Morphology of heavy ions irradiated mica

Singh, Mohan; Kaur, Navjeet; Singh, Lakhwant

doi:10.1016/j.radphyschem.2010.07.014

Cited by 16 publications

(8 citation statements)

References 85 publications

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“…These attractive chemical and physical properties make mica a favored material for radio frequency capacitors, high voltage electrical insulators, solid lubrication for nanoscale friction, and atomically flat substrates [8][9][10][11]. The crystal structure imparts mica with perfect basal cleavage [12].…”

Section: Introductionmentioning

confidence: 99%

Layer-by-layer removal of insulating few-layer mica flakes for asymmetric ultra-thin nanopore fabrication

et al. 2011

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We demonstrate an elaborate method to controllably fabricate ultra-thin nanopores by layer-by-layer removal of insulating few-layer mica flakes with atomic force microscopy (AFM). The fabricated nanopores are geometrically asymmetric, like an inverted quadrangular frustum pyramid. The nanopore geometry can be engineered by finely tuning the mechanical load on the AFM tip and the scanning area. Particularly noteworthy is that the nanopores can also be fabricated in suspended few-layer mica membranes on a silicon window, and may find potential use as functional components in nanofluidic devices.

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Section: Introductionmentioning

confidence: 99%

Layer-by-layer removal of insulating few-layer mica flakes for asymmetric ultra-thin nanopore fabrication

et al. 2011

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“…Thus, it is difficult to induce obvious variation in macro morphology in theory. Even under 197 Au (11.4 MeV n −1 ) ion irradiation for several minutes, which has an intense LET effect, variation in the z -direction is several nanometre for muscovite [7]. For γ -ray irradiation, for a weak LET effect, the variation would be smaller.…”

Section: Resultsmentioning

confidence: 99%

Intensive study on structure transformation of muscovite single crystal under high-doseγ-ray irradiation and mechanism speculation

et al. 2019

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Intensive study on structure transformation of muscovite single crystal under high-dose γ -ray irradiation is essential for its use in irradiation detection and also beneficial for mechanism cognition on defect formation within a matrix of clay used in the disposal of high-level radioactive waste (HLRW). In this work, muscovite single crystal was irradiated with Co-60 γ ray in air at a dose rate of 54 Gy min −1 with doses of 0–1000 kGy. Then, structure transformation and mechanism were explored by Raman spectrum, Fourier-transform infrared spectrum, X-ray diffraction, thermogravimetric analysis, CA, scanning electron microscope and atomic force microscopy. The main results show that variations in the chemical/crystalline structure are dose-dependent. Low-dose irradiation sufficiently destroyed the structure, removing Si–OH, thus declining hydrophilicity. With dose increase up to 100 kGy, CA increased from 20° to 40°. Except for hydrophilicity variation, shrink occurred in the (004) lattice plane which later recovered; the variation range at 500 kGy irradiation was 0.5% close to 0.02 Å. The main mechanisms involved were framework break and H 2 O radiolysis. Framework break results in Si–OH removal and H 2 O radiolysis results in extra OH introduction. The extra introduced OH probably results in Si–OH bond regeneration, lattice plane shrink and recovered surface hydrophilicity. The importance of framework break and H 2 O radiolysis on structure transformation is dose-dependence. At low doses, framework break seems more important while at high doses H 2 O radiolysis is important. Generally, variations in the chemical structure and surface property are nonlinear and less at high doses. This indicates using the chemical structure or surface property variation to describe irradiation is correct at low doses but not at high doses. This finding is meaningful for realizing whether muscovite is suitable for detecting high-dose irradiation or not, and mechanism exploration is efficient for identifying the procedure for defect formation within the matrix of clay used in disposal HLRW in practice.

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“…Even under 197 Au (14.0 MeV/n) ion irradiation for 30 s, the defect along the z direction for muscovite is several nanometers. 65 For g-ray irradiation, the variation would be smaller, which would even exceed the resolution of AFM technology. Therefore, this procedure for roughness variation was not certied.…”

Section: Surface Hydrophilicity and Morphologymentioning

confidence: 99%

Intensive evaluation of radiation stability of phlogopite single crystals under high doses of γ-ray irradiation

et al. 2019

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Morphology of heavy ions irradiated mica

Cited by 16 publications

References 85 publications

Layer-by-layer removal of insulating few-layer mica flakes for asymmetric ultra-thin nanopore fabrication

Layer-by-layer removal of insulating few-layer mica flakes for asymmetric ultra-thin nanopore fabrication

Intensive study on structure transformation of muscovite single crystal under high-doseγ-ray irradiation and mechanism speculation

Intensive evaluation of radiation stability of phlogopite single crystals under high doses of γ-ray irradiation

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