Abstract
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 ZrO2 nanoparticles, 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 ZrO2 nanoparticles in composites resulting in increased Tb3+ luminescence.
Highlights
In recent years, due to new requirements for quality of materials, great interest has been generated in organic-inorganic composites which are promising materials in various fields including optoelectronics, medicine, cosmetology, textile industry etc. [1,2,3]
Luminescence of hybrid polymer-inorganic G. xylinus accomplish producing cellulose (GXC)-based nanocomposites is provided by the presence of Tb3+ in the form of TbCl3 and [Tb(polyLig)](III)
Micro- and mesostructure, including fractal one, of the polymeric matrix prepared from air-dry, predisintegrated GXC, and of composites on its base with the addition of ZrO2 NPs and Tb3+ in the form of TbCl3 and in [Tb(polyLig)](III) was investigated by SEM techniques, ultra-small-angle neutron scattering (USANS), SANS, and small-angle X-ray scattering (SAXS), as well as by low-temperature nitrogen adsorption
Summary
Due to new requirements for quality of materials, great interest has been generated in organic-inorganic composites which are promising materials in various fields including optoelectronics, medicine, cosmetology, textile industry etc. [1,2,3]. Due to new requirements for quality of materials, great interest has been generated in organic-inorganic composites which are promising materials in various fields including optoelectronics, medicine, cosmetology, textile industry etc. Cellulose-based composites possess natural biodegradability and biocompatibility; they consist of cellulose nanocrystals (CNs), which warrants attention because of CNs’ unsurpassed physical and chemical properties [4]. Cellulose is one of the most widespread natural polymers on Earth. It is known that cellulose can be obtained from various evolutionary sources; it can be synthesized by plants, some animals (e.g., members of the subphylum Tunicata), or bacteria (e.g., Gluconacetobacter xylinus). It should be noted that biosynthesis of cellulose performed by various organisms yields products with varying morphological structures which differ significantly in supramolecular organization [5]. Cellulose biosynthesis by G. xylinus is environmentally friendly
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