Fabrication of environmental humidity-responsive iridescent films with cellulose nanocrystal/polyols

Meng, Yahui; Cao, Ya; Ji, Hairui; Chen, Jie; He, Zhibin; Long, Zhu; Dong, Chune

doi:10.1016/j.carbpol.2020.116281

Cited by 55 publications

(30 citation statements)

References 40 publications

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“…Therefore, some new methods, such as enzymatic hydrolysis, oxidization, as well as the ionic liquid hydrolysis are also implemented to prepare CNCs in the context of environmental protection. [ 129‐132 ]…”

Section: Preparation Of Mofs Cellulose Derivatives and Mof@cellulose Hybridsmentioning

confidence: 99%

Recent Progress in Metal‐Organic Frameworks@Cellulose Hybrids and Their Applications

et al. 2021

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In recent years, metal‐organic frameworks (MOFs) are attracting increasing attention due to their charming properties. However, the intrinsic fragility, powdered crystalline state, and poor processibility of MOFs hinder their further application. By this, the designs of MOF‐based aerogels, hydrogels, membranes are effective ways to solve this problem. Graphene, silica, synthetic polymer and cellulose are the commonly used raw materials for fabricating MOF‐based aerogels, hydrogels, and membranes. Among them, cellulose and its derivatives are the best candidates to support the powdered MOFs from the perspectives of economy, environmental protection and property. This review focuses on discussing the advantages of MOF@cellulose hybrids in applications such as water treatment, antibacterial, gas separation and adsorption, energy storage, drug delivery, catalysis, and other smart composites. MOF@cellulose‐based aerogels, hydrogels and membranes can provide valuable guidance for investigating the practical application of MOFs in terms of processability, reusability, stability and easiness in handling.

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Section: Preparation Of Mofs Cellulose Derivatives and Mof@cellulose Hybridsmentioning

confidence: 99%

Recent Progress in Metal‐Organic Frameworks@Cellulose Hybrids and Their Applications

et al. 2021

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“…The humidity response of CNC-based ChLC gels is an active area of research [73][74][75][76][77]. The substantial hydrophilicity and useful coloration properties of CNC-based ChLCs are suitable for achieving a humidity response.…”

Section: Humidity-responsive Color Gelsmentioning

confidence: 99%

Construction of Functional Materials in Various Material Forms from Cellulosic Cholesteric Liquid Crystals

Miyagi

Teramoto

2021

Nanomaterials

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Wide use of bio-based polymers could play a key role in facilitating a more sustainable society because such polymers are renewable and ecofriendly. Cellulose is a representative bio-based polymer and has been used in various materials. To further expand the application of cellulose, it is crucial to develop functional materials utilizing cellulosic physicochemical properties that are acknowledged but insufficiently applied. Cellulose derivatives and cellulose nanocrystals exhibit a cholesteric liquid crystal (ChLC) property based on rigidity and chirality, and this property is promising for constructing next-generation functional materials. The form of such materials is an important factor because material form is closely related with function. To date, researchers have reported cellulosic ChLC materials with a wide range of material forms—such as films, gels, mesoporous materials, and emulsions—for diverse functions. We first briefly review the fundamental aspects of cellulosic ChLCs. Then we comprehensively review research on cellulosic ChLC functional materials in terms of their material forms. Thus, this review provides insights into the creation of novel cellulosic ChLC functional materials based on material form designed toward the expanded application of cellulosics.

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“…Typically, the formation of a chiral-nematic structure during the CNC film-making process is impacted by electrostatic repulsions and van der Waals forces on the surface of the nanocrystals [16]. Changing the physicochemical features of the chiral nematic structure, such as pitch, can change the photonic properties of the CNC films due to change in the refraction index of the photonic structure; for example, ultrasonic treatment [17], addition of electrolytes [18], electromagnetic field exposure [19,20], evaporation rate [21], and co-assembly with water-soluble polymers or compounds [22][23][24][25][26][27], are some of the most studied methods in this field. The structural colors reflected by the chiral nematic CNCs resulted from self-assembly is entirely "green".…”

Section: Introductionmentioning

confidence: 99%

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

Babaei-Ghazvini

Acharya

2021

Polymers

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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.

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Fabrication of environmental humidity-responsive iridescent films with cellulose nanocrystal/polyols

Cited by 55 publications

References 40 publications

Recent Progress in Metal‐Organic Frameworks@Cellulose Hybrids and Their Applications

Recent Progress in Metal‐Organic Frameworks@Cellulose Hybrids and Their Applications

Construction of Functional Materials in Various Material Forms from Cellulosic Cholesteric Liquid Crystals

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

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