Regulation of the size of metal iron nanoparticles in channels of mesoporous silica matrices (MCM-41, SBA-15) and struct
- PDF / 1,265,207 Bytes
- 17 Pages / 547.087 x 737.008 pts Page_size
- 102 Downloads / 146 Views
RESEARCH PAPER
Regulation of the size of metal iron nanoparticles in channels of mesoporous silica matrices (MCM-41, SBA-15) and structure and magnetic properties of the received nanocomposites МСМ-41/Fe0 and SBA-15/Fe0 Elena G. Zemtsova & Andrei Yu. Arbenin & Laysan F. Galiullina & Alexandra N. Ponomareva & Daria N. Sokolova & Vladimir M. Smirnov Received: 10 February 2020 / Accepted: 16 July 2020 # Springer Nature B.V. 2020
Abstract In modern methods of synthesis of nanostructured materials based on mesoporous silica matrices (MCM-41, SBA-15), it is not possible to simultaneously fine adjust both the pore diameter and the thickness of the separating walls. This article presents the results of work on the creation of composites based on mesoporous silica matrices MCM-41 and SBA-15, reinforced with metallic Fe nanoparticles (Fe NPs). The article considers a new way of ultrafine regulation of the pore radius and separating wall thickness mesoporous silica SBA-15. In this work, we studied the changes in their structural and magnetic characteristics by directionally adjusting the geometric parameters of the porous structure of the initial matrices. The following methods are applied to adjust the silica pore parameters: hydrothermal treatment and templating using a micellar expander. The technique is based on building up aluminumoxygen nanolayers on the pore walls using gas-phase atomic layer deposition technique (ALD). Studying room-temperature magnetization of Fe NPs obtained during the synthesis in a matrix of mesoporous silica MCM-41 (pore size of 3–5 nm) allowed us to establish superparamagnetic properties of such magnetic materials, which allows to use them in medicine for targeted E. G. Zemtsova (*) : A. Y. Arbenin : L. F. Galiullina : A. N. Ponomareva : D. N. Sokolova : V. M. Smirnov Institute of Chemistry, St. Petersburg State University, St. Petersburg 198504, Russia e-mail: [email protected]
drug delivery. Fe NPs in the mesoporous silica SBA-15 matrix with a pore size of 3–6 nm also exhibit superparamagnetic properties, and these composites showed a coercive force increase with an increase in the original matrix pore size.
Keywords Mesoporous silica . Metallic Fe nanoparticles . Superparamagnetism . Targeted drug delivery
Introduction The keystone of modern chemical materials science is the experimental and theoretical investigation of the nanometer-scale structural organization of matter (Smirnov 2002; Tretyakov Yu 2004). It should be noted that it is difficult to reproducibly control nanomaterial size during the synthesis. One of the ways to create NPs with desired properties is synthesis of composites in so-called nanoreactors (Zhu et al. 2005; Huang et al. 2011; Barreca et al. 2007; Gaihre et al. 2009). Usually nanoreactor is a solid matrix with nanoscale pores. If matrix pores are ordered, therefore, the NPs array in these pores will also be ordered, which are especially important for practical applications. Fe NPs are widely used in medicine, e.g., as contrast agents in tomographic diagnostics,
Data Loading...
