Magnetic-field-assisted synthesis of anisotropic iron oxide particles: Effect of pH

Shibaev, Andrey V.; Shvets, P. V.; Kessel, Darya E; Kamyshinsky, Roman; Orekhov, Anton S.; Абрамчук, С. С.; Khokhlov, Alexei R.; Philippova, Olga E.

doi:10.3762/bjnano.11.107

Cited by 8 publications

(9 citation statements)

References 58 publications

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“…To prepare the TEM specimens, a drop (10 μL) of a pre-sonicated NPs aqueous solution was deposited onto a copper grid and air-dried under ambient conditions. Typical preparation of the TEM specimens is described elsewhere [ 44 , 45 ]. According to the TEM data, NPs are almost spherical and rather monodisperse, and their mean size equals to 20 nm ( Figure 2 A).…”

Section: Methodsmentioning

confidence: 99%

Remotely Self-Healable, Shapeable and pH-Sensitive Dual Cross-Linked Polysaccharide Hydrogels with Fast Response to Magnetic Field

et al. 2021

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The development of actuators with remote control is important for the construction of devices for soft robotics. The present paper describes a responsive hydrogel of nontoxic, biocompatible, and biodegradable polymer carboxymethyl hydroxypropyl guar with dynamic covalent cross-links and embedded cobalt ferrite nanoparticles. The nanoparticles significantly enhance the mechanical properties of the gel, acting as additional multifunctional non-covalent linkages between the polymer chains. High magnetization of the cobalt ferrite nanoparticles provides to the gel a strong responsiveness to the magnetic field, even at rather small content of nanoparticles. It is demonstrated that labile cross-links in the polymer matrix impart to the hydrogel the ability of self-healing and reshaping as well as a fast response to the magnetic field. In addition, the gel shows pronounced pH sensitivity due to pH-cleavable cross-links. The possibility to use the multiresponsive gel as a magnetic-field-triggered actuator is demonstrated.

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Section: Methodsmentioning

confidence: 99%

Remotely Self-Healable, Shapeable and pH-Sensitive Dual Cross-Linked Polysaccharide Hydrogels with Fast Response to Magnetic Field

et al. 2021

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“…The selected area diffraction pattern (SAED) pattern, shown in Figure 5d, confirms the polycrystalline nature of the samples and the crystal planes corresponding to the hexagonal wurtzite structure of zinc oxide [41]. The average length and thickness of the nanosheets were estimated from the distribution histograms from the TEM micrographs [42]. The average length (Figures 5e and 5f) and thickness of the nanosheets were calculated to be 276 nm and 48 nm, respectively.…”

Section: Characterization Of As Prepared Zno and Nà Znomentioning

confidence: 56%

Electrochemical pH sensing characteristics of nitrogen‐doped zinc oxide nanostructures using a screen‐printed platform**

Mary Manoj,

Rose Viannie

2023

Electroanalysis

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Monitoring pH variations is of vital importance in the field of medical diagnostics and healthcare devices. Employing zinc oxide (ZnO) nanomaterials as active sensing elements allows sensitivity enhancement by increasing the surface area of the nanomaterials used and improving the charge transfer mechanism in the sensor. In this study, an electrochemical pH sensor based on nitrogen‐doped zinc oxide nanosheets was developed using a single step hydrothermal technique. The results obtained show the successful incorporation of nitrogen into the crystal structure of ZnO nanosheets. The sensing platform was fabricated using a simple mask‐printing technique using carbon electrodes on a polyimide substrate. The sensing characteristics of nitrogen‐doped ZnO (N−ZnO) nanosheets as pH sensors are evaluated for the first time. The results show that the response time and performance improved with nitrogen doping, for a lower analyte volume of just 5 mL. Furthermore, the detailed mechanism of pH sensing was formulated using electrochemical impedance spectroscopy (EIS). The resistance obtained was directly proportional to the charge‐transfer resistance at the electrode‐electrolyte interface for N−ZnO. The sensitivity as determined by charge‐transfer resistance is 0.512 MΩ/pH. Further, the chronoamperometric studies show a sensitivity of 0.156 μA/pH. The response characteristics also reveal a linearity of 0.965 over a pH range of 3 to 9. Hence, the study shows the exceptional response of N−ZnO nanostructures in pH sensing applications. The advantages of the N−ZnO nanosheets include higher sensitivity, flexibility, and a smaller volume of testing fluid that promotes their easy integration into various analytical applications.

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“…While analysis of SEM and HRTEM images can be used to demonstrate the shape and size of synthesized ANPs or isotropic nanoparticles, a comprehensive analysis of ANPs should include evaluation of interplanar spacings; however, for iron- and oxygen-containing compounds, these may have similar values. Thus, it becomes necessary to measure several values of interplanar spacings and angles between definite crystallographic planes [ 66 ]. In the case of magnetic iron oxide ANPs, M s is a basic parameter that should be measured to determine their magnetic characteristics.…”

Section: Resultsmentioning

confidence: 99%

A Comprehensive Study of Synthesis and Analysis of Anisotropic Iron Oxide and Oxyhydroxide Nanoparticles

et al. 2022

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One-dimensional anisotropic nanoparticles are of great research interest across a wide range of biomedical applications due to their specific physicochemical and magnetic properties in comparison with isotropic magnetic nanoparticles. In this work, the formation of iron oxides and oxyhydroxide anisotropic nanoparticles (ANPs) obtained by the co-precipitation method in the presence of urea was studied. Reaction pathways of iron oxide and oxyhydroxide ANPs formation are described based on of X-ray diffraction (XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), and pulse magnetometry studies. It is shown that a nonmonotonic change in the Fe3O4 content occurs during synthesis. The maximum content of the Fe3O4 phase of 47.4% was obtained at 12 h of the synthesis. At the same time, the reaction products contain ANPs of α-FeOOH and submicron isotropic particles of Fe3O4, the latter formation can occur due to the oxidation of Fe2+ ions by air-oxygen and Ostwald ripening processes. A subsequent increase in the synthesis time leads to the predominant formation of an α-FeOOH phase due to the oxidation of Fe3O4. As a result of the work, a methodological scheme for the analysis of iron oxide and oxyhydroxide ANPs was developed.

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Magnetic-field-assisted synthesis of anisotropic iron oxide particles: Effect of pH

Cited by 8 publications

References 58 publications

Remotely Self-Healable, Shapeable and pH-Sensitive Dual Cross-Linked Polysaccharide Hydrogels with Fast Response to Magnetic Field

Remotely Self-Healable, Shapeable and pH-Sensitive Dual Cross-Linked Polysaccharide Hydrogels with Fast Response to Magnetic Field

Electrochemical pH sensing characteristics of nitrogen‐doped zinc oxide nanostructures using a screen‐printed platform**

A Comprehensive Study of Synthesis and Analysis of Anisotropic Iron Oxide and Oxyhydroxide Nanoparticles

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