Preparation and thermal stability of manganese oxides obtained by precipitation from aqueous manganese sulphate solution

Pattanayak, J.; Rao, V. Sitakara; Maiti, Himadri Sekhar

doi:10.1016/0040-6031(89)85433-4

Cited by 17 publications

(3 citation statements)

References 7 publications

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“…These contradictions in the reversibility results of the Mn 2 O 3 /Mn 3 O 4 redox couple could rely on the role that the synthesis routes and, consequently, the physical properties of the obtained materials play on their chemical activity. In this respect, the oxidation behaviour of Mn 3 O 4 has been proved to be inuenced by preparation conditions like pH, 15 milling time, 16 or properties like particle size [17][18][19] and surface area, 20 which are modied by variations on the annealing temperature. Likewise, Zhao et al 21,22 found a relationship between the processing parameters and the particle size, surface area and morphology of manganese oxides synthesized by precipitation with ammonia, indicating the possibility of tailoring the material properties by performing the precipitation with different precursor solution concentrations.…”

Section: Introductionmentioning

confidence: 99%

Thermochemical heat storage based on the Mn₂O₃/Mn₃O₄redox couple: influence of the initial particle size on the morphological evolution and cyclability

et al. 2014

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Thermochemical energy storage (TCS) based on reduction-oxidation cycles of multivalent metal oxides is of great interest for concentrating solar facilities, as it can allow enhancing the global plant efficiency and improving the energy generation dispatchability. However, to guarantee the feasibility of the process, selected materials should present long term durability, which requires the evaluation of the redox couple cyclability. In this work we have demonstrated, for the first time, the suitability of the Mn 2 O 3 /Mn 3 O 4 pair for this application during 30 cycles, performed in thermobalance. Nevertheless, an appropriate design of such materials is crucial since it has been found that initial particle size influences the redox behaviour of these oxides. Results showed a 2-fold influence of particle size of the as-prepared materials on the redox reversibility. Firstly, this parameter affects to the thermodynamics and kinetics of the redox reactions. Namely a decrease of the particle size shifted the oxidation temperature to lower values and produced slower reduction and oxidation reactions. Secondly, depending on the particles size, samples followed different sintering mechanisms. This fact influenced dramatically the behaviour of the materials with lower particle size, which suffered from a higher degree of densification that eventually caused a total loss of cyclability. † Electronic supplementary information (ESI) available: XRD patterns; high resolution TEM micrographs; SEM micrographs, rst cooling step interval; DSC curves for M 1 sample. See

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Section: Introductionmentioning

confidence: 99%

Thermochemical heat storage based on the Mn₂O₃/Mn₃O₄redox couple: influence of the initial particle size on the morphological evolution and cyclability

et al. 2014

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“…According to the literature on Mn-doped glasses [43], the weight increase can be attributed to transformations of manganese oxides (and possibly hydroxides) due to oxidations in air. In particular, conversion of Mn 3 O 4 to α-Mn 2 O 3 was identified, with weight gain, by Pattanayak et al [44]. It is, in fact, reported that such increases do not occur when samples are thermally treated under N 2 .…”

Section: Tg-dtamentioning

confidence: 96%

Mn-Containing Bioactive Glass-Ceramics: BMP-2-Mimetic Peptide Covalent Grafting Boosts Human-Osteoblast Proliferation and Mineral Deposition

et al. 2022

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The addition of Mn in bioceramic formulation is gaining interest in the field of bone implants. Mn activates human osteoblast (h-osteoblast) integrins, enhancing cell proliferation with a dose-dependent effect, whereas Mn-enriched glasses induce inhibition of Gram-negative or Gram-positive bacteria and fungi. In an effort to further optimize Mn-containing scaffolds’ beneficial interaction with h-osteoblasts, a selective and specific covalent functionalization with a bioactive peptide was carried out. The anchoring of a peptide, mapped on the BMP-2 wrist epitope, to the scaffold was performed by a reaction between an aldehyde group of the peptide and the aminic groups of silanized Mn-containing bioceramic. SEM-EDX, FT-IR, and Raman studies confirmed the presence of the peptide grafted onto the scaffold. In in vitro assays, a significant improvement in h-osteoblast proliferation, gene expression, and calcium salt deposition after 7 days was detected in the functionalized Mn-containing bioceramic compared to the controls.

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“…While the loss of mass in the second-third-forth stages are complicated to identify, the residual mass of 18.624% at 300-500 0 C seems to be due to α-Mn 2 O 3 (ca. 18.664%) 17 , leading to Mn content of 6.96% (ca. 6.50%).…”

Section: Conductance Aas Tga-dta and Chemical Formulamentioning

confidence: 99%

Structural Analysis of Powdered Manganese(II) of 1,10-Phenanthroline (phen) as Ligand and Trifluoroacetate (TFA) as Counter Anion

Sugiyarto¹,

Kusumawardani²,

Sutrisno³

et al. 2018

Orient. J. Chem

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The complex containing manganese(II), 1,10-phenanthroline (phen) as ligand and trifluoroacetate (TFA) as counter anion has been prepared and characterized. The electrical equivalent conductance, metal content, and TGA-DTA analysis suggests the complex to be [Mn(phen) 3 ](TFA) 2 .1.35H 2 O. The magnetic moment was found to be normal high-spin paramagnetic for 5 unpaired electrons in the electron configuration of manganese(II). The electronic spectral bands indicates the five posible spin-forbidden transitions of sextet ground state to quartet excited states. The IR spectral data signify the mode of vibrations typical for phenanthroline as well as TFA, while the images of SEM-EDX photographs confirm the existence of the coresponding elemental content, they reflect high crystalinity of the complex as evidence of the sharp peaks of the corresponding powdered diffractogram. The analysis of powder XRD refined by Le Bail program was found to be structurally triclinic symmetry of P Ι for the cationic complex with the cell

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Preparation and thermal stability of manganese oxides obtained by precipitation from aqueous manganese sulphate solution

Cited by 17 publications

References 7 publications

Thermochemical heat storage based on the Mn₂O₃/Mn₃O₄redox couple: influence of the initial particle size on the morphological evolution and cyclability

Thermochemical heat storage based on the Mn₂O₃/Mn₃O₄redox couple: influence of the initial particle size on the morphological evolution and cyclability

Mn-Containing Bioactive Glass-Ceramics: BMP-2-Mimetic Peptide Covalent Grafting Boosts Human-Osteoblast Proliferation and Mineral Deposition

Structural Analysis of Powdered Manganese(II) of 1,10-Phenanthroline (phen) as Ligand and Trifluoroacetate (TFA) as Counter Anion

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Preparation and thermal stability of manganese oxides obtained by precipitation from aqueous manganese sulphate solution

Cited by 17 publications

References 7 publications

Thermochemical heat storage based on the Mn2O3/Mn3O4redox couple: influence of the initial particle size on the morphological evolution and cyclability

Thermochemical heat storage based on the Mn2O3/Mn3O4redox couple: influence of the initial particle size on the morphological evolution and cyclability

Mn-Containing Bioactive Glass-Ceramics: BMP-2-Mimetic Peptide Covalent Grafting Boosts Human-Osteoblast Proliferation and Mineral Deposition

Structural Analysis of Powdered Manganese(II) of 1,10-Phenanthroline (phen) as Ligand and Trifluoroacetate (TFA) as Counter Anion

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Thermochemical heat storage based on the Mn₂O₃/Mn₃O₄redox couple: influence of the initial particle size on the morphological evolution and cyclability

Thermochemical heat storage based on the Mn₂O₃/Mn₃O₄redox couple: influence of the initial particle size on the morphological evolution and cyclability