6533b7d0fe1ef96bd125b7e7
RESEARCH PRODUCT
Colloidal electro-phoresis in the presence of symmetric and asymmetric electro-osmotic flow
Denis BotinThomas PalbergRan NiuJennifer Wenzlsubject
Range (particle radiation)Materials scienceMicrofluidicsFOS: Physical sciences02 engineering and technologyGeneral ChemistryCondensed Matter - Soft Condensed Matter021001 nanoscience & nanotechnologyCondensed Matter Physics01 natural sciencesMolecular physicsFlow (mathematics)Dynamic light scatteringElectric field0103 physical sciencesSoft Condensed Matter (cond-mat.soft)ParticleParticle velocityDiffusion (business)010306 general physics0210 nano-technologydescription
We characterize the electro-phoretic motion of charged sphere suspensions in the presence of substantial electro-osmotic flow using a recently introduced small angle super-heterodyne dynamic light scattering instrument (ISASH-LDV). Operation in integral mode gives access to the particle velocity distribution over the complete cell cross-section. Obtained Doppler spectra are evaluated for electro-phoretic mobility, wall electro-osmotic mobility and particle diffusion coefficient. Simultaneous measurements of differing electro-osmotic mobilities leading to asymmetric solvent flow are demonstrated in a custom made electro-kinetic cell fitting standard microscopy slides as exchangeable sidewalls. The scope and range of our approach are discussed demonstrating the possibility of an internal calibration standard and using the simultaneously measured electro-kinetic mobilities in the interpretation of a microfluidic pumping experiment involving an inhomogeneous electric field and a complex solvent flow pattern.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2018-01-01 | Soft Matter |