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Separation of Ga(III) from Cu(II), Ni(II) and Zn(II) in aqueous solution using synthetic polymeric resins

100%

Massaoud A., Hanafi H., Siyam T., Saleh Z., Ali F.

Open Chemistry

2008

vol. 6

issue 1

39-45

Poly (acrylamide-acrylic acid-dimethylaminoethylmethacrylate), p(AM-AA-DMAEM) and Poly(acrylamide-acrylic acid)-ethylenediaminetetracetic acid disodium, p(AM-AA)-EDTANa2 were prepared by gamma radiation-induced template polymerization technique and used for the separation of Ga (III) from Cu (II), Ni (II), and Zn (II) in aqueous media. The effect of pH and contact time on the separation process was studied. The optimum pH value for the separation process is 3–3.5. The result shows that Ga (III) is first extracted while Cu (II), Ni (II) and Zn(II) are slightly extracted at this pH value. The recovery of metals using HCl, HNO3 and H2SO4 has been studied. The resins may be regenerated using 2M HCl solutions. [...]

Inverse Hall-Petch Like Mechanical Behaviour in Nanophase Al-Cu-Fe Quasicrystals: A New Phenomenon

73%

Mukhopadhyay N., Ali F., Scudino S., Samadi Khoshkhoo M., Stoica M., Srivastava V., Uhlenwinkel V., Vaughan G., Suryanarayana C., Eckert J.

Acta Physica Polonica A

2014

vol. 126

issue 2

543-548

The structural and mechanical stability of quasicrystals are important issues due to their potential for possible applications at high temperatures and stresses. The aim of the present work is, therefore, to review the earlier works on conventional crystalline and quasicrystalline materials and also to report the results and the analysis on the Hall-Petch and inverse Hall-Petch like behavior of nanoquasicrystalline Al_{62.5}Cu_{25}Fe_{12.5} alloys. It was observed that, at large grain sizes, the hardness increases with decreasing grain size, exhibiting the conventional Hall-Petch relationship, whereas for smaller grains, inverse Hall-Petch behavior was identified. The inverse Hall-Petch behavior in the nanoquasicrystalline phase could be attributed to thermally activated shearing of the grain boundaries, leading to grain boundary sliding in nanostructures of quasicrystalline grains. These results were analyzed based on the dislocation pile-up model as well as the grain boundary shearing models applicable to nanomaterials.

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1 Acta Physica Polonica A

1 Open Chemistry

1 2014

1 2008

2 Ali F.

1 Eckert J.

1 Hanafi H.

1 Massaoud A.

1 Mukhopadhyay N.

1 Saleh Z.

1 Samadi Khoshkhoo M.

1 Scudino S.

1 Siyam T.

1 Srivastava V.

1 Stoica M.

1 Suryanarayana C.

1 Uhlenwinkel V.

1 Vaughan G.

Search results

Separation of Ga(III) from Cu(II), Ni(II) and Zn(II) in aqueous solution using synthetic polymeric resins

Inverse Hall-Petch Like Mechanical Behaviour in Nanophase Al-Cu-Fe Quasicrystals: A New Phenomenon