Molecular pore size characterization within chitosan biopolymer using positron annihilation lifetime spectroscopy

Positron annihilation lifetime spectroscopy has been used to study a chitosan biopolymer, to which nanoclay has been added, and the effect of water absorption and cross-linking on the microporosity. All measurements were conducted at room temperature. The free volume size of the biopolymer samples w...

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Bibliographic Details
Published inMaterials letters Vol. 64; no. 23; pp. 2635 - 2637
Main Authors Chaudhary, D., Went, M.R., Nakagawa, K., Buckman, S.J., Sullivan, J.P
Format Journal Article
LanguageEnglish
Published Elsevier B.V 15.12.2010
Subjects
Chitosan
Polymer
Porosity
Positron annihilation lifetime spectroscopy
Polymer
Chitosan
Porosity
Positron annihilation lifetime spectroscopy
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Summary:Positron annihilation lifetime spectroscopy has been used to study a chitosan biopolymer, to which nanoclay has been added, and the effect of water absorption and cross-linking on the microporosity. All measurements were conducted at room temperature. The free volume size of the biopolymer samples was obtained based on the ortho-positronium lifetime, and the relative concentration of free volume cavities was measured by the ortho-positronium intensity. Using the PALS technique, effects of hydration were observed as a reduction in the measured pore size. Similarly, the cross-linked samples exhibited an increase in intensity of the smallest pores commensurate with the SEM observations.
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content type line 23
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2010.08.045