Spreading and bouncing of liquid alkane droplets upon impacting on a heated surface

Qin, Mengxiao; Tang, Chenglong; Zhang, Peng; Huang, Zuohua

doi:10.1016/j.ijheatmasstransfer.2020.120076

“… [42] To be specific, the larger vapor bubbles will coalesce to construct vapor pockets preventing a close contact between the substrate surface and the droplet thus triggering the levitation of small satellite droplets at 18 ms (Figure 4k). [43–44] As a consequence, the wetting area becomes smaller than the spreading radius (Figure 4m‐II). The droplet performs a partial wetting state with turbulent motion, which increases conductive thermal resistance, suggesting the manifestation of the transition boiling state at 110 °C [45–46] .…”

Section: Resultsmentioning

confidence: 99%

Tuning the Stacking Modes of Ultrathin Two‐Dimensional Metal–Organic Framework Nanosheet Membranes for Highly Efficient Hydrogen Separation

Song,

Wang,

Zhao

et al. 2023

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Two‐dimensional (2D) metal‐organic framework (MOF) membranes are considered potential gas separation membranes of the next generation due to their structural diversity and geometrical functionality. However, achieving a rational structure design for a 2D MOF membrane and understanding the impact of MOF nanosheet stacking modes on membrane separation performance remain challenging tasks. Here, we report a novel kind of 2D MOF membrane based on [Cu2Br(IN)2]n (IN = isonicotinato) nanosheets and propose that synergetic stacking modes of nanosheets have a significant influence on gas separation performance. The stacking of the 2D MOF nanosheets is controlled by solvent droplet dynamic behaviors at different temperatures of drop coating. Our 2D MOF nanosheet membranes exhibit high gas separation performances for H2/CH4 (selectivity > 290 with H2 permeance > 520 GPU) and H2/CO2 (selectivity > 190 with H2 permeance > 590 GPU) surpassing the Robeson upper bounds, paving a potential way for eco‐friendly H2 separation.

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“… [42] To be specific, the larger vapor bubbles will coalesce to construct vapor pockets preventing a close contact between the substrate surface and the droplet thus triggering the levitation of small satellite droplets at 18 ms (Figure 4k). [43–44] As a consequence, the wetting area becomes smaller than the spreading radius (Figure 4m‐II). The droplet performs a partial wetting state with turbulent motion, which increases conductive thermal resistance, suggesting the manifestation of the transition boiling state at 110 °C [45–46] .…”

Section: Resultsmentioning

confidence: 99%

Tuning the Stacking Modes of Ultrathin Two‐Dimensional Metal–Organic Framework Nanosheet Membranes for Highly Efficient Hydrogen Separation

Song,

Wang,

Zhao

et al. 2023

Angewandte Chemie

1

0

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Two‐dimensional (2D) metal‐organic framework (MOF) membranes are considered potential gas separation membranes of the next generation due to their structural diversity and geometrical functionality. However, achieving a rational structure design for a 2D MOF membrane and understanding the impact of MOF nanosheet stacking modes on membrane separation performance remain challenging tasks. Here, we report a novel kind of 2D MOF membrane based on [Cu2Br(IN)2]n (IN = isonicotinato) nanosheets and propose that synergetic stacking modes of nanosheets have a significant influence on gas separation performance. The stacking of the 2D MOF nanosheets is controlled by solvent droplet dynamic behaviors at different temperatures of drop coating. Our 2D MOF nanosheet membranes exhibit high gas separation performances for H2/CH4 (selectivity > 290 with H2 permeance > 520 GPU) and H2/CO2 (selectivity > 190 with H2 permeance > 590 GPU) surpassing the Robeson upper bounds, paving a potential way for eco‐friendly H2 separation.

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“…To find a formulation suitable for practical field applications, we combined all the parameters for analysis. The goal was to find the lowest concentration of the pesticide that produced a high number of pinning sites and prevented droplets from bouncing 40 on the surface of cucumber leaves with powdery mildew.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Optimization Strategy to Inhibit Droplets Rebound on Pathogen-Modified Hydrophobic Surfaces

He

¹

,

Ding

²

,

Li

³

et al. 2021

ACS Appl. Mater. Interfaces

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The deposition and retention of pesticide sprays on the surface of hydrophobic plant leaves is a major agricultural challenge, and the deposition of hydrophobic surfaces caused by plant leaf diseases is also a major agricultural problem. Many recent studies have focused on evaluating the effect of adding surfactants to water rather than to pesticide solutions to increase the deposition and retention of spray liquids. Here, we report a strategy to solve the problem of deposition and retention by studying the impact of the behavior of pesticide droplets with added surfactants and performing kinetic analysis on cucumber leaves with powdery mildew. The reduction in the bounce and splash of the pesticide droplets was analyzed by combining the pinning site formed in the retraction stage and the viscous dissipation in the rebound stage. In the practical application of the pesticide spray, we can clearly see that the bounce, splash, and powdery mildew spore ejection decreased when surfactants were added to the pesticide spray that was used on the cucumber leaves, and the adhesion and retention increased. The proposed comprehensive method is helpful for understanding the interactions between pesticide spray droplets and the surface of cucumber leaves with powdery mildew.

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Spreading and bouncing of liquid alkane droplets upon impacting on a heated surface

Cited by 18 publications

References 28 publications

Tuning the Stacking Modes of Ultrathin Two‐Dimensional Metal–Organic Framework Nanosheet Membranes for Highly Efficient Hydrogen Separation

Tuning the Stacking Modes of Ultrathin Two‐Dimensional Metal–Organic Framework Nanosheet Membranes for Highly Efficient Hydrogen Separation

Tuning the Stacking Modes of Ultrathin Two‐Dimensional Metal–Organic Framework Nanosheet Membranes for Highly Efficient Hydrogen Separation

Optimization Strategy to Inhibit Droplets Rebound on Pathogen-Modified Hydrophobic Surfaces

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