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Electrohydrodynamic flows in electrochemical systems
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Saville, D. A. |
| Copyright Year | 2005 |
| Description | Recent studies have established a new class of assembly processes with colloidal suspensions. Particles are driven together to form large crystalline structures in both dc and ac fields. The current work centers on this new class of flows in ac fields. In the research carried out under the current award, it was established that: (i) Small colloidal particles crystallize near an electrode due to electrohydrodynamic flows induced by an sinusoidally varying applied potential. (ii) These flows originate due to disturbances in the electrode polarization layer arising from the presence of the particles. Inasmuch as the charge and the field strength both scale on the applied field, the flows are proportional to the square of the applied voltage. (iii) Suspensions of two different sorts of particles can be crystallized and will form well-ordered binary crystals. (iv) At high frequencies the EHD flows die out. Thus, with a homogeneous system the particles become widely spaced due to dipolar repulsion. With a binary suspension, however, the particles may become attractive due to dipolar attraction arising from differences in electrokinetic dipoles. Consequently binary crystals form at both high and low frequencies. |
| File Size | 410255 |
| Page Count | 9 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20050186542 |
| Archival Resource Key | ark:/13960/t2x39rf03 |
| Language | English |
| Publisher Date | 2005-06-01 |
| Access Restriction | Open |
| Subject Keyword | Plasma Physics Nasa Programs Direct Current Colloids Crystallization Electrokinetics Crystals Electric Fields Electrohydrodynamics Alternating Current Electric Field Strength Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
