Enhancement of γ-radiation stability of polysulfone membrane matrix by reinforcement of hybrid nanomaterials of nanodiamond and ceria

Bedar, Amita; Lenka, R.K.; Goel, Narendra S.; Kumar, Sanjay; Jain, Ratnesh; Singh, Beena G.; Tewari, P.K.; Bindal, R.C.; Kar, Soumitra

doi:10.1039/d0ma00169d

Cited by 6 publications

(3 citation statements)

References 47 publications

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“…In detail, Equations ()–() describe surface adsorbed O 2 /H 2 O radiolysis and evaporation 47,55,56 . Equation () describes tetrahedral sheet destruction, generating defects and micro‐holes, reducing surface wettability.…”

Section: Resultsmentioning

confidence: 99%

“…In detail, Equations ( 1)-( 3) describe surface adsorbed O 2 /H 2 O radiolysis and evaporation. 47,55,56 Equation (4) describes tetrahedral sheet destruction, generating defects and micro-holes, reducing surface wettability. Equation ( 5) describes an interface cleavage of tetrahedron and octahedron, inducing collapse, reducing lattice size.…”

Section: H (O) ⋅ or 𝑒 Movementioning

confidence: 99%

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An exploration of lattice transformation mechanism of muscovite single crystal under EB irradiation at 0–1000 kGy

Wang,

Sun,

Xia

et al. 2023

J Am Ceram Soc.

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Electronic components made by inorganics (e.g., mica) play key roles in function exertion of instruments working in outer‐layer space, enduring long‐term β ray irradiation. Its damage is vital while explored rarely. Herein, pure muscovite crystals were chosen and irradiated by an electron beam (EB) in air with dose up to 1000 kGy. Then, micro‐geometry morphology variation in Z‐axis and microstructural transformation mechanism were explored by XRD, FT‐ATR IR, TGA, XPS and CA analysis. Main results reveal that muscovite lattice is unstable to EB irradiation. With dose increases to 1000 kGy interlayer space d of (002) lattice varied 2% near 0.2 Å. At low dose irradiation lattice expansion is readily to occur while at higher dose it is lattice shrinkage, showing a transformation from expansion to shrinkage. Concurrently, chemical structure varied, H2O amount increased, metal element valance and surface wettability were reduced. Where, dehydroxylation occurred exceeding H2O radiaolysis and evaporation, and framework cleavage be severe. Binding energies of metals of 1000 kGy‐irradiated species decreased by 0.2 eV, CA of 100 kGy‐irradiated species increased by 10°. Intrinsic mechanisms involve framework destruction, H‐atom migration, hydrogen bond formation/destruction and H2O radiolysis. At low dose irradiation, H‐atom migration and hydrogen bond formation/destruction are predominant, inducing lattice expansion; at higher dose, framework cleavage is intensive and crucial, inducing shrinkage. During which, partial H2O occurred radiolysis, reducing valence. Generally, H‐atom migration and interface cleavage played key roles in microgeometry morphology variation of muscovite crystal under EB irradiation at 0–1000 kGy. To enhance muscovite geometry morphology‐stability under a long‐term β‐ray irradiation condition OH and hydrogen bond contents should be reduced and interface region should be strengthened (e.g., lessening vacancies or compacting stacking). This conclusion promotes design of radiation‐resistant silicate material, guiding manufacture of electronic component used in aerospace industry, significant.This article is protected by copyright. All rights reserved

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Section: Resultsmentioning

confidence: 99%

Section: H (O) ⋅ or 𝑒 Movementioning

confidence: 99%

An exploration of lattice transformation mechanism of muscovite single crystal under EB irradiation at 0–1000 kGy

Wang,

Sun,

Xia

et al. 2023

J Am Ceram Soc.

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“…Membranes with a CND fraction of 0.5% wt. withstood doses an order of magnitude higher (1000 kGy) [87], as the diamond particles adsorbed chemically aggressive products of water radiolysis [88]. The prospects for using diamonds to increase the thermal and radiation resistance and service life of filtration polymer membranes were discussed in review [89], in connection with the problems of modifying the surface of diamonds.…”

Section: Micellar Models For Membranesmentioning

confidence: 99%

Electrochemical Properties and Structure of Membranes from Perfluorinated Copolymers Modified with Nanodiamonds

Lebedev,

Kulvelis,

Shvidchenko

et al. 2023

Membranes

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In this study, we aimed to design and research proton-conducting membranes based on Aquivion®-type material that had been modified with detonation nanodiamonds (particle size 4–5 nm, 0.25–5.0 wt. %). These nanodiamonds carried different functional groups (H, OH, COOH, F) that provided the hydrophilicity of the diamond surface with positive or negative potential, or that strengthened the hydrophobicity of the diamonds. These variations in diamond properties allowed us to find ways to improve the composite structure so as to achieve better ion conductivity. For this purpose, we prepared three series of membrane films by first casting solutions of perfluorinated Aquivion®-type copolymers with short side chains mixed with diamonds dispersed on solid substrates. Then, we removed the solvent and the membranes were structurally stabilized during thermal treatment and transformed into their final form with –SO3H ionic groups. We found that the diamonds with a hydrogen-saturated surface, with a positive charge in aqueous media, contributed to the increase in proton conductivity of membranes to a greater rate. Meanwhile, a more developed conducting diamond-copolymer interface was formed due to electrostatic attraction to the sulfonic acid groups of the copolymer than in the case of diamonds grafted with negatively charged carboxyls, similar to sulfonic groups of the copolymer. The modification of membranes with fluorinated diamonds led to a 5-fold decrease in the conductivity of the composite, even when only a fraction of diamonds of 1 wt. % were used, which was explained by the disruption in the connectivity of ion channels during the interaction of such diamonds mainly with fluorocarbon chains of the copolymer. We discussed the specifics of the mechanism of conductivity in composites with various diamonds in connection with structural data obtained in neutron scattering experiments on dry membranes, as well as ideas about the formation of cylindrical micelles with central ion channels and shells composed of hydrophobic copolymer chains. Finally, the characteristics of the network of ion channels in the composites were found depending on the type and amount of introduced diamonds, and correlations between the structure and conductivity of the membranes were established.

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A study on the effects of thermal treatments and gamma rays irradiation on expired “Helixone” membranes

2023

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Enhancement of γ-radiation stability of polysulfone membrane matrix by reinforcement of hybrid nanomaterials of nanodiamond and ceria

Abstract: A hybrid nanoparticle system of nanodiamond and cerium oxide (ceria) is used as a reinforcement material in order to enhance the γ-radiation stability of polysulfone host membrane matrix.

Cited by 6 publications

References 47 publications

An exploration of lattice transformation mechanism of muscovite single crystal under EB irradiation at 0–1000 kGy

An exploration of lattice transformation mechanism of muscovite single crystal under EB irradiation at 0–1000 kGy

Electrochemical Properties and Structure of Membranes from Perfluorinated Copolymers Modified with Nanodiamonds

A study on the effects of thermal treatments and gamma rays irradiation on expired “Helixone” membranes

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