Electrorheological (ER) suspensions were prepared with three types of DNA particles. The DNA particles used were unpurified salmon testes DNA, DNA purified by a standard method, and a DNA/lipid complex. These particles, having the average diameter of 15-20 μm, were respectively dispersed in silicone oil (1000 cSt). It was found from viscosity measurements under a DC electric field ranging between 0 and 2 kV/mm that these suspensions show an ER effect. The increase of viscosity was larger for the suspension of purified DNA particles than those of the unpurified DNA and the DNA/lipid complex suspensions. The ER effect evaluated as relative enhancement of viscosity was large when the particle concentration was 20 wt%. Repeated application of an electric field resulted in stabilized reversible increase of viscosity in response to the field. Although the ER effect of the suspensions prepared with the DNA/lipid complex was not so large, the chemical modification of DNA can be utilized for preparation of various types of DNA-based particles for ER fluids.
|Number of pages||2|
|Publication status||Published - Dec 1 2006|
|Event||55th Society of Polymer Science Japan Symposium on Macromolecules - Toyama, Japan|
Duration: Sep 20 2006 → Sep 22 2006
|Other||55th Society of Polymer Science Japan Symposium on Macromolecules|
|Period||9/20/06 → 9/22/06|
All Science Journal Classification (ASJC) codes