Is the combination of two particles with different degrees of hydrophobicity an alternative method for tuning the average particle hydrophobicity?

Masalova, Irina; Tshilumbu, Nsenda Ngenda; Fester, Veruscha; Kharatyan, Ellina

doi:10.1016/j.molliq.2020.113444

Cited by 3 publications

(2 citation statements)

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“…The surface property of the particles can be characterized in terms of hydrophobicity index (HI), with more hydrophobic particles having higher HI . The hydrophobicity index of binary particles (HI) is the corresponding arithmetic average value of the hydrophobicity index of the two different particles at the interface, expressed as follows where HI 1 and HI 2 are the hydrophobicity indexes of particle I and particle II, respectively.…”

Section: Discussionmentioning

confidence: 99%

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Demulsification of Bacteria-Stabilized Pickering Emulsions Using Modified Silica Nanoparticles

Xie

Zhao

Zhang

et al. 2022

ACS Appl. Mater. Interfaces

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Pickering emulsions stabilized by bacteria acting as particle emulsifiers are new platforms for microbial transformations of hydrophobic chemicals. However, their high stability often hampers demulsification during downstream processing. Since the existing methods (like addition of surfactants) to demulsify bacteria-stabilized Pickering emulsions have negative effects, new practical methods need to be developed. Here, using chemically modified fumed silica particles with different hydrophobicity, the demulsification of W/O Pickering emulsions stabilized by Mycobacterium neoaurum whole cells was first studied. The binary particle-stabilized emulsions exhibited phase inversion and dewatering induced by the coalescence of W/O emulsions or creaming of O/W emulsions. The silica particle hydrophobicity and concentration were the important parameters influencing the emulsion type, droplet morphology, and dewatering rate. The highest dewatering rate and largest droplet size were obtained at the inversion point from W/O to O/W. Confocal microscopy showed that no interaction between the bacteria and silica particles existed and the silica particle adsorption at the interface induced the detachment of bacteria from the interface, revealing that there was competitive adsorption between the binary particles at the interface. Based on these results, we suggested that the average hydrophobicity of the binary particles at the interface would determine the emulsion type and stability. Finally, this strategy was successfully applied to the demulsification of the Pickering emulsion formed during microbial transformation of sterols. Overall, this study provides a new strategy to demulsify Pickering emulsions by addition of another particle emulsifier. This is also the first example of separation of products as well as organic phases after microbial transformation in Pickering emulsions.

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Section: Discussionmentioning

confidence: 99%

“…The hydrophobicity index of binary particles (HI) is the corresponding arithmetic average value of the hydrophobicity index of the two different particles at the interface, expressed as follows. 47 = + x x HI HI HI (1)…”

Section: Discussionmentioning

confidence: 99%