Skip to Main Content
 

Global Search Box

 
 
 
 

Files

File List


Dissertation_Angelo_2018.pdf (2.85 MB)

ETD Abstract Container

Abstract Header

Direct Mechanical Observation of Surface Anchoring and Disclinations Using Dynamically Reconfigurable Liquid Crystal Cell

Angelo, Joseph S, Angelo
http://rave.ohiolink.edu/etdc/view?acc_num=kent1532646624675951

Abstract Details

2018, PHD, Kent State University, College of Arts and Sciences / Chemical Physics.
Our research uses a dynamic cell to measure azimuthal anchoring energy and disclination line tension in a nematic liquid crystal. The dynamic cell is a cell which has controllable twist angle and cell thickness. By increasing the twist angle to an angle greater than 90 degrees, the cell becomes super twisted. In this state, if the cell thickness is decreased to a critical thickness, the surface anchoring breaks. The azimuthal anchoring energy can be calculated from the twist elastic constant, the twist angle, and the cell thickness. When the anchoring breaks, a disclination line is formed separating regions of opposite handed twist. By balancing the forces due to the disclination line tension and the twist distortion, a stable disclination line can be achieved. We can calculate the line tension of the disclination from the radius of curvature of the disclination line at equilibrium. In order to generate disclination lines more easily, we designed a disclination line nucleation site by photopatterned surface alignment. We found that the line tension increases with the cell thickness. By measuring the line tension with respect to cell thickness and temperature, we investigate the core of the disclination line.
Hiroshi Yokoyama, PhD (Advisor)
Peter Palffy-Muhoray, PhD (Committee Member)
Elizabeth Mann, PhD (Committee Member)
Antal Jakli, PhD (Committee Member)
Sam Sprunt, PhD (Committee Member)
111 p.
Condensed Matter Physics; Physics
liquid crystal; surface anchoring; anchoring energy; disclination; liquid crystal defect

Recommended Citations

Citations

  • Angelo, Angelo, J. S. (2018). Direct Mechanical Observation of Surface Anchoring and Disclinations Using Dynamically Reconfigurable Liquid Crystal Cell [Doctoral dissertation, Kent State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=kent1532646624675951

    APA Style (7th edition)

  • Angelo, Angelo, Joseph. Direct Mechanical Observation of Surface Anchoring and Disclinations Using Dynamically Reconfigurable Liquid Crystal Cell. 2018. Kent State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=kent1532646624675951.

    MLA Style (8th edition)

  • Angelo, Angelo, Joseph. "Direct Mechanical Observation of Surface Anchoring and Disclinations Using Dynamically Reconfigurable Liquid Crystal Cell." Doctoral dissertation, Kent State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=kent1532646624675951

    Chicago Manual of Style (17th edition)

kent1532646624675951
393
© 2018, some rights reserved.Creative Commons License Direct Mechanical Observation of Surface Anchoring and Disclinations Using Dynamically Reconfigurable Liquid Crystal Cell by Joseph S Angelo Angelo is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. Based on a work at etd.ohiolink.edu.
This open access ETD is published by Kent State University and OhioLINK.