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分别以载玻片、陶瓷片、镀铝聚酯膜、普通白纸和Cu片为基底,聚四氟乙烯(PTFE)粉末为原料,采用电子束蒸发法沉积聚合物薄膜。对于基底载玻片和陶瓷片,采用2%H2SO4溶液刻蚀预处理后在其上沉积厚度为125nm的聚合物薄膜;Cu片用不同浓度草酸刻蚀预处理后在其上沉积厚度为62 nm的聚合物薄膜;而基底镀铝聚酯膜和白纸,直接在其上沉积不同厚度的PTFE薄膜。通过傅里叶变换红外光谱仪(FT-IR)、原子力显微镜(AFM)、接触角测量仪分别对薄膜的成分、表面形貌和疏水性进行表征。结果表明:经刻蚀处理后,基底表面粗糙度皆增大。载玻片由亲水性转变为疏水性,陶瓷片无明显变化,Cu片显示良好的疏水性;沉积薄膜后,载玻片表面接触角增大到138°,而陶瓷片接触角可以达到142°;在粗糙度较大的白纸表面沉积不同厚度的PTFE薄膜,膜厚对接触角具有显著影响,当膜厚为225 nm时,接触角达到151°,滞后角为8°;经0.5%草酸刻蚀的Cu片表面膜的接触角达到153°,滚动角为2°,具有良好的超疏水性。
The glass films, ceramic sheets, aluminized polyester films, plain white sheets and Cu sheets were used as the substrate and polytetrafluoroethylene (PTFE) powders as the raw materials respectively. The polymer films were deposited by electron beam evaporation. For the substrate slides and ceramic sheets, a polymer film with a thickness of 125 nm was deposited on the substrate glass slides by 2% H2SO4 solution pretreatment. The Cu films were pretreated with different concentrations of oxalic acid and then deposited on them at a thickness of 62 nm Of the polymer film; and the base of aluminum-coated polyester film and white paper directly on it deposited in different thicknesses of PTFE film. The composition, surface morphology and hydrophobicity of the films were characterized by Fourier transform infrared spectroscopy (FT-IR), atomic force microscopy (AFM) and contact angle measurement. The results show that the substrate surface roughness increases after etching. Slides from hydrophilic to hydrophobic, no significant changes in ceramic, Cu films showed good hydrophobicity; deposited film, the contact angle of the slide surface increased to 138 °, while the ceramic contact angle can reach 142 °. The thickness of PTFE film deposited on the surface of rough white paper with different thicknesses has a significant influence on the contact angle. When the film thickness is 225 nm, the contact angle reaches 151 ° and the lag angle is 8 °. After 0.5% oxalic acid The contact angle of the etched Cu sheet surface film reached 153 ° with a roll angle of 2 ° and had good superhydrophobicity.