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

The development of responsive composite materials is among the most interesting challenges in contemporary material science and technology. Nevertheless, the use of highly expensive nanostructured fillers has slowed down the spread of these smart materials in several key productive sectors. Here, we...

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Published inMicromachines (Basel) Vol. 13; no. 1; p. 125
Main Authors Bartoli, Mattia, Torsello, Daniele, Piatti, Erik, Giorcelli, Mauro, Sparavigna, Amelia Carolina, Rovere, Massimo, Ghigo, Gianluca, Tagliaferro, Alberto
Format Journal Article
LanguageEnglish
Published Switzerland MDPI AG 13.01.2022
MDPI
Subjects
biochar
Carbon
Cellulose
Charge materials
Charge transport
Composite materials
conductive composites
Cotton
Cotton fibers
Electromagnetic properties
Fillers
Graphene
Microscopy
microwave
Morphology
piezoresistive
Polyvinyl alcohol
PVA
Smart materials
Spectrum analysis
United Kingdom > UK
United States > US
Germany
piezoresistive
PVA
conductive composites
biochar
microwave
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Summary:The development of responsive composite materials is among the most interesting challenges in contemporary material science and technology. Nevertheless, the use of highly expensive nanostructured fillers has slowed down the spread of these smart materials in several key productive sectors. Here, we propose a new piezoresistive PVA composite containing a cheap, conductive, waste-derived, cotton biochar. We evaluated the electromagnetic properties of the composites under both AC and DC regimes and as a function of applied pressure, showing promisingly high conductivity values by using over 20 wt.% filler loading. We also measured the conductivity of the waste cotton biochar from 20 K up to 350 K observing, for the first time, hopping charge transport in biochar materials.
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ISSN:2072-666X
2072-666X
DOI:10.3390/mi13010125