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Full (left) and magnified (right) Attenuated Total Reflectance Infrared Spectroscopy (ATR-IR )spectra of BEO samples and prepared films with different BEO concentrations. (a) E-BEO; (b) M-BEO; (c) carboxymethyl cellulose (CMC) film (control); (d) 15E-BEO film; (e) 30M-BEO film.
