The fourth international conference on Nanoscience, Nanotechnology and Nanobiotechnology (4th 3NANO – former French-Brazilian meeting on Nanoscience Nanotechnology and Nanobiotechnology) was organized in Paris, December 2017 from 10 to 14th, in the prestigious Pierre & Marie Curie University (UPMC) Campus. The conference was chaired by Professor Régine Perzynski of CNRS. Several invited and contributed presentations were made on recent results from MAGENTA by CNRS, CEA, CNR and NCSRD.