Effect of diamagnetic contribution of water on harmonics distribution in a dilute solution of iron oxide nanoparticles measured using high-Tc SQUID magnetometer

Saari, Mohd Mawardi; Tsukamoto, Yuya; Kusaka, Takuya; Ishihara, Yuichi; Sakai, Kenji; Kiwa, Toshihiko; Tsukada, Keiji

doi:10.1016/j.jmmm.2015.06.090

Cited by 17 publications

(9 citation statements)

References 24 publications

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“…For comparison, we calculated the magnetization curves for well dispersed, non-interacting MNP in LC medium, shown in Figure 3 . In such colloid, both components, ferromagnetic from MNPs and diamagnetic from LC, contribute to final magnetization ( Saari et al., 2015 ). The comparative analyses of experimental measurement and calculations are shown in Figure 4 .…”

Section: Resultsmentioning

confidence: 99%

Clustering in ferronematics—The effect of magnetic collective ordering

et al. 2021

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Summary Clustering of magnetic nanoparticles can dramatically change their collective magnetic properties, and it consequently may influence their performance in biomedical and technological applications. Owing to tailored surface modification of magnetic particles such composites represent stable systems. Here, we report ferronematic mixtures that contain anisotropic clusters of mesogen-hybridized cobalt ferrite nanoparticles dispersed in liquid crystal host studied by different experimental methods—magnetization measurements, small-angle X-ray scattering (SAXS), small-angle neutron scattering (SANS), and capacitance measurements. These measurements reveal non-monotonic dependencies of magnetization curves and the Fréedericksz transition on the magnetic nanoparticles concentration. This can be explained by the formation of clusters, whose structures were determined by SAXS measurements. Complementary to the magnetization measurements, SANS measurements of the samples were performed for different magnetic field strengths to obtain information on the orientation of the liquid crystal molecules. We demonstrated that such hybrid materials offer new avenues for tunable materials.

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Section: Resultsmentioning

confidence: 99%

Clustering in ferronematics—The effect of magnetic collective ordering

et al. 2021

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“…Recently SQUIDs-magnetometers have been used for immunoassay (Nakatani et al, 2012;Saari et al, 2015;Park, 2016;Rong et al, 2016;Liao et al, 2017). Thus, the use of magnetic markers in combination with the detection of SQUIDs allowed reducing detection in a standard ELISA.…”

Section: Methods For Detecting Of Systems Based On Mpsmentioning

confidence: 99%

Modern magnetic immunoassay: Biophysical and biochemical aspects

Galkin

Besarab

Pysmenna

et al. 2017

Regul. Mech. Biosyst.

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In this review article an analysis of the biochemical and biophysical aspects of modern magnetic immunoassay (MIA) is conducted and additionally the problems and perspectives of its application in biology, biotechnology and medicine are defined. Magnetic immunoassay should be considered as an evolutionary extension of the classical immunoassay. MIA can have many variants of modifications, similar to the classic immunoenzymatic assay. The key distinctive element of the MIA is the use of magnetic particles (MPs), which are usually nanoparticles. MPs in the MIA can act as a marker for detection, or the solid phase at which the immunochemical reaction takes place. MIA possesses basic advantages over classical immunoassay methods: thanks to the unique magnetic properties of the MPs and the ability to manipulate it in the external magnetic field, it is possible to increase the informative value of the analysis (first of all, sensitivity and specificity), as well as the rigid requirements for “purity” of tested samples. For the purposes of immunoassay, magnetic particles of size from 10 to 200 nm are important, since such particles are in a superparamagnetic state, in the absence of strong magnetic fields; they are not agglomerated in a liquid medium. The size of the spherical particle determines the rate of sedimentation and mobility in the solution. The outer polymeric membrane serves as a matrix in which the surface functional groups are added, and also protects the core of the metal from the external environment. The outer shell may also consist of agarose, cellulose, porous glass, silicon dioxide etc. There are several strategies for the synthesis of nanoparticles: mechanical (dispersion), physical (gas phase deposition), wet chemical methods (chemical comprecipitation, thermal decomposition, methods of micro emulsion, hydrothermal reactions) and physico-chemical methods. Also used are magnesite nanoparticles of biogenic origin. Magnetic particles may function, and this is important for immunoassay. Surface functional groups include carboxylic, amino, epoxy, hydroxyl, tosyl, and N-hydroxysuccinate-activated groups. Magnetic spherical particles usually interact with surface molecules such as streptovidine, biotin, protein A, protein G, and immunoglobulin etc. Directions and prospects of the development of methods of magnetic immunoassay are determined, mainly, by the development of methods for detecting or influencing magnetic particles. In this case, the classical methods of detection are electrochemical methods, electrochemiluminescence, fluorescence. More modern ones include giant magnetoresistance, superconducting quantum interference devices, surface-enhanced Raman spectroscopy, biosensors based on nonlinear magnetization, magneto-PCR immunoassay. The current trend is to combine or integrate the application of various biochemical, physical, molecular and genetic, physico-chemical detection methods. In fact, all of these benefits undoubtedly open up broad prospects for the practical application of MIA in biology, biotechnology and medicine.

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“…Because pure water is diamagnetic, with signals linear to the applied magnetic field, the measured third harmonic signals contained only the signals from the MNPs. 30 The systems were operated and maintained at 297 K. Femtosecond Laser Pulse Irradiation. An Er-doped fiber laser, which produces a femtosecond laser pulse with a pulse width of approximately 150 fs and full width at a half maximum, was used as the optical source.…”

Section: ■ Conclusionmentioning

confidence: 99%

Dispersion of Fe₃O₄ Nanoparticle Beads Driven by Femtosecond Laser Pulses for Quantitative Magnetic Immunoassay Measurements

Kishimoto

Kuroda

Tsubota

et al. 2022

ACS Appl. Nano Mater.

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Magnetic nanoparticles (MNPs) are widely employed in various medical applications. The magnetic immunoassay (MIA) has good potential for pathological diagnosis to detect biomaterials in the human body. However, MIA signals are generally affected by the aggregation of MNPs; therefore, the dispersion of MNPs during measurements is important for the quantitative measurement of immune reactions. In this study, we proposed a process for the nonthermal dispersion of MNPs using femtosecond pulse laser irradiation. To evaluate the disparity of the MNPs in the solution, the change in the magnetic signals of MNPs was measured using the developed MIA systems. Only magnetic signals of MNPs were detected by the third-harmonic measurement. Nano-sized ferrites made of magnetite (Fe3O4) coated with polyglycidyl methacrylate in pure water were used as MNP samples, and a recovery rate of 15.8% in the magnetic signals was observed before and after femtosecond pulse laser irradiation. The laser had an average power of 150 mW and a pulse width of 150 fs with a full-width at half maximum of peak intensity. This result indicates that femtosecond pulse laser irradiation is a good candidate for the dispersion of MNPs in MIA systems.

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Effect of diamagnetic contribution of water on harmonics distribution in a dilute solution of iron oxide nanoparticles measured using high-Tc SQUID magnetometer

Cited by 17 publications

References 24 publications

Clustering in ferronematics—The effect of magnetic collective ordering

Clustering in ferronematics—The effect of magnetic collective ordering

Modern magnetic immunoassay: Biophysical and biochemical aspects

Dispersion of Fe₃O₄ Nanoparticle Beads Driven by Femtosecond Laser Pulses for Quantitative Magnetic Immunoassay Measurements

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Effect of diamagnetic contribution of water on harmonics distribution in a dilute solution of iron oxide nanoparticles measured using high-Tc SQUID magnetometer

Cited by 17 publications

References 24 publications

Clustering in ferronematics—The effect of magnetic collective ordering

Clustering in ferronematics—The effect of magnetic collective ordering

Modern magnetic immunoassay: Biophysical and biochemical aspects

Dispersion of Fe3O4 Nanoparticle Beads Driven by Femtosecond Laser Pulses for Quantitative Magnetic Immunoassay Measurements

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Dispersion of Fe₃O₄ Nanoparticle Beads Driven by Femtosecond Laser Pulses for Quantitative Magnetic Immunoassay Measurements