چكيده به لاتين
This thesis is about interaction of laser with PES film for medical applications and it does the previous reaserches. This experiment done for achivement effective and paractical reformes of PES. The advantages of laser irradiation is controlled radiation in a special zone that it is a usefull for usage of this technigue in medical and industry. In first section effect of KrF laser irradiation on the morphology, chemistry and hydrophilicity of the asymmetric and symmetric polyethersulfone polymer membrane at the presence/absence of the chemical PVP at the laser fluence below the ablation threshold is investigated. The results show that by changing the number of laser pulses, the membrane structure (symmetric/asymmetric) as well as chemical additives such as PVP, well defined holes and nanostructures are formed on the surface. These changes affect the membrane hydrophilicity, which could be optimized for different applications such as microfiltration of various particles, culturing of biological cells, and Blood compatibility. In second section of this project due to the low absorption of polymers in optical range of spectrum and the application of them on manufacturing Microfluidics chips and becomes of their transparency, a method is proposed to increase the absorption of polyether sulfone membrane for improving the quality of laser micromachining. The samples were put on organic fruit juices and were irradiated by Nd:YAG laser. The improvement of quality of micromachining on sample were investigated. In the following Is mentioned to the process in the thesis Chapter 1: The reason of selection this project, the method of this project and aim of thesis. Chapter 2: A brief investigation on basic experimental for example polymer and kind of polymer membranes, PES polymer and laser ablation Threshold. Chapter 3: Investigation of interaction of KrF laser with PES membranes under different number of pulses, repetition rate and interaction of Nd:YAG laser with PES in absorbent environment. Chapter 4: Studying results for reform the surface whit SEM, spectroscopy and measurement of contact angle. Chapter 5: sum up results and suggestion.
