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From top to bottom: Raman spectra of hydrosols of freshly-synthesized σ-pPCDA@NSs (purple line) (a), aged σ-pPCDA@NSs (blue line) (b), aged H-pPCDA@NSs (brown line) (c) and pPCDA (black line) (d). The purple spectrum was acquired a year after the polymerized sample was prepared. Laser excitation = 632 nm, power beam 1 ÷ 10%.
