Graphite <\/a>dark gray with metallic luster, flaky, smooth touch. Fullerenes are black or brown powder, carbon nanotubes are extremely thin black tubes. And graphene is a nearly transparent, two-dimensional sheet with a distinctive wrinkled texture.<\/p>\nDensity<\/strong><\/p>\nDiamond about 3.5-3.53g\/cm3, atoms tightly packed; Graphite about 2.09-2.23g\/cm3, there is a gap between the layers. Fullerenes are about 1.65g\/cm3, carbon nanotubes are 1.3-1.4g\/cm3, and graphene is about 2.267g\/cm3, with densities varying depending on atomic arrangement and structure.<\/p>\n
Melting point<\/strong><\/p>\nThe melting point of diamond exceeds 3500\u00b0C, and the atoms form regular tetrahedrons with covalent bonds, and the structure is solid. The melting point of graphite is about 3652-3697\u00b0C, and the covalent bond in the layer is stable. The high melting point makes the carbon stable in high temperature environment and is used in high temperature industrial fields.<\/p>\n
Boiling point<\/strong><\/p>\nDiamond and graphite boiling point are about 4827\u00b0C, under normal conditions. Carbon is difficult to change from solid to gas, extremely high temperature to change the state. In the industrial and living environment, carbon physical and chemical properties are stable, not easy to volatilize decomposition.<\/p>\n
Solubility<\/strong><\/p>\nCarbon is insoluble in water, common organic solvents and acid and alkali solutions. Because of its stable atomic structure and strong interatomic force, the solvent molecule is difficult to break the carbon elemental structure and its action. And the solubility is extremely low in most solvents.<\/p>\n