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Characterization of PPNPS (polyvinylpyrrolidone nanoparticles): (a) Images of PPNPS with different loading ratios; (b) Particle size distribution (the concentration of PPNPS was 10 mg/mL in solution); (c) FTIR spectra (the samples were solid); (d) DSC (differential scanning calorimetry) thermograms (the samples were solid) and (e) X-ray diffraction patterns (the samples were solid).
