摘要
采用喷涂工艺,用改性处理的纳米二氧化钛和聚二甲基硅氧烷在紫铜板表面制备出一种涂料与基底牢固黏结的超疏水表面,在不同冷面温度和环境湿度条件下,对表面进行了防冰抑霜性能测试。结果表明,与紫铜板表面相比,制备出的超疏水表面接触角高达165°,可以有效抑制表面凝结液滴的冻结,并且凝结液滴在超疏水表面上会发生自跳跃现象,有效减少表面霜晶的覆盖率。在冷面温度-7℃和湿度50%的条件下,表面凝结液滴几乎不会发生冻结,随着冷面温度的降低和环境湿度的增大,当冷面温度-15℃和湿度70%时,与紫铜板表面相比,超疏水表面仍然可将凝结液滴冻结的时间延迟10倍。通过对表面的霜层高度进行测量,超疏水表面霜高仅为紫铜板表面霜高的0.7—0.8倍。
A super hydrophobic surface with a coating firmly bonded to the substrate was prepared on the surface of a purple copper plate by spraying method with modified nano-titanium dioxide and polydimethylsiloxane.The anti-icing and anti-frosting properties of the surface were tested under different cold surface temperatures and ambient humidity.The results show that the prepared super hydrophobic surface with an apparent contact angle of 165°can effectively suppress the freezing of the surface condensation droplets compared with the purple copper plate.The self-jumping phenomenon of the condensation droplets can occur on the super hydrophobic surface,effectively reducing the coverage of surface frost crystals.When the cold surface temperature is set to be-7℃and the relative humidity is 50%,the surface condensate droplets hardly freeze.With the decrease of the cold surface temperature and the increase of the ambient humidity,when the cold surface temperature is set to be-15℃and relative humidity is 70%,the freezing duration of the condensate droplets on the super hydrophobic surface is 10 times longer than that on the purple copper plate.By measuring the frost thickness of the surface,the superhydrophobic surface frost thickness is only 0.7-0.8 times that of the purple copper plate surface.
作者
韩佳
勾昱君
秦仪
Han Jia;Gou Yujun;Qin Yi(North China University of Science and Technology,Tangshan 063210,China)
出处
《低温工程》
CAS
CSCD
北大核心
2022年第6期48-55,共8页
Cryogenics
关键词
超疏水表面
防冰
抑霜
霜高
自跳跃
super hydrophobic surface
anti-icing
anti-frosting
frost thickness
self-jumping
作者简介
韩佳,女,25岁,硕士研究生;通信作者:勾昱君,女,44岁,博士、硕士研究生导师、副教授。
