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808121

Sigma-Aldrich

Expandable Graphite

flakes

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Synonym(s):
Graphite intercalation compound, Intumescent flake graphite
Linear Formula:
C24(HSO4)(H2SO4)2
NACRES:
NA.23

description

Expansion Ratio (X:1): 270 to 325

Quality Level

form

flakes

particle size

+50 mesh (>300μ, ≥75% minimum)

pH

5-10

solubility

water: insoluble

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This Item
808091900561796034
Sigma-Aldrich

808121

Expandable Graphite

Graphite flakes, 99% Carbon, −100 mesh (≥80%), natural

808091

Graphite

Graphene powder, electrical conductivity >103 S/m, avg. no. of layers, < 3

900561

Graphene

Graphene oxide powder, 15-20 sheets, 4-10% edge-oxidized, avg. no. of layers, 15 ‑ 20

796034

Graphene oxide

form

flakes

form

flakes

form

powder

form

powder

particle size

+50 mesh (>300μ, ≥75% minimum)

particle size

-

particle size

-

particle size

-

pH

5-10

pH

-

pH

-

pH

-

solubility

water: insoluble

solubility

-

solubility

-

solubility

water: dispersible (polar solvents)

Quality Level

100

Quality Level

100

Quality Level

100

Quality Level

100

General description

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.

Application

  • 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.

pictograms

Health hazard

signalword

Warning

hcodes

Hazard Classifications

STOT RE 2 Inhalation

target_organs

Lungs

Storage Class

13 - Non Combustible Solids

wgk_germany

WGK 1

flash_point_f

Not applicable

flash_point_c

Not applicable


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Electrochemical reactivation of expanded graphite electrodes covered by oligomeric products of phenol electrooxidation.
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
Nicolas R Tanguy et al.
ChemSusChem, 14(4), 1057-1067 (2020-11-28)
The increasing demand for wearable electronics has driven the development of supercapacitor electrode materials toward enhanced energy density, while being mechanically strong, flexible, as well as environmentally friendly and low-cost. Taking advantage of faradaic reaction of quinone groups in natural
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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