Mechanisms on the stability and instability of water-in-oil emulsion stabilized by interfacially active asphaltenes: Role of hydrogen bonding reconstructing

Fuel ◽  
2021 ◽  
Vol 297 ◽  
pp. 120763
Author(s):  
Jun Ma ◽  
Yongli Yang ◽  
Xingang Li ◽  
Hong Sui ◽  
Lin He
Keyword(s):  
Hydrogen Bonding ◽  
Oil Emulsion ◽  
Stability And Instability ◽  
The Stability ◽  
Water In Oil Emulsion

Effect of the Surfactant Concentration on Sinking Electric Discharge Machining Performance with Water-in-Oil Emulsion as Dielectric

2011 ◽  
Vol 189-193 ◽  
pp. 3153-3157
Author(s):  
Yan Zhen Zhang ◽  
Yong Hong Liu ◽  
Ren Jie Ji ◽  
Bao Ping Cai
Keyword(s):  
Physical Properties ◽  
Electric Discharge ◽  
Surfactant Concentration ◽  
Emulsion Stability ◽  
Experimental Results ◽  
Machining Performance ◽  
Electric Discharge Machining ◽  
Oil Emulsion ◽  
The Stability ◽  
Water In Oil Emulsion

In this paper, the EDM performance of water-in-oil (W/O) emulsions dielectric with different surfactant concentration is investigated by correlated to its physical properties, such as viscosity and droplets size, which is predominantly determined by the surfactant concentration. Experimental results show that the stability of the W/O emulsions increases with increasing surfactant concentration, whereas the EDM performance deteriorates with increasing surfactant concentration. So, taking a comprehensively consideration of the emulsion stability and EDM performance, the concentration of surfactant must be appropriately selected.

Effects of surfactant molecular structure on the stability of water in oil emulsion

2021 ◽  
Vol 196 ◽  
pp. 107695
Author(s):  
Guangsheng Cao ◽  
Tong Du ◽  
Yujie Bai ◽  
Tingyuan Yang ◽  
Jize Zuo
Keyword(s):  
Molecular Structure ◽  
Oil Emulsion ◽  
The Stability ◽  
Stability Of Water ◽  
Water In Oil Emulsion

Dispersed Phase and Emulsification Conditions on the Stability of Water-in-Oil Emulsion

2017 ◽  
Vol 7 (1) ◽  
pp. 29-37
Author(s):  
Hulya Cakmak ◽  
Gozde Ela Gurpuz ◽  
Neslihan Bozdogan ◽  
Seher Kumcuoglu ◽  
Sebnem Tavman
Keyword(s):  
Dispersed Phase ◽  
Oil Emulsion ◽  
The Stability ◽  
Stability Of Water ◽  
Water In Oil Emulsion

Pressure Drop Reduction of Stable Water-in-Oil Emulsion Flow: Role of Water Fraction and Pipe Diameter

2013 ◽  
Author(s):  
M. Al-Yaari ◽  
A. Al-Sarkhi ◽  
I. Hussein ◽  
M. Abbad ◽  
F. Chang ◽  
...  
Keyword(s):  
Pressure Drop ◽  
Pipe Diameter ◽  
Oil Emulsion ◽  
Water Fraction ◽  
Emulsion Flow ◽  
Water In Oil Emulsion

scholarly journals Malaysian Crude Oil Emulsions : Stability Study

REAKTOR ◽  
2017 ◽  
Vol 6 (1) ◽  
pp. 29
Author(s):  
B. Pramudono ◽  
H. B. Mat
Keyword(s):  
Crude Oil ◽  
Emulsion Stability ◽  
Stability Study ◽  
Active Components ◽  
Oil Emulsion ◽  
Result Show ◽  
Oil Emulsions ◽  
The Stability ◽  
Stability Of Water ◽  
Water In Oil Emulsion

The stability of water-in-oil emulsion of some Malaysian crude oils was studied with particular emphasis on effect of interfacial active components existed in the crude oil, i.e. asphaltene, resin and wax. The emulsion stability was studied by measuring the volume of water or oil phase separated in variation with time, water hold up, and the heights of the sedimenting/coalescing interfaces during the separation at various temperatures. The study investigated the influence of asphaltene, resin and wax on emultion stability if it`s present in the crude oil alone, together or combination one of the others. The result show that the interfacial active component that stabilize emulsion is asphaltene. The resin and wax  do not form stale emulsion either aloneor together. There is a correlation between emulsion stability and physicochemical properties of crude oil which showed that higher asphaltene content in the crude oil would form more stable emultion. Increased temperature was found to cause instability of emultion. Keywords : emultion stability, crude oil, asphaltene, resin and wax

scholarly journals The Influence of WPC 80 Additive on the Stability of Water-In-Oil Emulsions

2015 ◽  
Vol 15 (4) ◽  
pp. 997-1008
Author(s):  
Małgorzata Tabaszewska ◽  
Tadeusz Grega ◽  
Dorota Najgebauer-Lejko ◽  
Grażyna Jaworska
Keyword(s):  
Storage Stability ◽  
Whey Proteins ◽  
Thiobarbituric Acid ◽  
Whey Protein Concentrate ◽  
Oil Emulsion ◽  
Oil Emulsions ◽  
The Stability ◽  
Cosmetic Emulsions ◽  
Stability Of Water ◽  
Water In Oil Emulsion

Abstract The effect of 0, 1.5, 5, 10 and 15 (g 100 g-1 of emulsion) WPC 80 additive (80% whey protein concentrate) on the pH, physical, oxidative and microbiological stability of the water-in-oil emulsion was studied during 16-week storage at ~20°C at 4-week intervals. All determined features were significantly affected by the supplementation. The most beneficial as regards storage stability was the emulsion with 5% of WPC 80. This treatment was the most resistant to oxidative changes showing low increase of the concentration of conjugated diene hydroperoxides (from 0.92 to 1.04 mg g-1) and of the thiobarbituric acid reactive substances (from 0.83 to 1.37 mg malondialdehyde g-1) as well as only slight increment (by 0.47 log CFU g-1) of the microorganisms number during storage. Thus, the results of the present study revealed that whey proteins can be applied in the proper amount to produce cosmetic emulsions composed of natural ingredients and with reasonable storage stability.

Determinism and Stability in Physics

2018 ◽  
pp. 61-81
Author(s):  
Yemima Ben-Menahem
Keyword(s):  
Quantum Mechanics ◽  
Statistical Mechanics ◽  
Chaos Theory ◽  
Physical Sciences ◽  
Stability And Instability ◽  
Conceptual Relations ◽  
The Stability

This chapter examines the role of stability and determinism in physical theories such as statistical mechanics. In the physical sciences, the notions of stability and instability, no longer camouflaged in the language of necessity and contingency, are often used in a variety of contexts, from chaos theory to quantum mechanics. Physicists consider questions about the stability of states, orbits, and structures to be as fundamental as questions about determinism. Before expounding on the conceptual relations between stability and determinism in physics, the chapter discusses three interconnected problems that statistical mechanics has had to tackle: the meaning of probability in statistical mechanics, the link between probability and a system's dynamics, and the origin of directionality. It shows that the notions of determinism and stability are often conflated, giving rise to teleological thinking.

scholarly journals Stability of water-in-oil emulsion in liquid membrane prospect

2017 ◽  
Vol 12 (3) ◽  
Author(s):  
Norela Jusoh ◽  
Norasikin Othman
Keyword(s):  
Surfactant Concentration ◽  
Liquid Membrane ◽  
Extraction Process ◽  
Single Step ◽  
Green Solvent ◽  
Emulsion Liquid Membrane ◽  
Oil Emulsion ◽  
The Stability ◽  
Stability Of Water ◽  
Water In Oil Emulsion

Emulsion liquid membrane (ELM) process have shown a great potential in wide application of industrial separations such as in removal of many chemicals, organic compounds, metal ions, pollutants and biomolecules. ELM promotes many advantages including simple operation, non-equilibrium mass transfer, high selectivity, low energy requirements, and simultaneous extraction and stripping process in a single step process. New development in ELM system incorporated with a green solvent (palm oil) was attempted instead of using commercial organic solvent. The important aspects must be considered for a successful ELM process is the stability of the liquid membrane. In the current work the effect of various parameter which are organic to internal ratio, emulsifying speed, surfactant concentration, and emulsifying time on green ELM stability was investigated. The results show that the most stable emulsion was observed at 3:1 organic to internal ratio, 7000 rpm speed, 3 % (w/v) surfactant concentration, and 5 minute emulsifying time. The emulsion obtained was stable up to 1/2 hour and sufficient and sufficient for extraction process. Therefore, green solvent has high potential to be applied in emulsion liquid membrane process. 

scholarly journals Surfactant (UMP) for emulsification and stabilization of water-in-crude oil emulsions (W/O)

2020 ◽  
Vol 2 (2) ◽  
pp. 18-21
Author(s):  
N. H. Abdurahman ◽  
H. A. Magdib
Keyword(s):  
Crude Oil ◽  
Oil Refinery ◽  
Oil Emulsion ◽  
Optimum Formulation ◽  
Emulsion Stabilization ◽  
Oil Water ◽  
Oil Emulsions ◽  
The Stability ◽  
Water In Oil Emulsion ◽  
Petroleum Oil

The purpose of this research is to look into the formulation and evaluation of concentrated water-in-oil (W/O) emulsions stabilized by UMP NS-19-02 surfactant and their application for crude oil emulsion stabilization using gummy Malaysian crude oil. A two-petroleum oil from Malaysia oil refinery, i.e., Tapis petroleum oil and Tapis- Mesilla blend, were utilized to make water-in-oil emulsions. The various factors influencing emulsion characteristics and stability were evaluated. It was discovered that the stability of the water-in-oil emulsion improved by UMP NS-19-02 improved as the surfactant content rises, resulting in the decline of the crude oil-water interfacial tension (IFT). Nevertheless, the most optimum formulation of W/O emulsion was a 50:50 W/O ratio with 1.0% surfactant. Additionally, raising the oil content, salt concentration, duration and mixing speed, and pH of the emulsion resulted in higher emulsion stability. It also raised the temperature of the initial mixing, which significantly decreased the formulated emulsions' viscosity. The results showed that stable emulsions could be formed using the UMP NS-19-02 surfactant.

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