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Schroën K, Deng B, Berton-Carabin C, Marze S, Corstens M, Hinderink E. Microfluidics-based observations to monitor dynamic processes occurring in food emulsions and foams. Curr Opin Food Sci 2023. [DOI: 10.1016/j.cofs.2023.100989] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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Takács D, Péter T, Vargáné Árok Z, Katana B, Papović S, Gadzuric S, Vraneš M, Szilágyi I. Structure-Stability Relationship in Aqueous Colloids of Latex Particles and Gemini Surfactants. J Phys Chem B 2022; 126:9095-9104. [PMID: 36287607 PMCID: PMC9910321 DOI: 10.1021/acs.jpcb.2c06259] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
The influence of gemini surfactants (GSs) on the charging and aggregation features of anionic sulfate modified latex (SL) particles was investigated by light scattering techniques in aqueous dispersions. The GSs of short alkyl chains (2-4-2 and 4-4-4) resembled simple inert salts and aggregated the particles by charge screening. The adsorption of GSs of longer alkyl chains (8-4-8, 12-4-12, and 12-6-12) on SL led to charge neutralization and overcharging of the particles, giving rise to destabilization and restabilization of the dispersions, respectively. The comparison of the interfacial behavior of dimeric and the corresponding monomeric surfactants revealed that the former shows a more profound influence on the colloidal stability due to the presence of double positively charged head groups and hydrophobic tails, which is favorable to enhancing both electrostatic and hydrophobic particle-GS and GS-GS interactions at the interface. The different extent of the particle-GS interactions was responsible for the variation of the GS destabilization power, following the 2-4-2 < 4-4-4 < 8-4-8 < 12-4-12 order, while the length of the GS spacer did not affect the adsorption and aggregation processes. The valence of the background salts strongly influenced the stability of the SL-GS dispersions through altering the electrostatic interactions, which was more pronounced for multivalent counterions. These findings indicate that both electrostatic and hydrophobic effects play crucial roles in the adsorption of GSs on oppositely charged particles and in the corresponding aggregation mechanism. The major interparticle forces can be adjusted by changing the structure and concentration of the GSs and inorganic electrolytes present in the systems.
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Affiliation(s)
- Dóra Takács
- MTA-SZTE
Lendület Biocolloids Research Group, Department of Physical
Chemistry and Materials Science, University
of Szeged, 6720Szeged, Hungary
| | - Tamás Péter
- MTA-SZTE
Lendület Biocolloids Research Group, Department of Physical
Chemistry and Materials Science, University
of Szeged, 6720Szeged, Hungary
| | - Zsófia Vargáné Árok
- MTA-SZTE
Lendület Biocolloids Research Group, Department of Physical
Chemistry and Materials Science, University
of Szeged, 6720Szeged, Hungary
| | - Bojana Katana
- MTA-SZTE
Lendület Biocolloids Research Group, Department of Physical
Chemistry and Materials Science, University
of Szeged, 6720Szeged, Hungary
| | - Snežana Papović
- Department
of Chemistry, Biochemistry and Environmental Protection, Faculty of
Sciences, University of Novi Sad, 21 000Novi Sad, Serbia
| | - Slobodan Gadzuric
- Department
of Chemistry, Biochemistry and Environmental Protection, Faculty of
Sciences, University of Novi Sad, 21 000Novi Sad, Serbia
| | - Milan Vraneš
- Department
of Chemistry, Biochemistry and Environmental Protection, Faculty of
Sciences, University of Novi Sad, 21 000Novi Sad, Serbia
| | - István Szilágyi
- MTA-SZTE
Lendület Biocolloids Research Group, Department of Physical
Chemistry and Materials Science, University
of Szeged, 6720Szeged, Hungary,
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Deng B, Schroën K, Steegmans M, de Ruiter J. Capillary pressure-based measurement of dynamic interfacial tension in a spontaneous microfluidic sensor. LAB ON A CHIP 2022; 22:3860-3868. [PMID: 36103197 DOI: 10.1039/d2lc00545j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
The size of droplets and bubbles, and the properties of emulsions and foams strongly depend on dynamic interfacial tension (γd) - a parameter that is often inaccessible due to the very short time scales for droplet and bubble formation, and the inaccessibility of (e.g., food) production lines. To solve this challenge, we developed a microfluidic tensiometer that can measure γd by monitoring the formation time of both droplets and bubbles. Our tensiometer is a pressure-driven microfluidic device that operates based on the principle of a pressure balance: the formation of a droplet (or a bubble) is initialized when the Laplace pressure of the interface is decreased below the externally applied pressure, and this decrease is caused by a reduction in γd that can be calculated from the applied pressure and the Young-Laplace equation. The decay of γd due to surfactant adsorption can be followed at the characteristic time scale, which is dependent on surfactant type and concentration. For 0.05-1% wt sodium dodecyl sulfate (SDS), we were able to measure γd at time scales down to 1 ms and 0.1 ms for droplet and bubble interfaces, respectively, at increasing applied pressures and SDS concentrations. Our tensiometer proves to be a simple, robust method that inherently allows access to nearly the full range of dynamic interfacial tension at relevant time scales.
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Affiliation(s)
- Boxin Deng
- Wageningen University, Food Process Engineering Group, Bornse Weilanden 9, 6708, WG, Wageningen, The Netherlands.
| | - Karin Schroën
- Wageningen University, Food Process Engineering Group, Bornse Weilanden 9, 6708, WG, Wageningen, The Netherlands.
| | - Maartje Steegmans
- FrieslandCampina, Stationsplein 4, 3818 LE, Amersfoort, The Netherlands
| | - Jolet de Ruiter
- Wageningen University, Food Process Engineering Group, Bornse Weilanden 9, 6708, WG, Wageningen, The Netherlands.
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Pawliszak P, Ulaganathan V, Bradshaw-Hajek BH, Miller R, Beattie DA, Krasowska M. Can small air bubbles probe very low frother concentration faster? SOFT MATTER 2021; 17:9916-9925. [PMID: 34672316 DOI: 10.1039/d1sm01318a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
The existing literature on the rise velocities of air bubbles in aqueous surfactant solutions adsorbing at the water-air interface focuses mainly on large bubbles (D > 1.2 mm). In addition, due to the way the bubbles in rising bubble experiments are formed, their size is dependent on interfacial tension (the lower the interfacial tension the smaller the bubble). In this paper, smaller air bubbles (D < 505 ± 3 μm) are used to investigate the effect of the bubble size on the detection of two flotation frothers of different adsorption kinetics via bubble rise velocity measurements. We use an alternative method for bubble generation, allowing us to compare the rise velocity of bubbles of the same size in solutions of frothers of varying bulk concentration. The approach taken (ensuring consistent bubble size) ascertains that the buoyancy force component is kept constant when comparing the different solutions. As a consequence, any variations in the bubble rise velocity can be related to changes in the hydrodynamic drag force acting on a rising bubble. The interfacial behavior of frothers, i.e. the adsorption kinetics, interfacial activity and the maximum amount of molecules adsorbed at the interface, are determined from interfacial tension measurements and adsorption isotherms. The differences in the degree of tangential immobilisation caused by two different frothers are discussed in the context of differences in the structure of the dynamic adsorption layer, which is formed during the bubble rise.
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Affiliation(s)
- Piotr Pawliszak
- Future Industries Institute, UniSA STEM, University of South Australia, Mawson Lakes, SA 5095, Australia.
| | - Vamseekrishna Ulaganathan
- Future Industries Institute, UniSA STEM, University of South Australia, Mawson Lakes, SA 5095, Australia.
| | | | - Reinhard Miller
- Condensed Matter Physics, Technical University of Darmstadt, 64289 Darmstadt, Germany
| | - David A Beattie
- Future Industries Institute, UniSA STEM, University of South Australia, Mawson Lakes, SA 5095, Australia.
- ARC Centre of Excellence for Enabling Eco-Efficient Beneficiation of Minerals, Australia
- ARC Training Centre for Integrated Operations for Complex Resources, Australia
| | - Marta Krasowska
- Future Industries Institute, UniSA STEM, University of South Australia, Mawson Lakes, SA 5095, Australia.
- ARC Centre of Excellence for Enabling Eco-Efficient Beneficiation of Minerals, Australia
- ARC Training Centre for Integrated Operations for Complex Resources, Australia
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Farooq U, Liu Y, Li P, Deng Z, Liu X, Zhou W, Yi S, Rong N, Meng L, Niu L, Zheng H. Acoustofluidic dynamic interfacial tensiometry. THE JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA 2021; 150:3608. [PMID: 34852573 DOI: 10.1121/10.0007161] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/15/2021] [Accepted: 10/20/2021] [Indexed: 06/13/2023]
Abstract
The interfacial tension (IFT) of fluids plays an essential role in industrial, biomedical, and synthetic chemistry applications; however, measuring IFT at ultralow volumes is challenging. Here, we report a novel method for sessile drop tensiometry using surface acoustic waves (SAWs). The IFT of the fluids was determined by acquiring the silhouette of an axisymmetric sessile drop and applying iterative fitting using Taylor's deformation equation. Owing to physiochemical differences, upon interacting with acoustic waves, each microfluid has a different streaming velocity. This streaming velocity dictates any subsequent changes in droplet shape (i.e., height and width). We demonstrate the effectiveness of the proposed SAW-based tensiometry technique using blood plasma to screen for high leptin levels. The proposed device can measure the IFT of microscale liquid volumes (up to 1 μL) with an error margin of only ±5% (at 25 °C), which deviates from previous reported results. As such, this method provides pathologists with a solution for the pre-diagnosis of various blood-related diseases.
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Affiliation(s)
- Umar Farooq
- Paul C. Lauterbur Research Center for Biomedical Imaging, Institute of Biomedical and Health Engineering, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, 1068 Xueyuan Avenue, Shenzhen 518055, China
| | - Yuanting Liu
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Pengqi Li
- Paul C. Lauterbur Research Center for Biomedical Imaging, Institute of Biomedical and Health Engineering, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, 1068 Xueyuan Avenue, Shenzhen 518055, China
| | - Zhiting Deng
- Paul C. Lauterbur Research Center for Biomedical Imaging, Institute of Biomedical and Health Engineering, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, 1068 Xueyuan Avenue, Shenzhen 518055, China
| | - Xiufang Liu
- Paul C. Lauterbur Research Center for Biomedical Imaging, Institute of Biomedical and Health Engineering, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, 1068 Xueyuan Avenue, Shenzhen 518055, China
| | - Wei Zhou
- Paul C. Lauterbur Research Center for Biomedical Imaging, Institute of Biomedical and Health Engineering, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, 1068 Xueyuan Avenue, Shenzhen 518055, China
| | - Shasha Yi
- Paul C. Lauterbur Research Center for Biomedical Imaging, Institute of Biomedical and Health Engineering, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, 1068 Xueyuan Avenue, Shenzhen 518055, China
| | - Ning Rong
- Paul C. Lauterbur Research Center for Biomedical Imaging, Institute of Biomedical and Health Engineering, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, 1068 Xueyuan Avenue, Shenzhen 518055, China
| | - Long Meng
- Paul C. Lauterbur Research Center for Biomedical Imaging, Institute of Biomedical and Health Engineering, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, 1068 Xueyuan Avenue, Shenzhen 518055, China
| | - Lili Niu
- Paul C. Lauterbur Research Center for Biomedical Imaging, Institute of Biomedical and Health Engineering, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, 1068 Xueyuan Avenue, Shenzhen 518055, China
| | - Hairong Zheng
- Paul C. Lauterbur Research Center for Biomedical Imaging, Institute of Biomedical and Health Engineering, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, 1068 Xueyuan Avenue, Shenzhen 518055, China
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