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まぁ考えてみれば当たり前ですが，ナノシルバーと一言で言っても，って長い歴史があるんですね。恥ずかしながら，知りませんでした。

Nowack, B., H. F. Krug, et al. (2011). "120 Years of nanosilver history: Implications for policy makers." Environmental Science & Technology 45(4): 1177-1183.

ざっと眺めただけですが，

While there are naturally topics where there is ample opportunity to improve scientific understanding about nanosilver (e.g., with respect to its environmental behavior and effects), it would be a mistake for regulators to ignore the accumulated knowledge of our scientific and regulatory heritage in a mistaken bid to declare nanosilver materials as new chemicals, with unknown properties and automatically harmful simply on the basis of a change in nomenclature to the term “nano”.

あたりが，この論文の意図の1つかと思います。