808121
Expandable Graphite
flakes
Sinônimo(s):
Graphite intercalation compound, Intumescent flake graphite
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About This Item
Fórmula linear:
C24(HSO4)(H2SO4)2
Código UNSPSC:
12352200
NACRES:
NA.23
Produtos recomendados
descrição
Expansion Ratio (X:1): 270 to 325
Nível de qualidade
Formulário
flakes
tamanho de partícula
+50 mesh (>300μ, ≥75% minimum)
pH
5-10
solubilidade
water: insoluble
Categorias relacionadas
Descrição geral
Expandable graphite is a synthesized intercalation compound of graphite that expands or exfoliates when heated. This material is manufactured by treating flake graphite with various intercalation reagents that migrate between the graphene layers in a graphite crystal and remain as stable species.
If exposed to a rapid increase in temperature, these intercalation compounds decompose into gaseous products, which results in high inter-graphene layer pressure. This pressure develops enough force to push apart graphite basal planes in the “c” axis direction. The result is an increase in the volume of the graphite of up to 300 times, a lowering of bulk density, and approximately a 10-fold increase in surface area.
If exposed to a rapid increase in temperature, these intercalation compounds decompose into gaseous products, which results in high inter-graphene layer pressure. This pressure develops enough force to push apart graphite basal planes in the “c” axis direction. The result is an increase in the volume of the graphite of up to 300 times, a lowering of bulk density, and approximately a 10-fold increase in surface area.
Aplicação
- Graphene precursor.
- Inorganic source of carbon.
- Filler.
- Thermal additive.
- Fire retardant additive.
- Casting powders.
- Plastic additive.
- Rubber additive.
- EMF absorber.
- Milling and sieving.
- Bulk loading, unloading.
- Base material for gaskets and seals.
- Coatings.
Palavra indicadora
Warning
Frases de perigo
Declarações de precaução
Classificações de perigo
STOT RE 2 Inhalation
Órgãos-alvo
Lungs
Código de classe de armazenamento
13 - Non Combustible Solids
Classe de risco de água (WGK)
WGK 1
Ponto de fulgor (°F)
Not applicable
Ponto de fulgor (°C)
Not applicable
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Krawczyk P, and Skowronski, JM.
Electrochimica Acta, 79, 202-209 (2012)
Siegfried Eigler
Chemical communications (Cambridge, England), 51(15), 3162-3165 (2015-01-22)
Graphite sulphate is used as a precursor to graphene for the first time. The positively charged graphene layers react with water to yield a processable graphene derivative. The unprecedented low density of defects is determined to be 0.06% on average
Ayrat M Dimiev et al.
ACS nano, 6(9), 7842-7849 (2012-08-14)
Graphite intercalation compounds (GICs) can be considered stacks of individual doped graphene layers. Here we demonstrate a reversible formation of sulfuric acid-based GICs using ammonium persulfate as the chemical oxidizing agent. No covalent chemical oxidation leading to the formation of
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