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A Micropatterning Assay for Measuring Cell Chirality
08:07

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Published on: March 11, 2022

Mechanically generated surface chirality at the nanoscale.

Sameh Ferjani1, Yoonseuk Choi, Joel Pendery

  • 1Department of Physics, Case Western Reserve University, Cleveland, Ohio 44106-7079, USA.

Physical Review Letters
|September 28, 2010
PubMed
Summary
This summary is machine-generated.

Researchers created a chiral surface using atomic force microscopy on polyimide. This surface induced a unique molecular response in liquid crystals, demonstrating surface chirality through an electric field-induced effect.

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Area of Science:

  • Materials Science
  • Surface Science
  • Liquid Crystal Physics

Background:

  • Surface topography influences molecular alignment.
  • Chirality at surfaces can lead to unique optical and electrical properties.
  • Polyimide alignment layers are common in liquid crystal devices.

Purpose of the Study:

  • To create and demonstrate surface chirality on a polyimide layer.
  • To investigate the molecular response of liquid crystals to a chiral surface.
  • To establish a method for detecting surface chirality.

Main Methods:

  • Bidirectional scribing of a polyimide-coated substrate using atomic force microscopy to create noncentrosymmetric topography.
  • Contacting the chiral surface with a planar-aligned, negative dielectric anisotropy, achiral nematic liquid crystal.
  • Applying an electric field (E) to the liquid crystal and observing the director's response.

Main Results:

  • The scribed polyimide surface exhibited noncentrosymmetric topography, inducing molecular-level chirality.
  • The nematic liquid crystal director showed an azimuthal rotation approximately linear with the applied electric field.
  • This observed effect, termed the "surface electroclinic effect," is a direct signature of surface chirality.

Conclusions:

  • Achiral polyimide surfaces can be controllably rendered chiral through topographic modification.
  • The surface electroclinic effect provides a clear, measurable signature of surface chirality.
  • This work opens avenues for designing surfaces with specific chiral properties for advanced applications.