A new method to study evaporation of sessile drop from permeable surfaces

Shrikanth, V; Archana, S; Bobji, M. S.

doi:10.1088/1361-6501/ab16b3

Cited by 8 publications

(9 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When the droplet includes no surfactant, the CL recedes smoothly and the contact angle is nearly unchanged during evaporation (see the black lines in panels a and b of Figure ). This corresponds to the situation of a CCA evaporation process that has been observed in many previous experimental studies. − …”

Section: Resultsmentioning

confidence: 55%

“…Two idealized models have been proposed for the shape evolution of an evaporating droplet: constant contact radius (CCR) model (also known as constant contact area model) and constant contact angle (CCA) model. In reality, they are mixed; − as the droplet evaporates, the evolution mode changes from CCR to CCA (or vice versa) or both contact angle and contact radius change simultaneously. However, a quantitative theory, which describes such phenomena, is still missing.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Drying Droplets with Soluble Surfactants

Man

et al. 2019

Langmuir

View full text Add to dashboard Cite

We propose a theory for the drying of liquid droplets of surfactant solutions. We show that the added surfactant hinders droplet receding and facilitates droplet spreading, causing a complex behavior of the contact line of an evaporating droplet: the contact line first recedes, then advances, and finally recedes again. We also show that the surfactant can change the deposition pattern from mountainlike to volcano-like and then to coffee-ring-like. Specially, when the contact line motion undergoes a clear receding− advancing transition, a two-ring pattern is formed. The mechanism of the two-ring formation is different from the stick−slip mechanism proposed previously and may be tested experimentally.

show abstract

Section: Resultsmentioning

confidence: 55%

Section: Introductionmentioning

confidence: 99%

Drying Droplets with Soluble Surfactants

Man

et al. 2019

Langmuir

View full text Add to dashboard Cite

show abstract

“…It has been reported that in such situation, the contact angle often shows quasi-stationary, apparent contact angle θ app . The phenomena has been studied extensively by experiments and simulation [10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Contact Angle of an Evaporating Droplet of Binary Solution on a Super Wetting Surface

Wu,

Doi,

Man

2021

Preprint

View full text Add to dashboard Cite

We study the dynamics of contact angle of a droplet of binary solution evaporating on a super wetting surface. Recent experiments show that although equilibrium contact angle of such droplet is zero, the contract angle can show complex time dependence before reaching the equilibrium value.We analyse such phenomena by extending our previous theory for the dynamics of an evaporating single component droplet to double component droplet. We show that the time dependence of the contact angle can be quite complex. Typically, it first decreases slightly, and then increases and finally decreases again. Under certain conditions, we find that the contact angle remains constant over a certain period of time during evaporation. We study how the plateau or peak contact angle depends on the initial composition and the humidity. The theory explains experimental results reported previously.

show abstract

“…The drying of droplets of particle suspensions and polymer solutions on substrates can produce rich deposition patterns, [1,2] including coffee-ring, [3,4] mountainlike, [5][6][7] volcanolike, [8,9] and multi-ring patterns. [10] The drying of liquid droplets is a common phenomenon in daily life, and has practical applications such as inkjet printing, [11] pesticide spraying, [12] semiconductor industry production, [13] etc. The dynamics of droplet evaporation therefore has long been of special interest in scientific research.…”

Section: Introductionmentioning

confidence: 99%

“…Evaporating droplets show complex shape evolution modes that the contact radius can increase or decrease with time under different conditions. [14][15][16][17][18][19][20][21] In 1977, Picknett and Bexon [14] reported on the mass and profile evolution of a slowly evaporating liquid (methyl acetoacetate) drop on a polytetrafluoroethylene (PTFE) surface in still air. They distinguished three evaporation modes: constant contact radius (CCR) mode, constant contact angle (CCA) mode, and mixed mode which changes from one to the other at some point or both contact angle and contact radius change simultaneously.…”

Section: Introductionmentioning

confidence: 99%

The drying of liquid droplets*

Jiang¹,

Yang²,

Wu³

et al. 2020

Chinese Phys. B

View full text Add to dashboard Cite

The drying of liquid droplets is a common phenomenon in daily life, and has long attracted special interest in scientific research. We propose a simple model to quantify the shape evolution of drying droplets. The model takes into account the friction constant between the contact line (CL) and the substrate, the capillary forces, and the evaporation rate. Two typical evaporation processes observed in experiments, i.e., the constant contact radius (CCR) and the constant contact angle (CCA), are demonstrated by the model. Moreover, the simple model shows complicated evaporation dynamics, for example, the CL first spreads and then recedes during evaporation. Analytical models of no evaporation, CCR, and CCA cases are given, respectively. The scaling law of the CL or the contact angle as a function of time obtained by analytical model is consistent with the full numerical model, and they are all subjected to experimental tests. The general model facilitates a quantitative understanding of the physical mechanism underlying the drying of liquid droplets.

show abstract

A new method to study evaporation of sessile drop from permeable surfaces

Cited by 8 publications

References 47 publications

Drying Droplets with Soluble Surfactants

Drying Droplets with Soluble Surfactants

Contact Angle of an Evaporating Droplet of Binary Solution on a Super Wetting Surface

The drying of liquid droplets*

Contact Info

Product

Resources

About