title: Structural study of polymer hydrogel contact lenses by means of positron annihilation lifetime spectroscopy and UV-vis-NIR methods.
abstract: A study has been conducted in order to determine presence of free volume gaps in the structure of structure of polymer hydrogel contact lenses made in phosphoryl choline technology and of the degree of defect of its structure. The study was made by means of positron annihilation lifetime spectroscopy. As a result of the conducted measurements, curves were obtained, which described numbers of counts of the acts of annihilation in the time function. The conducted studies revealed existence of three components τ(1), τ(2) and τ(3). The τ(3) component is attributed to the pick-off annihilation of o-Ps orthopositronium trapping by free volume gaps and provides information about geometrical parameters of the volumes. At the same time, the UV-vis-NIR spectrometry examination was conducted on the same samples in the spectral range 200-1,000 nm.
authors.affiliation: Institute of Physics, Jan Dlugosz University, Al. Armii Krajowej 13/15, 42-200, Czestochowa, Poland.
authors.forename: J
authors.initials: J
authors.lastname: Filipecki
authors.forename: A
authors.initials: A
authors.lastname: Kocela
authors.forename: P
authors.initials: P
authors.lastname: Korzekwa
authors.forename: R
authors.initials: R
authors.lastname: Miedzinski
authors.forename: K
authors.initials: K
authors.lastname: Filipecka
authors.forename: E
authors.initials: E
authors.lastname: Golis
authors.forename: W
authors.initials: W
authors.lastname: Korzekwa
mesh_terms: D003261:Contact Lenses; D004583:Electrons; D004866:Equipment Contamination; D006801:Humans; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate / Q000737:chemistry*; D008422:Materials Testing; D011108:Polymers / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet / Q000379:methods; D019265:Spectroscopy, Near-Infrared / Q000379:methods
chemical_list: D011108:Polymers; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate