Synthesis of nickel oxalate particles in the confined internal droplets of W/O emulsions and in systems without space confinement

Sengupta, Bina; Tamboli, Chirag A.; Sengupta, Ranjan

doi:10.1016/j.cej.2011.03.009

Cited by 11 publications

(3 citation statements)

References 29 publications

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“…Anhydrous metal oxalates [46] constitute an important group of materials having significant applications in nanomaterials technology [47][48][49][50][51][52] because their controlled thermal decomposition process [53][54][55][56][57][58][59] lead to metallic or metal oxide products in the form of nanoparticles from which nanopowders possessing technologically desirable properties may be obtained. In particular, silver oxalate is a highly demanded material due to its use as a precursor for the production of silver nanoparticles which are incorporated in coatings, nanofibers, thin films, pigments, first aid bandages plastics, soaps, skin care products, and textiles.…”

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confidence: 99%

Silver Oxalate: Mechanical Properties and Extreme Negative Mechanical Phenomena

Colmenero

2019

Advcd Theory and Sims

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The crystal structure and mechanical properties of silver oxalate, Ag 2 C 2 O 4 , are determined using first-principles solid-state methods. The set of calculated mechanical properties include the bulk modulus and its pressure derivatives, the Young and shear moduli, the Poisson's Ratio and the ductility, hardness, and anisotropy indices. Silver oxalate is a highly anisotropic brittle material possessing a small bulk modulus of 9.6 GPa. It displays the negative Poisson's ratio (NPR) phenomenon, the value of the lowest NPR having a very large magnitude, −1.27. Besides, it exhibits the most extreme form of the negative linear compressibility (NLC) phenomenon found to date. Silver oxalate displays anisotropic NLC for external pressures in the range −0.1 to −2.4 GPa directed along the [010] crystallographic direction and isotropic NLC for isotropic pressures in the range −0.51 to 13.4 GPa. The lowest value of the negative compressibility, −831.9 ± 10 TPa −1 , is found for an isotropic pressure of −0.16 GPa. The absolute value of the computed lowest NLC is extremely large, about three times larger than the absolute value of the lowest NLC found so far. The NLC pressure range is also very wide, its width being more than two times the largest range found to date.

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confidence: 99%

Silver Oxalate: Mechanical Properties and Extreme Negative Mechanical Phenomena

Colmenero

2019

Advcd Theory and Sims

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“…[1][2][3][4][5][6] This typical process inspires researchers to employ ELM as reaction media for particle synthesis, i.e., employ the internal water droplets as micro reactors. Such facile and mild method has already been utilized to prepare various materials such as oxalate, [7][8][9] oxide, [10][11][12] cadmium sulfide, [13] phosphate, [14,15] calcium carbonate, [16,17] sulfate [14] and composites. [18][19][20][21] Morphology and size of the particles could be controlled through changing carrier concentration or water-oil ratio for controlling mass transfer rate.…”

Section: Introductionmentioning

confidence: 99%

Formation Mechanism of Zinc Oxalate Particles in the Internal Aqueous Droplets of Emulsion Liquid Membrane

Zhao

Zhang

et al. 2014

Journal of Dispersion Science and Technology

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We have investigated the formation and evolution of zinc oxalate particles in internal aqueous droplets and their effects of emulsion interface properties. The formation of particles follows an aggregation-controlled mechanism that depends on the size of droplets and surfactant. The size of droplets determines the final shape of the particles by affecting the supersaturation ratio to form rod-like and sheet-like particles. The surfactant adsorbed on the particles changes the wettability, leading to the aggregation of the primary particles at the internal water-oil interface. Moreover, the adsorption can cause a higher level of impurity and defects in as-synthesized particles. This effect could be directly employed to fabricate heterojunction rectifier.

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“…[19][20][21] Sengupta et al have synthesized nickel oxalate particles in confined internal aqueous phase droplets of water in oil (W/O) emulsions using the emulsion liquid membrane (ELM) system, with D2EHPA {bis(2-ethylhexyl phosphoric acid)} as the carrier and oxalic acid solution as the precipitating agent. 22 Nickel oxalate particles were prepared by mixing aqueous solutions of nickel sulfate and oxalic acid at 25 and 85 °C by Haq and Haider in 2010. 23 Morphology-and size-controlled nickel powders were synthesized via the thermal decomposition of nickel oxalate, which was prepared by mixing a solution containing nickel chloride hexahydrate (NiCl 2 •6H 2 O) and aqueous ammonia (NH 3 •H 2 O) with a solution of sodium oxalate (Na 2 C 2 O 4 ) under controlled conditions.…”

Section: Introductionmentioning

confidence: 99%

Anion effect on the control of morphology for NiC2O4·2H2O nanostructures as precursors for synthesis of Ni(OH)2 and NiO nanostructures and their application for removing heavy metal ions of cadmium(ii) and lead(ii)

Behnoudnia

Dehghani

2014

Dalton Trans.

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In this work, one-dimensional (1-D) and three-dimensional (3-D) nickel oxalate dihydrate nanostructures have been selectively prepared by a one-step and surfactant-free solvothermal approach. This preparation procedure can control the product morphology by varying the reaction temperature and anions such as nitrates, acetates, chlorides and sulfates. The morphology of nickel oxalate dihydrate changed from non-uniform sheets and ribbons to nanorods with higher temperatures while changing the initial anion converted nanorods to dandelion-like nanostructures. Field emission scanning electron microscopy (FESEM) shows that the sizes of the nickel oxalate dihydrate nanorods are about 3 μm in length and the dandelion-like nanostructures have an average diameter of around 10 μm. Furthermore, the adsorption of the heavy metal ions of cadmium(ii) and lead(ii) with nanostructured nickel compounds was investigated. The results indicate the NiO and Ni(OH)2 nanostructures can effectively adsorb cadmium(ii) and lead(ii) ions from aqueous solution.

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Synthesis of nickel oxalate particles in the confined internal droplets of W/O emulsions and in systems without space confinement

Cited by 11 publications

References 29 publications

Silver Oxalate: Mechanical Properties and Extreme Negative Mechanical Phenomena

Silver Oxalate: Mechanical Properties and Extreme Negative Mechanical Phenomena

Formation Mechanism of Zinc Oxalate Particles in the Internal Aqueous Droplets of Emulsion Liquid Membrane

Anion effect on the control of morphology for NiC2O4·2H2O nanostructures as precursors for synthesis of Ni(OH)2 and NiO nanostructures and their application for removing heavy metal ions of cadmium(ii) and lead(ii)

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