Morphological structure of Gluconacetobacter xylinus cellulose and cellulose-based organic-inorganic composite materials

3rd International Conference on Small Angle Neutron Scattering dedicated to the 80 anniversary of Yu.M. Ostanevich

Yu Smyslov, R.^1,2 ; Ezdakova, K.V.^2 ; Kopitsa, G.P.^2,3 ; Khripunov, A.K.^1 ; Bugrov, A.N.^1,4 ; Tkachenko, A.A.^5 ; Angelov, B.^6 ; Pipich, V.^7 ; Szekely, N.K.^7 ; Baranchikov, A.E.^8 ; Latysheva, E.^9 ; Chetverikov, Yu.O.^2 ; Haramus, V.^10

Institute of Macromolecular Compounds RAS, St Petersburg

199004, Russia^1

B P Konstantinov Petersburg Nuclear Physics Institute, National Research Center, Kurchatov Institute, Gatchina, Russia^2

I v Grebenshchikov Institute of Silicate Chemistry RAS, St Petersburg, Russia^3

Saint Petersburg Electrotechnical University LETI, St Petersburg

197376, Russia^4

Department of Microbiology, S Petersburg State University, St Petersburg

199178, Russia^5

Institute of Physics ASCR, ELI Beamlines, Prague

18000, Czech Republic^6

JCNS, Forschungszentrum Juelich GmbH, Outstation at MLZ, Garching

85747, Germany^7

N S Kurnakov Institute of General and Inorganic Chemistry RAS, Moscow, Russia^8

RC of SPbSU Centre for Diagnosis of Functional Materials in Medicine, Pharmacology and Nanoelectronics, S Petersburg

198504, Russia

(10) Helmholtz- Zentrum Geesthacht Outstation at EMBL/DESY, Notkestrasse 85, Hamburg, Germany^9

关键词: Gluconacetobacter xylinus;    Low-molecular weight salt;    Low-temperature nitrogen;    Metal-polymer complexes;    Morphological structures;    Organic-inorganic composite;    Structural characteristics;    Ultra-small-angle neutron scattering;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/848/1/012017/pdf
DOI  :  10.1088/1742-6596/848/1/012017

来源: IOP

【 摘 要 】

Scanning electron microscopy, ultra-small-angle neutron scattering (USANS), small-angle neutron and X-ray scattering (SANS and SAXS), as well as low-temperature nitrogen adsorption, were used in the studies of micro- and mesostructure of polymer matrix prepared from air-dry preliminarily disintegrated cellulose nano-gel film (synthesized by Gluconacetobacter xylinus) and the composites based on this bacterial cellulose. The composites included ZrO2nanoparticles, Tb3+in the form of low molecular weight salt and of metal-polymer complex with poly(vinylpyrrolydone)-poly(methacryloyl-o-aminobenzoic acid) copolymer. The combined analysis of the data obtained allowed revealing three levels of fractal organization in mesostructure of G. xylinus cellulose and its composites. It was shown that both the composition and an aggregation state of dopants have a significant impact on the structural characteristics of the organic-inorganic composites. The composites containing Tb3+ions demonstrate efficient luminescence; its intensity is an order of magnitude higher in the case of the composites with the metal-polymer complex. It was found that there is the optimal content of ZrO2nanoparticles in composites resulting in increased Tb3+luminescence.