The role of positron annihilation lifetime studies and nuclear sensors for characterising porous materials

A series of nuclear sensors were designed to assess the chemistry within the nanopores of a porous material. The nuclear sensors of varying size, charge, and hydrophobicity were exposed to hollow silica shells (HSS) at varying pH. Uptake and release kinetics were studied over a 24 h period at room t...

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Bibliographic Details
Published in:Journal of physics. Conference series 2011-01, Vol.262 (1), p.012040-4
Main Authors: Mume, E, Uedono, A, Mizunaga, G, Lynch, D E, Smith, S V
Format: Article
Language:English
Subjects:
High speed tool steels
Hydrophobicity
Physics
Porosity
Porous materials
Positron annihilation
Room temperature
Sensors
Silicon dioxide
Uptakes
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Summary:A series of nuclear sensors were designed to assess the chemistry within the nanopores of a porous material. The nuclear sensors of varying size, charge, and hydrophobicity were exposed to hollow silica shells (HSS) at varying pH. Uptake and release kinetics were studied over a 24 h period at room temperature. Preliminary study indicate positively charged nuclear sensors were selectively and rapidly (within 10 min) absorbed by the HSS at pH 7 to 9. PALS showed there were two types of pores (1.7 and 0.7 nm) present. The data suggest the nuclear sensors sit within the larger pore of the HSS. Both PALS and nuclear sensors are required to obtain an accurate insight into the nanoporosity of the hollow silica shells.
ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/262/1/012040