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Surface topography and rotational symmetry breaking.

Rajratan Basu1, Ian R Nemitz, Qingxiang Song

  • 1Department of Physics, Case Western Reserve University, Cleveland, Ohio 44106, USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|September 26, 2012
PubMed
Summary

Researchers separated and quantified chiral and rub-induced rotational symmetry strengths for the surface electroclinic effect. This finding advances understanding of molecular director behavior under electric fields and surface topography.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Surface Science

Background:

  • The surface electroclinic effect involves molecular director rotation proportional to an applied electric field.
  • This effect necessitates both a chiral environment and low rotational symmetry (C(2) or lower) about the electric field.
  • Typically, surface topography manipulation creates these symmetries simultaneously, complicating analysis.

Purpose of the Study:

  • To separate and quantify the strengths of chiral symmetry and rub-induced C(∞) rotational symmetry breaking.
  • To investigate the relationship between surface topographical roughness and the electroclinic response.
  • To determine the influence of rubbing strength on symmetry strengths and azimuthal anchoring.

Main Methods:

  • Utilized a twist geometry with a pair of rubbed polymer-coated substrates.
  • Manipulated surface topography through rubbing to induce specific symmetries.
  • Measured the electroclinic response and correlated it with topographical root-mean-square (rms) roughness and rubbing strength.

Main Results:

  • Successfully separated and quantified the strengths of rub-induced rotational symmetry and chiral symmetry.
  • Observed a linear scaling of the reduced rotational symmetry strength with induced topographical rms roughness.
  • Found that the electroclinic response strength increases with increasing polymer rubbing strength.

Conclusions:

  • The study demonstrates a method to decouple and quantify symmetry contributions to the surface electroclinic effect.
  • Surface topographical roughness is a key factor influencing the strength of reduced rotational symmetry.
  • Azimuthal anchoring strength coefficient appears largely insensitive to variations in rubbing strength.