scholarly journals Formulation and characterization of oil-in-water nanoemulsions stabilized by crude saponins isolated from onion skin waste

RSC Advances ◽  
2020 ◽  
Vol 10 (65) ◽  
pp. 39700-39707
Author(s):  
Saad M. Dahlawi ◽  
Wahab Nazir ◽  
Rashid Iqbal ◽  
Waqas Asghar ◽  
Nauman Khalid
Keyword(s):  
Interfacial Tension ◽  
Onion Skin ◽  
Oil In Water ◽  
Oil Water ◽  
Natural Emulsifier

Crude saponins isolated from onion skin waste were studied to minimize the interfacial tension at oil–water interfaces, and to evaluate important factors on the formulation and characterization of nanoemulsions stabilized by these saponins as a new natural emulsifier.

scholarly journals Stabilization of Oil-Water Emulsions by Hydrophobic Bacteria

2004 ◽  
Vol 70 (10) ◽  
pp. 6333-6336 ◽  
Author(s):  
Loredana S. Dorobantu ◽  
Anthony K. C. Yeung ◽  
Julia M. Foght ◽  
Murray R. Gray
Keyword(s):  
Interfacial Tension ◽  
Bacterial Growth ◽  
Solid Particles ◽  
Bacterial Cells ◽  
Droplet Coalescence ◽  
Oil In Water ◽  
Emulsion Stabilization ◽  
Oil Water ◽  
Oil Emulsions

ABSTRACT Formation of oil-water emulsions during bacterial growth on hydrocarbons is often attributed to biosurfactants. Here we report the ability of certain intact bacterial cells to stabilize oil-in-water and water-in-oil emulsions without changing the interfacial tension, by inhibition of droplet coalescence as observed in emulsion stabilization by solid particles like silica.

scholarly journals Mechanical Characterization of Ultralow Interfacial Tension Oil-in-Water Droplets by Thermal Capillary Wave Analysis in a Microfluidic Device

Langmuir ◽  
2016 ◽  
Vol 32 (15) ◽  
pp. 3580-3586 ◽  
Author(s):  
Guido Bolognesi ◽  
Yuki Saito ◽  
Arwen I. I. Tyler ◽  
Andrew D. Ward ◽  
Colin D. Bain ◽  
...  
Keyword(s):  
Interfacial Tension ◽  
Microfluidic Device ◽  
Mechanical Characterization ◽  
Capillary Wave ◽  
Wave Analysis ◽  
Water Droplets ◽  
Oil In Water ◽  
Ultralow Interfacial Tension

Observations on the Coalescence Behavior of Oil Droplets and Emulsion Stability in Enhanced Oil Recovery

1978 ◽  
Vol 18 (06) ◽  
pp. 409-417 ◽  
Author(s):  
D.T. Wasan ◽  
S.M. Shah ◽  
N. Aderangi ◽  
M.S. Chan ◽  
J.J. McNamara
Keyword(s):  
Interfacial Tension ◽  
Crude Oil ◽  
Oil Recovery ◽  
Emulsion Stability ◽  
Surfactant Solution ◽  
Chemical Additives ◽  
Oil In Water ◽  
Tertiary Oil Recovery ◽  
Oil Water ◽  
Low Tension

Original manuscript received in Society of Petroleum Engineers office Sept. 20, 1977. Paper accepted for publication June 2, 1978. Revised manuscript received Aug. 2, 1978. Paper (SPE 6846) was presented at SPE-AIME 52nd Annual Fall Technical Conference and Exhibition, held in Denver, Oct. 9-12, 1977. Abstract Results of experiments on the coalescence of crude oil drops at an oil-water interface and interdroplet coalescence in crude oil-water emulsions containing petroleum sulfonates and cosurfactant as surfactant systems with other chemical additives were analyzed in terms of interracial viscosity, interfacial tension, interfacial charge, and thickness of the films surrounding the microdroplets. A qualitative correlation was found between coalescence rates and interfacial viscosities; however, there appears to be no direct correlation with interfacial tension. New insight has been gained into the influence of emulsion stability in tertiary oil recovery by surfactant/polymer flooding in laboratory core tests. We concluded that those systems that result in relatively stable emulsions yield poor coalescence rates and, hence, poor oil recovery, Introduction The ability of the surfactant/polymer system to initiate and to propagate an oil bank is the single most important feature of a successful tertiary oil-recovery process. The mechanisms of oil-bank formation and development are yet unknown. It has been suggested that without the initiation of the oil bank, the process behaves more like the unstable injection of a surfactant solution alone, where the oil is produced by entrainment or emulsification in the flowing surfactant stream. In a laboratory study of the initial displacement of residual hydrocarbons by aqueous surfactant solutions, Childress and Schechter and Wade observed that those systems that spontaneously emulsified and coalesced rapidly yielded better oil recovery than those systems that spontaneously formed stable emulsions. Recently, Strange and Talash, Whitley and Ware, and Widmeyer et al. reported results of Salem (IL) low-tension, water-flood tests that used Witco TRS 10-80 TM petroleum sulfonate surfactant solution. They found stable oil-in-water emulsions at the observer well in addition to emulsion problems at the production well and reported that problems at the production well and reported that actual oil recovery was about one-quarter the target value. These studies clearly suggested that poor efficiency of oil recovery results from emulsion stability problems in the low-tension surfactant or micellar processes. Vinatieri presented results of experiments on the stability of crude-oil-in-water emulsions that coo be produced during a surfactant or micellar flood. More recently, we have assessed the rigidity of interfacial films and its relationship to coalescence rate through measurements of interfacial viscosities of crude oils contacted against aqueous solutions containing various concentrations of surfactants and other pertinent chemical additives. Our data clearly indicate that in the absence of a commercial surfactant, interfacial viscosity builds up rapidly, coalescence is inhibited, and the resulting emulsion is quite stable. These phenomena also have been observed by Gladden and Neustadter. Several studies were conducted on the structure of film-forming material at the crude oil/water interface, its effect on emulsion stability, and the role of such films in oil recovery by water or caustic solution displacements. Rigid films were found to reduce the amount of oil recovered. Our studies also have shown that the addition of a commercial surfactant lowered both the interfacial viscosity (ISV) and interfacial tension (IFT) of the crude oil-aqueous solution system. However, the concentration at which both the IFT and ISV are minimized cannot be identified by measuring IFT alone. We have conducted a cinephotomicrographic examination of spontaneous emulsification and a microvisual study of the displacement of residual crude oil by aqueous surfactant solutions in micromodel porous media. SPEJ P. 409

scholarly journals Emulsion Formation and Stabilizing Properties of Olive Oil Cake Crude Extracts

Processes ◽  
2021 ◽  
Vol 9 (4) ◽  
pp. 633
Author(s):  
Firdaous Fainassi ◽  
Noamane Taarji ◽  
Fatiha Benkhalti ◽  
Abdellatif Hafidi ◽  
Marcos A. Neves ◽  
...  
Keyword(s):  
Olive Oil ◽  
Ethanol Extract ◽  
Active Components ◽  
Oil In Water ◽  
Surface Active ◽  
Ph Conditions ◽  
Oil Water ◽  
Surface Active Compounds ◽  
Ionizable Groups ◽  
Emulsifying Ability

The surface-active and emulsifying properties of crude aqueous ethanolic extracts from untreated olive oil cake (OOC) were investigated. OOC extracts contained important concentrations of surface-active components including proteins, saponins and polyphenols (1.2–2.8%, 7.8–9.5% and 0.7–4.5% (w/w), respectively) and reduced the interfacial tension by up to 46% (14.0 ± 0.2 mN m−1) at the oil–water interface. The emulsifying ability of OOC extracts was not correlated, however, with their interfacial activity or surface-active composition. Eighty percent aqueous ethanol extract produced the most stable oil-in-water (O/W) emulsions by high-pressure homogenization. The emulsions had average volume mean droplet diameters of approximately 0.4 µm and negative ζ-potentials of about -45 mV, and were stable for up to 1 month of storage at 5, 25 and 50 °C. They were sensitive, however, to acidic pH conditions (<5) and NaCl addition (≥25 mM), indicating that the main stabilization mechanism is electrostatic due to the presence of surface-active compounds with ionizable groups, such as saponins.

scholarly journals Design and characterization of oil-in-water nanoemulsion for enhanced oil recovery stabilized by amphiphilic copolymer, nonionic surfactant, and LAPONITE® RD

RSC Advances ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 1952-1959
Author(s):  
Yi Zhao ◽  
Fangfang Peng ◽  
Yangchuan Ke
Keyword(s):  
Particle Size ◽  
Nonionic Surfactant ◽  
Enhanced Oil Recovery ◽  
Oil Recovery ◽  
Small Particle ◽  
Amphiphilic Copolymer ◽  
Good Stability ◽  
Small Particle Size ◽  
Oil In Water

Emulsion with small particle size and good stability stabilized by emulsifiers was successfully prepared for EOR application.

scholarly journals Mechanism of active silica nanofluids based on interface-regulated effect during spontaneous imbibition

2021 ◽  
Author(s):  
Xu-Guang Song ◽  
Ming-Wei Zhao ◽  
Cai-Li Dai ◽  
Xin-Ke Wang ◽  
Wen-Jiao Lv
Keyword(s):  
Contact Angle ◽  
Interfacial Tension ◽  
Oil Recovery ◽  
Dynamic Contact Angle ◽  
Liquid Interface ◽  
Spontaneous Imbibition ◽  
Wettability Alteration ◽  
Low Permeability ◽  
Oil Water ◽  
Solid Liquid

AbstractThe ultra-low permeability reservoir is regarded as an important energy source for oil and gas resource development and is attracting more and more attention. In this work, the active silica nanofluids were prepared by modified active silica nanoparticles and surfactant BSSB-12. The dispersion stability tests showed that the hydraulic radius of nanofluids was 58.59 nm and the zeta potential was − 48.39 mV. The active nanofluids can simultaneously regulate liquid–liquid interface and solid–liquid interface. The nanofluids can reduce the oil/water interfacial tension (IFT) from 23.5 to 6.7 mN/m, and the oil/water/solid contact angle was altered from 42° to 145°. The spontaneous imbibition tests showed that the oil recovery of 0.1 wt% active nanofluids was 20.5% and 8.5% higher than that of 3 wt% NaCl solution and 0.1 wt% BSSB-12 solution. Finally, the effects of nanofluids on dynamic contact angle, dynamic interfacial tension and moduli were studied from the adsorption behavior of nanofluids at solid–liquid and liquid–liquid interface. The oil detaching and transporting are completed by synergistic effect of wettability alteration and interfacial tension reduction. The findings of this study can help in better understanding of active nanofluids for EOR in ultra-low permeability reservoirs.

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