Polydopamine-assisted attachment of β-cyclodextrin onto iron oxide/silica core-shell nanoparticles for magnetic dispersive solid phase extraction of aromatic molecules from environmental water samples

Synthesis of FeO@SiO2–DNA core–shell engineered nanostructures for rapid adsorption of heavy metals in aqueous solutions

“…57 A shoulder at 625 cm À1 indicated the formation of Fe-O-Si complexes through chemical binding between the FeO/ca-NPs and the SiO 2 shell. 26 In the case of FeO@SiO 2 -NH 2 , the broadband with low intensity between 3680 and 2916 cm À1 , 58 and the shoulder from 1335 to 1612 cm À1 , 59 were ascribed to the overlapping of the -OH bands by N-H bonds. The presence of amine groups on the surface was proved, suggesting a suitable surface for ds-DNA condensation.…”

“…45 This controlled reaction allowed to synthesize single, uniform, and well-dispersed FeO@SiO 2 , rather than a bulk of nanoparticles coated with a SiO 2 shell as reported in several studies. 26,27,45 The FeO@SiO 2 possess spherical and semi-spherical shapes with a wide distribution and average diameter size of 125 AE 27 nm (see ESI, Fig. S1b †).…”

“…The XRD pattern for FeO@SiO 2 shows a weak and broad peak between 20 and 28 , which was ascribed to the amorphous structure of the SiO 2 shell. 26 Additionally, strong and sharp peaks at 36 indicate the crystalline nature, which the average crystallite size was calculated using the Debye-Scherrer method based in eqn (8). 49…”

“…25 The presence of silanol (Si-OH) and siloxane (Si-O-Si) groups on the SiO 2 shell promote few agglomerates of FeO@SiO 2 due to the formation of hydrogen bonds. 26 However, these groups also provide a large number of active sites for further functionalization with other molecules, and even for an improved adsorption process. 27 Among those molecules, the presence of amine (-NH 2 ) groups increases the massive interaction between the FeO@SiO 2 with specic targets such as DNA chains, 28 heavy metal ions, 27 and organic pollutants.…”

A Study of the Optical Properties and Fabrication of Coatings Made of Three-Dimensional Photonic Glass

“…Silica is a stable material and widely used in sensors [12], optoelectronics [13], quantum devices [14], environmental science [15], and biomaterials [16]. Compared to organic polymer materials such as polystyrene, silica is an inorganic material, which can be applied in a wider range of applications.…”