摘要
采用热丝化学气相沉积法(CVD)制备单颗粒层纳米金刚石薄膜,研究颗粒分布状态对薄膜疏水性与黏性的影响规律。结果表明:对于疏水性而言,当颗粒间距大于1500 nm时,颗粒间距对疏水性起主导作用,颗粒间距越小,疏水性越好;当颗粒间距小于1500 nm时,颗粒尺寸对疏水性起主导作用,颗粒越大,疏水性越好;颗粒几乎连续后,三维结构变成二维平面,接触角又下降。对于黏性而言,当颗粒间距大于1480 nm时,颗粒间距减小使液滴与薄膜表面接触状态由Wenzel状态转变为Cassie状态,黏性变差;当颗粒间距小于1480 nm时,薄膜成分对黏性起主导作用,其上石墨相越多,黏性越好。由此得到颗粒分布状态对单颗粒层纳米金刚石薄膜疏水性与黏性的作用规律,为制备高疏水高黏性纳米金刚石薄膜奠定基础。这种无有机长链修饰的、具有良好导电性/电化学特性的、基于碳材料的高黏高疏水表面,可提供大量的气固液三相界面和液下空气袋,为液下耗气型催化/电催化反应或电场驱动下的微液滴无损转移提供基础材料。
Single-particle-layered nanodiamond film was prepared via hot filament chemical vapor deposition(CVD)method.Effects of particle distribution on hydrophobicity and viscosity of the film were studied.The results showed that the interparticle distance played a dominant role in influencing the hydrophobicity when it was larger than 1500 nm and the smaller the interparticle distance,the better the hydrophobicity.On the contrary,when the interparticle distance was less than 1500 nm,the hydrophobicity was mainly affected by the particle size and the larger the particle size,the better the hydrophobicity.However,when the particles became almost continuous,the three-dimensional structure turned into two-dimensional plane,leading to decrease of the contact angle.For the viscosity,when the interparticle distance was larger than 1480 nm,the contact state between the droplets and the nanodiamond film surface changed from the Wenzel state to the Cassie state with reduced viscosity as the distance decreased.When the particle spacing was less than 1480 nm,the composition of the nanodiamond film played the leading role in the viscosity,which improved along with increasing graphite phase content of the film.The above discoveries can lay a foundation for the preparation of single-particle-layered nanodiamond film with high hydrophobicity and viscosity.Such carbon-based surface,which has high hydrophobicity,high viscosity,excellent conductivity,good electrochemical properties and none organic long-chains,can provide abundant gas-solid-liquid three-phase interfaces and submerged air bags,making it efficient in gas consumption type catalytic/electrocatalytic reactions or non-destructive transfer of micro droplets under electric field.
作者
蒋梅燕
韩斯佳
陈成克
李晓
胡晓君
JIANG Meiyan;HAN Sijia;CHEN Chengke;LI Xiao;HU Xiaojun(College of Materials Science and Engineering,Zhejiang University of Technology,Hangzhou 310014,China)
出处
《浙江工业大学学报》
CAS
北大核心
2021年第1期99-105,共7页
Journal of Zhejiang University of Technology
基金
国家重点研发计划中欧国际合作项目(2016YFE0133200)
国家自然科学基金重点项目(U1809210)
浙江省重点研发计划国际科技合作“一带一路”专项(2018C04021)
浙江省自然科学基金资助项目(LQ15A040004,LY18E020013)。
关键词
单颗粒层纳米金刚石薄膜
颗粒分布状态
疏水性
黏性
single-particle-layered nanodiamond film
particle distribution state
hydrophobicity
viscosity
