Tuning of particle morphology and pore properties in mesoporous silicas with multiple organic functional groupsElectronic supplementary information (ESI) available: experimental details, SEM images, N2 adsorption isotherms, pore size distributions, TEM images, and details of solid state 13C and 29Si NMR experiments. See http://www.rsc.org/suppdata/cc/b3/b306255d/