Surface Modification of Magnetic Mesoporous Systems with Aminopropyl Groups and Their Properties
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Surface Modification of Magnetic Mesoporous Systems with Aminopropyl Groups and Their Properties Natalia B. Kondrashova1 · Artem Sh. Shamsutdinov1 · Viktor A. Valtsifer1 · Vladimir N. Strelnikov1 Received: 9 August 2020 / Accepted: 28 September 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Iron oxide silica FexOy-SiO2 composite systems with aminopropyl (AP) groups on the surface have been synthesized via different routes. The surface modified samples have been studied by X-ray diffraction (XRD) analysis and IR spectroscopy. Magnetic phases of iron oxides have been detected after post-synthetic grafting of AP groups onto the surface of these composite systems. Magnetic properties of these samples have been determined. Only insignificant reduction in the material saturation magnetization and remanent magnetization have been registered upon surface grafting procedure. This approach has been considered to be successful as magnetic properties of the substrate were preserved. Amount of aminoalkyl groups grafted onto the silica composite surface has been determined by thermogravimetric analysis. The mass fraction of grafted aminoalkyl groups has been found to be dependent on the textural properties of the composite sample. Keywords Mesoporous · Magnetic materials · Template · Hydrothermal synthesis · Postsynthetic grafting · Aminoalkyl groups
1 Introduction Recently, there has been growing interest in such application fields of high-dispersion inorganic systems as magnetic recording, catalysis and sorption, they are also successfully used for the solution of various biotechnological problems. It has been connected with the change of physical and chemical properties of the material with reducing particle size of the dispersed component, or the appearance of quantum-size effects. A special place in this research direction is occupied by the studies of high-dispersion systems with magnetic properties. Nowadays magnetic nanocomposites are actively used in various environmental processes, including wastewater treatment [1–6]. Metal oxide nanocomposites have been tested for different biomedical purposes, such as separation of cell mixtures, isolation of specific proteins and antibodies, biosensor and biochip design, contrast media in magnetic resonance imaging (MRI), drug delivery substrates [7–24]. * Artem Sh. Shamsutdinov [email protected] 1
Institute of Technical Chemistry, UB RAS, Acad. Korolev St. 3, Perm, Russian Federation 614013
The simplest method to immobilize drugs or other biomedical objects is their adsorption on the substrate surface. Various silica materials are commonly used as a substrate (adsorbent). The quantitative and qualitative characteristics of the adsorbed substance depend on the chemical nature of a substrate. The processes of silica modification are known to involve the silanol groups both at the external surface and in the bulk of the material; the siloxane groups can also participate in reactions. However, the surface silanol groups play a key role
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