Introductionmentioning

confidence: 99%

Effect of Oil-Soluble/Water-Soluble Surfactants on the Stability of Water-in-Oil Systems, an Atomic Force Microscopy Study

Xiao

Gong

et al. 2023

Langmuir

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The stabilization mechanism of water-in-oil (W/O) emulsions has been studied by measuring the interactions between two water droplets in n-tetradecane using atomic force microscopy. The effects of water-soluble surfactants (SDS/CTAB/Tween 80), an oil-soluble surfactant (Span 20), and the coexistence of the water and oil-soluble surfactants on the stability of water droplets in oil were investigated separately. It is found that the addition of oil-soluble surfactants (Span 20) prevents the coalescence of water droplets in oil. To discuss the role of an oil-soluble surfactant, we analyzed the force curve by applying the theoretical model. The results demonstrate that the oil-soluble surfactant (Span 20) stabilizes dispersed droplets by adsorbing onto the interface and forming a relatively tighter layer with the increase in surfactant concentration, which hinders film rupture. This behavior of the surfactant could also be properly characterized by steric hindrance. A further step was taken by introducing another water-soluble surfactant. It is found that the addition of either SDS or CTAB into the water phase is futile in inducing droplet coalescence in the presence of Span 20. In contrast, Tween 80 was found to be effective in destabilizing water droplets, which could be due to the competitive adsorption between Tween 80 and Span 20 at the interface. By characterizing the interfacial adsorption of Tween 80 and Span 20 with a theoretical adsorption isotherm model, the result indicates that interface replacement would result in a loose adsorption layer that is insufficient to hinder droplet coalescence. Our study provides an intriguing understanding of the role of surfactants in the stabilization and destabilization of water-in-oil emulsions.

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Study on the thixotropy and structural recovery characteristics of waxy crude oil emulsion

Cited by 17 publications

References 23 publications

The effect of preparation temperature and composition on bigel performance as fat replacers

The effect of preparation temperature and composition on bigel performance as fat replacers

Advanced Binary Guanosine and Guanosine 5'-Monophosphate Cell-Laden Hydrogels for Soft Tissue Reconstruction by 3D Bioprinting

Effect of Oil-Soluble/Water-Soluble Surfactants on the Stability of Water-in-Oil Systems, an Atomic Force Microscopy Study

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