Cetyltrimethylammonium bromide Chemical environment Chemical modification Co-condensation Colloid chemistry Colloids Controlled properties Core shell particles Core-shell Coreshell Double layers Functional groups In-situ Layered Structures Mercaptopropyltrimethoxysilane Mesoporous Mesoporous Silica Mesoporous silica Multi-layered Porosimetry Porous layers SH groups Silicon compounds Templated materials Tetraethoxysilanes Thiol functional groups Thiol groups Thiols X ray photoelectron spectroscopy