A study was conducted to demonstrate the synthesis of monodisperse mesoporous silica nanoparticle (MSN) suspensions and investigate the effect of nanoparticle size on cell uptake. The MSNs were synthesized by adjusting the pH of the reaction medium, leading to a series of MSNs with uniform size ranging from 30-280 nm. The physical properties of the MSNs were characterized with various methods, such as nitrogen adsorption-desorption, transmission electron microscopy (TEM), and X-ray powder diffraction (XRD). The particle size effect on the cell uptake efficiency with human cervical cancer cells and cellular uptake of MSNs of various sizes were investigated by confocal laser scanning microscopy (CLSM). The uptake efficiencies were determined by inductively coupled plasma mass spectrometry (ICP-MS) analysis of total silicon content.
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