2019
DOI: 10.1016/j.colsurfa.2018.11.023
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Click-based thiol-ene photografting of COOH groups to SiO2 nanoparticles: Strategies comparison

Abstract: 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 derivati… Show more

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Cited by 9 publications
(12 citation statements)
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“…Scheme presents a simplified description of the PNIPAm grafting on SiO 2 NPs. In the first step, SiO 2 NPs were surface functionalized by a “one-pot” reaction, with the addition of vinyltriethoxysilane (VTES) directly into the alcosol of the Stöber synthesis, resulting in vinyl modified NPs, SiO 2 -V NPs. , In the second step, the previously immobilized vinyl groups worked as coupling agents to introduce reactive groups onto the particle surface and the PNIPAm was then grafted-on using these groups. This synthesis methodology allowed us to obtain core-brush SiO 2 NPs covered with PNIPAm brushes of controlled thickness.…”
Section: Resultsmentioning
confidence: 99%
“…Scheme presents a simplified description of the PNIPAm grafting on SiO 2 NPs. In the first step, SiO 2 NPs were surface functionalized by a “one-pot” reaction, with the addition of vinyltriethoxysilane (VTES) directly into the alcosol of the Stöber synthesis, resulting in vinyl modified NPs, SiO 2 -V NPs. , In the second step, the previously immobilized vinyl groups worked as coupling agents to introduce reactive groups onto the particle surface and the PNIPAm was then grafted-on using these groups. This synthesis methodology allowed us to obtain core-brush SiO 2 NPs covered with PNIPAm brushes of controlled thickness.…”
Section: Resultsmentioning
confidence: 99%
“…In the first step, SiO2 NPs were surface functionalized by a "one-pot" reaction, adding an organic silane agent, vinyltriethoxysilane (VTES), directly into the alcosol of the Stöber synthesis, resulting in vinyl modified NPs, SiO2-V NPs. 57,58 In the second step, the previously immobilized vinyl groups worked as a copolymerizable site for the PNIPAm grafting. This synthesis methodology allowed obtaining core-brush SiO2 NPs covered with PNIPAm brushes of controlled thickness.…”
Section: Optimization Of Pnipam Photografting On Sio2 Nps Surfacementioning
confidence: 99%
“…A common strategy to add functional groups to SiO x -coated NPs is to first hydrolyze silane-based reagents to form terminal silanol groups (Si–OH) on these reagents, followed by their condensation with the silanol groups on the surfaces of the SiO x coating. An advantage of using silane-based reagents for such surface modifications is their ability to rapidly form covalent silyl ether (M–O–Si–R) bonds between the reagent and the surfaces (M = Si or a metal atom) of the NPs at relatively low temperatures. Silane-based reagents can, however, have several limitations that include extensive procedures required to control the reaction conditions, to control the moisture content, and to minimize side reactions (e.g., self-condensation to form siloxanes). Another disadvantage of using silanes as molecular reagents is the relatively limited number of functional groups available for a direct or one-step attachment to silanol groups on the SiO x -coated NPs. For example, relatively few studies use silane-based reagents to functionalize NPs with −COOH-terminated surfaces since multi-step processes are required to create these surface functional groups. …”
Section: Introductionmentioning
confidence: 99%