Technical Information Magazine 202101-04 Evaluation of Barrier Films and Separation Membranes Using Positrons
The technical information magazine The TRC News provides the latest information on analytical techniques that are useful for research and development, solving production troubles, and quality control.
**Abstract** The development of materials with innovative barrier and separation properties, such as gas transport characteristics (permeability, diffusivity, and adsorption of gases and vapors), requires the evaluation of sub-nanometer void structures (voids less than 1 nm). Therefore, techniques for assessing molecular-level voids are needed, and positron annihilation lifetime spectroscopy becomes a powerful tool. This paper presents examples of approaching the relationship between sub-nanometer void structures and gas transport properties by synergistically utilizing positron annihilation lifetime spectroscopy and other methods on polyethylene terephthalate and silica thin films. **Table of Contents** 1. Introduction 2. Principles of Positron Annihilation Lifetime Measurement 3. Application Examples for PET with Different Crystallinities 4. Application Examples for Silica Thin Films with Different Densities 5. Conclusion
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Technical Information Magazine The TRC News "Evaluation of Sub-Nanometer Voids Related to Gas Transport in Barrier and Separation Membranes Using Positrons" [Abstract] In the development of materials with innovative gas transport properties such as barrier and separation characteristics (permeability, diffusivity, and adsorption of gases and vapors), the evaluation of sub-nanometer void structures (voids less than 1 nm) becomes crucial. Therefore, techniques to assess molecular-level voids are required, and positron annihilation lifetime spectroscopy serves as a powerful tool. This paper presents examples of approaching the relationship between sub-nanometer void structures and gas transport properties by synergistically utilizing positron annihilation lifetime spectroscopy and other methods on polyethylene terephthalate and silica thin films. [Table of Contents] 1. Introduction 2. Principles of Positron Annihilation Lifetime Measurement 3. Application Examples for PET with Different Crystallinities 4. Application Examples for Silica Thin Films with Different Densities 5. Conclusion [Figures and Tables] Figures 1-8, Tables 1-2 Oxygen permeability coefficients, diffusion coefficients, and solubility coefficients of PET with different crystallinities, o-Ps lifetime and formation probability under vacuum FT-IR spectra under room temperature vacuum Water desorption rates of PECVD films D-normalized intensity and positron lifetime of silica thin films under room temperature vacuum
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