D.C. conductivity behaviour of poly(vinyl alcohol)-based ferrogels: role of borax and carbonyl iron
| Autor: | Karesh Phondekar, Kiran Moodi, Jaison Joseph, Mathias B. Lawrence |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Vinyl alcohol
Polymers and Plastics Dopant Borax Sodium Inorganic chemistry chemistry.chemical_element 02 engineering and technology General Chemistry Conductivity 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Ion chemistry.chemical_compound Carbonyl iron chemistry Materials Chemistry 0210 nano-technology Boron |
| Zdroj: | Polymer Bulletin. 76:6327-6341 |
| ISSN: | 1436-2449 0170-0839 |
| DOI: | 10.1007/s00289-019-02719-w |
| Popis: | The d.c. conductivity of poly(vinyl alcohol) hydrogels and ferrogels, cross-linked with borax, has been studied using two-probe resistance measurement method as a function of cross-linker and dopant concentrations. The availability of charge carriers (i.e. unbound borate ions and free sodium ions) in these matrices is seen to vary with cross-linker and dopant concentrations. Increase in borax concentration leads to the rise in d.c. conductivity values. Enhancement in the carbonyl iron dopant proportions, at unchanged borax concentrations, causes a decrease in the conductivity. This behaviour is explained on the basis of structural modifications introduced within the network matrix owing to the variations in cross-linker and dopant concentrations. |
| Databáze: | OpenAIRE |
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