Figure 1From: A combination of hard and soft templating for the fabrication of silica hollow microcoils with nanostructured walls SEM images (a, b) CMC-COOH before silica coating, (c) microcoil after silica-coating and calcination. The initial weight ratios for the silica coating process were CTAB/NH3(aq.)/CMC-COOH/TEOS = 13.9/70.4/0.6/15.1. The black arrows indicate silica particles adhered to the coils whereas white arrows indicate translucid coil sections.Back to article page