Construction and calibration of a low cost and fully automated vibrating sample magnetometer

El-Alaily, T.M.; El-Nimr, M. K.; Saafan, S.A.; Kamel, M.; Meaz, T.M.; Assar, S.T.

doi:10.1016/j.jmmm.2015.03.051

Cited by 48 publications

(15 citation statements)

References 15 publications

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“…Sodium hydroxide (Sodium hydroxide pellets AR assay 99.5 %, MW. 40.00, SO. 55592, Egypt), trypan blue, phosphate buffer solution (PBS, Ph 7 phosphate, B-01868, Mumbai, India), Hanks balanced salt solution (HPSS) (1X W/ Phenol red and sodium bicarbonate, TL 1003, India), ESR tubes contain 3.8 % buffered Lithium Citrate solution (0.129 mol/L)(INTERMEDIA, EGYPT).…”

Section: Methodsmentioning

confidence: 99%

“…The magnetic behavior of nanoparticle suspensions was attempted by vibrating sample magnetometer (VSM) option of a quantum design physical property measurement system (PPMS) equip (Lake Shore-7410, USA) with a superconducting 9 Tesla magnet. Hysteresis loops of sample acquired at selected temperatures in the range of 3 -350 K, and magnetic fields ranged from -8 to 8 Tesla [40].…”

Section: Magnetic Measurementsmentioning

confidence: 99%

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Cytotoxicity and Hemostatic One Step Green Synthesis of Iron Nanoparticles Coated with Green Tea for Biomedical Application

2022

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Heparin and its low molecular weight are anticoagulants that prevent the formation and extension of blood clots. However, these anticoagulant causes bleeding that takes longer to stop. Here, we explore using magnetic iron oxide (Fe3O4NPs) coated with green tea (GTPs) as a safe and effective nontherapeutic agent for blood clotting prevention. In this work, Magnetic iron oxide coated with green tea (GT@Fe3O4NPs) was successfully synthesized using a simple eco-friendly green method. Green tea is employed as a green reducing and stabilizing agent. We employed this method as a new low-cost and time-consuming route. Structural, blood biocompatibility and anticoagulant properties of the (GT@Fe3O4NPs) were analyzed. These analyses showed that the particles were of uniform shapes and sizes of 25 - 36 nm with a coating of GTPs. The vibrating sample magnetometer (VSM) measurement demonstrated a saturation magnetization of 4.90 emu/g with negligible coercivity and retentivity, indicating the superparamagnetic behavior of the GT@Fe3O4NPs at room temperature. The synthesized magnetic nanoparticles were highly stable and well-dispersed in an aqueous medium through their hydrophilic coating of GTPs. Cell viability and prothrombin time (PT) showed excellent blood compatibility in addition to promising anticoagulant ability, respectively. The work offers a novel, safe nanotherapeutic agent as a substitutional for heparin. As a result, GT@Fe3O4NPs can compete with heparin either in hemodialysis or the treatment of thromboembolic events as it can overcome related bleeding problems to a great extent. HIGHLIGHTS Magnetic iron oxide (Fe3O4 NPs) coated with green tea (GTPs) could be a safe substitutional of heparin, overcoming side effects of heparin such as bleeding Magnetic iron oxide (Fe3O4 NPs) coated with green tea (GTPs) can advance anticoagulant drugs by increasing control of the anticoagulant (e.g., decreasing the dose and reducing side effects while maintaining efficacy and increasing circulation) The new magnetic iron oxide (Fe3O4 NPs) coated with green tea (GTPs) anticoagulant drugs will profit patients undergoing high-risk surgical procedures and overcome anticoagulant-related bleeding problems to a great extent GRAPHICAL ABSTRACT

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Section: Methodsmentioning

confidence: 99%

Section: Magnetic Measurementsmentioning

confidence: 99%

Cytotoxicity and Hemostatic One Step Green Synthesis of Iron Nanoparticles Coated with Green Tea for Biomedical Application

2022

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“…Zeta potential Inc. Santa Barbara, Calif (USA) con rmed the dispersion of catalyst in a solution. The magnetic properties of as-prepared samples were measured using handmade VSM (Tanta, Egypt) (El-Alaily et al 2015). The UV-VIS T80+ double-beam has been used to monitor the AB dye concentration in the solution.…”

Section: Characterization Methodsmentioning

confidence: 99%

The assisting-approach of horseradish peroxidase immobilized onto amine-functionalized superparamagnetic iron oxide nanoparticles as a biocatalyst

Keshta

Gemeay

Khamis

2021

Preprint

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To enhance the removal of dye, horseradish peroxidase (HRP) was immobilized onto amine-functionalized superparamagnetic iron oxide and used as a biocatalyst for the oxidative degradation of Acid black-HC dye. The anchored enzyme was characterized by sets of techniques such as vibrating sample magnetometer, Fourier transform infrared, X-ray diffraction, thermogravimetric, scanning electron microscopy, BET and BJH methods, nitrogen adsorption-desorption measurements , Zeta potential, energy dispersive X-ray (EDX), and transmission electron microscopy. The Michaelis constant (K m ) values of free peroxidase and immobilized horseradish peroxidase were determined that equal 4.5 and 5 mM for hydrogen peroxide; 12.5 and 10 mM for guaiacol, respectively. Besides, the free peroxidase is thermally stable at 40°C however, the immobilized enzyme was up to 60°C. In the catalytic experiment, the immobilized HRP showed superior catalytic activity compared with free HRP for the oxidative decolorization and removal of Acid black-HC dye. The impacts of experimental parameters for instance catalyst dosage, pH, H 2 O 2 concentration, and temperature, were investigated. The reaction followed second-order kinetics and the thermodynamic activation parameters were determined.

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“…Magnetic characterization of the investigated nanoparticles has been performed at room temperature by a lab-built vibrating sample magnetometer (VSM) [24] with a maximum magnetic field up to 8 kOe.…”

Section: Characterizationmentioning

confidence: 99%

Preparation and Magnetic Properties of Cu Ni Al Ferrite Nanoparticles and Polypyrrole/Cu0.5Ni0.5Al0.3Fe1.7O4 Composite

2020

Egyptian Journal of Solids

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Nanostructure copper nickel aluminum ferrite samples (Cu0.5Ni0.5AlxFe2-xO4, x=0, 0.1, 0.2, 0.3 and 0.4) have been synthesized by using the citrate precursor technique. Then, a PPy/Cu0.5Ni0.5Al0.3Fe1.7O4 composite sample has been prepared by polymerization of polypyrrole (PPy) monomer in the presence of Cu0.5Ni0.5Al0.3Fe1.7O4 nanoparticles. The characterizing techniques used in the present investigation are X-ray diffraction analysis (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectrometry (FTIR) and vibrating sample magnetometer (VSM) measurements. The results have revealed the pure formation of the desired ferrite nanoparticles. The formation of PPy has been evidenced by FTIR. The lattice constant and the theoretical density Dx have been found to decrease by increasing the aluminum content, whereas the Debye temperature and the elastic moduli have increased. The SEM image of the composite has obviously clarified that the ferrite particles are dispersed nearly homogeneously in the polymer matrix. The hysteresis loops of all samples have proved that they can be classified as soft magnetic materials. Moreover, the saturation magnetization Ms of the ferrite series has been found to decrease with the increase in Al content and also has further decreased in the composite as expected. The coercivity Hc has low values in general. Moreover, its value of the composite is higher compared to that of the pure Cu Ni ferrite because the PPy increases the surface anisotropy, whereas it is almost equal to the coercivity of the Al containing ferrites, indicating some similarity of introducing Al and PPy to the material from the perspective of interruption of the ferrimagnetic order. The low coercivity of the samples are required in important devices which depend on soft magnetic materials such as switching devices and high frequency transformers.

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Construction and calibration of a low cost and fully automated vibrating sample magnetometer

Cited by 48 publications

References 15 publications

Cytotoxicity and Hemostatic One Step Green Synthesis of Iron Nanoparticles Coated with Green Tea for Biomedical Application

Cytotoxicity and Hemostatic One Step Green Synthesis of Iron Nanoparticles Coated with Green Tea for Biomedical Application

The assisting-approach of horseradish peroxidase immobilized onto amine-functionalized superparamagnetic iron oxide nanoparticles as a biocatalyst

Preparation and Magnetic Properties of Cu Ni Al Ferrite Nanoparticles and Polypyrrole/Cu0.5Ni0.5Al0.3Fe1.7O4 Composite

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