Dilatational rheology of a gel point network formed by nonionic soluble surfactants at the oil–water interface

Anton, Nicolas; Vandamme, Thierry F.; Bouriat, Patrick

doi:10.1039/c2sm27161c

Cited by 16 publications

(13 citation statements)

References 27 publications

(44 reference statements)

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“…A decrease in the dilatational modulus is likely due to a competing effect in which salt increases the rate of surfactant adsorption leading to a decrease in the dilatational modulus at low oscillation frequencies. 56,63,65,66 This is also in agreement with our results that show an increase in the rate of surfactant adsorption with salt (see Figure 5). When the surfactant adsorption rate is faster than the oscillation frequency, interfacial tension gradients (Δγ) are dissipated quickly by the adsorbed surfactant, thus decreasing the dilatational modulus.…”

Section: Resultssupporting

confidence: 92%

“…It has also been shown that larger relaxation exponents correspond to more frequent interactions between surfactant molecules at the interface. 63 More surfactant adsorption should lead to an increase in the dilatational modulus. 63,65 This interpretation partially agrees with our results because systems with added salt (larger relaxation exponent) contained more adsorbed surfactant at the interface than did salt-free systems (lower relaxation exponent) as displayed by the IFT data in Figure 4.…”

Section: Resultsmentioning

confidence: 99%

“…63 More surfactant adsorption should lead to an increase in the dilatational modulus. 63,65 This interpretation partially agrees with our results because systems with added salt (larger relaxation exponent) contained more adsorbed surfactant at the interface than did salt-free systems (lower relaxation exponent) as displayed by the IFT data in Figure 4. Although surfactant−surfactant interactions at the interface were more frequent in the presence of salt, Figure 6 shows that salt decreased the moduli.…”

Section: Resultsmentioning

confidence: 99%

“…Equations and were originally used to describe a gel near its gelation point , and have since been used to characterize the low-frequency interfacial rheology of asphaltene , and a soluble non-ionic surfactant at an oil–water interface. Systems that follow eqs and exhibit gelation point behavior, and therefore, the system studied here appears to have rheological characteristics of a critical gel.…”

Section: Results and Discussionmentioning

confidence: 99%

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Impact of Saltwater Environments on the Coalescence of Oil-in-Water Emulsions Stabilized by an Anionic Surfactant

et al. 2021

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The impact of salts on the stability of oil-in-water emulsions to coalescence was studied to aid in minimizing the impact of emulsified oils on natural water systems. Oil-in-water emulsions were fabricated from mineral oil, deionized water, and sodium lauryl ether sulfate. As salt (NaCl) concentrations increased from 0 to 1.25 M, an increase in emulsion stability to coalescence was observed over an aging period of 56 days. ζ potential and interfacial tension measurements showed that salt decreased the electrostatic repulsion of the anionic surfactant and allowed the surfactant to pack more densely at the oil−water interface. Dynamic interfacial tension measurements showed that surfactant adsorption rates increased with salt. As a result of faster adsorption kinetics, oscillating droplet tensiometry showed a decrease in the dilatational modulus when salt was present. An extended DLVO theory was used to calculate the interaction energy between droplets. These calculations agreed well with our experimental results indicating the importance of hydration forces at high salt concentrations and small droplet separation distances. The presence of salt allowed for close surfactant packing and faster surfactant adsorption kinetics, which prevented coalescence and created conditions favorable for the formation of a stable Newton black film.

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Section: Resultssupporting

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Results and Discussionmentioning

confidence: 99%

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Impact of Saltwater Environments on the Coalescence of Oil-in-Water Emulsions Stabilized by an Anionic Surfactant

et al. 2021

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“…Anton, et al, em 2013 apresentaram um estudo que contribui grandemente ao melhor entendimento da reologia bi-dimensional das monocamadas de surfactantes não iônicos a base de polietilenoglicol (PEG) adsorvidos na interface óleo-água. Mediante análises de modelos matemáticos confirmaram a existência da formação de uma rede bidimensional (gel interfacial) na monocamada de surfactante constituída por moléculas de estearato de PEG, com caraterísticas altamente elásticas (Anton et al, 2013 Método do anel de Du Noüy: É o método mais comumente usado, onde determina-se o valor da tensão superficial medindo a força necessária para tirar um anel de platina ou irídio da superfície de um líquido utilizando uma balança de torsão, tensiômetro. Se F é a força no anel, 2(2πr) γ cosθ ≈ βF, para θ = 0:…”

Section: Revisão Bibliográficaunclassified

Filmes De Langmuir De Ésteres De Polietilenoglicol Derivados De Ácidos Graxos

COLLAZOS¹

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Starting Up Microbial Enhanced Oil Recovery

Siegert

Sitte

Galushko

et al. 2013

Geobiotechnology II

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This chapter gives the reader a practical introduction into microbial enhanced oil recovery (MEOR) including the microbial production of natural gas from oil. Decision makers who consider the use of one of these technologies are provided with the required scientific background as well as with practical advice for upgrading an existing laboratory in order to conduct microbiological experiments. We believe that the conversion of residual oil into natural gas (methane) and the in situ production of biosurfactants are the most promising approaches for MEOR and therefore focus on these topics. Moreover, we give an introduction to the microbiology of oilfields and demonstrate that in situ microorganisms as well as injected cultures can help displace unrecoverable oil in place (OIP). After an initial research phase, the enhanced oil recovery (EOR) manager must decide whether MEOR would be economical. MEOR generally improves oil production but the increment may not justify the investment. Therefore, we provide a brief economical assessment at the end of this chapter. We describe the necessary state-of-the-art scientific equipment to guide EOR managers towards an appropriate MEOR strategy. Because it is inevitable to characterize the microbial community of an oilfield that should be treated using MEOR techniques, we describe three complementary start-up approaches. These are: (i) culturing methods, (ii) the characterization of microbial communities and possible bio-geochemical pathways by using molecular biology methods, and (iii) interfacial tension measurements. In conclusion, we hope that this chapter will facilitate a decision on whether to launch MEOR activities. We also provide an update on relevant literature for experienced MEOR researchers and oilfield operators. Microbiologists will learn about basic principles of interface physics needed to study the impact of microorganisms living on oil droplets. Last but not least, students and technicians trying to understand processes in oilfields and the techniques to examine them will, we hope, find a valuable source of information in this review.

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Dilatational rheology of a gel point network formed by nonionic soluble surfactants at the oil–water interface

Cited by 16 publications

References 27 publications

Impact of Saltwater Environments on the Coalescence of Oil-in-Water Emulsions Stabilized by an Anionic Surfactant

Impact of Saltwater Environments on the Coalescence of Oil-in-Water Emulsions Stabilized by an Anionic Surfactant

Filmes De Langmuir De Ésteres De Polietilenoglicol Derivados De Ácidos Graxos

Starting Up Microbial Enhanced Oil Recovery

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