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TEM images of a variety of noble metal aerogels. The aerogels in (a–d) were prepared via strategy (I); those in (e) and (f) were obtained via strategy (II). The images in (c) and (d) are reproduced from ref (21). Copyright 2014 American Chemical Society. The images in (e) and (f) are reproduced with permission from refs (18) and (19). Copyright 2012 and 2013 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.
