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Preparation and characterization of pD-Al2O3 nanoparticles. (A) Chemical structure of pD-Al2O3 nanoparticles. Transmission electron micrographs of (B) Al2O3 nanoparticles and (C) pD-Al2O3 nanoparticles. (D) Fourier-transform IR spectra of Al2O3 nanoparticles (blue trace), pD-Al2O3 nanoparticles (red trace) and polydopamine (pDA, green trace). Relevant peaks are marked and discussed in the text.
