MWN for the Study of Macromolecular Ferrofluids
Download
1 / 2

0602932 Riffle - PowerPoint PPT Presentation


  • 162 Views
  • Uploaded on

MWN for the Study of Macromolecular Ferrofluids Judy S. Riffle, Virginia Polytechnic Institute and State University, DMR 0602932.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about '0602932 Riffle' - olwen


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
MWN for the Study of Macromolecular FerrofluidsJudy S. Riffle, Virginia Polytechnic Institute and State University, DMR 0602932

PDMS-Magnetite nanostructures have been rationally designed to form neat ferrofluids that can be remotely manipulated with magnetic fields. We have a modeling tool for calculating the sizes of sterically-stabilized single-particle complexes to an accuracy within 10%. Using a modified DLVO theory for particle interactions, this tool also predicts the onset of colloidal instability in these magnetic suspensions.

Top figure: A representative TEM image shows a well-defined magnetite core. Bottom figure: Particle histograms of repeated magnetite syntheses show a high degree of reproducibility.

Table: Comparison of number average diameters Dn from dynamic light scattering (DLS) with those predicted by the model, with no adjustable parameters, show excellent agreement.


Remote Shape Control of Macromolecular Ferrofluid DropletsJudy S. Riffle, Virginia Polytechnic Institute and State University, DMR 0602932

The Materials World Network for the Study of Macromolecular Ferrofluids addresses the chemistry, engineering and physics that govern remote control over the shapes and locations of magnetic droplets suspended in immiscible media. Top: Raquel Mejia-Ariza (left, VT student) and Annette Tyler (right, UWA student) collaborate at VT to understand the influence of interfacial tension on the shapes of magnetic PDMS droplets in uniform magnetic fields. Bottom: Droplet shape in uniform fields results from a balance between particle alignment induced by the field and interfacial energy.

1. S. Afkhami, Y. Renardy, M. Renardy, J.S. Riffle, T.G. St. Pierre, J. Fluid Mechanics, 610, 363-80 (2008).

2. O.T. Mefford, M.L. Vadala, M.R.J. Carroll, R. Mejia-Ariza, B.L. Caba, T.G. St. Pierre, R.C. Woodward, R.M. Davis, J.S. Riffle, Langmuir, 24(9), 5060-69 (2008).


ad