An experimental investigation of the interfacial tension between liquid-liquid mixtures in the presence of surfactants

Sinzato, Yuri Zeniti; Dias, Nuno Jorge Sousa; Cunha, Francisco Ricardo

doi:10.1016/j.expthermflusci.2017.03.011

Cited by 28 publications

(12 citation statements)

References 27 publications

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“…These reports show droplet, slug, parallel, or annular flows depending on the conditions employed. Investigation concerning a liquid-liquid interface in microfluidic flow has been interesting and attractive in Lab-on-aChip and μ-TAS research area [7] [8] [9]. However, to our knowledge, there have been no reports regarding capillary chromatography taking advantage of liquid-liquid interfaces based on such multiphase flows.…”

Section: Introductionmentioning

confidence: 99%

Microfluidic Analytical System with On-Line Luminol Chemiluminescence Detection Based on Annular Flow of Phase Separation Multiphase Flow

Manai¹,

Nishiyama²,

Tsukagoshi³

2017

JASMI

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Microfluidic analytical system was developed based on annular flow of phase separation multiphase flow with a ternary water-hydrophilic/hydrophobic organic solvent solution. The analytical system was combined with on-line luminol chemiluminescence detection for catechin analysis. The water (10 mM phosphate buffer, pH 7.3)-acetonitrile-ethyl acetate mixed solution (3:8:4, volume ratio) containing 60 μM luminol and 2 mM hydrogen peroxide as a carrier was fed into the capillary tube (open-tubular fused-silica, 75 μm inner diameter, 110 cm effective length) at a flow rate of 1.0 μL·min −1 . The carrier solution showed stable chemiluminescence as a baseline on the flow chart. Eight catechins were detected as negative peaks for their antioxidant potential with different detection times. The system was applied to analyze the amounts of catechin in commercially available green tea beverages.

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Section: Introductionmentioning

confidence: 99%

Microfluidic Analytical System with On-Line Luminol Chemiluminescence Detection Based on Annular Flow of Phase Separation Multiphase Flow

Manai¹,

Nishiyama²,

Tsukagoshi³

2017

JASMI

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“…The interfacial tension is a timedependent property for non-pure or mixed systems. Thus, droplets with differently aged interfacial area were formed such that the interfacial tension for infinite time inf can be derived (Wilkinson 1972;Sinzato et al 2017). Within our work, the droplet formation times and, therefore, the surface age range between 2.5 and 60 s.…”

Section: Determination Of Materials Propertiesmentioning

confidence: 89%

Refractive index matching (RIM) using double-binary liquid–liquid mixtures

et al. 2020

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For using microscopic multiphase flows in microreactors, an exact understanding of the underlying hydrodynamic interrelations is key for successful reactor layout and reaction control. To examine the local hydrodynamic behavior, non-invasive optical measurements techniques like particle tracking velocimetry (PTV) or micro particle image velocimetry (µPIV) are the methods of choice, since they provide precise velocity measurement with excellent spatial resolution. Such optical approaches require refractive index matching (RIM) of the involved flow phases to prevent optical distortion due to light refraction and reflection at the interfaces. Established RIM approaches often provide a single degree of freedom, which is sufficient to solely match the refractive index (RI) of the flow phases. Using these approaches, the material properties (Oh number) are fixed and the relevant dimensionless numbers (Ca, Re) may only be altered hydrodynamically or geometrically. To avoid expansive geometric scaling of the microchannels, we propose an approach using two binary mixtures (doublebinary mixtures) to introduce an additional degree of freedom. The approach allows examining liquid-liquid two-phase flows at a distinct velocity while being able to change the material properties (Oh number). Thus, Ca and Re can be chosen individually and the proposed RIM-approach provides undisturbed optical access. Furthermore, we present four different binary mixtures, which allow to vary the viscosity ratio of the phases. The relevant material parameters are successfully correlated to measurement data, which delivers a system of equations that determines the mass fractions and the velocities to address Re and Ca individually. A proof-of-principle for the proposed double-binary mixture RIM-approach is successfully established using µPIV raw images.

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“…The interfacial tension at a liquid-liquid interface is a crucial factor related to the study and characterization of emulsion stability. As an example, the introduction of surfactant molecules prevents the coalescence of oil droplets by reducing the interfacial tension of the mixture [39]. The surface tension curve for soybean oil containing XEHR is shown in Figure 5a, and the critical micelle concentration (CMC) value can be determined from the inflection point of this plot.…”

Section: Surface and Interfacial Tensionsmentioning

confidence: 99%

The Emulsifying Properties of Hydrogenated Rosin Xylitol Ester as a Biomass Surfactant for Food: Effect of pH and Salts

et al. 2020

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The xylitol ester of hydrogenated rosin (XEHR) was obtained for the first time from biomass-based hydrogenated rosin and xylitol using an environmentally friendly, high-pressure CO2 catalytic synthesis. This compound is intended for use as an emulsifier for food. Analyses by ICP-AES showed the absence of heavy metal residues in the product, such that it met food standards. Fourier transform infrared and nuclear magnetic resonance spectroscopies together with gel permeation chromatography confirmed the successful esterification and the formation of a monoester and diester with molar masses of 427 and 772 g/mol. The emulsification of water/soybean oil mixtures by adding the XEHR was assessed at pH values of 4, 6.86, and 10 and in the presence of NaCl, KCl, MgCl2, and CaCl2. The XEHR was found to act as an emulsifier by reducing the interfacial tension of such mixtures to less than 2 mN/m under all conditions. The highest emulsifying activity index (9.52 m2/g) and emulsifying stability index (94.53%) were obtained after adding MgCl2 (100 mM). Particle size and confocal microscopy showed that the presence of salts gave a more uniform droplet size and a finer emulsion structure. The high viscosities of the emulsions containing salts also suggested a more cohesive oil droplet network.

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An experimental investigation of the interfacial tension between liquid-liquid mixtures in the presence of surfactants

Cited by 28 publications

References 27 publications

Microfluidic Analytical System with On-Line Luminol Chemiluminescence Detection Based on Annular Flow of Phase Separation Multiphase Flow

Microfluidic Analytical System with On-Line Luminol Chemiluminescence Detection Based on Annular Flow of Phase Separation Multiphase Flow

Refractive index matching (RIM) using double-binary liquid–liquid mixtures

The Emulsifying Properties of Hydrogenated Rosin Xylitol Ester as a Biomass Surfactant for Food: Effect of pH and Salts

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