Investigation of the dew condensation and subsequent spontaneous jumping of droplets on the highly hydrophobic surface under cooling

研究冷却条件下高度疏水表面上的露水凝结和随后的液滴自发跳跃

• 批准号: 24655117
• 负责人: NAKAJIMA Akira
• 金额: $ 2.66万
• 依托单位: Tokyo Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Challenging Exploratory Research
• 财政年份: 2012
• 资助国家: 日本
• 起止时间: 2012-04-01 至 2014-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-24655117/
• 关键词: 撥水; 結露; 凝結; 濡れ; 跳躍; 超撥水; 水滴; 電界; ベーマイト

Superhydrophobic coatings with nano-scale random roughness structure were prepared using boehmite and hydrophobic silanes. The samples were cooled by Peltier cooling element, and spontaneous jumping of water droplets formed on the coatings by dew condensation was observed from two different directions using high-speed camera systems. Spontaneous jumping of water droplets occurred subsequent to coalescence of more than two water droplets, deformation, and shape recovery. Small jumping droplets exhibited great initial jumping velocity. Initial jumping velocity decreased with increasing the difference in droplet sizes before coalescence. Actual jumping velocity was smaller than the theoretical value. When the sample was declined at 30 degrees, jumping frequency of water droplets repeated the increasing-decreasing cycle against cooling time and sustained droplet removal property. The jumping height of water droplets was remarkably increased under an external electric field.

以勃姆石和疏水硅烷为原料，制备了具有纳米级随机粗糙结构的超疏水涂层。采用Peltier冷却元件对试样进行冷却，并利用高速摄像系统从两个不同方向观察到由结露在涂层上形成的水滴的自发跳跃。水滴的自发跳跃发生在两个以上水滴的合并、变形和形状恢复之后。小的跳跃液滴具有较大的初始跳跃速度。初始跳跃速度随聚并前液滴尺寸差的增大而减小。实际跳跃速度小于理论值。当样品在30度下降时，水滴跳跃频率随冷却时间重复增加-减少的循环，并保持水滴去除性能。外加电场使水滴的跳跃高度明显增加。

项目成果

微小液滴を用いた固体表面の濡れ性の評価

使用微滴评估固体表面的润湿性

• 发表时间: 2013
• 作者: 中島章;古田勤;磯部敏宏;松下祥子
• 通讯作者: 松下祥子

高度撥水表面上での冷却過程における水滴の自発跳躍

高疏水性表面冷却过程中水滴的自发跳跃

• 发表时间: 2014
• 作者: 柳澤光亮;酒井宗寿;磯部敏宏;松下祥子;中島章
• 通讯作者: 中島章

Spontaneous Jumping of Water Droplet during Due Condensation on the Superhydrophobic Coatings

超疏水涂层上水滴凝结过程中的自发跳跃

• 发表时间: 2013
• 作者: K. Yanagisawa;M. Sakai;T. Isobe;S. Matsushita;A. Nakajima
• 通讯作者: A. Nakajima

規則的な親水部位を持つ平滑撥水性シランコーティングの静的/動的撥水性

具有规则亲水位点的光滑拒水硅烷涂层的静态/动态拒水性

• 发表时间: 2013
• 作者: 中川洋亮;酒井宗寿;磯部敏宏;松下祥子;中島章
• 通讯作者: 中島章