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Di usiophoresis as Ruling E ect : In uence of Organic Salts on Thermodi usion of Iron Oxide Nanoparticles
| Content Provider | Semantic Scholar |
|---|---|
| Author | Sehnem, André Luiz Figueiredo, António |
| Copyright Year | 2018 |
| Abstract | Colloidal particles, including ferro uidic nanoparticles (NP), move in a temperature gradient due to thermodi usion. Organic salts, which are often added to disperse the NP in aqueous solution, also move in the temperature gradient. This can have a strong in uence on the behaviour of the NP, which not only respond to the temperature gradient, but also to the concentration gradient of the dispersive salt, an e ect termed di usiophoresis. In this work we present experimental results on thermodi usion of iron oxide nanoparticles dispersed in aqueous solutions of organic hydroxides, which illustrate the possibility to manipulate the thermodi usion of NP through the addition of organic salts. Our experiments investigate the temperature dependence of the particles' Soret coe cient, a recurring question on thermodi usion of water dispersed particles. Existing theoretical approaches are compared and we relate the Soret coe cient of the NP with two main physical parameters ruling particle motion: the NP's electrostatic potential and the Soret coe cient of the dispersing ions. These parameters are also experimentally determined. At the order of magnitude of the NP's Soret coe cient good agreement between experiments and theory is achieved by including the experimental data on the Soret coe cient of the dispersing ions and therefore the NP's displacement due to the ion concentration gradient. Taking into account the temperature dependence of such previously unknown parameters is a relevant step to describe the temperature dependence of the NP's Soret coe cient. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://juser.fz-juelich.de/record/859035/files/article%20main%20text%20final.pdf |
| Alternate Webpage(s) | http://juser.fz-juelich.de/record/859035/files/article%20main%20text%20final.pdf?subformat=pdfa |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
