5. Conclusion

The immense technological potential of nanosciences and nanotechnologies means that nanomaterials can no longer be considered as a homogeneous group for which conventional handling and protection techniques can be applied.

Each nanomaterial, with its specific technical characteristics, must be considered as an individual entity, with its own physico-chemical, toxicological and environmental behavior, for which appropriate means of control and protection must be found and implemented.

Nanotechnologies and nanomaterials represent a major technological leap forward, impacting all sectors of human activity, and their applications and dissemination raise questions about their impact on mankind and the environment.

Our knowledge of their physico-chemical, toxicological and ecotoxicological properties is still fragmentary...