Nitrogen adsorption-desorption isotherms of mesoporous silica prepared under quiescent interfacial growth method. (a) All samples and (b) samples MS7 and MS12 prepared using various molar ratios of nitric acid (NA) and sulfuric acid (SA), respectively. Some isotherms were shifted upwards for proper comparison.
Alsyouri et al. Nanoscale Research Letters 2013 8:484 doi:10.1186/1556-276X-8-484