Pressure-Responsive Conductive Poly(vinyl alcohol) Composites Containing Waste Cotton Fibers Biochar

Bartoli, Mattia; Torsello, Daniele; Piatti, Erik; Giorcelli, Mauro; Sparavigna, Amelia Carolina; Rovere, Massimo; Ghigo, Gianluca; Tagliaferro, Alberto

doi:10.3390/mi13010125

Cited by 13 publications

(12 citation statements)

References 55 publications

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“…This decrease indicated that the applied pressure induced the film deformation, and this feature was responsible for the formation of a higher number of conductive paths, which increase the conductivity. Similar results were achieved by Bartoli et al [110], who dispersed biochar derived from waste cotton into PVA, achieving a conductivity of up to 16 S/m under a pressure of 750 bar.…”

Section: Other Thermoplastic-based Compositessupporting

confidence: 86%

Recent Advances in Biochar Polymer Composites

et al. 2022

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“Biochar” (BC) is the solid residue recovered from the thermal cracking of biomasses in an oxygen-poor atmosphere. Recently, BC has been increasingly explored as a sustainable, inexpensive, and viable alternative to traditional carbonaceous fillers for the development of polymer-based composites. In fact, BC exhibits high thermal stability, high surface area, and electrical conductivity; moreover, its main properties can be properly tuned by controlling the conditions of the production process. Due to its intriguing characteristics, BC is currently in competition with high-performing fillers in the formulation of multi-functional polymer-based composites, inducing both high mechanical and electrical properties. Moreover, BC can be derived from a huge variety of biomass sources, including post-consumer agricultural wastes, hence providing an interesting opportunity toward a “zero waste” circular bioeconomy. This work aims at providing a comprehensive overview of the main achievements obtained by combining BC with several thermoplastic and thermosetting matrices. In particular, the effect of the introduction of BC on the overall performance of different polymer matrices will be critically reviewed, highlighting the influence of differently synthesized BC on the final performance and behavior of the resulting composites. Lastly, a comparative perspective on BC with other carbonaceous fillers will be also provided.

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Section: Other Thermoplastic-based Compositessupporting

confidence: 86%

Recent Advances in Biochar Polymer Composites

et al. 2022

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“…The observed conductivity values are comparable with those reported for loading exceeding 15 wt% of coffee-derived biochar dispersed into an epoxy matrix [24], but considerably lower compared to cotton-derived biochar fibers produced at 1000 °C and dispersed into poly(vinyl alcohol) [23]. The improvement upon coffee-derived biochar is reasonably due to the aspect ratio of the HFB that allowed to reach percolation threshold in a more effective way.…”

Section: Characterization Of Epoxy/hemp Fiber Biochar Compositessupporting

confidence: 79%

“…As shown in Fig. 3b, W is constant at low T and it mildly increases at higher T, whereas W would decrease with increasing T in hopping-type transport-as so far observed in biochars derived from the pyrolysis of cotton fibers only [23]. In agreement with Pukha et al [45], we therefore exclude charge-carrier hopping as a significant source of conductivity in HFB and ascribe its dominant DC electric transport mechanism to direct tunneling between graphite nanocrystals across sp 3 boundaries.…”

Section: Characterization Of Hfbsupporting

confidence: 61%

“…It is well known that the impact of carbonaceous materials produced from pyrolysis (known as biochars) in different applications has been growing in recent years [20,21]. Furthermore, despite biochar high production temperatures [22] and high filler loading [23] necessary for affecting the bulk properties of the matrix (usually beyond 20 wt%) [24]), it has been proved to be a valuable choice for the production of conductive epoxy composites [25] with performances comparable to those achieved by the incorporation of carbon nanotubes [26]. The clear advantage of the biochar as compared to the petroleum-based carbon filler for composites fabrication is its waste utilization and re-use resources which aids the circular economy, sustainability and reduction of environmental footprint [27].…”

Section: Graphical Abstract Introductionmentioning

confidence: 99%

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Mechanical, electrical, thermal and tribological behavior of epoxy resin composites reinforced with waste hemp-derived carbon fibers

Bartoli

Duraccio²,

Faga³

et al. 2022

J Mater Sci

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Short hemp fibers, an agricultural waste, were used for producing biochar by pyrolysis at 1000 °C. The so-obtained hemp-derived carbon fibers (HFB) were used as filler for improving the properties of an epoxy resin using a simple casting and curing process. The addition of HFB in the epoxy matrix increases the storage modulus while damping factor is lowered. Also, the incorporation of HFB induces a remarkable increment of electrical conductivity reaching up to 6 mS/m with 10 wt% of loading. A similar trend is also observed during high-frequency measurements. Furthermore, for the first time wear of these composites has been studied. The use of HFB is an efficient method for reducing the wear rate resistance and the friction coefficient (COF) of the epoxy resin. Excellent results are obtained for the composite containing 2.5 wt% of HFB, for which COF and wear rate decrease by 21% and 80%, respectively, as compared with those of the unfilled epoxy resin. The overall results prove how a common waste carbon source can significantly wide epoxy resin applications by a proper modulation of its electrical and wear properties. Graphical abstract

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“…Journal of Nanomaterials their increased functionality, controllability, and biocompatibility [12][13][14][15][16].…”

Section: Two-dimensional Smart Membrane Advancementmentioning

confidence: 99%

Recent Developments in Stimuli Responsive Smart Materials and Applications: An Overview

Ramakrishnan¹,

Kumar²,

Chelladurai³

et al. 2022

Journal of Nanomaterials

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The term “smart materials” can be used to refer a wide variety of different kinds of substances. One capacity that is shared by all of them is the capability to radically alter one or more aspects while operating inside carefully controlled conditions. The age of intelligent materials is arrived, and we are living in it right now. An older definition of smart material described it as a substance that responds swiftly to the environment in which it is located. It has been argued that the word “smart material” now refers to any substance that is capable of detecting, transmitting, or processing a stimulus in order to produce a beneficial effect. This idea has been put forward as a possible expansion of the original meaning of the term. The purpose of this research is to define and categorize different types of intelligent materials. Uses of smart materials are being contemplated in a wide variety of domains, spanning from the realm of technology to that of the modern environment.

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Pressure-Responsive Conductive Poly(vinyl alcohol) Composites Containing Waste Cotton Fibers Biochar

Cited by 13 publications

References 55 publications

Recent Advances in Biochar Polymer Composites

Recent Advances in Biochar Polymer Composites

Mechanical, electrical, thermal and tribological behavior of epoxy resin composites reinforced with waste hemp-derived carbon fibers

Recent Developments in Stimuli Responsive Smart Materials and Applications: An Overview

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