Surface-charge measurements of mammalian cells in terms of Zeta potential are demonstrated as a useful biological characteristic in identifying cellular interactions with specific nanomaterials. A theoretical model of the changes in Zeta potential of cells after incubation with nanoparticles is established to predict the possible patterns of Zeta-potential change to reveal the binding and internalization effects. The experimental results show a distinct pattern of Zeta potential change that allows the discrimination of human normal breast epithelial cells (MCF-10A) from human cancer breast epithelial cells (MCF-7) when the cells are incubated with dextran coated iron oxide

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Two isostructural lanthanide-organic frameworks (1 and 2) with 2-fold interpenetrating nets have been synthesized based on 1,4-benzenedicarboxylic acid (H(2)BDC). By application of an organic ligand with hindrance groups and a terminal chelating ligand to replace BDC and coordinated solvates, interpenetration has been effectively controlled. The gas-sorption properties of the noninterpenetrating net have been studied.

Two isomorphous lanthanide−organic frameworks, Ln(BDC) 1.5 (DMF)-(H 2 O) (Ln = Er (1), Tm (2)) have been synthesized based on 1,4-benzenedicarboxylic acid (H 2 BDC). Because of the 2-fold interpenetration, the pores are partly blocked and there are no significant gas adsorptions for these two interpenetrating nets. Through control over interpenetration by applying an organic ligand with hindrance groups or replacing coordinated solvent molecules with a chelating ligand, three noninterpenetrating lanthanide−organic frameworks, Er 2 (BDC) 3 (phen 5), possessing the same topology with 1 and 2, have been synthesized and characterized. Further changing reaction conditions, three other porous lanthanide−organic frameworks with different structures with 1−5, 7), and Sm(TBDC) 1.5 (phen)-(H 2 O)•DMF•H 2 O (8), have been constructed. Gas sorption measurements for 5, 6, 7, and 8 have been carried out and revealed that these materials possess permanent porosity. The catalytic property for complex 6 has also been studied.