Photoluminescent behavior of cellulose modified with alkali metal nitrite and nitrate particles
Închide
Articolul precedent
Articolul urmator
675 0
SM ISO690:2012
NEDILKO, S., SCHERBATSKII, V., REVO, Serghei, IVANENKO, K., OLISCHUK, A., NEDIELKO, M.. Photoluminescent behavior of cellulose modified with alkali metal nitrite and nitrate particles. In: Materials Science and Condensed Matter Physics, Ed. 7, 16-19 septembrie 2014, Chișinău. Chișinău, Republica Moldova: Institutul de Fizică Aplicată, 2014, Editia 7, p. 177.
EXPORT metadate:
Google Scholar
Crossref
CERIF

DataCite
Dublin Core
Materials Science and Condensed Matter Physics
Editia 7, 2014
Conferința "Materials Science and Condensed Matter Physics"
7, Chișinău, Moldova, 16-19 septembrie 2014

Photoluminescent behavior of cellulose modified with alkali metal nitrite and nitrate particles


Pag. 177-177

Nedilko S.1, Scherbatskii V.1, Revo Serghei1, Ivanenko K.1, Olischuk A.1, Nedielko M.2
 
1 Taras Shevchenko National University of Kyiv,
2 E.O.Paton Electric Welding Institute, National Academy of Sciences of Ukraine
 
Disponibil în IBN: 6 martie 2019


Rezumat

Cellulose is a material of a very wide use and at the same time it is a promising material suitable for future multifunctional applications. This material draws a great attention in the past decades due to its applications in biology, medicine, food manufacturing etc. This variety of possible applications is determined by porous, micro- and nano- structured morphology of cellulose matrix and by the specific nature of its interaction with other chemical compounds. Photoluminescence (PL) spectroscopy among various practical procedures is a powerful tool for investigation of the structure, dynamic and any other physical properties of solids, liquids and polymer systems. Mainly, lanthanide (europium) complexes are used as probes, labels and sensors for mentioned purposes. But some of their properties, such as toxicity, chemical perturbations and other occur as negative those limit usage of lanthanide luminescent systems. We have intention to emphasize the possible role of luminescent molecules and molecular anions which can provide a great possibility to investigate interaction in materials like to cellulose and to image them. This paper deals with small molecular NO2 - (nitrite) and NO3 - (nitrate) anions incorporated into cellulose matrix as a part of the alkali metal nitrite (MNOn, M = Na or K; n = 2, 3) compositions. Studies of luminescence spectra, luminescence kinetics and luminescence excitation spectra of starting cellulose samples and doped with luminescent micro- powdered nitrite MNO2 composites were curried on in wide region of excitation and registration wavelengths (200 - 1200 nm) and samples temperature. Taken results were compared with known literature data and with results of our own investigation of the same luminescent probes incorporated into solid matrixes possessing different own properties and structures. The PL spectra and PL excitation spectra were measured as a function of the exciting radiation wavelength (λex). The set of the micro-photos of the studied samples was made using optical microscope. All the samples are characterized with stable and intensive PL. The dependence of the spectra on λex is of similar character for all the cellulose‟s samples studied. Depending on λex, the PL spectra contain main bands with maximum positions near 360, 430,465, and 580 nm. Finally, morphology and PL properties for microcrystalline cellulose (MCC), microcrystalline nitrite and nitrate (MCN), MNOn (M = Na. K, Cs; n = 2, 3) and two-component materials composed of MCC and MCN have been studied and characterized. It was found that cellulose lattice affect on micro – crystalline nitrite and nitrate particles. This fact showed that the “cellulose+MNOn” composites are not a mechanical mixtures of their two components – cellulose and MNOn crystallites. An assumption was made that NO2 - anions may reveal in two states: both embedded directly in a cellulose host matrix and in the state of a mechanical admixture as a part of MNO2 micro- and nanoparticles. This study showed also a perceptiveness of nitrite compound luminescence usage for determining some peculiarities of cellulose structure and its physical properties. Further studies of “cellulose + MNOn (M = Na, K, Cs, n = 2, 3)” composite materials have to be performed in the future.