Coating barium titanate nanoparticles with polyethylenimine improves cellular uptake and allows for coupled imaging and gene delivery

- Barium titanate nanoparticles were complexed with linear polyethylenimine.
- BT-PEI complexes entered cells eight-fold better than BT alone.
- Second harmonic generation imaging was used to image BT-PEI complexes.
- BT-PEI can deliver DNA to cells efficiently.