Temat: silicone - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Preliminary investigations on silicone resin composites with carbon filler for dry electrodes application
Autorzy:: Grochala, Dominik
Kajor, Marcin
Smoleń, Paweł
Stodolak-Zych, Ewa
Powiązania:: https://bibliotekanauki.pl/articles/286052.pdf
Data publikacji:: 2019
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:: dry electrodes
ECG pads
silicone resin
carbon filler
Opis:: The paper presents results of investigations of basic material properties of novel composites based on silicone resin and carbon nanotubes as a filler. The motivation for the research is a need for materials which provide better mechanical properties than standard wet Ag/AgCl electrodes. However, a critical issue is also obtaining defined electrical characteristics in order to preserve an ability to effectively record biomedical signals such as electrocardiography (ECG). Within the introduction chapter, related researches and the current state-of-the-art in the context of dry electrodes technology were described. In the next step technological aspects of components processing and forming as well as the morphology of substrates used in the research were presented. Thermally-cured silicone resin was utilized to obtain elastic properties of the resulting material. The carbon nanotubes (CNT) were chosen as a conductive medium which provides defined electrical impedance. A developed technological process allowed to deliver samples of reproducible structure and properties. In the next chapter, methods and results of conducted experiments involving electrical, mechanical and thermal examination were presented. Finally, achieved outcomes are promising in the context of improvements of the designed composite. Especially the conductivity below 100 Ohms constitutes a significant motivation for further research in the field of dry electrodes for biosignals acquisition.
Źródło:: Engineering of Biomaterials; 2019, 22, 149; 20-24
1429-7248
Pojawia się w:: Engineering of Biomaterials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Chemical stability assessment of soft magnetic composites for biomedical applications
Autorzy:: Powojska, Anna
Niewęgłowska, Joanna
Suska, Sylwia
Cavadas, Adelio
Mystkowska, Joanna
Powiązania:: https://bibliotekanauki.pl/articles/2058401.pdf
Data publikacji:: 2022
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:: silicone-based composite
magnetic material
physicochemical properties
incubation
ICP-MS analysis
Opis:: Silicone-based elastic composites with a metallic filler have been strongly developed in recent years. These materials are considered applicable in many fields of science, including medicine. The advantageous mechanical parameters provided by the NdFeB micropowder reinforcement are balanced by the elasticity and biocompatibility guaranteed by the silicone matrix. So far, there have been several reports regarding such composites’ properties important from the biomedical point of view. The article deals with the physicochemical parameters of the new material for medical applications as well as the properties of the incubation liquid. The aim of the work was to determine effects of both the magnetic particles content (0, 30, 50, 70 wt%) and the incubation process under physiological conditions on the physicochemical properties of the material and the solution after incubation. The samples were incubated for various periods of time (8, 16 and 24 weeks) at the temperature of 37°C in a 0.9 wt% NaCl solution. The density, water contact angle, and water absorption of the materials were measured. The electrolytic conductivity, pH value, redox potential, surface tension, and kinematic viscosity were determined for the liquids after the materials incubation. The results obtained for pure silicone and the silicone-based composite reinforced with NdFeB microparticles were compared. The results indicate that incubation affects the samples and liquids, changing their physiochemical properties. For composites, the density decreased, which results in a noticeable concentration of the examined elements in the solutions.
Źródło:: Engineering of Biomaterials; 2022, 25, 164; 2--8
1429-7248
Pojawia się w:: Engineering of Biomaterials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Influence of environmental factors on contact lenses properties
Autorzy:: Czerwińska, E.
Szaraniec, B.
Cholewa-Kowalska, K.
Powiązania:: https://bibliotekanauki.pl/articles/284498.pdf
Data publikacji:: 2018
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:: comfilcon A
silicone hydrogel contact lenses
simulated tear fluid (STF)
durability
environmental factors
Opis:: Nowadays contact lenses are a very common way of vision correction. To be used successfully, they must meet a number of conditions. This article describes studies on the influence of environmental factors such as low temperature (4°C), high temperature (60°C), various fluids (simulated tear fluid (STF), physiological saline, multi-purpose contact lens solution) and ultraviolet radiation on the properties (wettability, dehydration, UV-vis transmission, surface structure/ microstructure) of 3rd generation silicone hydrogel contact lenses. Contact angle measurement device, gravimetric method (measurement of dehydration), UV-vis spectrophotometry, ATR spectroscopy and SEM microscopy were used during the research. The results showed that environmental factors can influence some features of comfilcon A contact lenses. The reduction of contact lens water content, being the result of a long-term storage at high temperature, might cause changes in their elasticity, thereby sense of discomfort for the user, while storage in physiological saline causes slight decrease in visible light transmission. What is more, the temperature and fluids used for storage of silicone hydrogel contact lenses, as well as ultraviolet radiation affect the microstructure of analysed lenses.
Źródło:: Engineering of Biomaterials; 2018, 21, 144; 20-27
1429-7248
Pojawia się w:: Engineering of Biomaterials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Wpływ noszenia na strukturę wody i dehydratację silikonowo-hydrożelowych soczewek kontaktowych
The influence of wearing on water states and dehydration of silicone-hydrogel contact lenses
Autorzy:: Krysztofiak, K.
Płucisz, M.
Szyczewski, A.
Powiązania:: https://bibliotekanauki.pl/articles/285065.pdf
Data publikacji:: 2012
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:: soczewki kontaktowe
hydrożele silikonowe
dehydratacja
struktura wody
contact lenses
silicone-hydrogles
dehydration
water states
Opis:: Na zachowanie się miękkich soczewek kontaktowych na oku i ich komfort noszenia wpływa wiele czynników. Uwodnienie oraz struktura wody w polimerze decydują m.in. o ich właściwościach mechanicznych oraz transporcie przez soczewkę. Dehydratacja, która ma miejsce od momentu aplikacji soczewki na oko, może przyczyniać się do obniżenia komfortu i jakości widzenia pacjenta. Dodatkowo, podczas noszenia zarówno na powierzchni jak i wewnątrz materiału mogą odkładać się zanieczyszczenia pochodzące z filmu łzowego. Celem badania była analiza in vitro zmian w strukturze wody oraz dynamice dehydratacji pojawiających się na skutek użytkowania w silikonowo-hydrożelowych soczewkach kontaktowych wyprodukowanych z materiału senofilcon A i ich zmian w czasie. Jak wskazują otrzymane wyniki, podczas noszenia dochodzi do obniżenia uwodnienia soczewek kontaktowych, a zawartość wody wolnej i luźno związanej spada o około połowę. Analiza współczynnika dehydratacji DR wskazuje, iż wraz ze zwiększaniem czasu noszenia odparowanie wody z materiału zachodzi wolniej i w mniejszym stopniu, niż dla soczewek nowych.
The on-eye performance and wearing comfort of soft contact lenses may be influenced by many factors. Water content and its structure among the polymer decide e.g. on their mechanical and transport properties. Dehydration, which takes place immediately after lens application may lead to decrease in patient wearing comfort and quality of vision. Additionally, during wearing both on the surface and inside material the contaminants from the tear film can be accumulated. The purpose of this study was to examine the changes in water structure and dehydration patterns that may happen in silicone-hydrogel contact lenses made from senofilcon A as result of wearing. The results obtained have shown, that during wearing water content of these lenses decreases and the content of free and loosely bound water is reduced by about half. Dehydration factor DR analysis indicates that with increasing time of wearing water evaporates from the material more slowly and to a lesser extent than for the new ones.
Źródło:: Engineering of Biomaterials; 2012, 15, 115; 18-25
1429-7248
Pojawia się w:: Engineering of Biomaterials
Dostawca treści:: Biblioteka Nauki

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