Jump to main content
Jump to site search

Issue 44, 2018
Previous Article Next Article

Switchable electrorheological activity of polyacrylonitrile microspheres by thermal treatment: from negative to positive

Author affiliations

Abstract

The study focuses on the effect of thermal deformation degree of polyacrylonitrile (PAN) particles on the electrorheological (ER) properties of their suspensions. The heat-treated PAN particles are manufactured as ER materials using a thermocatalytic processes. The molecular structures of ER materials are analyzed to confirm a stabilization or a carbonization degree. We categorized the prepared ER particles into three basic types according to their deformation degree: Thermal dried PAN, stabilized PAN, and pre-carbonized PAN. The raw, stabilized, and pre-carbonized PAN particle-dispersed suspensions showed positive ER properties. The ER properties are enhanced as the heat-treatment temperature increases due to improved dielectric property. However, the thermal dried PAN particle ER suspensions showed negative ER behavior though the particles have higher conductivity and dielectric constants than those of the host fluid, which is contrary to the conduction model. XRD results indicate that the ER materials could show contradictory ER behavior even if they have the same molecular structures due to their crystallinity. This discovery is expected to boost the development of both positive ER and negative ER suspensions based on carbonaceous ER materials.

Graphical abstract: Switchable electrorheological activity of polyacrylonitrile microspheres by thermal treatment: from negative to positive

Back to tab navigation

Supplementary files

Publication details

The article was received on 17 Aug 2018, accepted on 01 Oct 2018 and first published on 01 Oct 2018


Article type: Paper
DOI: 10.1039/C8SM01691G
Citation: Soft Matter, 2018,14, 8912-8923
  •   Request permissions

    Switchable electrorheological activity of polyacrylonitrile microspheres by thermal treatment: from negative to positive

    T. Do, Y. G. Ko, Y. Chun, Y. Jung, U. S. Choi, Y. Park and J. Woo, Soft Matter, 2018, 14, 8912
    DOI: 10.1039/C8SM01691G

Search articles by author

Spotlight

Advertisements