Nematic liquid crystal reorientation around multi-walled carbon nanotubes mapped via Raman microscopy

Year: 2016

Authors: Cacace T., García-García A., Zito G., Tkachenko V., Rusciano G., Geday M.A., Otón J.M., Marino A., Sasso, A.

Autors Affiliation: Inst Appl Sci & Intelligent Syst CNRISASI, Via Campi Flegrei 34,I-80078 Pozzuoli, NA, Italy; Univ Naples Federico II, Phys Dept E Pancini, Via Cinthia Monte S Angelo, I-80126 Naples, Italy; Univ Politecn Madrid, ETSI Telecomunicac, CEMDATIC, Ave Complutense 30, E-28040 Madrid, Spain; CNR, Natl Inst Opt, Via Campi Flegrei 34, I-80078 Pozzuoli, NA, Italy

Abstract: We have studied the formation of topological defects in liquid crystal (LC) matrices induced by multiwalled carbon nanotubes (MWCNTs) and external electric fields. The defects are ascribable to a distortion of the LC molecular director in proximity of the MWCNT surface. The system is analyzed macroscopically using spectroscopic variable angle ellipsometry. Concurrently, confocal micro-Raman spectroscopy is used to study the system state at the microscale. This allows to acquire a three-dimensional, spatially-resolved map of the topological defect, determining scale length variations and orientation topography of the LC molecules around the MWCNT

Journal/Review: OPTICS EXPRESS

Volume: 24 (14)      Pages from: 15954  to: 15964

More Information: This work has been partially supported by ICT COST Action IC1208 Integrating devices and materials: a challenge for new instrumentation in ICT and Spanish Government RETOS Program grant no. TEC2013-47342-C2-R.
KeyWords: Dispersions
DOI: 10.1364/OE.24.015954

Citations: 5
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