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Samarin, Sergey
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Publications (9/9 displayed)
- 2024Electrochemical characterization and structural analysis of (In2O3)/(Fe2O3) nanocomposites for high-performance supercapacitorscitations
- 2021Polymer-wrapped reduced graphene oxide/nickel cobalt ferrite nanocomposites as tertiary hybrid supercapacitorscitations
- 2020Porosity evaluation and positron annihilation study of mesoporous aluminum oxy-hydroxide ceramicscitations
- 2020Heterojunction formation in In2O3–NiO nanocompositescitations
- 2016Elastic versus inelastic spin-polarized electron scattering from a ferromagnetic surfacecitations
- 2013Influence of polar groups in binary polymer blends on positronium formationcitations
- 2007Magnetic anisotropy and electronic structure of iron films on W(1 1 0) by spin-polarized two-electron spectroscopy
- 2007Spin-dependent reflection of very-low-energy electrons from W(110)citations
- 2007Application of two-electron spectroscopy in reflection for studying electronic structure of surfaces and thin filmscitations
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article
Influence of polar groups in binary polymer blends on positronium formation
Abstract
The present work studied the role of the polar group unconjugated oxygen on the inhibition of positronium (Ps) formation in two binary blends made from a set of chosen constituent polymers with polar and weakly polar groups (nonpolar). The polymer blend samples of PVC-EVA and PVC-SAN were investigated by coincidence Doppler broadening and positron lifetime techniques. The strong polar acetate group in the EVA contributed to positron annihilation with electrons of unconjugated oxygen (-C+=O-) as revealed by the momentum distribution curves peaking around 17 PL (10 -3 m0c). The ortho-Ps intensity indicated the unconjugated oxygen shows about a 28% Ps reduction even in the presence of a strong Ps inhibiting halogen (Cl-). In contrast, this effect was not seen in the PVC-SAN blends since SAN contains a weakly polar (nonpolar) acrylonitrile group (C≡N). Our results indicate the chlorine of PVC in the blends is a major contributor to Ps inhibition through the formation of a (Cl --e+) bound state but the unconjugated oxygen in EVA of the PVC-EVA blend also plays a similar, but lesser, role. © 2013 American Physical Society.