کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
611316 | 880672 | 2008 | 5 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Field induced phase segregation in ferrofluids Field induced phase segregation in ferrofluids](/preview/png/611316.png)
We study the phase segregation in magnetite ferrofluids under the influence of an external magnetic field. A phase with lower nanoparticle density and corresponding higher optical transmission is formed in the bottom of a glass cell in the presence of only a very modest magnetic field gradient (smaller than 25 T/m25 T/m). The flux density in our magnetic configuration is simulated using finite element methods. Upon switching off the external magnetic field, the low-density phase develops into a ‘bubble’-like feature. The kinetics of this ‘bubble’ in the absence and presence of a magnetic field are described and analyzed in terms of a simple model, which takes into account buoyancy and drag forces.
Field-induced phase segregation in magnetite ferrofluid, as observed by video imaging, showing the formation of a low density ‘bubble’. The ‘bubble’ height increases continuously with time due to buoyancy.Figure optionsDownload as PowerPoint slide
Journal: Journal of Colloid and Interface Science - Volume 327, Issue 1, 1 November 2008, Pages 261–265