Mechanochemical Synthesis of Sodium Thiosulphate Pentahydrate

<div> Fast-ion conductors are critical to the development of solid-state batteries. The effects of mechanochemical synthesis that lead to increased ionic conductivity in an archetypical sodium-ion conductor Na3PS4 are not fully understood. We present here a comprehensive analysis based on diffraction (Bragg, pair distribution function), spectroscopy (impedance, Raman, NMR, INS) and ab-initio simulations aimed at elucidating the synthesis-property relationships in Na3PS4. We consolidate previously reported interpretations about the local structure of ball-milled samples, underlining the sodium disorder and showing that a local tetragonal framework more accurately describes the structure than the originally proposed cubic one. Through variable-pressure impedance spectroscopy measurements, we report for the first time the activation volume for Na+ migration in Na3PS4, which is ~30% higher for the ball-milled samples. Moreover, we show that the effect of ball-milling on increasing the ionic conductivity of Na3PS4 to ~10-4 S/cm can be reproduced by applying external pressure on a sample from conventional high temperature ceramic synthesis. We conclude that the key effects of mechanochemical synthesis on the properties of solid electrolytes can be analyzed and understood in terms of pressure, strain and activation volume. </div>

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Theoretical and Experimental Evaluation of the Effect of Fluorinated Substituent on the Topological Landscape and Thermodynamic Stability of Zeolitic Imidazolate Framework Polymorphs

10.26434/chemrxiv.7072577.v1 ◽

2018 ◽

Author(s):

Mihails Arhangelskis ◽

Athanassis Katsenis ◽

Novendra Novendra ◽

Zamirbek Akimbekov ◽

Dayaker Gandrath ◽

...

Keyword(s):

Density Functional Theory ◽

Mechanochemical Synthesis ◽

Thermodynamic Stability ◽

Experimental Evaluation ◽

Density Functional ◽

Theoretical Calculations ◽

Zeolitic Imidazolate Framework ◽

Functional Theory ◽

Calorimetric Measurements ◽

And Calorimetry

By combining mechanochemical synthesis and calorimetry with theoretical calculations, we demonstrate that dispersion-corrected periodic density functional theory (DFT) can accurately survey the topological landscape and predict relative energies of polymorphs for a previously inaccessible fluorine-substituted zeolitic imidazolate framework (ZIF). Experimental screening confirmed two out of three theoretically anticipated polymorphs, and the calorimetric measurements provided an excellent match to theoretically calculated energetic difference between them.

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Sodium thiosulphate hydrated photographic grade.

10.3403/30308350 ◽

1960 ◽

Keyword(s):

Sodium Thiosulphate

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Fast Mechanochemical Synthesis of Nano-structured PMN at Low Temperature

Journal of Inorganic Materials ◽

10.3724/sp.j.1077.2010.00541 ◽

2010 ◽

Vol 25 (5) ◽

pp. 541-545 ◽

Cited By ~ 1

Author(s):

Hao WU ◽

Cheng CHEN ◽

Dan-Yu JIANG ◽

Qiang LI

Keyword(s):

Low Temperature ◽

Mechanochemical Synthesis

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Viral inactivation by potassium ferrate

Water Science & Technology ◽

10.2166/wst.1995.0591 ◽

1995 ◽

Vol 31 (5-6) ◽

pp. 165-168 ◽

Cited By ~ 10

Author(s):

Futaba Kazama

Keyword(s):

Phosphate Buffer ◽

Potassium Ferrate ◽

Sodium Thiosulphate ◽

Viral Inactivation ◽

Complete Decomposition ◽

Kinetics Of ◽

Oxidative Intermediate

The kinetics of inactivation by potassium ferrate were studied using a bacteriophage, F-specific RNA-coliphage Qβ as a viral model. The inactivation appeared to be expressed by Hom's model in phosphate buffer at pH 6, 7, and 8. The rate of inactivation depended on pH; the lower pH, the faster inactivation observed. To consider the mechanism by which ferrate caused inactivation, the efficiency of inactivation was checked after ferrate decomposition in buffer. Effective inactivation following Hom's model was also observed after the complete decomposition of ferrate ion; however, the efficiency of that inactivation disappeared by the addition of sodium thiosulphate, suggesting that rather long-lived oxidative intermediate was generated by the decomposition of ferrate ion. The intermediate might take part in the inactivation.

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