Temat: vis - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Analysis of free volumes and light transmission in hydrogel and silicone-hydrogel polymer contact lenses
Autorzy:: Kocela, A.
Miedzinski, R.
Filipecka, K.
Filipecki, J.
Powiązania:: https://bibliotekanauki.pl/articles/173601.pdf
Data publikacji:: 2016
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: positron annihilation
UV-vis-NIR
polymers
contact lenses
free volume
Opis:: The free volume holes and light transmission of hydrogel and silicone-hydrogel polymer contact lenses were investigated. As the material, the Proclear family (omafilcon A) of hydrogel contact lenses and the Biofinity family (comfilcon A) of silicone-hydrogel contact lenses were used. Positron annihilation lifetime spectroscopy was used to characterize geometrical sizes and fractions of the free volume holes in the investigated samples. There was a clear difference in the size of free volume holes and the fractional free volume between silicone-hydrogel and hydrogel polymer contact lenses. These changes are shown by a thorough analysis of the long-lived component of lifetime of ortho-positronium. At the same time, UV-vis-NIR in the spectral range 200-1000 nm studies were performed on the same samples of contact lenses spectrometry.
Źródło:: Optica Applicata; 2016, 46, 1; 35-45
0078-5466
1899-7015
Pojawia się w:: Optica Applicata
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Modification influence on the structural parameters of polymer ophthalmic materials
Autorzy:: Chamerski, K.
Korzekwa, W.
Miedzinski, R.
Filipecki, J.
Powiązania:: https://bibliotekanauki.pl/articles/174664.pdf
Data publikacji:: 2016
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: intraocular lenses
IOLs
positron annihilation
UV-vis-NIR
polymers
biomaterials
Opis:: Studies on polymer materials used in ophthalmological surgery as intraocular implants are presented in this paper. The material under investigation were brand new lenses provided by Alcon. The first lens, model SA60AT, was the basis structure, whereas the other one, model SN60AT, was a structure with an added modification in the form of a blue light chromophore. Results obtained with the use of the positron annihilation lifetime spectroscopy, as well as UV-vis-NIR methods, showed that the structure modified by the chromophore becomes more packed, while the results obtained by means of the UV-vis-NIR methods showed that the modification restricts the blue light transmission.
Źródło:: Optica Applicata; 2016, 46, 1; 47-55
0078-5466
1899-7015
Pojawia się w:: Optica Applicata
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: Infrared studies and spectral properties of photochromic high silica glasses
Autorzy:: Girsova, M A
Golovina, G F
Drozdova, I.A.
Polyakova, I G
Antropova, T V
Powiązania:: https://bibliotekanauki.pl/articles/174765.pdf
Data publikacji:: 2014
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: silica porous glass
photochromic high silica glass
transmission electron microscopy TEM
X-ray diffraction (XRD)
UV–VIS–IR transmission spectra
Opis:: The structure of photochromic high silica glasses (PHSGs) was studied by UV–VIS–NIR and IR spectroscopy, transmission electron microscopy (TEM) and X-ray diffraction (XRD) techniques. PHSG plates were obtained by impregnation of silica porous glasses at first with AgNO3 aqueous solution (in or without the presence of the sensitizers, such as Cu(NO3)2 or Ce(NO3)3), next in the mixed halide salt (NH4Cl, KBr, KI) solution. Then a part of the samples was sintered at temperatures from 850 to 900 °C up to closing of the pores. The results of TEM study have shown that the PHSG plates have two-phase structure with inclusions of the size of 10–100 nm. According to XRD data, the PHSGs contain the AgBr phase. IR spectra confirmed the presence of AgI, AgCl, CeO2, CuCl2, CuCl phases in PHSGs.
Źródło:: Optica Applicata; 2014, 44, 2; 337-344
0078-5466
1899-7015
Pojawia się w:: Optica Applicata
Dostawca treści:: Biblioteka Nauki

Artykuł

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