Abstract
A simple and practical method for the direct surface carboxymethylation of wrinkled mesoporous silica nanoparticles (WMS-COOH) was developed. The surface carboxymethyl functional groups were easily obtained by reacting the silanol (Si–O–H) groups at the surface of mesoporous silica with chloroacetic acid (ClCH2–COOH) which can be further modified by chemical functionalization. The WMS-COOH nanoparticles were characterized by Fourier transform infrared spectroscopy (FTIR), dynamic light scattering (DLS), scanning electron microscopy (SEM), and thermal gravimetric analysis (TGA). The main objective of this paper is to report this chemical modification method that can be easily adapted to any silica material; the carboxyl groups at the surface of the nanoparticles can therefore be used to prepare a wide range of derivatives or to keep the silica nanoparticles stably dispersed in aqueous solution at different pH ranges, as well as tuning the surface charge of the silica nanoparticles. As a proof of method, the preparation of curcumin-labeled WMS nanoparticles is reported, as an example of the versatility of these carboxymethylated silica nanoparticles.
Highlights
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A direct surface carboxymethylation of wrinkled mesoporous silica (WMS) nanoparticles is reported.
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This chemical modification method can be easily adapted to carboxymethylate any silica surface.
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Curcumin-modified WMS nanoparticles were prepared to show the versatility of this method.
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Acknowledgements
The authors are thankful to Luis A. García de la Rosa and María Fernanda Veloz for their help and contribution on preliminary work. Also, special thanks to the editor of this special issue and the reviewers for their insightful comments and suggestions to the paper.
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The paper was written through the contributions of all authors. All authors approved the final version of the paper.
Funding
This work was partially supported by CONACYT (Grants FON.INST./219/2017, CB-2010/154602, CONACYT-BMBF 2013/208132, and INFR-2014/02-23053). Partial support from the Office of Graduate Studies and Research (UDLAP) is acknowledged. JAFG is thankful to CONACYT for a Ph.D. scholarship.
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Flood-Garibay, J.A., Méndez-Rojas, M.A. A simple method for the synthesis of carboxymethylated wrinkled mesoporous silica nanoparticles and preparation of a WMS-curcumin conjugate. J Sol-Gel Sci Technol 102, 288–295 (2022). https://doi.org/10.1007/s10971-022-05747-7
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DOI: https://doi.org/10.1007/s10971-022-05747-7