Responsive and patterned cellulose nanocrystal films modified by N-methylmorpholine-N-oxide

Zhang, Yu; Tian, Zhongjian; Fu, Yingjuan; Wang, Zhaojiang; Qin, Menghua; Yuan, Zaiwu

doi:10.1016/j.carbpol.2019.115387

Cited by 47 publications

(26 citation statements)

References 49 publications

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“…In the case of the PAAc/PAAm/CNC2 hydrogel, it can be observed that the curve exhibits a single glass transition temperature located at 210 °C, which is approximately between To detect the structural changes between pure CNCs and the hybrid hydrogels, the XRD patterns are shown in Figure 1b. For pure CNCs, typical cellulose I crystalline peaks at 14.9 • , 16.4 • , 22.8 • , and 34.4 • were observed [33][34][35]. Compared to the PAAc-co-PAAm hydrogel, the PAAc/PAAm/CNC 2 hydrogel exhibited the characteristic diffraction peak of CNCs at 22.8 • , although the strength of the peak was slightly lower.…”

Section: Preparation and Characterization Of The Paac/paam/cnc Hydrogelsmentioning

confidence: 95%

Multiresponsive Cellulose Nanocrystal Cross-Linked Copolymer Hydrogels for the Controlled Release of Dyes and Drugs

et al. 2021

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Multiresponsive hydrogels have attracted tremendous interest due to their promising applications in tissue engineering, wearable devices, and flexible electronics. In this work, we report a multiresponsive upper critical solution temperature (UCST) composite hydrogel based on poly (acrylic acid-co-acrylamide), PAAc-co-PAAm, sequentially cross-linked by acid-hydrolysis cellulose nanocrystals (CNCs). Scanning electron microscopy (SEM) observations demonstrated that the hydrogels are formed by densely cross-linked porous structures. The PAAc/PAAm/CNC hybrid hydrogels exhibit swelling and shrinking properties that can be induced by multiple stimuli, including temperature, pH, and salt concentration. The driving force of the volume transition is the formation and dissociation of hydrogen bonds in the hydrogels. A certain content of CNCs can greatly enhance the shrinkage capability and mechanical strength of the hybrid hydrogels, but an excess addition may impair the contractility of the hydrogel. Furthermore, the hydrogels can be used as a matrix to adsorb dyes, such as methylene blue (MB), for water purification. MB may be partly discharged from hydrogels by saline solutions, especially by those with high ionic strength. Notably, through temperature-controlled hydrogel swelling and shrinking, doxorubicin hydrochloride (DOX-HCl) can be controllably adsorbed and released from the prepared hydrogels.

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Section: Preparation and Characterization Of The Paac/paam/cnc Hydrogelsmentioning

confidence: 95%

Multiresponsive Cellulose Nanocrystal Cross-Linked Copolymer Hydrogels for the Controlled Release of Dyes and Drugs

et al. 2021

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“…[56,332,333] In this sub-section, we provide a few examples of sensors based on chiral nematic CNCs films. These chiral nematic CNC sensors can be produced by CNC without further modification, [334] with modification, [335] or in the presence of different stabilizing molecules. The reader is referred to excellent recent reviews on the production of chiral nematic CNC films and their main applications.…”

Section: Cellulosic Materials That Change Color Upon External Stimulusmentioning

confidence: 99%

“…To improve response time, a different approach was developed based on the treatment of structurally colored CNC films with solvents such as N-methyl morpholine-N-oxide (NMMO). [335] It was possible to tune the color and hygroscopicity of the NMMO-treated films to give a faster response time (<2 min). [326] Copyright 2018, Wiley-VCH.…”

Section: Cellulosic Materials That Change Color Upon External Stimulusmentioning

confidence: 99%

“…Also, with increasing NMMO contents and relative humidity, the response time and H 2 O adsorption capacity improved such that the system could be applied as a humidity indicator label (Figure 11a). [335] Another approach involved functionalizing CNC film surfaces with 3-aminopropyltriethoxysilane (APTES) to detect formaldehyde or propanol vapors. [339] CNC structural colors remained intact after film immersion in a solution of APTES dissolved in toluene (60°C, 1 h) and drying (1 h, 120°C).…”

Section: Cellulosic Materials That Change Color Upon External Stimulusmentioning

confidence: 99%

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Plant‐Based Structures as an Opportunity to Engineer Optical Functions in Next‐Generation Light Management

et al. 2021

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This review addresses the reconstruction of structural plant components (cellulose, lignin, and hemicelluloses) into materials displaying advanced optical properties. The strategies to isolate the main building blocks are discussed, and the effects of fibrillation, fibril alignment, densification, self‐assembly, surface‐patterning, and compositing are presented considering their role in engineering optical performance. Then, key elements that enable lignocellulosic to be translated into materials that present optical functionality, such as transparency, haze, reflectance, UV‐blocking, luminescence, and structural colors, are described. Mapping the optical landscape that is accessible from lignocellulosics is shown as an essential step toward their utilization in smart devices. Advanced materials built from sustainable resources, including those obtained from industrial or agricultural side streams, demonstrate enormous promise in optoelectronics due to their potentially lower cost, while meeting or even exceeding current demands in performance. The requirements are summarized for the production and application of plant‐based optically functional materials in different smart material applications and the review is concluded with a perspective about this active field of knowledge.

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“…The traditional cellulose dissolution viscose process, developed over 100 years ago, is widely used for regenerated cellulose (Wang et al 2016). More recently, some new solvent systems have successfully been developed to dissolve cellulose, which include Nmethylmorpholine-N-oxide (NMMO) (Zhang et al 2020), ionic liquids (ILs) (Zhang et al 2019), LiCl/N,N-dimethylacetamide (LiCl/DMAc) (Ono et al 2016), H2SO4 aqueous solution (Huang et al 2016), NaOH aqueous solution (Korhonen and Budtova 2019), and NaOH/urea aqueous solution (Cai and Zhang 2005).…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of self-reinforced paper using NaOH/thiourea aqueous solution at room temperature

Zhang

et al. 2020

BioRes

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The aim of this paper was to enhance paper strength in NaOH/thiourea aqueous solution at room temperature. Paper from cotton pulp was saturated with room temperature NaOH/thiourea aqueous solution and placed at a fixed temperature (8, 15, and 20 °C) for a period of time (1 h, 2 h, 4 h, and 6 h). The morphology, X-ray diffraction (XRD), mechanical properties, and density of paper were characterized. The results indicated the paper was self-reinforced. Scanning electron microscopy (SEM) photographs indicated that the structure of the treated papers was increasingly compact with decreasing temperature. The XRD results showed that the crystallinity degree of the paper decreased from 80.0% to 60.0%. The stress at break of the treated papers increased by more than fivefold. The wet tensile strength of the treated papers increased remarkably.

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Responsive and patterned cellulose nanocrystal films modified by N-methylmorpholine-N-oxide

Cited by 47 publications

References 49 publications

Multiresponsive Cellulose Nanocrystal Cross-Linked Copolymer Hydrogels for the Controlled Release of Dyes and Drugs

Multiresponsive Cellulose Nanocrystal Cross-Linked Copolymer Hydrogels for the Controlled Release of Dyes and Drugs

Plant‐Based Structures as an Opportunity to Engineer Optical Functions in Next‐Generation Light Management

Preparation and characterization of self-reinforced paper using NaOH/thiourea aqueous solution at room temperature

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