Roles of interfacial dynamics in the interaction behaviours between deformable oil droplets

Jin, Hang; Wei, Wang; Liu, Fangyuan; Yu, Zhipeng; Chang, Hongli; Li, Kai; Gong, Junbo

doi:10.1016/j.ijmultiphaseflow.2017.04.009

Cited by 8 publications

(11 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This study draws primarily on the underwater wetting behavior of PEMs obtained by a LbL strategy. − The deposition of PDDA and PSS was initially accomplished on a silicon wafer. The atomic force microscopy (AFM) drop probe technique − was adopted for the direct measurement of the adhesion forces between microsized oil droplets and superoleophobic surfaces in aqueous solutions with high salinity. The measured adhesion forces between the oil droplet and PDDA/PSS-coated surface are found to be salinity-specific.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of the Salinity-Specific Adhesion Force between Oil Drop and Underwater Superoleophobic Polyelectrolyte Surfaces

Jin

Wang

et al. 2019

ACS Appl. Polym. Mater.

Self Cite

View full text Add to dashboard Cite

Creating surfaces with controlled superoleophobicity is of real significance for the manipulation, transportation, and self-cleaning of organic fluids of strategic importance. In the present work, particular attention is given to elucidate the superoleophobicity mechanism of surfaces coated with polyelectrolyte multilayers (PEMs) assembled by layer-by-layer deposition of the cationic polyelectrolyte polydiallyldimethylammonium chloride (PDDA) and the anionic polyelectrolyte poly(styrenesulfonate) (PSS) in 1.0 M NaCl solution. The atomic force microscopy (AFM) drop probe technique was used to measure the salinity-specific adhesion forces between the oil droplet and underwater polyelectrolyte PEM-coated surface. Meanwhile, topographic images of the fabricated PEMs in solutions with different ionic strengths were also obtained and compared. The results show that the fabricated (PDDA/ PSS) 1.5 , (PDDA/PSS) 3.5 , and (PDDA/PSS) 4.0 PEMs exhibit excellent oil repellency upon immersion into aqueous solutions with high salinity. Additionally, the underwater superoleophobicity of the prepared PEM films was well-demonstrated through AFM adhesion force measurements. It is proven in our study that the underwater superoleophobicity of the fabricated surface has a strong relationship with the salinity-specific behavior of deposited polyelectrolytes.

show abstract

Section: Introductionmentioning

confidence: 99%

Experimental Study of the Salinity-Specific Adhesion Force between Oil Drop and Underwater Superoleophobic Polyelectrolyte Surfaces

Jin

Wang

et al. 2019

ACS Appl. Polym. Mater.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Details of the computational methods are given in Supporting Information, Section S2. ,, In summary, first, the capability of our numerical approach to solve eq S21 from Supporting Information, Section S2, and calculate the results of oil-in-water experimental cases using conventionally included forces (vdW, EDL, and hydrodynamic forces) is assessed. It is worth mentioning that the inclusion of vdW and EDL forces results in the conventional Derjaguin–Landau–Verwey–Overbeek (DLVO) theory. − This step assures the accuracy of the implemented computational approach and its potential application for other types of systems.…”

Section: Methodsmentioning

confidence: 99%

Charge–Dipole Attraction as a Surface Interaction between Water Droplets Immersed in Organic Phases

Afsaneh

Elliott

2022

Langmuir

View full text Add to dashboard Cite

The dynamic behavior of emulsion droplets during their interactions with one another or with solid surfaces plays a paramount role in their ultimate stability in various applications. While the interaction of oil droplets through a surrounding aqueous phase is well understood, recent studies on the interaction of water droplets through a surrounding pure organic phase showed the presence of an unexplained attraction between water droplets at relatively long ranges. In this research study, we propose fixed-surface-charge−bulk-dipole attraction as a new interaction force between water-in-oil droplets and then derive an equation for its disjoining pressure. The behavior of water droplets in the presence and absence of this charge−dipole interaction was numerically quantified using the Stokes− Reynolds−Young−Laplace model and compared to the experimental data. Numerically calculated net force curves are in excellent agreement with experimental data from the literature when charge−dipole attraction is included, while they deviate in its absence. In addition, the water droplet and thin oil film profiles in the presence and absence of charge−dipole attraction were calculated and compared. This research indicates that charge−dipole attraction can adequately explain the mysterious force observed in some studies, which demonstrates its unexplored potential to capture the physical properties and dynamic behavior of water droplets in organic phases with useful implications to unravel unidentified interactions between emulsion droplets in different industries.

show abstract

“…According to the Szyszkowski-Langmuir equation as shown in Eq. ( 1), the surfactant concentration at the interface can be estimated if the data of the interfacial tension is acquired, 23,40,41…”

Section: Introductionmentioning

confidence: 99%

Laser induced fluorescence studies on the distribution of surfactants during drop/interface coalescence

2019

View full text Add to dashboard Cite

The spatiotemporal distribution of fluorescent surfactants on the merging interfaces during the coalescence of an aqueous drop with an organic/aqueous flat interface was studied experimentally with high-speed laser induced fluorescence. The aqueous phase was a 46% glycerol solution, while the organic phase was a 5 cSt silicone oil. A fluorescently tagged surfactant was used at a concentration of 0.001 mol/m 3 in the aqueous phase. To vary the concentration of surfactants on the interfaces, the drop and the flat interface were left to stand for different times before the coalescence experiments (different interface ages). It was found that when a drop rested on the interface, the surfactants adsorbed on the interfaces were swept outwards by the draining liquid film between the drop and the flat interface and reached a peak value at 0.75R h away from the centre of the film, where R h is the horizontal drop radius. After the film rupture, the concentration of the surfactants at the tip of the meniscus increased. Once the film had retracted, the concentration of the surfactants peaked at the meniscus at the bottom of the drop. As the liquid in the drop started to merge with its homophase, the drop formed a cylinder from the upward capillary waves on the drop surface. The surfactant concentration was found to be low at the top of the liquid cylinder as the interface was stretched by the convergence of the capillary waves. Subsequently, the cylinder began to shrink and the top part of the drop acquired a high surfactant concentration.

show abstract

Roles of interfacial dynamics in the interaction behaviours between deformable oil droplets

Cited by 8 publications

References 43 publications

Experimental Study of the Salinity-Specific Adhesion Force between Oil Drop and Underwater Superoleophobic Polyelectrolyte Surfaces

Experimental Study of the Salinity-Specific Adhesion Force between Oil Drop and Underwater Superoleophobic Polyelectrolyte Surfaces

Charge–Dipole Attraction as a Surface Interaction between Water Droplets Immersed in Organic Phases

Laser induced fluorescence studies on the distribution of surfactants during drop/interface coalescence

Contact Info

Product

Resources

About