The Study on the Preparation of Expanded Graphite by Fine Squama Graphite

Li, Min Jie; Lai, Qi; Li, Yu Feng

doi:10.4028/www.scientific.net/amr.113-116.1610

Cited by 3 publications

(2 citation statements)

References 1 publication

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“…Expanded graphite as a kind of remarkable and new carbon material has excellent corrosion resistance, high temperature resistance, high thermal conductivity, a light weight, good adsorption, and insulation resistance. Therefore, it has been widely used in the fields of hydrogen storage, fuel cells, sensors, catalysts, adsorbents, medicine, and refractories ( Yang et al, 2011 ; Li et al, 2013 ; Li et al, 2010 ; Qi et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Mechanism of carbon nanotube growth in expanded graphite via catalytic pyrolysis reaction using carbores P as a carbon source

Wang,

Zhang,

Chen

et al. 2023

Front. Chem.

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Carbon nanotubes (CNTs) had potential applications in energy conversion and storage devices, and it could be prepared by expanded graphite loaded with catalyst at high temperature, however, the mechanism of carbon nanotube growth in expanded graphite need further confirmation. In this work, carbon nanotubes’ in situ growth in expanded graphite (EG) were prepared via catalytic pyrolysis reaction using carbores P as a carbon source and Co(NO3)3•6H2O as a catalyst. The results of X-ray diffraction (XRD), scanning electron microscope (SEM) and energy dispersive X-ray spectroscope (EDS) indicated the carbon nanotubes could generate in, EG with the presence of carbores P as a carbon source and cobalt nitrate as a catalyst. More interestingly, the growth mechanism of carbon nanotubes could be concluded by the results of differential thermal analysis-thermogravimetry-mass spectrometry (DTA-TG-MS) and X-ray photoelectron spectroscopy (XPS) analysis. The pyrolysis products of carbores P were mainly hydrocarbon gas such as CH4 gas, which reacts with Co(NO3)3·6H2O catalyst to reduces CoOx to Co particles, then the carbon form pyrolysis was deposited the on the surface catalyst Co particles and, after continuous solid dissolution and precipitation, carbon nanotubes were at last generated in EG at last.

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Section: Introductionmentioning

confidence: 99%

Mechanism of carbon nanotube growth in expanded graphite via catalytic pyrolysis reaction using carbores P as a carbon source

Wang,

Zhang,

Chen

et al. 2023

Front. Chem.

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show abstract

“…Graphite is a kind of crystal compound with layer structure, and its intercalating compound named expandable graphite can be prepared when noncarbonaceous reactants are inserted into graphite layers through chemical or electrochemical reaction [1,2]. Expandable graphite has many good properties: it can be used as catalyst in the synthesis of organic ester [3], and when it expands at high temperature, a poriferous material called expanded graphite is prepared.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Antiflame Performance of Expandable Graphite Modified with Sodium Hexametaphosphate

Zhao

Pang

Zhai

2015

Journal of Polymers

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A kind of polyphosphate modified expandable graphite (EG p ) was prepared in graphite oxidation and intercalation reaction with KMnO 4 as oxidant, H 2 SO 4 as intercalator, and sodium hexametaphosphate (SHMP) as assistant intercalator. The feasible mass ratio of C : KMnO 4 : H 2 SO 4 (98%) : SHMP was determined as 1.0 : 0.3 : 4.5 : 0.6, H 2 SO 4 was diluted to 77 wt% before intercalation reaction, and the reaction lasted for 40 min at 40 ∘ C. Expanded volume and initial expansion temperature of the prepared EG p reached 600 mL/g (at 800 ∘ C) and 151 ∘ C, respectively. X-ray diffraction spectroscopy testified the intercalation and layer structure of EG p , and Fourier transform infrared spectroscopy illuminated the intercalated functional groups. Flame retardance of the prepared EG p and the referenced EG (with only H 2 SO 4 as intercalator) for linear low density polyethylene (LLDPE) was also investigated. Addition of 30 wt% EG p to the polymer improved the limiting oxygen index (LOI) from 17.5 to 27.3%. On the other hand, the LOI of the same amount of the referenced EG was only 24.6%. Assistant intercalation of SHMP improved the dilatability and flame retardancy.

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Thermal and electrical properties of palmitic acid/expanded graphite composite phase change materials for thermal energy storage

Chen,

Wen,

Yuan

et al. 2024

Fullerenes, Nanotubes and Carbon Nanostructures

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The Study on the Preparation of Expanded Graphite by Fine Squama Graphite

Cited by 3 publications

References 1 publication

Mechanism of carbon nanotube growth in expanded graphite via catalytic pyrolysis reaction using carbores P as a carbon source

Mechanism of carbon nanotube growth in expanded graphite via catalytic pyrolysis reaction using carbores P as a carbon source

Preparation and Antiflame Performance of Expandable Graphite Modified with Sodium Hexametaphosphate

Thermal and electrical properties of palmitic acid/expanded graphite composite phase change materials for thermal energy storage

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