AL-MCM-41 Additive-free synthesis CONDENSATION Direct-continuous preparation GLYCOL Hematite Iron oxide MOLECULAR-SIEVES NANOMATERIALS Nanoparticles Nanostructured materials Nanostructured silica Non-scaffold template POROUS SILICA QD Chemistry Rice starch STABILITY SULFATE Sol-gel synthesis Spherical structures Surfactant-free Templating method ZEOLITES direct-continuous preparation nanostructured silica non-scaffold template sol-gel synthesis surfactant-free