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FTIR spectra of the studied films. (a): (1) sodium alginate (ALG) and (2) ALG-ceria nanoparticles (CeONPs); (b): fragment of spectra 1a on enlarged scale, ALG (1) and ALG(CeONP) (2); (c): citrate-stabilized CeO2 (1) and difference spectrum obtained by subtracting the spectrum of ALG from that of the ALG(CeONP) composite (2).
