Cellulose- and nanocellulose-based dielectric materials

Tao, Jie; Ji, Liang; Deng, Yulin

doi:10.1016/b978-0-12-822350-5.00004-7

Cited by 7 publications

(2 citation statements)

References 107 publications

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“…Hence, we cannot calculate the d 33 of CNF films in the same way as for P(VDF-TrFE). Instead, the previously reported dielectric constant of the cellulose nanofiber (ε r = 10) − is used to calculate the piezoelectric coefficient ( d 33 ) of the CNF devices. As shown in Figure f, most of the CNF samples have d 33 in the range between 35 and 55 pC N –1 , which is close to the value obtained from PFM (indicated by the green solid line).…”

Section: Resultsmentioning

confidence: 99%

Toward High-Performance Green Piezoelectric Generators Based on Electrochemically Poled Nanocellulose

et al. 2023

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Internet-of-Everything (IoE) is defined as networked connections of things, people, data, and processes. IoE nodes, preferably shaped as printed flexible systems, serve as the frontier outpost of the Internet and comprise devices to record and regulate states and functions. To power distributed IoE nodes in an ecofriendly manner, a technology to scavenge energy from ambience and self-powered devices is developed. For this, piezoelectricity is regarded as a key property; however, the current technology typically based on polyvinylidene difluoride (PVDF) copolymers is expensive and produced via toxic protocols. We report piezoelectric characteristics of electrochemically poled cellulose nanofiber (CNF) thin films processed from water dispersions. Poling these films under humid conditions causes breaking and reorientation of CNF segments, which results in enhanced crystal alignment rendering the resulting material piezoelectric. Generators based on poled CNF show similar piezoelectric voltage and coefficient, here measured as d 33 = 46 pm V–1, to devices including PVDF copolymer layers of similar thickness. Our findings promise low-cost and printable ecofriendly piezoelectric-powered IoE nodes.

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Section: Resultsmentioning

confidence: 99%

Toward High-Performance Green Piezoelectric Generators Based on Electrochemically Poled Nanocellulose

et al. 2023

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“…In addition to nanocellulose materials applied as ionic conductors, cellulosic materials have long been used in electrical insulators, oil-filled power transformers, and paper-insulated power cables due to their excellent breakdown strength and resistivity. 204 The dielectric properties of materials are significantly affected by the frequency, temperature, moisture, and density. Oil impregnation is commonly used to reduce moisture adsorption and remove air to enhance the dielectric properties of the insulation paper.…”

Section: Excess Water Vs Lacking Watermentioning

confidence: 99%

The Critical Roles of Water in the Processing, Structure, and Properties of Nanocellulose

Jing,

Wu,

Siciliano

et al. 2023

ACS Nano

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The cellulose industry depends heavily on water owing to the hydrophilic nature of cellulose fibrils and its potential for sustainable and innovative production methods. The emergence of nanocellulose, with its excellent properties, and the incorporation of nanomaterials have garnered significant attention. At the nanoscale level, nanocellulose offers a higher exposure of hydroxyl groups, making it more intimate with water than micro-and macroscale cellulose fibers. Gaining a deeper understanding of the interaction between nanocellulose and water holds the potential to reduce production costs and provide valuable insights into designing functional nanocellulosebased materials. In this review, water molecules interacting with nanocellulose are classified into free water (FW) and bound water (BW), based on their interaction forces with surface hydroxyls and their mobility in different states. In addition, the waterholding capacity of cellulosic materials and various water detection methods are also discussed. The review also examines water-utilization and water-removal methods in the fabrication, dispersion, and transport of nanocellulose, aiming to elucidate the challenges and tradeoffs in these processes while minimizing energy and time costs. Furthermore, the influence of water on nanocellulose properties, including mechanical properties, ion conductivity, and biodegradability, are discussed. Finally, we provide our perspective on the challenges and opportunities in developing nanocellulose and its interplay with water.

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