sounds interesting! wish u good luck.
you'd better have more discussion with biologists, especially with a developmental biology background or cell biology, to design a suitable but valuable model to study (cell type, influencing factor...)
Here is one about nanotopographic influences:
1. McMurray, R. J.; Gadegaard, N.; Tsimbouri, P. M.; Burgess, K. V.; McNamara, L. E.; Tare, R.; Murawski, K.; Kingham, E.; Oreffo, R. O. C.; Dalby, M. J., Nanoscale surfaces for the long-term maintenance of mesenchymal stem cell phenotype and multipotency. Nat Mater 2011, 10, (8), 637-644.