Electrokinetic, electrorheological and viscoelastic properties of Polythiophene- graft -Chitosan copolymer particles
| Autor: | Mehmet Cabuk, Mustafa Yavuz, Halil Ibrahim Unal |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Materials science
02 engineering and technology Electrolyte 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Viscoelasticity 0104 chemical sciences Electrorheological fluid Colloid Electrokinetic phenomena Colloid and Surface Chemistry Isoelectric point Chemical engineering Zeta potential Organic chemistry 0210 nano-technology Dispersion (chemistry) |
| Zdroj: | Colloids and Surfaces A: Physicochemical and Engineering Aspects. 510:231-238 |
| ISSN: | 0927-7757 |
| Popis: | Electrokinetic properties of Polythiophene-graft-Chitosan (PT-g-CS) copolymer were investigated by means of zeta (zeta)-potential measurements as a function of pH, electrolytes, surfactants, and temperature in aqueous medium. The c-Potential of pure PT was observed to enhance from +25 mV to +36 mV after grating with polycationic CS. Concomitantly, the isoelectric point of the pure PT shifted from 6.4 to 8.3. The zeta-Potential of PT-g-CS dispersion also shifted to more positive regions with increasing valency of the electrolytes and concentrations of cationic surfactant (cetyltrimethylammonium bromide). The c-Potential of PT-g-CS was determined to be +38 mV which indicated colloidal stability in silicone oil (SO) medium. Electrorheological (ER) and viscoelastic measurements revealed that the PT-g-CS/SO system has elasto-viscous behavior under applied electric field strengths. The yield stress of the ER fluid was determined to be a function of the electric field strength in a power law form as tau(y) = E-1.55 which obey to the conduction model. Creep and creep-recovery tests revealed reversible non-linear viscoelastic deformations of %31 |
| Databáze: | OpenAIRE |
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