title: Nano-fibriform production of silica from natural chrysotile.
abstract: Nano-fibriform silica was extracted from chrysotile by the acid-leaching method. The acid-leached residue of chrysotile has been studied by TEM, XRD, FT-IR, and thermal analysis techniques, etc. When the magnesium leaching degree (MLD) is over 90%, the nano-fibriform silica consists of hydrous silicon dioxide (above 90%) with small amount of magnesium trapped inside the SiO network. The amount of hydroxyl on surface of nano-fibriform silica is 6 unit nm(-2). This value is between the values of fumed and precipitated silica. This study shows that nano-fibriform silica is a kind of amorphous matter with a high special surface area (368 m2/g), a high adsorption (330 cm3/g), and a larger pore volume (0.51 cm3/g). The diameter of a single silica fiber is 20-30 nm. The nitrogen adsorption isotherm is similar to Type IV curve. The nano-fibriform silica is one of mesopores materials.
authors.affiliation: School of Earth and Space Sciences, Peking University, Beijing 100871, China.
authors.forename: Lijuan
authors.initials: L
authors.lastname: Wang
authors.forename: Anhuai
authors.initials: A
authors.lastname: Lu
authors.forename: Changqiu
authors.initials: C
authors.lastname: Wang
authors.forename: Xishen
authors.initials: X
authors.lastname: Zheng
authors.forename: Dongjun
authors.initials: D
authors.lastname: Zhao
authors.forename: Rui
authors.initials: R
authors.lastname: Liu