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Volume 6 Research & Reviews: Journal of Material Sciences
ISSN: 2321-6212 Ceramics 2018
May 14-15, 2018
May 14-15, 2018 | Rome, Italy
4th International Conference and Expo on
Ceramics and Composite Materials
Aerogels – functional materials with promising optical applications
Dimitar Shandurkov, Nina Danchova and Denis Paskalev, and Stoyan Gutzov
Sofia University St. Kliment Ohridski, Bulgaria
Sol-gel technology is an advanced physico-chemical method for production of oxide ceramics, glasses, thin film coatings or
aerogels. The starting chemicals /liquid precursors as tetraethoxysilane – TEOS/ allow homogenization at molecular level,
production of rare chemical compositions and modification of their surface properties [1 - 5].
Aerogels are advanced solid sol-gel materials with extremely low thermal conductivity down to 0.01 W/m K; low density
(bellow 0.1 g / cm3) and porosity at about 95%. There are two general strategies for preparation of aerogel particles depending
on drying conditions, supercritical and subcritical drying [1, 2]. In the Department of Physical Chemistry, University of Sofia,
a novel subcritical preparation scheme based on controlled drying at 0.2-0.5 atm and 40-70 oC was developed. The sol-gel
scheme allows preparation both of aerogel microgranules and nanopowders. Recently, we also developed a new technique for
incorporation of strongly red emitting complexes / Eu(III) phenanthroline nitrate / into silica aerogels leading to multicolour
emiting powders [1, 2]. The technique was also applied to incorporate [Tb(phen)2](NO3)3 and Eu(III) – DMF complexes into
aerogel powders. Physicochemical properties of the powders obtained are shown bellow, SBET and Dav are surface area and
mean pore diameter, respectively. Cabot Lumira™ aerogel granules (sample 5) are given for comparison.
Figure 1. Luminescence spectra of functionalized aerogel powders: 1- blue emitting silica doped with 1,10 – phenanthroline, SiO2:0.18phen; 2 – red emitting
composites, SiO2:0.007[Eu(phen)2](NO3)3
Recent Publications:
1. S. Gutzov, N. Danchova, S. I. Karakashev, M. Khristov, J. Ivanova, J. Ulbikas, Preparation and thermal properties of
chemically prepared nanoporous silica aerogels, J Sol-Gel Sci Technol 70 (2014) 511-516.
2. S. Gutzov, N. Danchova, R. Kirilova, V. Petrov, S. Yordanova, Preparation and luminescence of silica aerogel composites
containing an europium (III) phenanthroline nitrate complex, Journal of Luminescence 183 (2017) 108–112.
3. J.C.G. Bunzli, On the design of highly luminescent lanthanide complexes, Coordin Chem Rev 293 (2015) 19-47.
4. Preparation and spectral properties of europium hudrogensquarate microcrystals, T. Kolev, N. Danchova, D,
Shandurkov, S. Gutzov, submitted to Spectrochimica Acta A (2017)
5. N. Danchova, S. Gutzov, Functionalization of Sol-Gel Zirconia Composites with Europium Complexes, Z Naturforsch
B 69(2) (2014) 224-230.
Biography
Dimitar Shandurkov studies Physical and theoretical chemistry at the Faculty of Chemistry and Pharmacy, Sofia University “St. Kliment Ohridski”. He possess
experience in the sol-get chemistry, hybrid optical materials, obtained at the Department of Physical Chemistry. In addition, he has a strong background in
computational chemistry and applied mathematics.
Dimitar Shandurkov et al., Res. Rev. J Mat. Sci. 2018, Volume 6
DOI: 10.4172/2321-6212-C1-015