N-containing silica spherical particles: one-pot synthesis, particularities of structure, and extended applications Inna Melnyk 1,2 , Veronika Tomina 2 , Nataliya Stolyarchuk 2 , Iryna Furtat 3 , Halyna Yankovych 1 , Miroslava Vaclavikova 1 , Gulaim Seisenbaeva 4 , Vadim Kessler 4 1 Institute of Geotechnics SAS, Slovak Republic;
2 Chuiko Institute of Surface Chemistry of NASU, Ukraine; 3 National University of Kyiv-Mohyla Academy, Ukraine; 4 Swedish University of Agricultural Sciences, Sweden
The Stöber sol-gel technique has great potential for the controlled design of novel materials for various applications. Our research is focused on the one-pot synthesis and investigation of spherical silica particles carrying different amino functional groups (N-particles): 1) We varied the type of amino groups (≡Si(CH 2 ) 3 NH 2 , ≡Si(CH 2 ) 3 NH(CH 2 )2NH 2 , and ≡[Si(CH 2 )3NH] 2 ); 2) We targeted to improve mesoporosity of the materials using bis-silanes with phenylene or ethylene bridges as structuring reagents in the co-condensation; 3) We adjusted the reactivity of amino groups by applying their combinations with methyl or phenyl groups in the surface layer. The size and shape of the N-particles are affected by the synthesis temperature [1] , the steric factor (functional group size), the type of applied (methoxy or ethoxy) derivative, and, consequently, the hydrolysis rate, leading to the emergence of 800 nm spherical particles with 3-aminopropyl groups, and dendritic 15 nm silica particles with ethylenediamine and secondary amine groups forming 275 nm aggregates [2] . The substitution of structuring tetraethoxysilane with bis-silanes allowed creating porous samples with the improved specific surface at increased proportion of bis-silanes [3,4] . Meanwhile, the content of amino groups was dependent on the reacting silanes ratio [1] , generally increasing with a growing proportion of a functionalising silane in the reaction [3] . Additional hydrophobic hydrocarbon functions incorporated together with amino groups were shown to be a powerful tool in adjusting the particle size, functional groups arrangement and availability (preventing amino groups from back-bonding), and the surface hydrophobic-hydrophilic balance of such N-particles [1,5] . Additional hydrophobic sites on N-particles enhanced the adsorption of organic molecules, dyes [5,6] or bovine serum albumin [2] , and even Ni(II) ions [3] . Rhodamine 6G modified silica particles with NH 2 and C 6 H 5 groups were applied as luminescent sensor for the determination of carbamazepine in the concentration range 0.8-200.0 μM. During Eu 3+ adsorption, not the functional groups number, but their surface location and arrangement had a predominant role in the adsorption complex formation [3,7] , and Eu(III) complexes on different N-particles varied in emissions [7] . Antibacterial research with aqueous suspensions of pure and Cu 2+ -loaded materials revealed improved antibacterial activity which can be connected with several types of interaction between N-particles and bacterial cells or bacterial cell membrane oxidation via Fenton-like Cu 2+ /Cu + redox cycling [5,8] . The research has been supported by the APVV-19-0302 and DNr.2018-04841 (SRC grant) projects. References 1. Tomina, et al. Beilstein J Nanotechnol 8 (2017) 334–347, 10.3762/bjnano.8.36 2. Melnyk, et al. Crystals 13 (2023) 190, 10.3390/cryst13020190 3. Tomina, et al. Molecules 28 (2023) 430, 10.3390/molecules2801043 4. Tomina, Biocompatible Hybrid Oxide Nanoparticles for Human Health, Elsevier, 2019, https://doi.org/10.1016/C2017-0- 02516-8S. 5. Kotsyuda, et al. Appl Surf Sci 420 (2017) 782–791, 10.1016/j.apsusc.2017.05.150 6. Melnyk, et al. J Mol Liq 336 (2021) 116301, 10.1016/j.molliq.2021. 7. 116301V.Tomina, et al. Colloids Surf A 608 (2021) 125552, 10.1016/j.colsurfa.2020.12555229 8. Tomina, et al. ACS Omega 5 (25) (2020) 15290-15300, 10.1021/acsomega.0c01335
F24
© The Author(s), 2023
Made with FlippingBook Learn more on our blog