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Artículo

Click-based thiol-ene photografting of COOH groups to SiO2 nanoparticles: Strategies comparison

Penelas, María JazmínIcon ; Soler Illia, Galo Juan de Avila ArturoIcon ; Levi, ValeriaIcon ; Bordoni, Andrea VeronicaIcon ; Wolosiuk, AlejandroIcon
Fecha de publicación: 02/2019
Editorial: Elsevier Science
Revista: Colloids and Surfaces A: Physicochemical and Engineering Aspects
ISSN: 0927-7757
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Físico-Química, Ciencia de los Polímeros, Electroquímica

Resumen

We present the study of the anchoring of carboxylic groups on SiO2 nanoparticles from different approximations based on the photochemical radical thiol-ene addition (PRTEA) reaction: a photografting approach between mercaptosuccinic acid (MSA) and vinyl-modified SiO2 nanoparticles and the post-grafting on the surface of silica colloids of the silane precursor 2-((2-(trimethoxysilyl)ethyl)thio)succinic acid (TMSMSA), obtained from the PRTEA. These synthetic strategies were compared with a widely common derivatization methodology based on the nucleophilic attack of surface-anchored amino groups with succinic anhydride. The successful functionalization of the colloidal silica was confirmed by infrared spectroscopy (FTIR), zeta potential at different pH and contact angle measurements. We found that although these three approaches were valid for −COOH immobilization, they had a noticeable impact on the dispersability and agglomeration of the colloidal suspension at the end of the synthesis. Scanning electron microscopy, dynamic light scattering (DLS) and fluorescence correlation spectroscopy (FCS) measurements indicated that the PRTEA photografting between MSA and vinyl-modified SiO2 resulted in highly dispersed colloidal particles. On the other hand, the presence of surface −COOH groups was highly beneficial for redispersion of the colloidal material after lyophilization or freeze-drying procedures.
Palabras clave: CARBOXYLIC GROUPS , CLICK-REACTIONS , COLLOIDS , SILICA , THIOL-ENE ADDITION
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/98193
URL: https://www.sciencedirect.com/science/article/pii/S0927775718317102
DOI: http://dx.doi.org/10.1016/j.colsurfa.2018.11.023
Colecciones
Articulos(SEDE CENTRAL)
Articulos de SEDE CENTRAL
Citación
Penelas, María Jazmín; Soler Illia, Galo Juan de Avila Arturo; Levi, Valeria; Bordoni, Andrea Veronica; Wolosiuk, Alejandro; Click-based thiol-ene photografting of COOH groups to SiO2 nanoparticles: Strategies comparison; Elsevier Science; Colloids and Surfaces A: Physicochemical and Engineering Aspects; 562; 2-2019; 61-70
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