Silver and Copper Microstructures: The Workfunction’s Effect
Tahir Mehmood,
Aiman Mukhtar
Issue:
Volume 5, Issue 1, February 2017
Pages:
1-6
Received:
9 February 2017
Accepted:
Published:
10 February 2017
Abstract: To understand the growth mechanism of Ag and Cu nanowires we have studied the effect of workfunction on the metal nanowire growth by XRD, SEM and Potentiostat. Under the same potential and overpotential, the metal with a smaller workfunction has a higher current density, i.e. current density for Ag is higher than of Cu nanowires. Likewise metals, the plane with smaller workfunction grows faster than with the larger workfunction, thus the preferential growth plane is (220) for both metals. We argued that the current arises from electrons tunneling from metal surface to hydrated metal and hydrogen ions. The metal with a smaller workfunction has a thinner barrier for tunneling, thus leading to a higher current density. It is found that deposition method have no such effect on the structure of deposited nanowires.
Abstract: To understand the growth mechanism of Ag and Cu nanowires we have studied the effect of workfunction on the metal nanowire growth by XRD, SEM and Potentiostat. Under the same potential and overpotential, the metal with a smaller workfunction has a higher current density, i.e. current density for Ag is higher than of Cu nanowires. Likewise metals, t...
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Study the Formation Possibility of some Iron Slag Based Glasses
H. M. Gomaa,
A. G. Mostafa,
M. M. H. Eshtewi
Issue:
Volume 5, Issue 1, February 2017
Pages:
7-10
Received:
5 September 2016
Accepted:
25 January 2017
Published:
24 February 2017
Abstract: In an attempt to take advantage of industrial wastes, Iron slag was used to prepare some of glass samples in an attempt to re-use. The following chemical formula has considered in the preparation process. (25 + x) % slag + (75 - x) % (Na2B4O7.10H2O), where x has varied among different values. The rapid quenching method has used to prepare the glass samples, of thier molten components at 1200°C. When x > 45 had not be obtained any glasses, in the conditions of preparation. Both FTIR and XRD showed that each sample contains x ≤ 45 had formed perfect glass state. Density and molar volume showed that the glass structure became more open with increasing concentration of the slag.
Abstract: In an attempt to take advantage of industrial wastes, Iron slag was used to prepare some of glass samples in an attempt to re-use. The following chemical formula has considered in the preparation process. (25 + x) % slag + (75 - x) % (Na2B4O7.10H2O), where x has varied among different values. The rapid quenching method has used to prepare the glass...
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Adsorption of Pb (II), Cu (II), and Zn (II) Ions onto Urtica dioica Leaves (UDL) as a Low Cost Adsorbent: Equilibrium and Thermodynamic Studies
Priyanka Tiwari,
Mahesh Chandra Vishwakarma,
Sushil Kumar Joshi,
Harish Sharma,
Narendra Singh Bhandari
Issue:
Volume 5, Issue 1, February 2017
Pages:
11-18
Received:
3 January 2017
Accepted:
25 January 2017
Published:
4 March 2017
Abstract: The biosorption of Cu (II), Zn (II) and Pb (II) ions from aqueous solution onto dried biomass (Urtica dioica leaves) is discussed in the present study. The effect of variation of contact time, adsorbent dose, pH, concentration of metal ions and temperature on biosorption of metal ion is studied. Maximum adsorption was recorded for initial metal ion concentration of 10 mg/l, adsorbent dose of 2 gm, at pH 5 with 60 minutes of contact time for Lead and Zinc, 45 minutes of contact time for Copper ion. The equilibrium conditions were well described by Langmuir, Freundlich and Temkin isotherm equations. The Langmuir isotherm model have provided a better fit with the experimental data compared to that of Freundlich and Temkin isotherm models. The values of thermodynamic parameters indicate that the adsorption reactions were spontaneous, feasible and exothermic.
Abstract: The biosorption of Cu (II), Zn (II) and Pb (II) ions from aqueous solution onto dried biomass (Urtica dioica leaves) is discussed in the present study. The effect of variation of contact time, adsorbent dose, pH, concentration of metal ions and temperature on biosorption of metal ion is studied. Maximum adsorption was recorded for initial metal ion...
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