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Abstract  

Non-isothermal dehydration of copper chloride dihydrate and nickel chloride hexahydrate were studied by using TG, DTG, DTA and DSC measurements. The copper chloride salt loses its two water molecules in one step while nickel chloride salt dehydrates in three consecutive steps. The first two steps involve the loss of 4 water molecules in two overlapped steps while the third step involves the dehydration of the dihydrate salt to give the anhydrous NiCl2. Activation energies (ΔE) and the frequency factor (A) were calculated from DTG and DTA results. We have also calculated the different thermodynamic parameters, e.g. enthalpy change (ΔH), heat capacity (C p) and the entropy change (ΔS) from DSC measurements for both reactants. The isothermal rehydration of the completely dehydrated salts was studied in air and under saturated vapour pressure of water. Anhydrous nickel chloride was found to rehydrate in three consecutive steps while the copper salt rehydrated in one step.

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Abstract  

This work concerns the study of Al–Ni bimetallic nanoparticles synthesized by gamma-radiolysis of aqueous solution containing aluminium chloride hexahydrate, nickel chloride hexahydrate, polyvinyl alcohol for capping colloidal nanoparticles, and isopropanol as radical scavenger. While the Al/Ni molar ratio is kept constant, size of the nanoparticles can be well controlled by varying the radiation dose. The products were characterized by UV–vis spectroscopy, transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX), and X-ray diffraction analysis (XRD). Observations of UV–vis absorption spectra and TEM images showed that as the radiation dose increases from 50 to 100 kGy the particle size decreases and the number particles distribution increases. It may be explained due to the competition between nucleation and aggregation processes in the formation of metallic nanoparticles under irradiation. The EDX and XRD analysis confirmed directly the formation of Al–Ni bimetallic nanoparticles in form of alloy nanoparticles.

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Synthesis growth and characterization of l-valine nickel (II) chloride

A novel semiorganic nonlinear optical crystal

Journal of Thermal Analysis and Calorimetry
Authors: M. K. Sangeetha, M. Mariappan, G. Madhurambal, and S. C. Mojumdar

chloride hexahydrate was first dissolved in acetic acid. l -Valine was then added to the solution. The solution was stirred for 15 min continuously and heated for 15 min till complete dissolution of the starting materials. The prepared solution was

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·H 2 O was synthesized according to the Basset and Bedwell [ 25 ] methods. In typical synthesis, 20 mL of 0.5 M nickel chloride hexahydrate (NiCl 2 ·6H 2 O, Ajax Finechem Pty Ltd.) was added by 60 mL of saturated dipotassium hydrogen phosphate ((K 2

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