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

The Effect of Surfactant on the Morphology of SnO2 Nanoarrays

2011 ◽  
Vol 338 ◽  
pp. 495-498
Author(s):  
Ya Li Wang ◽  
Yu Jing ◽  
Qiang Zhen
Keyword(s):  
Nonionic Surfactant ◽  
Hydrothermal Method ◽  
Cationic Surfactant ◽  
Tin Oxide ◽  
Anionic Surfactant ◽  
Indium Tin Oxide ◽  
Polyvinyl Pyrrolidone ◽  
Disordered Structure

The morphology of SnO2nanoarrays prepared on indium tin oxide (ITO) substrates by hydrothermal method can be controlled through using different surfactants. The surfactants play an important role in influencing the morphology and size of SnO2nanoarrays. The rod-like nano-arrays prepared by using cationic surfactant, disordered structure randomly assembled by nanoparticle obtained by using anionic surfactant, the flower-like nanoarrays synthesized by using nonionic surfactant. Furthermore, the effect of the amount of nonionic surfactant-polyvinyl pyrrolidone(PVP) on the morphology and size of flower-like SnO2nanoarrays has systematically been investigated.

scholarly journals Nonionic Surfactant to Enhance the Performances of Alkaline–Surfactant–Polymer Flooding with a Low Salinity Constraint

2020 ◽  
Vol 10 (11) ◽  
pp. 3752 ◽  
Author(s):  
Shabrina Sri Riswati ◽  
Wisup Bae ◽  
Changhyup Park ◽  
Asep K. Permadi ◽  
Adi Novriansyah
Keyword(s):  
Nonionic Surfactant ◽  
Oil Recovery ◽  
Anionic Surfactant ◽  
Pore Volume ◽  
Salinity Gradient ◽  
Reference Case ◽  
Low Salinity ◽  
Asp Flooding ◽  
Optimum Salinity ◽  
Alkaline Surfactant Polymer

This paper presents a nonionic surfactant in the anionic surfactant pair (ternary mixture) that influences the hydrophobicity of the alkaline–surfactant–polymer (ASP) slug within low-salinity formation water, an environment that constrains optimal designs of the salinity gradient and phase types. The hydrophobicity effectively reduced the optimum salinity, but achieving as much by mixing various surfactants has been challenging. We conducted a phase behavior test and a coreflooding test, and the results prove the effectiveness of the nonionic surfactant in enlarging the chemical applicability by making ASP flooding more hydrophobic. The proposed ASP mixture consisted of 0.2 wt% sodium carbonate, 0.25 wt% anionic surfactant pair, and 0.2 wt% nonionic surfactant, and 0.15 wt% hydrolyzed polyacrylamide. The nonionic surfactant decreased the optimum salinity to 1.1 wt% NaCl compared to the 1.7 wt% NaCl of the reference case with heavy alcohol present instead of the nonionic surfactant. The coreflooding test confirmed the field applicability of the nonionic surfactant by recovering more oil, with the proposed scheme producing up to 74% of residual oil after extensive waterflooding compared to 51% of cumulative oil recovery with the reference case. The nonionic surfactant led to a Winsor type III microemulsion with a 0.85 pore volume while the reference case had a 0.50 pore volume. The nonionic surfactant made ASP flooding more hydrophobic, maintained a separate phase of the surfactant between the oil and aqueous phases to achieve ultra-low interfacial tension, and recovered the oil effectively.

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