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Table 1 Zeta-potentials.

From: Silica nanoparticles for the layer-by-layer assembly of fully electro-active cytochrome c multilayers

SiO2-nanoparticles Bare
SiO2 spheres
Modified SiO2-NH2 spheres Modified SiO2-CO2H spheres
Zeta-potential (mV) -41.44 +39.63 -54.71
  1. Zeta-potentials of the synthesized and modified SiNPs