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Showing 3 results for Haghshenas
Polyol as a Tunable Method for Synthesizing Null and One-dimensional Ag and Ag-Cu Nanostructures
D. Haghshenas, A. Amirjani,
Volume 36, Issue 4 (Journal of Advanced Materials-Winter 2018)
Abstract
In this study, null and one-dimensional nanoparticles and nanostructures of Ag and Ag-Cu were synthesized using polyol method. In order to prepare different nanostructures with the same synthesis route, thermodynamics and kinetic conditions of the system were manipulated. In the thermodynamics approach, the nanostructures with the minimum surface energy were obtained as the final product, while in kinetic approach, the nanostructures with the lower activation energy were formed. By using these appraoches, Ag and Ag-Cu spherical and cubical nanostructures were produced in the size range of 90-100 nm. Also, by manipulating the kinetic conditions of the system, silver nanowires with the diameters in the range of 100-200 nm and the length of several microns were obtained successfully. The effect of Cu ions (Cu2+) on aspect ratio of the synthesized silver nanowires by polyol method was evaluated.

The Effect of Tartrate Ion on the Separation Behavior of Zinc and Cadmium in the Sulfate Solution
A. Vahedi, H. Nadimi, D. Haghshenas Fatmesari, S. Firoozi,
Volume 37, Issue 3 (Journal of Advanced Materials-Fall 2018)
Abstract
The aim of this study was to investigate the effect of tartrate ion (C4H4O62-) on the extraction and separation of zinc and cadmium using D2EHPA extractant. The presence of tartrate ion in the solution caused the shift of  the  extraction curve of zinc and cadmium to the more alkaline pH; however, the shifting rate for the cadmium extraction curve was more significant. In the absence of tartrate ion, ΔpH50% value was equal to 0.65. If 0.2 M tartrate ion were added to the aqueous phase, ΔpH50% value would increase to 1.09. The FT-IR analysis of organic phase showed that tartrate ion absorbed the organic phase along with zinc and cadmium. "Slope analysis method" also showed that 0.25 M and 0.5 M tartrate ion participated in the zinc-tartrate and cadmium-tartrate complex formation, respectively; however, extraction number was changed with increasing the tartrate ion concentration.

The Effect of Rheological Parameters on the Behavior of Silicon Nitride-Starch Slurry Used in Gelcasting Porous Silicon Nitride
M. Haghshenas Gorgani, M. Mirkazemi, F. Golestanifard,
Volume 37, Issue 4 (Journal of Advanced Materials-winter 2019)
Abstract
In this research, the rheological behavior and stability of suspensions containing Si3N4, Al2O3, Y2O3 and starch were investigated in order to use them in the starch consolidation casting of porous silicon nitride. Dolapix CE64 was used as the dispersant. Then, the effect of some parameters such as Si3N4 surface oxidation, dispersant content, solid loading and starch content on the viscosity and rheological behavior of Si3N4-starch slurry was determined. Surface oxidation of Si3N4 powder at 800°C for 2 hours reduced the viscosity of the slurry, effectively. The best dispersant content was 0.4 wt. %, relative to ceramic powders. Slurries containing 30 to 40 vol. % and 7.5 to 25 vol. % starch, relative to total solid loading, had the suitable viscosity and the sufficient stability for casting by the starch consolidation method.

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