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

作者：Chaudhary D; Went M R^*; Nakagawa K; Buckman S J; Sullivan J P

来源：Materials Letters, 2010, 64(23): 2635-2637.

DOI：10.1016/j.matlet.2010.08.045

• Chitosan
• Polymer
• Positron annihilation lifetime spectroscopy
• Porosity

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.

• 出版日期2010-12-15