Open Access Original Research Article

Study of the Optical Properties of Cobalt Ferrite Magnetic Liquids

Nandiguim Lamai, Alexis Mouangué Nanimina, Djimako Bongo, Bonaventure Danoumbe, Togdjim Jonas

Asian Journal of Physical and Chemical Sciences, Page 1-5
DOI: 10.9734/ajopacs/2020/v8i230110

In this study, we discussed the optical properties (Faraday rotation, transmittance and Merit factor) of two samples of magnetic liquids synthesized by co-precipitation and an additional hydrothermal synthesis of cobalt ferrite (CoFe2O4) developed according to the protocol developed by R. Massart at the PHENIX laboratory at Pierre and Marie Curie University in the form of ferrofluids. The measurements were carried out using the spectral polarimetric bench (400-1600 nm). The materials did not meet the standard and did not allow a good Faraday rotation due to their preparation conditions. Cobalt ferrite is a hard ferrimagnetic material, having many important applications in the field of magnetic storage and spintronics. The results show a very high spectral Faraday rotation in the Telecom range (1550 nm) with good transparency in the infrared of the transmittance spectra and a strong merit factor around 1550 nm, with a value of the order of 11°. For a cobalt ferrite magnetic liquid obtained hydrothermally.

Open Access Original Research Article

Solvothermal Synthesis, Characterization and Cytotoxicity Study of Cobalt and Copper of Complexes Sulfamethoxazole

Usman Abubakar Adamu, Buhari Magaji, Adamu Baba Mohammad, Mukhtar Muhammad Sani, Zulaihat Isa Hussaini

Asian Journal of Physical and Chemical Sciences, Page 6-12
DOI: 10.9734/ajopacs/2020/v8i230111

The complexes of Co and Cu with sulfamethoxazole (SMZ) were synthesized in the 1:2 molar ratios. The physical characterization of the ligand and the complexes showed different colours with a good % yield and high melting point/decomposition temperature. The solubility test of the metal complexes and the free drug using various solvents of different polarity and proticity showed that the free drug and the metal complexes are soluble in polar and non-polar solvents. The IR results of the synthesized complexes displayed new peaks that are not present in the free drug, the bands are due to M-O and M-N thus, confirming the coordination. The result from the conductivity measurement shows that the complexes are non-electrolyte. More so, all the complexes were found to be toxic in brine shrimp lethality assay.

Open Access Original Research Article

WKB Energy Expression for the Radial Schrödinger Equation with a Generalized Pseudoharmonic Potential

E. Omugbe, O. E. Osafile, I. B. Okon

Asian Journal of Physical and Chemical Sciences, Page 13-20
DOI: 10.9734/ajopacs/2020/v8i230112

In this paper, we applied the semi-classical quantization approximation method to solve the radial Schrödinger equation with a generalized Pseudoharmonic potential. The four turning points problem within the framework of the Wentzel-Kramers-Brillouin (WKB) method was transformed into two turning points and subsequently, the energy spectrum was obtained. Some special cases of the generalized Pseudoharmonic potential are presented. The WKB approximation approach reproduces the exact energy expression obtained with several analytical methods in the literature.  The values of the energy levels for some selected diatomic molecules (N2, CO, NO, CH) obtained numerically are in excellent agreement with those from previous works in the literature.

Open Access Original Research Article

Aqueous Phase Adsorption of Pb (II) Ions onto Hymenoptera sphecidae (Mud-wasp) Nest

Donald T. Kukwa, Peter A. Adie, Rose E. Kukwa, Paula D. Kungur

Asian Journal of Physical and Chemical Sciences, Page 21-31
DOI: 10.9734/ajopacs/2020/v8i230113

Removal of Pb (II) ion from aqueous solution using Hymenoptera sphecidae (mud-wasp) nest was investigated using a batch process. The effect of pH, contact time and adsorbent dose were also investigated. The result showed that the adsorption of Pb (II) ion onto mud-wasp nest was dependent on pH, contact time and adsorbent dose. Adsorption patterns were analysed in terms of three bi-parameter isotherms of Langmuir, Freundlich and Temkin. Freundlich isotherm gave the best fit to the adsorption data with a correlation coefficient of 0.992, while monolayer sorption capacity yielded 41.667 mg/g. Lagergren’s pseudo first-order and pseudo second-order kinetic models were used to test the adsorption kinetics. The kinetic data were well described by the pseudo second-order kinetic model, suggesting that the process was chemisorption type.  The results showed that mud-wasp nest can be used as a low-cost adsorbent for the removal of Pb (II) ion from aqueous solutions.

Open Access Review Article

Rashba Spin-orbit Interaction in Semiconductor Nanostructures (Review)

Ibragimov Behbud Guseyn

Asian Journal of Physical and Chemical Sciences, Page 32-44
DOI: 10.9734/ajopacs/2020/v8i230115

In this work I review of the theoretical and experimental issue related to the Rashba Spin-Orbit interaction in semiconductor nanostructures. The Rashba spin-orbit interaction has been a promising candidate for controlling the spin of electrons in the field of semiconductor spintronics. In this work, I focus study of the electrons spin and holes in isolated semiconductor quantum dots and rings in the presence of magnetic fields. Spin-dependent thermodynamic properties with strong spin-orbit coupling inside their band structure in systems are investigated in this work. Additionally, specific heat and magnetization in two dimensional, one-dimensional quantum ring and dot nanostructures with Spin Orbit Interaction are discussed.