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

D. Chaudhary, M. R. Went, K. Nakagawa, S. J. Buckman, J. P. Sullivan

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    18 Citations (Scopus)

    Abstract

    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.

    Original languageEnglish
    Pages (from-to)2635-2637
    Number of pages3
    JournalMaterials Letters
    Volume64
    Issue number23
    DOIs
    Publication statusPublished - 15 Dec 2010

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