Synthesis, characterisation, and evaluation of core–shell Fe
 3
 O
 4
 /SiO
 2
 /polypyrrole composite nanoparticles

Li, Bei; Qiao, Yongsheng; An, Jinhui; Shen, Lazhen; Ma, Qi; Guo, Yong

doi:10.1049/mnl.2017.0907

Cited by 11 publications

(5 citation statements)

References 34 publications

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“…The XRD patterns of Fe 3 O 4 and Fe 3 O 4 -rGO are presented in Figure 2 a. It can be seen that both hollow Fe 3 O 4 nanoparticles and Fe 3 O 4 -rGO nanocomposites have five characteristic diffraction peaks at 2θ of 30.1°, 35.4°, 42.9°, 57.5° and 62.7°, corresponding to the (220), (311), (400), (422), (511) and (440) diffraction planes of magnetite, respectively [ 36 , 37 ], which indicates that the magnetite crystalline phase remained in hollow Fe 3 O 4 and Fe 3 O 4 -rGO nanocomposites. Moreover, the characteristic diffraction peaks are sharp, suggesting that the synthesized samples have a high degree of crystallinity.…”

Section: Resultsmentioning

confidence: 99%

“…The magnetic properties of samples were performed using the SQUID-VSM magnetic measurement system, and the magnetic hysteresis loops of Fe 3 O 4 and Fe 3 O 4 -rGO are depicted in Figure 2 b. As shown in Figure 2 b, almost zero coercivity and residual magnetism in samples proved the superparamagnetic properties of hollow Fe 3 O 4 nanoparticles and Fe 3 O 4 -rGO [ 37 , 41 ]. The bare Fe 3 O 4 nanoparticles exhibited a high saturation magnetization (Ms) of 66.7 emu/g.…”

Section: Resultsmentioning

confidence: 99%

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Facile Synthesis of Hollow Fe3O4-rGO Nanocomposites for the Electrochemical Detection of Acetaminophen

et al. 2023

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Acetaminophen (AC) is one of the most popular pharmacologically active substances used as an analgesic and antipyretic drug. Herein, a new type of hollow Fe3O4-rGO/GCE electrode was prepared for electrochemical detection of AC through a three-step approach involving a solvothermal method for the synthesis of hollow Fe3O4 and the chemical reduction of graphene oxide (GO) for reduced graphene oxide (rGO) and Fe3O4-rGO nanocomposites modified on the glassy carbon electrode (GCE) surface. The as-prepared Fe3O4-rGO nanocomposites were characterized using a transmission electron microscope (TEM), X-ray diffraction (XRD), and a magnetic measurement system (SQUID-VSM). The magnetic Fe3O4-rGO/GCE electrodes were employed for the electrochemical detection of AC using cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and square wave voltammetry (SWV) and exhibited an ultra-high selectivity and accuracy, a low detection limit of 0.11 µmol/L with a wider linear range from 5 × 10−7 to 10−4 mol/L, and high recovery between 100.52% and 101.43%. The obtained Fe3O4-rGO-modified GCE displays great practical significance for the detection of AC in drug analysis.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Facile Synthesis of Hollow Fe3O4-rGO Nanocomposites for the Electrochemical Detection of Acetaminophen

et al. 2023

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“…The coagulated particles (SiO 2 @MNP) were re-dispersed in water, and the particle suspensions were sonicated for 1. 5 ammonia solution, TEOS, MPTMS, and RBITC were then added to initiate the silica-coating reaction. The concentrations of water, ammonia, TEOS, MPTMS, and RBITC were 9 M, 300 mM, 25 mM, 25 mM, and 50 μM, respectively.…”

Section: ■ Introductionmentioning

confidence: 83%

“…Magnetic composite particles (MCPs) are composed of magnetic nanoparticles (MNPs) and scaffold materials. − Owing to their advantages, such as superparamagnetism, high biocompatibility, and photothermal conversion ability, MCPs are expected to be applicable for photothermal therapy (PTT). − In PTT, MCPs, which have high photothermal conversion efficiency, are introduced into target cancer cells, causing thermal damage to cellular components (biomacromolecules and organelles) via near-infrared (NIR) laser irradiation. Generally, the aggregation of MCPs enhances the magnetic response of particles.…”

Section: Introductionmentioning

confidence: 99%

Intracellular Magnetic Control over the Reversible Assembly of Silica-Based Magnetic Composite Particles for Photothermal Therapy

Kameda

Suzuki

Kato

et al. 2023

ACS Appl. Nano Mater.

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Many photothermal materials have been developed in recent years to achieve efficient photothermal therapy. Although larger-sized materials are preferred to ensure a better photothermal performance, upsizing hampers the cellular uptake of these materials. To overcome this dilemma, we proposed an active control system to manipulate the assembly of magnetic composite particles (MCPs) at the cellular level. Herein, MCPs of different sizes (small, medium, and large) were synthesized, and their surfaces were modified with a polymer. These MCPs were then cultured with HeLa cells, and their uptake and mobility were investigated. Small-sized MCPs (d v = 206 nm) and medium-sized MCPs (d v = 312 nm) could be introduced into HeLa cells. However, a smaller amount of the large-sized MCPs was introduced as compared to the other MCPs. Using a direct current magnetic field [DCMF (B = 150 mT)], medium-sized MCPs were observed to quickly assemble in cells; however, redispersal did not occur after the DCMF was turned off. To improve the particle dispersibility, polyethylene glycol and polyethyleneimine (PEI) were used to modify the medium-sized MCPs. Coating the MCPs with PEI (a polymer molecular weight of 25,000 or 270,000) improved their dispersibility in phosphate-buffered saline and cellular uptake. In addition, the redispersal of assembled PEI-coated MCPs was observed after the DCMF was turned off. The photothermal conversion efficiency of the MCPs was also improved using the DCMF. Consequently, the PEI-coated MCPs were first introduced into cells in a dispersed state, and their assembly was induced at the subcellular scale by applying a DCMF, and the assembly was spontaneously redispersed by switching off the DCMF. Such a remote control could improve the cytotoxicity of MCPs under near-infrared laser irradiation.

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“…The most widely reported method is to coat the nanoparticles with a protective shell to form core-shell nanocomposites. The materials of protective shell include silica [4][5][6][7][8][9][10], carbon [11,12], titanium oxide [13,14], polymers [15] etc. The core-shell nanocomposites have many potential applications, such as drug delivery, bioimaging, catalytic, electronic, microwave absorbents and environmental remediation [16][17][18][19][20][21].…”

mentioning

confidence: 99%

Synthesis of monodisperse Fe@SiO ₂ core‐shell nanocapsules and investigation of their magnetic behaviour

Zeng

Yang

Shao

et al. 2019

Micro & Nano Letters

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The monodisperse Fe@SiO 2 core-shell nanocapsules were synthesised via hydrothermal reaction followed with heat treatment. Nanostructures were characterised by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The magnetic properties of Fe@SiO 2 nanocapsules were evaluated with magnetic property measurement system. The results show that Fe@SiO 2 core-shell nanocapsules are highly monodispersed. The silica thickness of Fe@SiO 2 nanocapsules increased from 10-20 to 25-35 nm with increasing tetraethyl orthosilicate (TEOS) amount. In the Fe@SiO 2 nanocapsules prepared with 900 μl TEOS, as the reaction temperature increases, the mean particle size of Fe@SiO 2 nanocapsules increases from 328 to 546 nm. It is remarkable that the saturation magnetisation of Fe@SiO 2 nanocapsules decreases with increasing silica thickness. However, the coercivity of nanocapsules has less influence with the variation of silica thickness and particles' length.

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Synthesis, characterisation, and evaluation of core–shell Fe ₃ O ₄ /SiO ₂ /polypyrrole composite nanoparticles

Cited by 11 publications

References 34 publications

Facile Synthesis of Hollow Fe3O4-rGO Nanocomposites for the Electrochemical Detection of Acetaminophen

Facile Synthesis of Hollow Fe3O4-rGO Nanocomposites for the Electrochemical Detection of Acetaminophen

Intracellular Magnetic Control over the Reversible Assembly of Silica-Based Magnetic Composite Particles for Photothermal Therapy

Synthesis of monodisperse Fe@SiO ₂ core‐shell nanocapsules and investigation of their magnetic behaviour

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Synthesis, characterisation, and evaluation of core–shell Fe 3 O 4 /SiO 2 /polypyrrole composite nanoparticles

Cited by 11 publications

References 34 publications

Facile Synthesis of Hollow Fe3O4-rGO Nanocomposites for the Electrochemical Detection of Acetaminophen

Facile Synthesis of Hollow Fe3O4-rGO Nanocomposites for the Electrochemical Detection of Acetaminophen

Intracellular Magnetic Control over the Reversible Assembly of Silica-Based Magnetic Composite Particles for Photothermal Therapy

Synthesis of monodisperse Fe@SiO 2 core‐shell nanocapsules and investigation of their magnetic behaviour

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Product

Resources

About

Synthesis, characterisation, and evaluation of core–shell Fe ₃ O ₄ /SiO ₂ /polypyrrole composite nanoparticles

Synthesis of monodisperse Fe@SiO ₂ core‐shell nanocapsules and investigation of their magnetic behaviour