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Structural Changes in Block Copolymers: Coupling of Electric Field and Mobile Ions Yoav Tsori,1
 

Summary: Structural Changes in Block Copolymers: Coupling of Electric Field and Mobile Ions
Yoav Tsori,1
Franc¸ois Tournilhac,1
David Andelman,2
and Ludwik Leibler1
1
Laboratoire Matie`re Molle & Chimie (UMR 167), ESPCI, 10 rue Vauquelin, 75231 Paris CEDEX 05, France
2
School of Physics and Astronomy, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University,
69978 Ramat Aviv, Israel
(Received 26 July 2002; published 10 April 2003)
We argue that the presence of dissociated ions in block copolymers under electric fields can induce
strong morphological changes and even lead to phase transitions. We investigate, in particular, diblock
copolymers in the body centered cubic (bcc) phase. In pure dielectric materials (no free charges), a
dielectric breakdown is expected to occur for large enough electric fields, preempting any structural
phase transition. On the other hand, dissociated ions are predicted to induce a phase transition to a
hexagonal array of cylinders, at fields of about 10 V=m or even lower. The strength of this mechanism
can be tuned by controlling the amount of free ions present.
DOI: 10.1103/PhysRevLett.90.145504 PACS numbers: 61.25.Hq, 61.41.+e, 64.70.Nd
Designed control of material properties in the submi-

  

Source: Andelman, David - School of Physics and Astronomy, Tel Aviv University

 

Collections: Materials Science; Physics