Specific features of the electrical properties in partially graphitized porous biocarbons of beech wood

Popov, V. V.; Orlova, T. S.; Gutiérrez‐Pardo, A.; Ramírez‐Rico, J.

doi:10.1134/s1063783415090280

Cited by 7 publications

(4 citation statements)

References 33 publications

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“…As the pyrolysis temperature is increased, both thermal and electrical conductivity increase, suggesting a higher degree of crystalline ordering in materials pyrolyzed at higher temperatures. It has been shown in wood-derived porous carbons that increasing pyrolysis temperature increases the degree of crystalline long-range ordering, both when catalysts are used to promote graphitization [24,30,[36][37][38][55][56][57][58] but also when they are not [29,53,[59][60][61], by increasing the size of the graphitic regions in the turbostratic carbon layers (increasing crystallite size). In the case of Ni-catalyzed samples, the precipitation of large, micron sized graphite crystals has been observed [24,37] by transmission electron diffraction, even if they are absent in Fe-catalyzed samples.…”

Section: Thermal Conductivitymentioning

confidence: 99%

Thermal conductivity of Fe graphitized wood derived carbon

et al. 2016

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Graphitic porous carbon materials from pyrolysis of wood precursors were obtained by means of a nanosized Fe catalyst, and their microstructure and electrical and thermal transport properties investigated. Thermal and electrical conductivity of graphitized carbon materials increase with the pyrolysis temperature, indicating a relationship between the degree of graphitization and thus in crystallite size with transport properties in the resulting carbon scaffolds. Evaluation of the experimental results indicate that thermal conductivity is mainly through phonons and decreases with the temperature in Fe-catalyzed carbons suggesting that due to defect scattering the mean free path of phonons in the material is small and defect scattering dominates over phonon-phonon interactions in the range from room temperature to 800ºC.

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Section: Thermal Conductivitymentioning

confidence: 99%

Thermal conductivity of Fe graphitized wood derived carbon

et al. 2016

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“…A significant reduction in the electrical resistance of ash wood, plywood, and particleboard due to carbonization at temperatures between 400 and 1100°C was observed 7 . It has also been shown that carbonizing beech wood and fiberboard at 600–1000°C can be associated with a reduction in electrical resistivity of five or six orders of magnitude 8,9 . It has also been demonstrated that graphitizing of the wood structure at 2400°C can significantly increase the electrical conductivity 10 .…”

Section: Introductionmentioning

confidence: 95%

“…7 It has also been shown that carbonizing beech wood and fiberboard at 600-1000 C can be associated with a reduction in electrical resistivity of five or six orders of magnitude. 8,9 It has also been demonstrated that graphitizing of the wood structure at 2400 C can significantly increase the electrical conductivity. 10 Significant changes in the atomic configuration of the wood microstructure caused the wood to change from an electrical insulator to an electrical conductor at 800 C or above.…”

Section: Introductionmentioning

confidence: 99%

Development of electrically conductive wood‐based composites using carbon nets

Rezanezhad,

Shalbafan,

Thoemen

2023

Polymer Composites

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A novel conductive composite material was developed using woven carbon nets. For this purpose, carbon nets with different mesh sizes of 25, 100, 225, and 400 mm2 were woven, using two different carbon yarns with widths of 2 and 0.5 mm. The woven carbon nets were used before and after the core layer formation during mat forming of the particleboard. It was found that the insertion of carbon nets into the panel structure not only transforms insulated particleboard into a highly conductive composite but also significantly improves the flexural properties of the composite. However, the internal bond strength and physical properties of the composites were negatively affected by the presence of carbon nets in the panel structure, although their values were still above the minimum requirements of the standard values. Increasing the mesh area of the carbon nets and using thinner carbon yarns to weave the nets had a negative effect on the electrical and mechanical properties of the composites. In addition, a demonstration object was made of conductive composites to integrate lighting and a smartphone charging port into the object and prove the applicability of the developed composites for the furniture industry.Highlights Composites with carbon nets with smaller mesh area showed higher conductivity. The smaller the width of the carbon yarn, the higher the electrical resistance. The carbon net in the composites led to a decrease in internal bond strength. The carbon nets improved the flexural properties of the composites. Thickness swelling was significantly reduced by the use of carbon nets.

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“…Recent studies have shown that the bulk graphite phase can be introduced into biocarbon materials carbonized from natural wood, if a catalyst based on transition metals (Ni or Fe) is used in the carbonization process [19][20][21][22]. The elastic, microplastic, strength [23,24], and electrotransport properties [25] of the partially graphitized carbon obtained by carbonizing beech wood in the presence of a Ni-based catalyst have been studied previously.…”

Section: Thermal Propertiesmentioning

confidence: 99%

Thermal conductivity of partially graphitized biocarbon obtained by carbonization of medium-density fiberboard in the presence of a Ni-based catalyst

et al. 2016

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The thermal conductivity k and resistivity ρ of biocarbon matrices, prepared by carbonizing medium-density fiberboard at T carb = 850 and 1500°C in the presence of a Ni-based catalyst (samples MDF-C(Ni)) and without a catalyst (samples MDF-C), have been measured for the first time in the temperature range of 5-300 K. X-ray diffraction analysis has revealed that the bulk graphite phase arises only at T carb = 1500°C. It has been shown that the temperature dependences of the thermal conductivity of samples MDF-C-850 and MDF-C-850(Ni) in the range of 80-300 K are to each other and follow the law of k(T) ~ T 1.65 , but the use of the Ni-catalyst leads to an increase in the thermal conductivity by a factor of approximately 1.5, due to the formation of a greater fraction of the nanocrystalline phase in the presence of the Ni-catalyst at T carb = 850°C. In biocarbon MDF-C-1500 prepared without a catalyst, the dependence is k(T) ~ T 1.65 , and it is controlled by the nanocrystalline phase. In MDF-C-1500(Ni), the bulk graphite phase formed increases the thermal conductivity by a factor of 1.5-2 compared to the thermal conductivity of MDF-C-1500 in the entire temperature range of 5-300 K; k(T = 300 K) reaches the values of ~10 W m-1 K-1 , characteristic of biocarbon obtained without a catalyst only at high temperatures of T carb = 2400°C. It has been shown that MDF-C-1500(Ni) in the temperature range of 40-300 K is characterized by the dependence, k(T) ~ T 1.3 , which can be described in terms of the model of partially graphitized biocarbon as a composite of an amorphous matrix with spherical inclusions of the graphite phase.

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Specific features of the electrical properties in partially graphitized porous biocarbons of beech wood

Cited by 7 publications

References 33 publications

Thermal conductivity of Fe graphitized wood derived carbon

Thermal conductivity of Fe graphitized wood derived carbon

Development of electrically conductive wood‐based composites using carbon nets

Thermal conductivity of partially graphitized biocarbon obtained by carbonization of medium-density fiberboard in the presence of a Ni-based catalyst

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