A Review on the Evaporation Dynamics of Sessile Drops of Binary Mixtures: Challenges and Opportunities

Gurrala, Pradeep; Balusamy, Saravanan; Banerjee, Sayak; Sahu, Kirti Chandra

doi:10.32604/fdmp.2021.014126

Cited by 15 publications

(9 citation statements)

References 94 publications

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“…Recently, evaporation dynamics of multicomponent fluids have attracted attention of researchers due of their relevance in many practical applications. 38−41 An extensive review of the recent literature on this subject can be found in ref 42. The effects of colloidal nanoparticle concentration on evaporation dynamics of sessile droplets of binary mixtures have also been studied.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Recently, evaporation dynamics of multicomponent fluids have attracted attention of researchers due of their relevance in many practical applications. − An extensive review of the recent literature on this subject can be found in ref . The effects of colloidal nanoparticle concentration on evaporation dynamics of sessile droplets of binary mixtures have also been studied. − Petre and Azouni observed an inverse Marangoni effect in sessile droplets of aqueous alcohol solutions that show a nonmonotonic dependency of surface tension with temperature.…”

Section: Introductionmentioning

confidence: 99%

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Evaporation Dynamics of a Sessile Droplet of Binary Mixture Laden with Nanoparticles

et al. 2021

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We investigate the evaporation dynamics of a sessile droplet of ethanol–water binary mixtures of different compositions laden with alumina nanoparticles and compare with the no-loading condition at different substrate temperatures. Shadowgraphy and infrared imaging methods are used, and the experimental images are postprocessed using a machine learning technique. We found that the loading and no-loading cases display distinct wetting and contact angle dynamics. Although the wetting diameter of a droplet decreases monotonically in the absence of loading, the droplet with 0.6 wt % nanoparticle loading remains pinned for the majority of its lifetime. The temporal variation of the normalized droplet volume in the no-loading case has two distinct slopes, with ethanol and water phases dominating the early and late stages of evaporation, respectively. The normalized droplet volume with 0.6 wt % loading displays a nearly linear behavior because of the increase in the heat transfer rate. Our results from infrared imaging reveal that a nanofluid droplet displays far richer thermal patterns than a droplet without nanoparticle loading. In nanoparticle-laden droplets, the pinning effect, as well as the resulting thermo-capillary and thermo-solutal convection, causes more intense internal mixing and a faster evaporation rate. Finally, a theoretical model is also developed that satisfactorily predicts the evaporation dynamics of binary nanofluid droplets.

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Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evaporation Dynamics of a Sessile Droplet of Binary Mixture Laden with Nanoparticles

et al. 2021

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“…Analysis of evaporating droplets (spherical, pendant, or sessile) of simple liquids − or drops consisting of binary mixtures , is an intensive research field. Theoretical models of evaporation involve consideration of heat as well as mass transfer as a result of the convective transport and evaporation flux. , Evaporation of binary liquid drops was found to be much more complicated than that of pure liquids.…”

Section: Resultsmentioning

confidence: 99%

“…The spreading of a sessile drop can either be accelerated or retarded depending on the time scale of the process as well as on the concentration of the volatile component . Importantly, these effects have been detected at a time scale of microsecond to second, much shorter than in the earlier studies on the wetting and evaporation dynamics of volatile binary sessile drops of, e.g., water–ethanol solutions, also under variation of the ambient total pressure. − Presumably, in the case of poorly soluble amphiphilic aroma molecules, their fast adsorption–desorption behavior leads to fast changes in the surface tension at the air–liquid interface, dominating over possible effects of the environmental instabilities (temperature or humidity) on the wetting and evaporation of drops.…”

Section: Introductionmentioning

confidence: 97%

Volatile Aroma Surfactants: The Evaluation of the Adsorption–Evaporation Behavior under Dynamic and Equilibrium Conditions

et al. 2022

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Multicomponent heterogeneous systems containing volatile amphiphiles are relevant to the fields ranging from drug delivery to atmospheric science. Research presented here discloses the individual interfacial activity and adsorption–evaporation behavior of amphiphilic aroma molecules at the liquid–vapor interface. The surface tension of solutions of nonmicellar volatile surfactants linalool and benzyl acetate, fragrances as such, was compared with that of the conventional surfactant sodium dodecyl sulfate (SDS) under equilibrium as well as under no instantaneous equilibrium, including a fast-adsorbing regime. In open systems, the increase in the surface tension on a time scale of ∼10 min is evaluated using a phenomenological model. The derived characteristic mass transfer constant is shown to be specific to both the desorption mechanism and the chemistry of the volatile amphiphile. Fast-adsorbing behavior disclosed here, as well as the synergetic effect in the mixtures with conventional micellar surfactants, justifies the advantages of volatile amphiphiles as cosurfactants in dynamic interfacial processes. The demonstrated approach to derive specific material parameters of fragrance molecules can be used for an application-targeted selection of volatile cosurfactants, e.g., in emulsification and foaming, inkjet printing, microfluidics, spraying, and coating technologies.

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“…In this study we will focus on the emergence of Marangoni rings in droplets containing a mixture of two liquids. In such a binary droplet, the properties of the individual liquids, such as their volatility, mass density, surface tension, − and viscosity, determine the nature of the fluid flow. Mixtures of water and glycerol are of special interest, for instance in inkjet printing, laboratory studies, , and biological processes. , The high viscosity, miscibility in water, low cost, and non-toxic nature makes glycerol an excellent thickener for consumer products.…”

Section: Introductionmentioning

confidence: 99%

Evaporation of a Sessile Colloidal Water–Glycerol Droplet: Marangoni Ring Formation

Raju

Diddens

et al. 2022

Langmuir

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The transport and aggregation of particles in suspensions is an important process in many physicochemical and industrial processes. In this work, we study the transport of particles in an evaporating binary droplet. Surprisingly, the accumulation of particles occurs not only at the contact line (due to the coffee-stain effect) or at the solid substrate (due to sedimentation) but also at a particular radial position near the liquid–air interface, forming a “ring”, which we term as the Marangoni ring . The formation of this ring is primarily attributed to the solutal Marangoni flow triggered by the evaporation dynamics of the water–glycerol droplet. Experiments and simulations show fair agreement in the volume evolution and the general structure of the solutal Marangoni flow, that is, the Marangoni vortex . Experiments show that the location of the Marangoni ring is strongly correlated with the Marangoni vortex. However, finite element numerical simulations fail to describe the particle distribution seen in the experiments. Interestingly, the particles not only accumulate to form the Marangoni ring but also assemble as colloidal crystals close to the liquid–air interface, yielding iridescence. The formation of the colloidal crystals in the experiments is strong evidence that non-hydrodynamic interactions, which are not represented in the simulations, also play a significant role in our system.

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A Review on the Evaporation Dynamics of Sessile Drops of Binary Mixtures: Challenges and Opportunities

Cited by 15 publications

References 94 publications

Evaporation Dynamics of a Sessile Droplet of Binary Mixture Laden with Nanoparticles

Evaporation Dynamics of a Sessile Droplet of Binary Mixture Laden with Nanoparticles

Volatile Aroma Surfactants: The Evaluation of the Adsorption–Evaporation Behavior under Dynamic and Equilibrium Conditions

Evaporation of a Sessile Colloidal Water–Glycerol Droplet: Marangoni Ring Formation

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