X射线光电子能谱
接触角
原子力显微镜
表面粗糙度
氧气
光化学
材料科学
分析化学(期刊)
化学
表面改性
化学工程
纳米技术
有机化学
物理化学
复合材料
工程类
作者
Ibrahim Cisse,Sarah Oakes,Shreen Sachdev,Marc Toro,Shin Lutondo,Devon Shedden,Kristen Margaret Atkinson,Joel Shertok,Michael Mehan,Surendra K. Gupta,G. A. Takacs
出处
期刊:Technologies (Basel)
[Multidisciplinary Digital Publishing Institute]
日期:2021-05-11
卷期号:9 (2): 36-36
被引量:9
标识
DOI:10.3390/technologies9020036
摘要
Polyethersulfone (PES) films are widely employed in the construction of membranes where there is a desire to make the surface more hydrophilic. Therefore, UV photo-oxidation was studied in order to oxidize the surface of PES and increase hydrophilicity. UV photo-oxidation using low pressure mercury lamps emitting both 253.7 and 184.9 nm radiation were compared with only 253.7 nm photons. The modified surfaces were characterized using X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), and water contact angle (WCA) measurements. Both sets of lamps gave similar results, showing an increase of the oxygen concentration up to a saturation level of ca. 29 at.% and a decrease in the WCA, i.e., an increase in hydrophilicity, down to ca. 40°. XPS detected a decrease of sp2 C-C aromatic group bonding and an increase in the formation of C-O, C=O, O=C-O, O=C-OH, O-(C=O)-O, and sulphonate and sulphate moieties. Since little change in surface roughness was observed by AFM, the oxidation of the surface caused the increase in hydrophilicity.
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