Electrically induced structure and ER effect of DNA particle suspensions

Keiji Minagawa, Atsushi Ogo, Hiroyuki Watanabe, Takeshi Mori, Masami Tanaka

    Research output: Contribution to conferencePaperpeer-review


    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.

    Original languageEnglish
    Number of pages2
    Publication statusPublished - 2006
    Event55th Society of Polymer Science Japan Symposium on Macromolecules - Toyama, Japan
    Duration: Sept 20 2006Sept 22 2006


    Other55th Society of Polymer Science Japan Symposium on Macromolecules

    All Science Journal Classification (ASJC) codes

    • Engineering(all)


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