Gellan Gum-Montmorillonite Nanocomposites for Electrochromic Devices

The present paper shows the results of nanocomposite polymer electrolytes (SPEs) of montmorillonite (MMT; Na+SYN-1) and gellan gum obtained by the solution casting method. The membrane samples were characterized by ATR-FTIR, time-domain nuclear magnetic resonance (TD-NMR), and scanning electron micr...

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Published in:Coatings (Basel) 2023-02, Vol.13 (2), p.350
Main Authors: Caliman, Willian R., Sentanin, Franciani C., Sabadini, Rodrigo C., Garcia, Rodrigo H. S., Monaretto, Tatiana, Colnago, Luiz A., Pawlicka, Agnieszka
Format: Article
Language:English
Subjects:
Cellulose acetate
Charge density
Clay
Discoloration
Electrochromic cells
Electrochromism
Electrolytes
Environmental Sciences
Gellan gum
Glycerol
High density polyethylenes
Montmorillonite
Nanocomposites
NMR
Nuclear magnetic resonance
Polymers
Polysaccharides
Relaxation time
Scanning electron microscopy
Spin-lattice relaxation
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Summary:The present paper shows the results of nanocomposite polymer electrolytes (SPEs) of montmorillonite (MMT; Na+SYN-1) and gellan gum obtained by the solution casting method. The membrane samples were characterized by ATR-FTIR, time-domain nuclear magnetic resonance (TD-NMR), and scanning electron microscopy (SEM). Then, two samples were chosen and applied in small electrochromic devices (ECDs). The ATR-FTIR revealed shifts in bands of acetate and glycosidic bonds at 1032 and 1611 cm−1, respectively, indicating an interaction between the gellan gum and Na+SYN-1. The spin–lattice relaxation time of the proton nuclei (T1) suggests the poor dispersion of MMT in the matrix, especially above 20 wt.%. However, SEM pictures pointed to a more homogeneous surface of the nanocomposite containing 40 wt.% Na+SYN-1 when compared to the sample without clay. NPEs with 10 and 40 wt.% Na+SYN-1 were applied in ECDs, and the voltammograms showed a decrease in anodic and cathodic peaks after 2519 chronocoulometric cycles for the sample with 10 wt.% Na+SYN-1 and after 420 cycles for the sample with 40 wt.% Na+SYN-1. There was also a decrease in the charge density in both ECDs and an oscillating difference in transmittance between the colored/discolored states during the chronocoulometric cycles of the ECD with GG-MMT10. Further studies may reveal more property improvements in gellan gum nanocomposites.
ISSN:2079-6412
2079-6412
DOI:10.3390/coatings13020350