Hassan Karami; Foroozandeh Taala; Mohammad Ali Karimi; Reza Behjat-Manesh Ardakani
Abstract
In this work, sub-micro and nanometer sized Mg and Mg/carbon composites as anode materials of Mg-air batteries is prepared by using an innovative rotary ball mill. Characterization of the prepared samples is performed by dynamic light scattering, scanning electron microscopy, transmission electron microscopy ...
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In this work, sub-micro and nanometer sized Mg and Mg/carbon composites as anode materials of Mg-air batteries is prepared by using an innovative rotary ball mill. Characterization of the prepared samples is performed by dynamic light scattering, scanning electron microscopy, transmission electron microscopy and, X-ray diffraction techniques. The effects of milling time and amount of carbon additive are evaluated on the sizes of Mg particles in different samples, the discharge capacities and also other electrochemical performances of both primary and secondary magnesium air batteries. An aqueous solution of 2 M Magnesium Chloride and 3 M Sodium Chloride and an organic solution of 0.2 M I2 in Dimethyl Sulfoxide are used as electrolytes in primary and secondary Mg-air batteries, respectively. The Mg sample T6 with average particle size of 170 nm and the Mg/carbon composite sample T13 with average particle size of 35 nm show the highest discharge capacities in both primary (333.1 and 418.6 mA.h g-1) and secondary (354.4 and 433.9 mA.h g-1) Mg-air batteries, respectively. The cycle life test was examined on all constructed rechargeable Mg-air batteries over 30 cycles.
Ashraf Salmanipour; Mohammad Ali Karimi; Alireza Mohadesi; Mohammad Ali Taher; Shabnam Shafiee
Volume 3, Issue 1 , March 2016, , Pages 1-26
Abstract
Considerable interest in the analysis of urea in clinical, environmental and industrial samples has generated diverse research activities in the fabrication of urea biosensors over the past decades. These activities have been directed towards the use of wide ranging materials, including conducting polymers, ...
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Considerable interest in the analysis of urea in clinical, environmental and industrial samples has generated diverse research activities in the fabrication of urea biosensors over the past decades. These activities have been directed towards the use of wide ranging materials, including conducting polymers, non-conducting polymers, redox dyes, redox polymers, oxides, clays, zeolite, sol gel, carbon pastes, epoxy activated support and nanomaterials, for the immobilisation of urease and its use for the detection of urea. Many of these activities have also employed various modes of transduction, including amperometric, potentiometric, conductometric, optical, manometric, thermal and piezoelectric detection, for reliable biosensing of urea. This article reviews the various research efforts that have been carried out over the past decades on the construction and utilisation of urea biosensors for urea analysis in various samples.
Mohammad Ali Karimi; Abdolhamid Hatefi-Mehrjardi; Alireza Mohadesi; Sayed Zia Mohammadi; Mehdi Taghdiri; Javad Yarahmadi; Havva Mahmoodian; Shahla Nezhad Khorasani
Volume 1, Issue 1 , March 2014, , Pages 7-11
Abstract
In this work, a new, simple and fast method for the solid phase extraction-spectrophotometric determination of phosphate using cetyltrimethyl ammonium bromide immobilized on alumina-coated magnetite nanoparticles (CTAB@ACMNPs) has been developed. The determination of phosphate is based on the molybdenum ...
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In this work, a new, simple and fast method for the solid phase extraction-spectrophotometric determination of phosphate using cetyltrimethyl ammonium bromide immobilized on alumina-coated magnetite nanoparticles (CTAB@ACMNPs) has been developed. The determination of phosphate is based on the molybdenum blue method which was monitored at λmax of 810 nm. MNPs and ACMNPs characterized by SEM, VSM, and XRD spectroscopy. This method avoided the time-consuming column-passing process of loading large volume samples in traditional SPE through the rapid isolation of CTAB@ACMNPs with an adscititious magnet. Under the optimal experimental conditions, the preconcentration factor (PF), detection limit (DL), linear range (LR) and relative standard deviation (RSD) of phosphate were 80 (for 400 mL of sample solution), 0.038 µg mL−1, 0.8-10.0 µg mL−1 and 2.5 % (for 5.0 µg mL-1, n=7), respectively. The proposed method was successfully applied to the separation/preconcentration and determination of phosphate in different water samples and suitable recoveries were obtained.
