Morphological and Structural Properties of Amino-Functionalized Fumed Nanosilica and Its Comparison with Nanoparticles Obtained by Modified Stöber Method.

María C Ruiz-Cañas,Eduardo Manrique,Henderson I Quintero,Laura M Corredor,Arnold R Romero Bohórquez

doi:10.3390/molecules25122868

María C Ruiz-Cañas, Eduardo Manrique + Show 3 more

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https://doi.org/10.3390/molecules25122868

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Abstract

In industry, silica nanoparticles (NPs) are obtained by the fuming and the precipitation method. Fumed silica NPs are commonly used in the preparation of nanocomposites because they have an extremely low bulk density (160–190 kg/m3), large surface area (50–600 m2/g), and nonporous surface, which promotes strong physical contact between the NPs and the organic phase. Fumed silica has fewer silanol groups (Si–OH) on its surface than the silica prepared by the Stöber method. However, the number of –OH groups on the fumed silica surface can be increased by pretreating them with sodium hydroxide (NaOH) before further surface modification. In this study, the effectiveness of the NaOH pretreatment was evaluated on commercial fumed silica NPs with a surface area of 200 m2/g. The number of surface –OH groups was estimated by potentiometric titration. The pretreated fumed NPs, and the precipitated NPs (prepared by the Stöber method) were modified with 3-aminopropyltriethoxysilane (APTES) to obtain A200S and nSiO2-APTES, respectively. The NPs were characterized using electron dispersive scanning (EDS), scanning electron microscopy (SEM), dynamic light scattering (DLS), Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), X-ray diffraction (XRD), BET (Brunauer–Emmett–Teller) analysis, and ζ-potential. XRD confirmed the presence of the organo-functional group on the surface of both NPs. After the amino-functionalization, the ζ-potential values of the nSiO2 and A200 changed from −35.5 mV and −14.4 mV to +26.2 mV and +11.76 mV, respectively. Consequently, we have successfully synthesized functionalized NPs with interesting, specific surface area and porosity (pore volume and size), which can be attractive materials for chemical and energy industries.

Highlights

Research in nanotechnology over the past few years has resulted in different potential application areas for nanoparticles (NPs) [1,2,3,4,5,6]
NPs prepared by the Stöber method were evaluated
NPs were characterized through silica NPs prepared by the Stöber method were evaluated

Summary

Introduction

Research in nanotechnology over the past few years has resulted in different potential application areas for nanoparticles (NPs) [1,2,3,4,5,6]. The functionalization of NPs consists of the incorporation of reactive groups on the NPs surface [9,10,11,12,13], which become active sites to bind different molecules (i.e., polymers, composite materials, and elastomers) [14,15,16,17,18,19]. NPs surface [9,10,11,12,13], which become active sites to bind different molecules Different organic and inorganic compounds have been used to modify the surface of metal oxide materials, and elastomers) [14,15,16,17,18,19].

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