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FTIR spectra of the silica nanoparticles. (a) The range of FTIR spectra (3850-2450 cm−1) showing the isolated and interacting hydroxyl and carbon impurity absorption bands of the nanoparticles. (b) The range of FTIR spectra (1400-700 cm−1) showing the silanol and siloxane absorption bands of the nanoparticles.
