XRD patterns of mesoporous silica products. (a) Samples MS7 and MS12 prepared at different molar ratios of nitric acid (NA) and sulfuric acid (SA) respectively and (b) all remaining samples. Sample MS12 at 3.34 SA is not shown because no product was grown throughout the growth period.
Alsyouri et al. Nanoscale Research Letters 2013 8:484 doi:10.1186/1556-276X-8-484