Kotynia Katarzyna, Kocela Agnieszka, Filipecki Jacek, Filipecka Katarzyna, Korzekwa Piotr, Golis Edmund
Institute of Physics, Jan Dlugosz University, al. Armii Krajowej 13/15, 42-200 Czestochowa, Poland.
Polim Med. 2013 Jan-Mar;43(1):21-8.
PURPOSE OF JOB: Currently, there isa need to increase comfort and visual acuity man. Simultaneously improving biocompatibility and minimizing the impact of the material on the physiology of the cornea is the primary driving force behind the evolution of materials used in the manufacture of contact lenses. Despite progressive development of modern materials science, there is still the problem of reducing the level of oxygen available to the cornea resulting in pathological changes in the cornea. Therefore, structural studies increases interesting in relating to the amorphous contact lenses polymeric materials.
The aim of this work is structural investigation of polymer hydrogel and silicone hydrogel contact lenses made in the technology of PC (Phosphoryl Choline). The study method was used positron lifetime spectroscopy PALS.
As a result of the measurements obtained curve describing the dependence of the number of counts of acts of annihilation as a function of time.
The study of PALS showed the existence of three components. Component tau1 is responsible for the annihilation of free positrons and the annihilation of electrons vacancy-type point defects. Component tau2 is associated with defects in the volume of grain boundaries formed, dislocations or clusters of vacancies. The results of calculations of mean values positron lifetime samples, showed longtime component tau3 in the spectrum of positron lifetime. Component tau3 is assigned to pick-off annihilation of ortho-positronium o-Ps trapping by free volume and providing information on the geometric parameters of the volume.
工作目的：目前，有必要提高人类的舒适度和视敏度。同时，提高生物相容性并使材料对角膜生理的影响最小化，是隐形眼镜制造中所用材料发展的主要驱动力。尽管现代材料科学不断进步，但仍存在角膜可利用的氧气水平降低从而导致角膜发生病理变化的问题。因此，关于非晶态隐形眼镜聚合物材料的结构研究变得越发有趣。
本工作的目的是对采用磷酰胆碱技术制造的聚合物水凝胶和硅水凝胶隐形眼镜进行结构研究。研究方法采用正电子寿命谱学（PALS）。
通过测量得到了描述湮灭事件计数数量随时间变化的曲线。
PALS研究表明存在三个成分。成分tau1负责自由正电子的湮灭以及电子空位型点缺陷的湮灭。成分tau2与形成的晶界、位错或空位团簇体积中的缺陷相关。正电子寿命样本平均值的计算结果表明，在正电子寿命谱中存在长时间成分tau3。成分tau3被归因于正电子素o-Ps被自由体积捕获的拾取湮灭，并提供有关体积几何参数的信息。
