TY - JOUR
T1 - Cochleate-Doped Liquid Crystal as Switchable Metamaterial Window Mediated by Molecular Orientation Modified Aggregation
AU - Madhuri, Pappu Lakshmi
AU - Shuddhodana,
AU - Judeh, Zaher M.A.
AU - Abdulhalim, Ibrahim
N1 - Funding Information:
We would like to thank Lee Wing Shan, Jin Yongjie, and Dr. Shang Huimin for their technical assistance. This work was supported by the Research Grants Council of the Hong Kong SAR Government under the Theme-based Research Scheme (T12-403/15-N, T12-401/16-W), a collaborative research agreement from Grail, and the Vice Chancellor’s One-Off Discretionary Fund of The Chinese University of Hong Kong (VCF2014021). Y.M.D.L. is supported by an endowed chair from the Li Ka Shing Foundation.
Publisher Copyright:
© 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2020/5/1
Y1 - 2020/5/1
N2 - A diversity of fascinating hollow and porous micro and nanoparticles are being developed for drug delivery purposes; however, their applications in other systems are barely touched. When filled by an active material, they form a tunable photonic metamaterial. Here, a small concentration of organic hollow cylinders called cochleates embedded into liquid crystals (LCs) is demonstrated to form a new switchable composite to control light scattering with voltage and temperature. The biocompatible cochleates, which are hollow, tube-like, and hydrophilic in nature, can trap the liquid crystal molecules thus altering the system behavior. A switching device as thin as 6 µm with 12 wt% cochleates concentration is shown to be adequate to reveal a switchable privacy window. Possible molecular arrangement of the liquid crystal within the cochleate particles is suggested, and unexpected increase of the scattering with temperature depending on the applied voltage is observed as a result of change in the cochleate aggregation depending on the LC molecule orientation.
AB - A diversity of fascinating hollow and porous micro and nanoparticles are being developed for drug delivery purposes; however, their applications in other systems are barely touched. When filled by an active material, they form a tunable photonic metamaterial. Here, a small concentration of organic hollow cylinders called cochleates embedded into liquid crystals (LCs) is demonstrated to form a new switchable composite to control light scattering with voltage and temperature. The biocompatible cochleates, which are hollow, tube-like, and hydrophilic in nature, can trap the liquid crystal molecules thus altering the system behavior. A switching device as thin as 6 µm with 12 wt% cochleates concentration is shown to be adequate to reveal a switchable privacy window. Possible molecular arrangement of the liquid crystal within the cochleate particles is suggested, and unexpected increase of the scattering with temperature depending on the applied voltage is observed as a result of change in the cochleate aggregation depending on the LC molecule orientation.
KW - cochleates
KW - liquid crystals
KW - tunable metamaterials
UR - http://www.scopus.com/inward/record.url?scp=85082816815&partnerID=8YFLogxK
U2 - 10.1002/ppsc.202000067
DO - 10.1002/ppsc.202000067
M3 - Article
AN - SCOPUS:85082816815
SN - 0934-0866
VL - 37
JO - Particle and Particle Systems Characterization
JF - Particle and Particle Systems Characterization
IS - 5
M1 - 2000067
ER -