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Monitoring the LbL deposition process of NSHGMS. (a) The nanostructured coating on NSHGMS was formed by stepwise adsorption of polymers and SiO2 NPs, as indicated by the change of resonant frequency of a QCM sensor. (b) Mass on the surface of NSHGMS during each deposition step, calculated from (a). (c) Zeta-potential of NSHGMS after each LbL deposition step. Layer 0 represents the surface covered by bare SiO2 NPs. Size of the SiO2 NPs was 200 nm.
