The particle size distribution (PSD) as criteria for comparison of silver powders obtained by different methods of synthesis and by conditions of electrolysis

Abstract

Silver powders produced by both electrochemical (galvanostatic (DC) and potentiostatic (POT) regimes of electrolysis) and chemical processes were examined by scanning electron microscope, and particle size distribution (PSD) of the obtained particles was done. In the DC regime, the current densities of-14.4 mA cm-2 for the nitrate (NIT; powder denoted with DC(NIT)) and-13.05 mA cm-2 for the ammonium (AM; DC(AM)) electrolytes were applied. In the POT regime, the used overpotentials were-90 mV (NIT(90)) and-150 mV (NIT(150)) for the nitrate, and-625 mV (AM(625)) and-925 mV (AM(925)) for the ammonium electrolytes. Reduction with hydrazine was used for chemical synthesis (powder denoted with HYD). On the basis of SEM and PSD analysis, Ag powders were grouped into three groups. In the first group DC(AM), AM(925) and HYD powders with the (8.4-8.9 %) volume ratios were placed. In the second group were AM(625) and DC(NIT) powders with the (6.5-6.6 %) volume ratios. NIT(90) and NIT(150) powders with the volume ratios of (5.2-5.7 %) made the third group. The obtained volume ratios were correlated with the morphology of synthesized particles in order to perceive advantages and lacks of powder production via electrochemical and chemical routes.

Overpotential controls a morphology of electrolytically produced copper dendritic forms

“…The increase in the current density after an electrolysis time of 15 min indicates to the formation and growth of dendrites. 22 The real current density remains constant, while the electrode surface area increases with time and as a result, the current density increases with time in the potentiostatic regime of electrolysis. 19,23 The attained amounts of electricity of 2.4 and 4.8 mA h cm -2 are denoted by vertical lines in Fig 1a. The chrono-potentiometric dependence obtained at a current density of 14.4 mA cm -2 is shown in Fig.…”

Correlation between Seminal Fructosamine and Glycosylation Gap and Some Sex Hormones in the Young Infertile Male in Mosul City

“…Serum and Plasma of semen fructosamine by NBTspectrophotometric method (14) . The concentrations of K, Mg, and Zn in serum and seminal plasma detected with Electrolyte Analyzer-PSD (14) and the hormones assayed using multi-parametric immune analyzer MINI VIDAS® automated immunoassay system by Biomerix (France) (15) . Data will represent as Mean ± SD and analyze using SPSS software.…”

Synthesis of dendritic silver nano powder using pulsing electrolysis in ammonia solution

“…Pulsing electrolysis is a method to produce high purity nano powder that has been applied for producing nanosized copper powders [23]. It has been reported that by utilizing different regimes of electrolysis which are galvanostatic and potentiostatic, and by chemical route using hydrazine as reduction agent, various shapes and size distribution of silver powder have been obtained [24].…”