Changes in the interfacial tension with temperature and their effects on the particle size and stability of emulsions

Mitsui, Takeo; Nakamura, Shin; Harusawa, Fuminori; Machida, Yasuhiko

doi:10.1007/bf01507607

Cited by 14 publications

(5 citation statements)

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“…Moreover, the corresponding enhancement of solubility of crude oil with temperature (Fig.5) further illustrated the positive effect of temperature on enhancing biodegradability of crude oil. Nevertheless, the enhanced temperature had no effect on the interfacial tension, which well agrees with the previous results that the surfactant of 10-molecule ethoxylate caused no changes of the interfacial tension between water and liquid paraffin by regulating temperature (Mitsui et al, 1971). Overall, the bioavailability of petroleum pollutants was greatly enhanced via increasing solubility and decreasing the surface tension by rhamnolipids.…”

Section: Discussionsupporting

confidence: 81%

Biotreatment of oily wastewater by rhamnolipids in aerated active sludge system

Zhang

Long

Sha

et al. 2009

J. Zhejiang Univ. Sci. B

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Abstract:Oily wastewater generated by various industries creates a major ecological problem throughout the world. The traditional methods for the oily wastewater treatment are inefficient and costly. Surfactants can promote the biodegradation of petroleum hydrocarbons by dispersing oil into aqueous environment. In the present study, we applied rhamnolipid-containing cell-free culture broth to enhance the biodegradation of crude oil and lubricating oil in a conventional aerobically-activated sludge system. At 20 °C, rhamnolipids (11.2 mg/L) increased the removal efficiency of crude oil from 17.7% (in the absence of rhamnolipids) to 63%. At 25 °C, the removal efficiency of crude oil was over 80% with the presence of rhamnolipids compared with 22.3% in the absence of rhamnolipids. Similarly, rhamnolipid treatment (22.5 mg/L) for 24 h at 20 °C significantly increased the removal rate of lubricating oil to 92% compared with 24% in the absence of rhamnolipids. The enhanced removal of hydrocarbons was mainly attributed to the improved solubility and the reduced interfacial tension by rhamnolipids. We conclude that a direct application of the crude rhamnolipid solution from cell culture is effective and economic in removing oily contaminants from wastewater.

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Section: Discussionsupporting

confidence: 81%

Biotreatment of oily wastewater by rhamnolipids in aerated active sludge system

Zhang

Long

Sha

et al. 2009

J. Zhejiang Univ. Sci. B

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“…It has been reported that the hydration force is inversely dependent on temperature. − Tadros stated that increasing temperature of the nonionic surfactant solutions causes dehydration of the POE chain, which results in less interactions with water molecules. This is manifested in the cloudiness of the solution.…”

Section: Resultsmentioning

confidence: 99%

A Systematic Study on the Impact of Surfactant Chain Length on Dynamic Interfacial Properties in Porous Media: Implications for Enhanced Oil Recovery

Mirchi

Saraji

Akbarabadi

et al. 2017

Ind. Eng. Chem. Res.

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We propose a new systematic procedure to investigate the effect of hydrophobic and hydrophilic chain lengths of polyoxyethylenated (POE) nonionic surfactants on dynamic interfacial properties in porous media. We study the impact of nonionic surfactant structure on oil recovery through comprehensive experimental measurements of phase behavior, cloud point, dynamic interfacial tension, dynamic contact angle, and spontaneous and forced imbibitions at ambient and reservoir conditions. We identify a surfactant structure that increased the oil production by 22% and 6% compared to tap water and a nonionic surfactant commercially deployed in a major unconventional oil reservoir, respectively. In this work, we observe that factors such as minimum interfacial tension used for surfactant selection are not the only parameters influencing displacements at the pore scale. The results of this study reveal that when a surfactant solution imbibes into the pore space as an invading phase, the surfactant ability to lower the IFT and reach equilibrium faster plays an important role in the local trapping of oil phase on a pore-by-pore basis. We propose a mechanism relating this surfactant behavior to oil−brine displacement and confirm our results by visual observation of in situ pore fluid occupancies after surfactant imbibition in micromodels and naturally occurring porous media.

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“…The temperature effects are influenced by the number of EO units in individual surfactant molecules. Mitsui and co-workers [29] found that when the number of moles of EO contained in a surfactant changes, the interfacial tension would change with temperature in a different manner. However, only a single ethylene oxide head group was present for these surfactants, in contrast with polysorbate 80.…”

Section: Emulsions Formation and Stabilitymentioning

confidence: 98%