Abstract
The organic-inorganic hybrid ureasil-based composites, containing polyether chains covalently linked to a silica framework through urea bridges, referred as ureasilicates or ureasils, and semiconducting As2S3 clusters, are investigated using Doppler broadening of annihilation line technique. It is established that the Doppler S and W parameters show significant structural difference between the pure ureasil and the As2S3-ureasil composites, the effect is more essential as the loading fraction of As2S3 increases. The new Doppler broadening results obtained in this work are found to be in consistent with the earlier reported results of positron annihilation lifetime measurements of the same materials.
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Acknowledgments
T.S. Kavetskyy is grateful to the SAIA for scholarships in the IPSAS. O. Šauša wishes to thank the Slovak Grant Agency VEGA (Nos. 2/0099/10 and 2/0164/14). T. Petkova and V. Boev were supported by the project BG051PO001/07/3.3-02/58/17.06.2008. This work was also partly supported by the SFFR of Ukraine (Nos. F40.2/019 and F52.2/003) and the MESU (No. 0114U002616). A.L. Stepanov thanks for the financial support by the RSF (No. 14-13-00758) in Russia.
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Kavetskyy, T.S. et al. (2015). Doppler Broadening of the Annihilation Line Study of Organic-Inorganic Hybrid Ureasil-Based Composites. In: Petkov, P., Tsiulyanu, D., Kulisch, W., Popov, C. (eds) Nanoscience Advances in CBRN Agents Detection, Information and Energy Security. NATO Science for Peace and Security Series A: Chemistry and Biology. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-9697-2_9
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