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Table 1 Characteristics of silica nanoparticle suspensions (0.5 mg/ml) in HEPES buffer (25 mM, pH 7.2)

From: Shape engineering vs organic modification of inorganic nanoparticles as a tool for enhancing cellular internalization

Sample

Hydrodynamic Size (nm)

Zeta potential (mv)

Fluorescence intensity at λ  = 520 nm

S-MSP1

687

−18

567

S-MSP2

875

≈0

392

NR-MSP

470

−16

626

S-MSP1-PEI ads.

692

22

216

S-MSP2-PEI graf.

569

33

203

NR-MSP-PEI ads.

298

15

266

NR-MSP-PEI graf.

388

23

227

NR-MSP-PEI-ACA

452

−12

170

NR-MSP-PEI-SUCC

389

−29

511

  1. NR-MSP, rod-like mesoporous silica particles; NR-MSP-PEI-ACA, acetic anhydride-modified NR-MSP-PEI graf.; NR-MSP-PEI ads., 25 k poly(ethylene imine)-adsorbed NR-MSP; NR-MSP-PEI graf., poly(ethylene imine) surface-grown NR-MSP; NR-MSP-PEI-SUCC, succinic anhydride-modified NR-MSP-PEI graf.; S-MSP1, negatively charged spherical mesoporos silica nanoparticles; S-MSP2, neutrally charged spherical mesoporos silica nanoparticles; S-MSP1-PEI ads., 25 k poly(ethylene imine)-adsorbed S-MSP1; S-MSP2-PEI graf., poly(ethylene imine) surface-grown S-MSP2.

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