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Student Seminar: Enhancement of Magnetic Response in Liquid Crystals

by | Jan 22, 2025 | research | 0 comments

Student Seminar
Name: Ms. Suprabha Pradhan
 
Title: Enhancement of Magnetic Response in Liquid Crystals
Date & Time: Thursday, 23rd January 2025 at 4.00 p.m. 
Venue: Rajarshi Bhattacharya Memorial  Lecture Hall, Chemical Sciences Building
Abstract:  
 
Liquid crystals (LCs) exhibit a unique state of matter that combines the fluidity of liquids with the ordered structure like crystals. This results in anisotropic properties, allowing LCs to respond to electric and magnetic fields, making them valuable in various applications, including displays and photonics.1 The reorientation of the molecules in electric fields extensively controls the optical properties of LCs (e.g., in liquid crystal displays). LCs can also be manipulated by magnetic fields as an alternative to electrical control, but their low diamagnetic anisotropy requires high magnetic fields for magnetic actuation. In this regard, doping magnetic nanoparticles (MNPs) into LCs, referred to as ferronematic, opens new avenues for designing novel magneto-responsive materials and devices for actuators, sensors, and data storage.2, 3 Magnetic nanoparticles can effectively modify the electro- and/or magneto-optical responses and other physical characteristics of LCs.4
In this presentation, I shall discuss the hybrid materials based on Magnetic Nanoparticles (MNPs) dispersed in liquid crystals (LC), the colloidal stability of the MNPs dispersion in the LC host by surface modifications of MNPs and their magneto-optical properties, the doping magnetic nanoparticles into liquid crystal elastomers and their promising magneto-responsive applications.
 
References:
  1. Liu, X.;  Kent, N.;  Ceballos, A.;  Streubel, R.;  Jiang, Y.;  Chai, Y.;  Kim, P. Y.;  Forth, J.;  Hellman, F.;  Shi, S.;  Wang, D.;  Helms, B. A.;  Ashby, P. D.;  Fischer, P.; Russell, T. P., Reconfigurable ferromagnetic liquid droplets. Science 2019, 365 (6450), 264-267.
  2. Mertelj, A.;  Lisjak, D.;  Drofenik, M.; Čopič, M., Ferromagnetism in suspensions of magnetic platelets in liquid crystal. Nature 2013, 504 (7479), 237-241.
  3. Wang, M.; Yin, Y., Magnetically Responsive Nanostructures with Tunable Optical Properties. J. Am. Chem. Soc. 2016, 138 (20), 6315-6323.
  4. Shuai, M.;  Klittnick, A.;  Shen, Y.;  Smith, G. P.;  Tuchband, M. R.;  Zhu, C.;  Petschek, R. G.;  Mertelj, A.;  Lisjak, D.;  Čopič, M.;  Maclennan, J. E.;  Glaser, M. A.; Clark, N. A., Spontaneous liquid crystal and ferromagnetic ordering of colloidal magnetic nanoplates. Nat. Commun. 2016, 7 (1), 10394.