Formation of laser-induced surface micro/nanostructures and chemical modification on the surface of polyethersulfone (PES) film and composite membrane were studied. Laser irradiation was carried out by ultraviolet (248 nm) laser pulses at a fluence below the ablation threshold. The motivation was to investigate the effect of the structure (film and asymmetric/symmetric membrane), as well as addition of polyvinylpyrrolidone, on morphological and chemical changes after laser irradiation. Nano grains were formed on the surface of the membrane, where the difference in density was observed due to the different membrane structures and composition; while nano ripples were formed on the surface of the PES film. To monitor the modification of chemical properties of the surface after irradiation, attenuated total reflectance Fourier transform spectroscopy as well as contact angle measurement were performed. Finally, the physicochemical modifications caused by irradiation were discussed.

中文翻译：

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氪华丽激光照射后聚醚砜膜和薄膜的化学和形态改性

研究了激光诱导表面微纳结构的形成以及聚醚砜（PES）薄膜和复合膜表面的化学改性。激光照射是通过紫外（248 nm）激光脉冲以低于烧蚀阈值的通量进行的。目的是研究结构（薄膜和非对称/对称膜）以及聚乙烯吡咯烷酮的添加对激光照射后形态和化学变化的影响。膜表面形成纳米颗粒，由于膜结构和成分的不同，观察到纳米颗粒的密度差异；同时PES薄膜表面形成纳米波纹。监测辐照后表面化学性质的变化，进行了衰减全反射傅里叶变换光谱以及接触角测量。最后，讨论了辐照引起的物理化学变化。