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J R Dahn - One of the best experts on this subject based on the ideXlab platform.

  • o2 structure li2 3 ni1 3mn2 3 o 2 a new layered cathode material for rechargeable lithium batteries iii ion exchange
    Journal of The Electrochemical Society, 2000
    Co-Authors: J M Paulsen, D Larcher, J R Dahn
    Abstract:

    The ion exchange of Li for Na in P2‐structure to make T2‐structure is studied. Electron micrographs show that the hexagonal Plate‐Like Crystal habit is preserved during ion exchange. Ion exchange is successful and equivalent using both molten salts and concentrated aqueous solutions. By controlling the Li:Na ratio in the ion exchange, it is possible to prepare an intermediate phase of approximate composition , where filled alkali layers of Li and Na alternate, thus doubling the c axis of the material. A summary of ion‐exchange reactions of Li for Na in other layered Na‐bronzes, such as , , , , , , , , , and , is given. © 2000 The Electrochemical Society. All rights reserved.

J M Paulsen - One of the best experts on this subject based on the ideXlab platform.

  • o2 structure li2 3 ni1 3mn2 3 o 2 a new layered cathode material for rechargeable lithium batteries iii ion exchange
    Journal of The Electrochemical Society, 2000
    Co-Authors: J M Paulsen, D Larcher, J R Dahn
    Abstract:

    The ion exchange of Li for Na in P2‐structure to make T2‐structure is studied. Electron micrographs show that the hexagonal Plate‐Like Crystal habit is preserved during ion exchange. Ion exchange is successful and equivalent using both molten salts and concentrated aqueous solutions. By controlling the Li:Na ratio in the ion exchange, it is possible to prepare an intermediate phase of approximate composition , where filled alkali layers of Li and Na alternate, thus doubling the c axis of the material. A summary of ion‐exchange reactions of Li for Na in other layered Na‐bronzes, such as , , , , , , , , , and , is given. © 2000 The Electrochemical Society. All rights reserved.

D Larcher - One of the best experts on this subject based on the ideXlab platform.

  • o2 structure li2 3 ni1 3mn2 3 o 2 a new layered cathode material for rechargeable lithium batteries iii ion exchange
    Journal of The Electrochemical Society, 2000
    Co-Authors: J M Paulsen, D Larcher, J R Dahn
    Abstract:

    The ion exchange of Li for Na in P2‐structure to make T2‐structure is studied. Electron micrographs show that the hexagonal Plate‐Like Crystal habit is preserved during ion exchange. Ion exchange is successful and equivalent using both molten salts and concentrated aqueous solutions. By controlling the Li:Na ratio in the ion exchange, it is possible to prepare an intermediate phase of approximate composition , where filled alkali layers of Li and Na alternate, thus doubling the c axis of the material. A summary of ion‐exchange reactions of Li for Na in other layered Na‐bronzes, such as , , , , , , , , , and , is given. © 2000 The Electrochemical Society. All rights reserved.

Stephen W Hoag - One of the best experts on this subject based on the ideXlab platform.

  • elucidating the variability of magnesium stearate and the correlations with its spectroscopic features
    Journal of Pharmaceutical Sciences, 2019
    Co-Authors: Ting Wang, Alan R Potts, Stephen W Hoag
    Abstract:

    Abstract The objective of this study is to investigate the variability in physiochemical and spectral properties of commercially available vegetable-grade magnesium stearate (MgSt) samples and to assess the correlation between physiochemical properties and near-infrared and Raman spectroscopic features to determine if fast spectral measurements could be used for physical and chemical evaluation. Thirteen MgSt samples of 9 manufacturer grades were obtained from 3 suppliers. The chemical composition was examined using gas chromatography and loss on drying. The physical characteristics were examined on 3 levels: solid state, particle, and bulk level. Comparing the largest to the smallest test values of 13 samples, the variation of the properties ranged from 7% to 335%, with majority of them varying by more than 100% of the smallest value. The samples could be categorized into 4 groups based on solid state properties (1) monohydrate, (2) dihydrate, (3) mixture of monohydrate and dihydrate, and (4) anhydrous form. Scanning electron microscopy images revealed 2 morphological types: thin, flat, and Plate-Like Crystal habit versus irregular Crystal habit. The overall variability was mapped using Principal Component Analysis. The greatest variation was due to different manufacturers and perhaps manufacturing methods and starting materials. Based on correlations to physiochemical properties of MgSt, near-infrared and Raman spectra showed potential as a rapid technique for evaluating the differences in excipient properties.

Maha F. Tutunji - One of the best experts on this subject based on the ideXlab platform.

  • sorption of lead ions on diatomite and manganese oxides modified diatomite
    Water Research, 2001
    Co-Authors: Yahya S Aldegs, Majeda Khraisheh, Maha F. Tutunji
    Abstract:

    Naturally occurring diatomaceous earth (diatomite) has been tested as a potential sorbent for Pb(II) ions. The intrinsic exchange properties were further improved by modification with manganese oxides. Modified adsorbent (referred to as Mn-diatomite) showed a higher tendency for adsorbing lead ions from solution at pH 4. The high performance exhibited by Mn-diatomite was attributed to increased surface area and higher negative surface charge after modification. Scanning electron microscope pictures revealed a birnessite structure of manganese oxides, which was featured by a Plate-Like-Crystal structure. Diatomite filtration quality was improved after modification by manganese oxides. Good filtration qualities combined with high exchange capacity emphasised the potential use of Mn-diatomite in filtration systems.