Piezoelectric Effect of Cellulose Nanocrystals Thin Films

Csóka, Levente; Hoeger, Ingrid C.; Rojas, Orlando J.; Peszlen, Ilona; Pawlak, Joel J.; Peralta, Perry N.

doi:10.1021/mz300234a

Cited by 184 publications

(137 citation statements)

References 30 publications

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“…However, the case is different for cellulose systems at the nanoscale. There are recent experimental evidences indicating that the orientation of CNC crystals has a significant effect on the overall piezoelectric response 12 , and that CNC has a permanent dipole momentum 14 . It was also suggested that regenerated CNC (cellulose II) has the apparent piezoelectric coefficient on the range pC/N 13 .…”

Section: Piezoelectric Sensitivity Of Cnf Filmsmentioning

confidence: 99%

“…The poling procedure, in general, consists of applying an electric field on a processed film for a certain period of time in order to generate piezoelectric properties. The poling (or other type orientation) of the CNF film should lead to the polarization of the crystalline CNC regions inside the CNF film, further leading to a remarkable increase of piezoelectric effect due to the large piezoelectric coefficient of the crystalline components 12,14 . In comparison, a sensitivity of about 27.5 pC/N was obtained here for a sensor made from a polarized 28-µm-thick PVDF film 29 .…”

Section: Piezoelectric Sensitivity Of Cnf Filmsmentioning

confidence: 99%

“…The piezoelectric effect is highly enhanced if one considers the isolated crystalline building blocks of wood, namely cellulose nanocrystals (CNC) 12,13 . However, related issues has been covered in the scientific literature to a very limited extent and only few recent reports discuss experimental evidence of CNC piezoelectricity 12,14 .…”

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confidence: 99%

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Cellulose Nanofibril Film as a Piezoelectric Sensor Material

Rajala

Siponkoski

Sarlin

et al. 2016

ACS Appl. Mater. Interfaces

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231

176

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Self-standing films (45-μm thick) of native cellulose nanofibrils (CNF) were synthesized and characterized for their piezoelectric response. The surface and the microstructure of the films were evaluated with image-based analysis and scanning electron microscopy (SEM). The measured dielectric properties of the films at 1 kHz and 9.97 GHz indicated a relative permittivity of 3.47 and 3.38 and loss tangent tan  of 0.011 and 0.071, respectively. The films were used as functional sensing layers in piezoelectric sensors with corresponding sensitivities of 4.7 to 6.4 pC/N in ambient conditions. This piezoelectric response is expected to increase remarkably upon film polarization resulting from the alignment of the cellulose crystalline regions in the film. The CNF sensor characteristics were compared with those of polyvinylidene fluoride (PVDF) as reference piezoelectric polymer. Overall, the results suggest that CNF is a suitable precursor material for disposable piezoelectric sensors, actuator or energy generators with potential applications in the fields of electronics, sensors and biomedical diagnostics.

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Section: Piezoelectric Sensitivity Of Cnf Filmsmentioning

confidence: 99%

Section: Piezoelectric Sensitivity Of Cnf Filmsmentioning

confidence: 99%

See 1 more Smart Citation

Cellulose Nanofibril Film as a Piezoelectric Sensor Material

Rajala

Siponkoski

Sarlin

et al. 2016

ACS Appl. Mater. Interfaces

Self Cite

231

176

View full text Add to dashboard Cite

show abstract

“…Copyright 2013 American Chemical Society. [36,37]. In the case of poly-L-lactic acid (PLLA), there are four known crystal phases (α′, α, β and γ) based around a helical conformation of the polymer chain.…”

Section: Piezoelectric Polymersmentioning

confidence: 99%

Nanostructured polymer-based piezoelectric and triboelectric materials and devices for energy harvesting applications

Jing

Kar‐Narayan

2018

J. Phys. D: Appl. Phys.

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Harvesting energy from ambient mechanical sources in our environment has attracted considerable interest due to its potential to power applications such as ubiquitous wireless sensors and Internet of Things devices. In this context, piezoelectric and/or triboelectric materials offer a relatively simple means of directly converting mechanical energy from ubiquitous ambient vibrating sources into electrical power for microscale/nanoscale device applications. In particular, nanoscale energy harvesters, or nanogenerators, are capable of converting low-level ambient vibrations into electrical energy, thus are vital to the realization of the next generation of self-powered devices. Polymer-based nanogenerators are attractive as they are inherently flexible and robust, making them less prone to mechanical failure which is a key requirement for vibrational energy harvesters. They are also lightweight, easy and cheap to fabricate, lead-free and biocompatible, but in many cases their energy harvesting performance is found lacking in comparison to more commonly studied inorganic materials. Recent advances have been made in developing scalable nanofabrication techniques for flexible and low-cost polymer-based nanogenerators with improved energy conversion efficiency, including the incorporation of high-quality polymer nanowires with enhanced crystallinity, piezoelectric and/or surface charge properties. In this review, we discuss aspects of nanomaterials growth and energy harvester device design, including those involving nanowires of polymers of polyvinylidene fluoride and its co-polymers, nylon-11, and poly-lactic acid for scalable piezoelectric and triboelectric nanogenerator applications, as well as the design and performance of polymer-ceramic nanocomposite nanogenerators. In particular, we highlight the effects of growth parameters, nanoconfinement, self-poling, surface polarization, crystalline phases, and device assembly on the energy harvesting performance of a range of recently reported nanostructured polymer-based materials and devices.

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“…9,18,[23][24][25][26][27][28][29] In addition to their high aspect ratio and large surface area, CNCs have unique physical properties, such as their ability to self-assemble into chiral nematic liquid crystalline phases, [30][31][32][33] align in magnetic [34][35][36][37][38][39] and electric fields, [40][41][42] and exhibit piezoelectric reponsivity. 43 Our work on CNCs has primarily focused on developing hybrid nanomaterials such as films, aerogels, and liquid formulated products. We often play on the synergy between auto-adhering polymers and surfactants with CNCs which enables superior stabilization and enhanced mechanical properties in emulsions, gels and foams.…”

mentioning

confidence: 99%

Benchmarking Cellulose Nanocrystals: From the Laboratory to Industrial Production

2016

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Abstract:The renewability, biocompatibility and mechanical properties of cellulose nanocrystals (CNCs) have made them an attractive material for numerous composite, biomedical and rheological applications. However, for CNCs to shift from laboratory curiosity to commercial applications, researchers must transition from CNCs extracted at the bench scale to material produced at an industrial scale. There are a number of companies currently producing kilogram to ton per day quantities of sulfuric acid-hydrolyzed CNCs, as well as other nanocelluloses, as described herein.With the recent intensification of industrially produced CNCs, the variety of cellulose sources, hydrolysis methods and purification procedures, characterization of these materials becomes critical. This has further been justified by the past two decades of research which demonstrate that CNC stability and behaviour is highly dependent on surface chemistry, surface charge density and particle size. This work outlines key test methods that should be employed to characterize these properties to ensure a "known" starting material and consistent performance.Of the sulfuric acid-extracted CNCs examined, industrially produced material compared well with laboratory-made CNCs, exhibiting similar charge density, colloidal and thermal stability, crystallinity, morphology and self-assembly behaviour. In addition, it was observed that further purification of CNCs, using Soxhlet extraction in ethanol, had minimal impact on nanoparticle properties and is unlikely to be necessary for many applications. Overall the current standing of industrially produced CNCs is positive suggesting that the evolution to commercial scale applications will not be hindered by CNC production.

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Piezoelectric Effect of Cellulose Nanocrystals Thin Films

Cited by 184 publications

References 30 publications

Cellulose Nanofibril Film as a Piezoelectric Sensor Material

Cellulose Nanofibril Film as a Piezoelectric Sensor Material

Nanostructured polymer-based piezoelectric and triboelectric materials and devices for energy harvesting applications

Benchmarking Cellulose Nanocrystals: From the Laboratory to Industrial Production

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