Skip to Content.
Sympa Menu

fizinfo - [Fizinfo] Szemináriumok - Seminars: Ameer R.K. Nassrah

fizinfo AT


List archive

[Fizinfo] Szemináriumok - Seminars: Ameer R.K. Nassrah

Chronological Thread 
  • From: Szeminárium koordinátor <sem-admin AT>
  • To: SZFI User <szfkiuser AT>,Fizinfo <fizinfo AT>
  • Cc: Fizinfo <fizinfo AT>
  • Subject: [Fizinfo] Szemináriumok - Seminars: Ameer R.K. Nassrah
  • Date: Thu, 1 Feb 2024 06:00:02 +0100 (CET)
  • Authentication-results: (amavisd-new); dkim=pass (1024-bit key) reason="pass (just generated, assumed good)"

PhD Preliminary DefenseAmeer R.K. NassrahHUN-REN Wigner RCP
SZFIPhotoalignment at Liquid Crystal–Polymer InterfaceTuesday, 6 February
2024, 10:00, KFKI Campus, Bldg. 1, 2nd floor, Conference RoomProper,
controllable alignment of the liquid crystal (LC) molecules at solid
substrates is a key factor for correct operation of all LC-based devices.
Photoalignment is a promising, contactless method of achieving the required
alignment, which can be applied in enclosed areas (e.g., in microfluidic
channels), and which avoids the drawbacks of mechanical contacts (e.g.,
mechanical damages, accumulation of ions and dust particles). In these
photoaligning systems, a very small number of photochromic derivatives
anchored on a substrate commands the alignment of a very large number of LC
molecules in contact with it, and therefore, the surfaces were referred to as
“command surfaces”. The experiments were focusing on the influence of the LC
molecular structure and that of the LC phase on the photoalignment process.
The results indicate the importance of both the LC structure and the phase
[1,2]. An interaction mechanism has been proposed between the command surface
and the LC molecules for the peculiar photoalignment properties of LCs with
biphenyl rigid core. The proposed interaction mechanism has been validated by
additional experimental results [2]. The dependence of the photoalignment on
the composition of the command surface has also been tested. Drastic
differences have been found in the efficiency of the photoalignment depending
on the preparation method. AFM measurements have shown, that efficient
photoalignment is accompanied with a significant photo-induced mass transfer
[3].[1] A.R.K. Nassrah, I. Jánossy and T. Tóth-Katona, “Photoalignment at the
Nematic Liquid Crystal-Polymer Interface: The Importance of the Liquid
Crystalline Molecular Structure.” J. Mol. Liq., 312, 113309/1-7 (2020). [2]
A.R.K. Nassrah, I. Jánossy, V. Kenderesi, T. Tóth-Katona, “Polymer-Nematic
Liquid Crystal Interface: On the Role of the Liquid Crystalline Molecular
Structure and the Phase Sequence in Photoalignment.” Polymers 13, 193/1-13
(2021). [3] A.R.K. Nassrah, M. Batkova, N. Tomašovičová, T. Tóth-Katona,
“Photoaligning Polymeric Command Surfaces: Bind, or Mix?” Polymers 15,
4271/1-12 (2023).&nbsp;Minden érdeklődőt szívesen látunk! - Everyone is
welcome to attend.Attila Nagysem-admin AT

  • [Fizinfo] Szemináriumok - Seminars: Ameer R.K. Nassrah, Szeminárium koordinátor, 02/01/2024

Archive powered by MHonArc 2.6.19+.

Top of Page