Simultaneous measurements of molecular forces and electro-optical properties of a confined 5CB liquid crystal film using a surface forces apparatus

Langmuir : the ACS Journal of Surfaces and Colloids
Kai KristiansenJacob N Israelachvili

Abstract

Using a surface forces apparatus (SFA), we studied the forces associated with the reorientation of molecules of a common nematic thermotropic liquid crystal, 4'-n-pentyl-4-cyanobiphenyl (5CB), confined between two conducting (silver) surfaces and its optical behavior under the influence of electric fields with varying magnitudes and field directions. A transient attractive force was observed due to partial reorientations of the liquid crystal molecules and the flow of free ions, in addition to a stronger constant capacitance attraction between the silver surfaces. At the same time, the optical properties of the liquid crystals were observed perpendicular to the silver surfaces. Observations of shifts and fluctuations of the extraordinary wave of the (multiple beam) interference fringes measure the refractive index of the director component parallel to the surface, which is sensitive to tilt motion (or reorientation) of the liquid crystal molecules that provided details of the anisotropic orientations of the molecules and domains. Any lateral differential refractive index change is easily observed by optical microscopy. The optical microscope imaging showed that the changes in the optical properties are due to convective flow at...Continue Reading

References

Mar 23, 2002·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·K Kocevar, I Musevic
May 21, 2005·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·B ZapponeH T Nguyen
Oct 18, 2007·Langmuir : the ACS Journal of Surfaces and Colloids·Hongbo ZengJacob N Israelachvili
May 25, 2012·Langmuir : the ACS Journal of Surfaces and Colloids·Marina Ruths, Bruno Zappone
May 30, 2013·Proceedings of the National Academy of Sciences of the United States of America·Matthew A GebbieJacob N Israelachvili

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Citations

Jul 15, 2016·Optics Express·Mengdi LuWei Peng
Apr 26, 2019·Soft Matter·Carla Sofia Perez-Martinez, Susan Perkin
Aug 17, 2020·Physical Review Letters·Łukasz RichterCarlos Drummond

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