Organized thiol functional groups in mesoporous core shell colloids

• Published in: Journal of solid state chemistry Vol. 187; pp. 97 - 102
• Main Authors: Marchena, Martín H., Granada, Mara, Bordoni, Andrea V., Joselevich, María, Troiani, Horacio, Williams, Federico J., Wolosiuk, Alejandro
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier Inc 01.03.2012; Elsevier
• Subjects: Adsorbents; BROMIDES; Chemistry; Colloid chemistry; COLLOIDS; Core–shell; Cross-disciplinary physics: materials science; rheology; DEPOSITION; Double layer; Exact sciences and technology; General and physical chemistry; INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; LAYERS; Materials science; Mesoporous silica; NANOSTRUCTURES; PARTICLES; Physics; POROUS MATERIALS; Porous materials; granular materials; SHELLS; SILICA; Silicon dioxide; SILICON OXIDES; Specific materials; Surface physical chemistry; SYNTHESIS; Templated materials; THIOLS; X-RAY PHOTOELECTRON SPECTROSCOPY; Templated materials; Core–shell; Thiols; Mesoporous silica; Colloids; Thiol; Multilayer; Core shell structure; Multiple layer; Template reaction; Organic silane; Inorganic adsorbent; Condensation; Porous material; Core-shell; Colloid; Mesoporosity; Chemical modification; Lamellar structure; Silicon oxides; Chemical properties; Anchoring; Double layers; Bilayers; X-ray photoelectron spectra
• ISSN: 0022-4596; 1095-726X
• DOI: 10.1016/j.jssc.2011.12.028

The co-condensation in situ of tetraethoxysilane (TEOS) and mercaptopropyltrimethoxysilane (MPTMS) using cetyltrimethylammonium bromide (CTAB) as a template results in the synthesis of multilayered mesoporous structured SiO2 colloids with “onion-like” chemical environments. Thiol groups were anchored to an inner selected SiO2 porous layer in a bilayered core shell particle producing different chemical regions inside the colloidal layered structure. X-Ray Photoelectron Spectroscopy (XPS) shows a preferential anchoring of the –SH groups in the double layer shell system, while porosimetry and simple chemical modifications confirm that pores are accessible. We can envision the synthesis of interesting colloidal objects with defined chemical environments with highly controlled properties. Mesoporous core shell SiO2 colloids with organized thiol groups. [Display omitted] ► Double shell mesoporous silica colloids templated with CTAB. ► Sequential deposition of mesoporous SiO2 layers with different chemistries. ► XPS shows the selective functionalization of mesoporous layers with thiol groups.