Positronium in high temperature phases of long-chain even n-alkanes

Goworek, T.; Pietrow, M.; Zaleski, R.; Zgardzińska, B.

doi:10.1016/j.chemphys.2008.11.019

Cited by 14 publications

(9 citation statements)

References 27 publications

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“…The intensity values of PALS components were successfully applied to follow concentration of the free radicals and trapped electrons in the organic materials [18][19][20]. It has already been shown that illumination of a sample influences the shape of the lifetime spectrum by changing the concentration of free radicals [21][22][23]. Such results justify an expectation of PALS applicability to free radicals investigations in biological systems.…”

Section: Introductionsupporting

confidence: 50%

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Human Tissue Investigations Using PALS Technique - Free Radicals Influence

et al. 2017

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The positron annihilation lifetime spectroscopy was applied to the samples of the human uterine leiomyomas and the normal myometrium tissues taken from the selected place of the uterus during a surgery. The method indicated differences in values of the measured positron annihilation lifetime spectroscopy parameters (lifetimes and intensities) between healthy and diseased tissue samples. The additional measurements were performed either in darkness or in presence of visible light which influenced the free radicals present in both kind of tissues and, as a result, made changes in free annihilation and o-Ps decay lifetime and intensity values.

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Section: Introductionsupporting

confidence: 50%

“…• C) in less than 1 h. In our laboratory, a 22 Na source (of the activity 0.7 MBq) was placed inside the Plexiglas partition and inserted between two slices of investigated sample. Each sample was measured for 1.5 h using a standard fast-slow PALS spectrometer.…”

Section: Methodsmentioning

confidence: 99%

Human Tissue Investigations Using PALS Technique - Free Radicals Influence

et al. 2017

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“…2. The δ values were calculated for a group of long chain alkanes intensively investigated for the last few years [18][19][20]. From the data presented in the figure one can conclude that up to the phase transition the alkanes porosity, as defined by the δ indicator, is almost constant while in a rotator phase (dashed area) it rises more than twice.…”

Section: Applications To Materials Sciencementioning

confidence: 88%

New Porosimetric Method Based on the 3γ Annihilation Rate. Applications to Materials Science and Medical Imaging

Jasińska

Zgardzińska

2017

Acta Phys. Pol. A

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A new parameter δ based on 3γ annihilation is proposed. It describes the porosity of the materials containing small intermolecular voids below 1 nm. It can be applied to material investigation to compare changes in the material porosity depending on temperature or pressure as well as to study of ageing or manufacturing processes. Particularly it is dedicated to prepare the new imaging method and can be used during positron emission tomography diagnosis allowing determination the kind or stage of pathogenic alteration.

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“…Alkanes and their mixtures are widely distributed in the natural environment; they are the main constituents of oil, lubricants, they appear as the building components of lipids, surfactants and liquid crystals. So far they have been the object of numerous studies by X-ray diffraction [1][2][3][4], DSC [1,[5][6][7], infrared and Raman spectroscopy [1,8,9], neutron scattering [10], positron annihilation [11][12][13][14][15] etc. If n < 25, only two solid phases of these compounds are observed: a rigid crystal and a waxy rotator phase.…”

Section: Alkanesmentioning

confidence: 99%