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Influence of the Heat Treatment on the Band Gaps in the Biopolymer Photonic Crystals

100%
Savic-Sevic S., Pantelic D., Jelenkovic B.
Acta Physica Polonica A
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2009
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vol. 116
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issue 4
645-646
EN
1D photonic crystal was fabricated in a dichromate-sensitized biopolymer using holography method. The effects of the temperature of the photonic crystal layer on the center of photonic band gaps were studied. We showed that the central wavelength of the band gap can be tuned by heating the photonic crystal layer. By applying such heat treatment, tuning of the position of the band gap for about 80 nm was obtained.
2
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Holographic Measurement of Dental Tissue Contraction and Stress, due to Postpolymerization Reaction

100%
Pantelić D., Blažić L., Savić-Šević S., Murić B., Vasiljević D., Panić B., Belić I.
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EN
Polymerization contraction of dental photo-polymer composites induces internal stress, in a tooth cavity. This stress is measured indirectly by, first, holographic determination of tooth deformation, with consequent calculation of stress using finite element method. Real time holographic technique enabled observation of dental deformation in all stages of polymerization. Specially constructed blue-LED light source was used to polymerize photopolymer composite. We have found that polymerization continues even after illumination is over. Consequently, stress is increased, too.
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Alginate Biopolymer Coatings Obtained by Electrophoretic Deposition on Ti15Mo Alloy

88%
Szklarska M., Dercz G., Simka W., Dudek K., Starczewska O., Łężniak M., Łosiewicz B.
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vol. 125
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issue 4
919-923
EN
In this work, the electrophoretic deposition method has been developed for the fabrication of bioactive alginate coatings on the surface of Ti15Mo implant alloy. Thin ZnO film was deposited cataphoretically as the interlayer prior to anaphoretic deposition of alginate (Alg) which was performed from aqueous solution containing 1 g dm^{- 3} of NaAlg at room temperature. The deposition voltage and time varied in the range 20-50 V and 30-120 min, respectively. The microstructure of Alg coatings was studied by scanning electron microscope, and the surface roughness was analysed using atomic force microscopy. Structure was studied by grazing incidence X-ray diffraction. Chemical composition and functional group were examined using energy dispersive spectrometry and attenuated total reflectance Fourier transform infrared spectroscopy methods, respectively. It was found that controlling the deposition conditions it is possible to obtain amorphous Alg coatings of variable thickness and porosity. Mechanism of electrophoretic deposition of bioactive Alg coatings on the Ti15Mo alloy surface was discussed.
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