Investigating the time-dependent zeta potential of wood surfaces
| Autor: | Benjamin Michen, Thomas Luxbacher, Ingo Burgert, Livius F. Muff |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Nanoporous Diffusion 02 engineering and technology Electrolyte 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Streaming current 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Ion Condensed Matter::Soft Condensed Matter Biomaterials Electrokinetic phenomena Colloid and Surface Chemistry Chemical physics Phase (matter) Zeta potential 0210 nano-technology |
| Zdroj: | Journal of colloid and interface science. 518 |
| ISSN: | 1095-7103 |
| Popis: | This work reports on streaming potential measurements through natural capillaries in wood and investigates the cause of a time-dependent zeta potential measured during the equilibration of wood cell-walls with an electrolyte solution. For the biomaterial, this equilibration phase takes several hours, which is much longer than for many other materials that have been characterized by electrokinetic measurements. During this equilibration phase the zeta potential magnitude is decaying due to two parallel mechanisms: (i) the swelling of the cell-wall which causes a dimensional change reducing the charge density at the capillary interface; (ii) the transport of ions from the electrolyte solution into the permeable cell-wall which alters the electrical potential at the interface by internal charge compensation. The obtained results demonstrate the importance of equilibration kinetics for an accurate determination of the zeta potential, especially for materials that interact strongly with the measurement electrolyte. Moreover, the change in zeta potential with time can be correlated with the bulk swelling of wood if the effect of electrolyte ion diffusion is excluded. This study shows the potential of streaming potential measurements of wood, and possibly of other hygroscopic and nanoporous materials, to reveal kinetic information about their interaction with liquids, such as swelling and ion uptake. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect