Dispersion Stability of Phytoglycogen in Water/Phytoglycogen/Various Nonionic Surfactant Systems: Effect of Hydrophile–Lipophile Balance (HLB) of Nonionic Surfactants

1997 ◽  
Vol 70 (12) ◽  
pp. 2943-2949
Author(s):  
Akihiro Nakano ◽  
Koichi Tateishi
Keyword(s):  
Nonionic Surfactant ◽  
Nonionic Surfactants ◽  
Dispersion Stability ◽  
Surfactant Systems

Precipitating polyelectrolyte–surfactant systems by admixing a nonionic surfactant – a case of cononsurfactancy

Soft Matter ◽  
2017 ◽  
Vol 13 (29) ◽  
pp. 4988-4996 ◽  
Author(s):  
Leonardo Chiappisi ◽  
Stephen David Leach ◽  
Michael Gradzielski
Keyword(s):  
Nonionic Surfactant ◽  
Anionic Surfactant ◽  
Nonionic Surfactants ◽  
Unexpected Formation ◽  
Structural Investigations ◽  
Surfactant Systems

Thermodynamic and structural investigations reveal the origin of the unexpected formation of insoluble complexes upon admixing nonionic surfactants to polyelectrolyte/anionic surfactant complexes.

Thermodynamic studies of mixed ionic/nonionic surfactant systems

2004 ◽  
Vol 276 (1) ◽  
pp. 197-207 ◽  
Author(s):  
B.M Razavizadeh ◽  
M Mousavi-Khoshdel ◽  
H Gharibi ◽  
R Behjatmanesh-Ardakani ◽  
S Javadian ◽  
...  
Keyword(s):  
Nonionic Surfactant ◽  
Thermodynamic Studies ◽  
Surfactant Systems

A Temperature Operating Window Concept for Application of Nonionic Surfactants for EOR in Unconventional Shale Reservoirs

2021 ◽  
Author(s):  
I Wayan Rakananda Saputra ◽  
David S. Schechter
Keyword(s):  
Crude Oil ◽  
Nonionic Surfactant ◽  
Cloud Point ◽  
Oil Recovery ◽  
Nonionic Surfactants ◽  
Spontaneous Imbibition ◽  
Reservoir Temperature ◽  
Rock System ◽  
Temperature Operating ◽  
Operating Window

Abstract Surfactant performance is a function of its hydrophobic tail, and hydrophilic head in combination with crude oil composition, brine salinity, rock composition, and reservoir temperature. Specifically, for nonionic surfactants, temperature is a dominant variable due to the nature of the ethylene oxide (EO) groups in the hydrophilic head known as the cloud point temperature. This study aims to highlight the existence of temperature operating window for nonionic surfactants to optimize oil recovery during EOR applications in unconventional reservoirs. Two nonylphenol (NP) ethoxylated nonionic surfactants with different EO head groups were investigated in this study. A medium and light grade crude oil were utilized for this study. Core plugs from a carbonate-rich outcrop and a quartz-rich outcrop were used for imbibition experiments. Interfacial tension and contact angle measurements were performed to investigate the effect of temperature on the surfactant interaction in an oil/brine and oil/brine/rock system respectively. Finally, a series of spontaneous imbibition experiments was performed on three temperatures selected based on the cloud point of each surfactant in order to construct a temperature operating window for each surfactant. Both nonionic surfactants were observed to improve oil recovery from the two oil-wet oil/rock system tested in this study. The improvement was observed on both final recovery and rate of spontaneous imbibition. However, it was observed that each nonionic surfactant has its optimum temperature operating window relative to the cloud point of that surfactant. For both nonionic surfactants tested in this study, this window begins from the cloud point of the surfactant up to 25°F above the cloud point. Below this operating window, the surfactant showed subpar performance in increasing oil recovery. This behavior is caused by the thermodynamic equilibrium of the surfactant at this temperature which drives the molecule to be more soluble in the aqueous-phase as opposed to partitioning at the interface. Above the operating window, surfactant performance was also inferior. Although for this condition, the behavior is caused by the preference of the surfactant molecule to be in the oleic-phase rather than the aqueous-phase. One important conclusion is the surfactant achieved its optimum performance when it positions itself on the oil/water interface, and this configuration is achieved when the temperature of the system is in the operating window mentioned above. Additionally, it was also observed that the 25°F operating window varies based on the characteristic of the crude oil. A surfactant study is generally performed on a single basin, with a single crude oil on a single reservoir temperature or even on a proxy model at room temperature. This study aims to highlight the importance of applying the correct reservoir temperature when investigating nonionic surfactant behavior. Furthermore, this study aims to introduce a temperature operating window concept for nonionic surfactants. This work demonstrates that there is not a "one size fits all" surfactant design.

Correction to “Directly vs Indirectly Enhanced 13C in Dynamic Nuclear Polarization Magic Angle Spinning NMR Experiments of Nonionic Surfactant Systems”

2017 ◽  
Vol 121 (42) ◽  
pp. 23847-23847
Author(s):  
Markus M. Hoffmann ◽  
Sarah Bothe ◽  
Torsten Gutmann ◽  
Frank-Frederik Hartmann ◽  
Michael Reggelin ◽  
...  
Keyword(s):  
Nonionic Surfactant ◽  
Dynamic Nuclear Polarization ◽  
Nuclear Polarization ◽  
Magic Angle Spinning ◽  
Magic Angle ◽  
Surfactant Systems ◽  
Angle Spinning

Wormlike micelles in Tween-80/CmEO3 mixed nonionic surfactant systems in aqueous media

2007 ◽  
Vol 312 (2) ◽  
pp. 489-497 ◽  
Author(s):  
Dharmesh Varade ◽  
Kousuke Ushiyama ◽  
Lok Kumar Shrestha ◽  
Kenji Aramaki
Keyword(s):  
Nonionic Surfactant ◽  
Aqueous Media ◽  
Tween 80 ◽  
Wormlike Micelles ◽  
Surfactant Systems
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