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. 2017 Feb 20;15:15. doi: 10.1186/s12951-017-0248-7

Fig. 1.

Fig. 1

SEM images of a the initial sample of a pure amphibole asbestos; b the pure amphibole asbestos sample after thermal treatment; c the initial sample of a commercial asbestos-cement for external roofs pipes; d the asbestos-cement sample after thermal treatment.

(Adapted from [20], with the permission of Elsevier)