Table 1

Characteristics of silica nanoparticle suspensions (0.5 mg/ml) in HEPES buffer (25 mM, pH 7.2)
Sample Hydrodynamic Size (nm) Zeta potential (mv) Fluorescence intensity atλ= 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

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.

Karaman et al.

Karaman et al. Nanoscale Research Letters 2012 7:358   doi:10.1186/1556-276X-7-358

Open Data