Organized multilayered mesoporous core-shell colloids with tailored chemical groups

ALEJANDRO WOLOSIUK; MARTIN H. MARCHENA; MARA GRANADA; HORACIO TROIANI; MARIA JOSELEVICH; FEDERICO J. WILLIAMS

Guaruja, SP - Brasil

Congreso; 7th Brazilian MRS Meeting; 2008

SBPMat

<!-- /* Style Definitions */ p.MsoNormal, li.MsoNormal, div.MsoNormal {mso-style-parent:""; margin:0cm; margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:12.0pt; font-family:"Times New Roman"; mso-fareast-font-family:"Times New Roman";} @page Section1 {size:612.0pt 792.0pt; margin:72.0pt 90.0pt 72.0pt 90.0pt; mso-header-margin:36.0pt; mso-footer-margin:36.0pt; mso-paper-source:0;} div.Section1 {page:Section1;} --> Colloidal core-shell structures have broad applications in optical devices, catalysis and smart reinforcers [1]. In this context, the synthesis of multilayer hierarchical colloidal structures stands out as chemical and physical responsive units. Briefly, silica core particles were obtained using Stöber’s method [2] while multiple layered mesoporous shell synthesis employed different alkoxide precursors (i.e. 3-mercaptopropyltrmethoxysilane (MPTMS), 3-aminopropyltriethoxysilane (APTES) and tetraethoxysilane (TEOS)) and cationic surfactants as soft templates for pore synthesis [3]. Controlling variable reactions such as precursor and seed silica cores concentration we were able to tailor the layer thickness and chemical composition of these mesoporous core shell colloids. These results were confirmed using FTIR, EDS, XPS and TEM