Characterization of Supermagnetic Magnetite Powder Synthesized with Water Extracts of Moringa oleifera Leaves and FeCl2·7H2O
Gérard Niasa Mata,
Pierre Osomba Lohohola,
Désiré Kabuya Tshibangu,
Hercule Mulonda Kalele,
Thierry Dani Mawete,
Omer Muamba Mvele,
Jérémie Lunguya Muswema,
Remy Imboyo Ndjoko,
Gracien Bakambo Ekoko
Issue:
Volume 10, Issue 3, September 2021
Pages:
41-44
Received:
7 June 2021
Accepted:
21 June 2021
Published:
13 July 2021
Abstract: The surface coated magnetite nanoparticles dispersed into water can be used in clinical for magnetic resonance imaging, for medical diagnosis and for magnetic field-assisted cancer therapy. Based on their applications in many fields, several methods are widely used and reported in literature for the synthesis of iron oxide nanoparticles. In the present paper, we report on the green synthesis of magnetite phase of iron oxide nanoparticles (Fe3O4), which were fabricated using water extracts from the leaves of Moringa oleifera and the inorganic salt FeCl2·7H2O, as iron precursor. The obtained powder was characterized through spectroscopic and thermal methods. The vibrating sample magnetometer was used in order to find out about the magnetic properties of the prepared sample. The Fourier transform infrared spectra (FT-IR) have shown peaks at 402 cm-1 and 593 cm-1, thus confirming the presence of magnetite in powder. X-ray diffraction gave peaks confirming the presence of Fe3O4 in its magnetite phase. Electronic transmission microscopy had indicated that the crystals obtained was of a spherical shape with an average diameter of 50 nm. Gravimetric thermal analysis (GTA) showed a peak centered at around 332°C, signalizing the thermal decomposition of the magnetite. The magnetic properties of the prepared powder exhibited the measured lower coercivity and remanence, demonstrating that the powder under study was made of superparamagnetic particles, suggesting that the prepared magnetite could be a possible candidate for biomedical applications.
Abstract: The surface coated magnetite nanoparticles dispersed into water can be used in clinical for magnetic resonance imaging, for medical diagnosis and for magnetic field-assisted cancer therapy. Based on their applications in many fields, several methods are widely used and reported in literature for the synthesis of iron oxide nanoparticles. In the pre...
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Computational Studies of the Role of Substituents on the Reactivity and Biological Activities of Naphthoic Acid
Azeema Munir,
Sidra Ayaz,
Afzal Shah,
Tayyaba Kokab,
Faiza Jan Iftikhar,
Anwar-ul-Haq Ali Shah,
Muhammad Abid Zia
Issue:
Volume 10, Issue 3, September 2021
Pages:
45-53
Received:
21 June 2021
Accepted:
12 July 2021
Published:
24 July 2021
Abstract: Substituents play a major role in influencing the reactivity and biological activity of aromatic compounds. Substituents affect the conductivity of molecular electronic and photoresponsive switches, light harvesting dye-sensitized solar cells and organic electroluminescent devices. A number of quantum mechanical methods corresponding to stabilization energy, charge of substituent active region, energy dispersive analysis, and molecular electrostatic potential help in the description of substituent effect in aromatic systems. In the present work we carried out computational studies for the estimation of chemical and structural properties of a chemical library of nine ortho substituted naphthoic acids. The chemical reactivity of the selected substituted naphthoic acids was assessed from a number of physicochemical properties such as total energy, HOMO-LUMO gap, chemical hardness, binding energy, ionization potential, electron affinity, electronegativity, electrochemical potential, global softness, electrophilicity and dipole moment. The effect of the electron-donor groups on conjugation of ortho substituted naphthoic acid was investigated by correlating the calculated rotational barriers of transition state of cis and trans ortho-substituted naphthoic acids to observe change in single bond length, double bond length, bond angle, dihedral angle, and rotational frequency of carboxylic group of substituted napthoic acids. The rotational barrier correlated with the geometric, atomic, molecular, and spectroscopic parameters. Moreover, quantitative structure–activity relationship (QSAR) analyses was performed and the obtained structural properties were linked with biological activities.
Abstract: Substituents play a major role in influencing the reactivity and biological activity of aromatic compounds. Substituents affect the conductivity of molecular electronic and photoresponsive switches, light harvesting dye-sensitized solar cells and organic electroluminescent devices. A number of quantum mechanical methods corresponding to stabilizati...
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