Droplet evaporation characteristics on transparent heaters with different wettabilities

Lee, Suhan; Kim, Dong Ik; Kim, Young-You; Park, Sung-Eun; Choi, Gyu Seok; Kim, Yoonkap; Kim, Han-Jung

doi:10.1039/c7ra08888d

Cited by 18 publications

(8 citation statements)

References 24 publications

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“…The detail experimental methods are described in the Supporting Information (S1. Experimental) as the previously reported our papers. ,,, …”

Section: Methodssupporting

confidence: 64%

“…This is because the average evaporation flux of the droplet on the hydrophobic transparent heater surface is lower compared to that of the hydrophilic heater surface under the same conditions. 34,35 The average evaporation flux (J avg ) can be calculated using the equation below 36 i k j j j y…”

Section: Resultsmentioning

confidence: 99%

“…As shown in the figure, it was confirmed that the droplet evaporation time on the hydrophobic transparent heater surface was noticeably delayed. This is because the average evaporation flux of the droplet on the hydrophobic transparent heater surface is lower compared to that of the hydrophilic heater surface under the same conditions. , The average evaporation flux ( J avg ) can be calculated using the equation below where ρ, A , V , and d V /d t are the density, surface area, volume, and rate of mass loss of the droplet, respectively. The droplet evaporation time of the droplet on the hydrophilic surface is less than that of the droplet on the hydrophobic surface due to the greater surface area of the droplet with the hydrophobic surface and is shown in Figure S8.…”

Section: Resultsmentioning

confidence: 99%

“…Experimental) as the previously reported our papers. 5,16,34,36 ■ ASSOCIATED CONTENT * sı Supporting Information…”

Section: Methodsmentioning

confidence: 99%

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A Fluoropolymer-Coated Nanometer-Thick Cu Mesh Film for a Robust and Hydrophobic Transparent Heater

Kim

2020

ACS Appl. Nano Mater.

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To develop more effective optoelectronic devices with a transparent heater, it is necessary to investigate the droplet evaporation characteristics and wettability control on the heater surface. An optically transparent and hydrophobic amorphous fluoropolymer, Cytop, is spin-coated onto a nano-thick copper (Cu) micromesh-based transparent conductor to evaluate its performance for a high-durable transparent heater (a transmittance of 81.6% at 550 nm, a sheet resistance of 5 Ω sq −1 ). As the result, the thermal and chemical stabilities of the pure Cu micromesh-based transparent heater with the ∼80 nm thick Cytop layer improve without performance degradation. The evaporation time of water droplets on the surface of the hydrophobic transparent heater is noticeably delayed (about 60−130%) because the average evaporation flux of the droplet on the surface of the hydrophobic transparent heater is lower than those on the hydrophilic heater surfaces. In addition, unlike when the heater surface is hydrophilic, there is no coffee-ring effect when the heater surface is hydrophobic due to the recirculating Marangoni flow within the droplet. Further, the hydrophobic transparent heater surface exhibits excellent icephobic and antifrost properties. The results will be helpful for the further development of practical transparent heaters including self-cleaning smart windows, transparent actuators, transparent chemical and biological sensors, and transparent heating sources.

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“…The detail experimental methods are described in the Supporting Information (S1. Experimental) as the previously reported our papers. ,,, …”

Section: Methodssupporting

confidence: 64%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

“…Experimental) as the previously reported our papers. 5,16,34,36 ■ ASSOCIATED CONTENT * sı Supporting Information…”

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

A Fluoropolymer-Coated Nanometer-Thick Cu Mesh Film for a Robust and Hydrophobic Transparent Heater

Kim

2020

ACS Appl. Nano Mater.

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“…For example, biphilic patterns consisting of hydrophilic and hydrophobic spots are known to affect droplet evaporation , and the boiling characteristics of water . Wettability can affect the crystalline patterns resulting from the evaporation of saline droplets, the efficacy of transparent heaters for deicing surfaces, solar water desalination, a quartz crystal microbalance’s response to droplet evaporation, and the self-assembly of particles in nanofabrication . Likewise, droplets evaporating on chemically patterned surfaces could become unstable and break up due to different surface wettabilities .…”

Section: Introductionmentioning

confidence: 99%

A Dynamically Responsive Surface with Switchable Wettability for Efficient Evaporation and Self-Cleaning Abilities

Parisi

López

Narayanan

2022

ACS Appl. Eng. Mater.

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Evaporation is crucial in many applications. One of the critical parameters affecting evaporation is surface wettability, which is often tailored using coatings and micro- or nanoscale features on the surface. While this approach has advanced many technologies, the ability to control wettability dynamically can add new functionalities and capabilities that were not possible before. This study demonstrates how a self-cleaning superhydrophobic surface with an equilibrium contact angle of 155° can dynamically change to a superhydrophilic surface with a contact angle near 0°, resulting in drastically different evaporation characteristics. Specifically, we find that the evaporation rate and surface temperature reduction due to the resulting cooling are 3 times higher due to the change in surface wettability. This change in wetting behavior is due to the use of an amino-silane [N-(2-aminoethyl)-11-aminoundecyltrimethoxysilane]-functionalized surface, which is altered in the presence of dilute acetic acid. Upon complete evaporation, the surface reverts to superhydrophobic behavior. This reversible behavior is not seen in traditional nonwetting coatings like perfluorodecyltrichlorosilane and lauric acid. This strategy for dynamic control of wettability and evaporation can lead to advancements in many applications ranging from self-assembly-based fabrication processes to oil–water separation and advanced thermal management technologies.

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Evolution of Marangoni Thermo-Hydrodynamics Within Evaporating Sessile Droplets

Paul,

Dhar

2024

Lecture Notes in Mechanical Engineering

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Droplet evaporation characteristics on transparent heaters with different wettabilities

Abstract: Evaporation characteristics of a droplet on the surface of a transparent heater depend on the surface wettability.

Cited by 18 publications

References 24 publications

A Fluoropolymer-Coated Nanometer-Thick Cu Mesh Film for a Robust and Hydrophobic Transparent Heater

A Fluoropolymer-Coated Nanometer-Thick Cu Mesh Film for a Robust and Hydrophobic Transparent Heater

A Dynamically Responsive Surface with Switchable Wettability for Efficient Evaporation and Self-Cleaning Abilities

Evolution of Marangoni Thermo-Hydrodynamics Within Evaporating Sessile Droplets

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