Humidity-Responsive Photonic Films and Coatings Based on Tuned Cellulose Nanocrystals/Glycerol/Polyethylene Glycol

It has been extensively reported that cellulose nanocrystals (CNCs) can represent structural colors due to their unique chiral-nematic self-assembly. However, the application of this remarkable structure does need further investigation. It has been challenging to keep the selective reflection band (...

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Autores principales:	Amin Babaei-Ghazvini, Bishnu Acharya
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	cellulose nanocrystals humidity sensors chiral nematic photonic films Organic chemistry QD241-441
Acceso en línea:	https://doaj.org/article/37b823f23aaf44d5832cb4b347a3d6ec
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spelling	oai:doaj.org-article:37b823f23aaf44d5832cb4b347a3d6ec2021-11-11T18:44:12ZHumidity-Responsive Photonic Films and Coatings Based on Tuned Cellulose Nanocrystals/Glycerol/Polyethylene Glycol10.3390/polym132136952073-4360https://doaj.org/article/37b823f23aaf44d5832cb4b347a3d6ec2021-10-01T00:00:00Zhttps://www.mdpi.com/2073-4360/13/21/3695https://doaj.org/toc/2073-4360It has been extensively reported that cellulose nanocrystals (CNCs) can represent structural colors due to their unique chiral-nematic self-assembly. However, the application of this remarkable structure does need further investigation. It has been challenging to keep the selective reflection band (SRB) resulting from the CNC structure in the visible spectrum. Herein, composition of CNC colloidal suspensions with polyethylene glycol (PEG) and glycerol (Gly) have been studied to develop humidity-responsive sensors in the form of coatings and films. The fabricated samples were characterized for their mechanical properties, optical properties, water uptake capacity, water contact angle, and surface roughness. Additionally, the chemical structure of the samples was studied with FTIR spectroscopy. The produced humidity indicators on microbial glass slides were maintained and tested in a different relative humidity range from 20% to 98% with a different color response from blue to red, respectively. The color change of the humidity sensors was reversible for several cycles. It should be noted that the color change can be detected easily by the naked eye. The water uptake test showed that pure CNC and CNC/Gly had the lowest (34%) and highest (83%) water absorption levels. The mechanical tests for CNC/PEG composites showed the highest tensile strength (40.22 MPa). Moreover, microstructural characterizations confirmed the CNC pitch formation in all the samples. Addition of the fillers increased the CNC pitch, resulting in a mesoporous film formation. These produced humidity sensors are promising candidates in food and drug packaging due to their biodegradability, biocompatibility, and cost-effectiveness.Amin Babaei-GhazviniBishnu AcharyaMDPI AGarticlecellulose nanocrystalshumidity sensorschiral nematicphotonic filmsOrganic chemistryQD241-441ENPolymers, Vol 13, Iss 3695, p 3695 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	cellulose nanocrystals humidity sensors chiral nematic photonic films Organic chemistry QD241-441
spellingShingle	cellulose nanocrystals humidity sensors chiral nematic photonic films Organic chemistry QD241-441 Amin Babaei-Ghazvini Bishnu Acharya Humidity-Responsive Photonic Films and Coatings Based on Tuned Cellulose Nanocrystals/Glycerol/Polyethylene Glycol
description	It has been extensively reported that cellulose nanocrystals (CNCs) can represent structural colors due to their unique chiral-nematic self-assembly. However, the application of this remarkable structure does need further investigation. It has been challenging to keep the selective reflection band (SRB) resulting from the CNC structure in the visible spectrum. Herein, composition of CNC colloidal suspensions with polyethylene glycol (PEG) and glycerol (Gly) have been studied to develop humidity-responsive sensors in the form of coatings and films. The fabricated samples were characterized for their mechanical properties, optical properties, water uptake capacity, water contact angle, and surface roughness. Additionally, the chemical structure of the samples was studied with FTIR spectroscopy. The produced humidity indicators on microbial glass slides were maintained and tested in a different relative humidity range from 20% to 98% with a different color response from blue to red, respectively. The color change of the humidity sensors was reversible for several cycles. It should be noted that the color change can be detected easily by the naked eye. The water uptake test showed that pure CNC and CNC/Gly had the lowest (34%) and highest (83%) water absorption levels. The mechanical tests for CNC/PEG composites showed the highest tensile strength (40.22 MPa). Moreover, microstructural characterizations confirmed the CNC pitch formation in all the samples. Addition of the fillers increased the CNC pitch, resulting in a mesoporous film formation. These produced humidity sensors are promising candidates in food and drug packaging due to their biodegradability, biocompatibility, and cost-effectiveness.
format	article
author	Amin Babaei-Ghazvini Bishnu Acharya
author_facet	Amin Babaei-Ghazvini Bishnu Acharya
author_sort	Amin Babaei-Ghazvini
title	Humidity-Responsive Photonic Films and Coatings Based on Tuned Cellulose Nanocrystals/Glycerol/Polyethylene Glycol
title_short	Humidity-Responsive Photonic Films and Coatings Based on Tuned Cellulose Nanocrystals/Glycerol/Polyethylene Glycol
title_full	Humidity-Responsive Photonic Films and Coatings Based on Tuned Cellulose Nanocrystals/Glycerol/Polyethylene Glycol
title_fullStr	Humidity-Responsive Photonic Films and Coatings Based on Tuned Cellulose Nanocrystals/Glycerol/Polyethylene Glycol
title_full_unstemmed	Humidity-Responsive Photonic Films and Coatings Based on Tuned Cellulose Nanocrystals/Glycerol/Polyethylene Glycol
title_sort	humidity-responsive photonic films and coatings based on tuned cellulose nanocrystals/glycerol/polyethylene glycol
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/37b823f23aaf44d5832cb4b347a3d6ec
work_keys_str_mv	AT aminbabaeighazvini humidityresponsivephotonicfilmsandcoatingsbasedontunedcellulosenanocrystalsglycerolpolyethyleneglycol AT bishnuacharya humidityresponsivephotonicfilmsandcoatingsbasedontunedcellulosenanocrystalsglycerolpolyethyleneglycol
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Humidity-Responsive Photonic Films and Coatings Based on Tuned Cellulose Nanocrystals/Glycerol/Polyethylene Glycol

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