Sessile nanofluid droplet drying

Zhong, Xin; Crivoi, Alexandru; Duan, Fei

doi:10.1016/j.cis.2014.12.003

Cited by 133 publications

(107 citation statements)

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“…They stated that the geometric constraint of the droplet was responsible for the formation of capillary forces on the large particles, which are in the opposite direction as the outward capillary flow, near the contact line, thus repelling the "coffee-ring" effect [20]. These capillary forces were proportional to the size of the suspended particles, while inversely proportional to the contact angle of the droplet [20,21]. Recently, Eral et al showed that the application of electrical potential on the sessile drops, containing DNA solution and colloidal particles of various sizes, could suppress the "coffee ring" effect.…”

Section: Advances In Colloid Sciencementioning

confidence: 99%

“…This leads to the formation of various interesting patterns in the dried droplets, which is termed as the desiccation patterns. They are mainly composed of ringstain patterns, cracking patterns, crystal patterns, and combined patterns [7,21]. These desiccation patterns are widely observed in the sessile drops of biofluids and nanofluids.…”

Section: Wetting and Drying Of Colloidal Droplets: Pattern Formationmentioning

confidence: 99%

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Wetting and Drying of Colloidal Droplets: Physics and Pattern Formation

Chen¹,

Zhang²,

Zang³

et al. 2016

Advances in Colloid Science

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When a colloidal droplet is deposited on a solid substrate at ambient condition, it will experience the processes of wetting and drying spontaneously. These ostensibly simple and ubiquitous processes involve numerous physics: droplet spreading and wetting, three-phase contact line motion, flow fields inside droplets, and mass transportation within droplets during drying. Meanwhile, the continuous evaporation of liquid produces inter-and/or intra-molecular interactions among suspended materials and builds up the internal stress within droplets. After drying, interesting and complex desiccation patterns form in the dried droplets. These desiccation patterns are believed to have wide applications, e.g., medical diagnosis. However, many potential applications are limited by the current understanding of wetting and drying of colloidal droplets. This chapter focuses on the complex physics associated with these processes and the pattern formation in the dried colloidal droplets. Moreover, potential applications of these desiccation patterns and prospective works of wetting and drying of the colloidal droplets are outlined in this chapter.

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Section: Advances In Colloid Sciencementioning

confidence: 99%

Section: Wetting and Drying Of Colloidal Droplets: Pattern Formationmentioning

confidence: 99%

Wetting and Drying of Colloidal Droplets: Physics and Pattern Formation

Chen¹,

Zhang²,

Zang³

et al. 2016

Advances in Colloid Science

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“…To observe how the microstructures are formed under room conditions, a microscope is usually used to monitor the drying process of a droplet on the microscope slide . The drying dynamics of a sessile droplet on a solid surface generally involves in two stages: pinning and depinning .…”

Section: Introductionmentioning

confidence: 99%

“…45,46 The drying dynamics of a sessile droplet on a solid surface generally involves in two stages: pinning and depinning. 46,47 During the first stage, a small amount of the liquid in the sessile droplet is evaporated, while the three-phase contact line, which touches the solid, liquid, and gas phases, is pinned (or fixed, not moving) with a decreasing contact angle during drying processes. 43 This stage is also known as the "pining stage," and its pining time and diameter depend on the nature of the liquid, surface properties of the substrates, and evaporating conditions.…”

Section: Introductionmentioning

confidence: 99%

The effect of ink dilution and evaporation on the microstructures of catalyst layers in polymer electrolyte membrane fuel cells

Zhao

Liu

2019

Int J Energy Res

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SUMMARY The microstructures of catalyst layers (CLs) in proton exchange membrane fuel cells determine cell performance and durability. Delicate ink preparation processes and coating/drying processes affect the resulting microstructures including active sites, pore networks, ionomer networks and Pt/C networks. This paper reports our recent experimental observations of the effect of ink dilution and evaporation condition on the microstructures. The microstructures of dried ink droplets are presented and compared among different dilution ratios and different evaporation conditions in terms of the spatial distributions of Pt/C particles, ionomers, and pores. The method through which the microstructures are visualized is also introduced in this paper. It is observed that ink dilution ratio and evaporation condition can significantly alter resulting microstructure patterns through affecting viscosity and particle flow patterns during the evaporation. More concentrated solution makes catalyst inks less spread out on a substrate surface, leading to larger droplet height and larger contact angle. Ambient relative humidity has a significant impact on catalyst deposition patterns. Under low relative humidity condition, catalyst particles are concentrated both near the central and the periphery of the droplet; while under high relative humidity, the central part is uniform, and the particles move towards the edge of the deposition, forming a stripe‐like structure. This indicates that ink dilution and evaporation is key to the CL microstructure formation and must be properly controlled in order to obtain the quality and consistency of the CLs in fabrication.

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“…Further details of the coffee-ring effect can be found in several recent review articles. [10][11][12] The instant freezing step in FVD minimizes the evaporation-drive flux by instantly fixing the sample-matrix mixture on the MALDI plate, resulting in a uniform distribution of crystal structures. Figure 1 shows a schematic diagram comparing FVD and conventional drying processes.…”

mentioning

confidence: 99%