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. 2014 Apr 15;4:4605. doi: 10.1038/srep04605

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SEM image of (a) partially separated SiO₂ NTs showing NT bundles and dispersed NTs, (b) fully separated dispersed SiO₂ NTs, (c) separated SiO₂ NTs showing tubular morphology, and (d) image showing branched morphology. Scale bars are 25 μm, 10 μm, 2 μm, and 1 μm for (a), (b), (c), and (d), respectively. (e) TEM image of dispersed SiO₂ NTs and inset showing tube diameter and wall thickness. Scale bar is 400 nm and 50 nm for the inset. (f) XRD analysis of SiO₂ NTs.