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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Optical sensor platform based on cellulose nanocrystals (CNC)-4'-(hexyloxy)-4-biphenylcarbonitrile (HOBC) bi-phase nematic liquid crystal composite films

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Santos, Moliria V. ; Tercjak, Agnieszka ; Gutierrez, Junkal ; Barud, Hernane S. ; Napoli, Mariana ; Nalin, Marcelo ; Ribeiro, Sidney J. L.
Total Authors: 7
Document type: Journal article
Source: Carbohydrate Polymers; v. 168, p. 346-355, JUL 15 2017.
Web of Science Citations: 3

The preparation of composite materials has gained tremendous attention due to the potential synergy of the combined materials. Here we fabricate novel thermal/electrical responsive photonic composite films combining cellulose nanocrystals (CNC) with a low molecular weight nematic liquid crystal (NLC), 4'-(hexyloxy)-4-biphenylcarbonitrile (HOBC). The obtained composite material combines both intense structural coloration of photonic cellulose and thermal and conductive properties of NLC. Scanning electron microscopy (SEM) results confirmed that liquid crystals coated CNC films maintain chiral nematic structure characteristic of CNC film and simultaneously, transversal cross-section scanning electron microscopy images indicated penetration of liquid crystals through the CNC layers. Investigated composite film maintain NLC optical properties being switchable as a function of temperature during heating/cooling cycles. The relationship between the morphology and thermoresponsive in the micro/nanostructured materials was investigated by using transmission optical microscopy (TOM). Conductive response of the composite films was proved by Electrostatic force microscopy (EFM) measurement. Designed thermo- and electro-responsive materials open novel simple pathway of fabrication of CNC-based materials with tunable properties. (C) 2017 Published by Elsevier Ltd. (AU)

FAPESP's process: 14/12424-2 - Optical properties of colloidal suspensions and films based on nanocelluloses and lanthanides
Grantee:Moliria Vieira dos Santos
Support type: Scholarships in Brazil - Doctorate
FAPESP's process: 13/07793-6 - CEPIV - Center for Teaching, Research and Innovation in Glass
Grantee:Edgar Dutra Zanotto
Support type: Research Grants - Research, Innovation and Dissemination Centers - RIDC
FAPESP's process: 12/05087-4 - Synthesis of glasses and glassceramics in the system SbPO4-PbO-ZnO doped with manganese and iron.
Grantee:Renata Fernandes Siqueira
Support type: Scholarships in Brazil - Master