Fig. 1From: Intracellular pH-responsive and rituximab-conjugated mesoporous silica nanoparticles for targeted drug delivery to lymphoma B cellsRepresentative characterizations of MSN and MSN-COOH. SEM images of MSN-COOH, scale bar: 500Â nm (a), TEM images of MSN-COOH, scale bar: 50Â nm (b), the FT-IR spectra of MSN and MSN-COOH (c), and the zeta potential of MSN-COOH (d)Back to article page