Porosity characterization of aerogels using positron annihilation lifetime spectroscopy
β Scribed by I. Mincov; M.P. Petkov; P. Tsou; T. Troev
- Book ID
- 116667934
- Publisher
- Elsevier Science
- Year
- 2004
- Tongue
- English
- Weight
- 326 KB
- Volume
- 350
- Category
- Article
- ISSN
- 0022-3093
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Amorphous and crystalline poly(silylenemethylene)s with the repeating PhRSiCH 2 (R : Me or Ph) units were characterized by positron annihilation lifetime spectroscopy (PALS) to gain insights into the molecular motions of these polymers. The temperature dependence of the ortho-positronium lifetime (
Seven well characterized zeolites were investigated by positron annihilation lifetime spectroscopy. The lifetime spectra were analysed in four discrete components. The third one was associated with ortho-positronium annihilation in the channels, framed in terms of infinite cylinders. Differences bet
## Abstract Positron annihilation lifetime spectroscopy (PALS) measurements were performed to study the influence of the sintering temperature, heating rate and dwell time on the porosity and on the defect concentration on series of spark plasma sintered alumina samples. Two longβlived components w