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Rapid Production of Micro- and Nano-particles Using Supercritical Water pp 57–62Cite as

Nano-Structured Coatings

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Abstract

Carbide ceramics were coated with a nano-structured carbon film (10 nm∼1 μm) that could reduce the friction coefficient by SCW treatment. SCW is very corrosive to a stainless steel made reactor particularly when acids and oxygen are added or formed. At such conditions, the reactor was corroded to form water soluble metal cations that were further hydrolyzed and subsequently dehydrated to fine metal oxide particles. In order to avoid corrosion, the reactor could be pretreated in SCW by adding metal salts [e.g., Ce(NO3)2] to form a metal oxide (e.g., CeO2) nano-structured layer on the wall surface. We can also protect the reactor by adding ionic light metal salts (e.g., NaCl, Na2CO3) in water that will precipitate to fine particles to form a layer on the wall at supercritical conditions. The fine salt particles can be obtained by removing them from supercritical solution after they are precipitated in SCW.

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Authors and Affiliations

  1. Chinese Academy of Science, Xishuangbanna Tropical, Botanical Garden, Biomass Group, Xuefulu 88, 650223, Kunming, China, People’s Republic

    Zhen Fang

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  1. Zhen Fang
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Correspondence to Zhen Fang .

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Fang, Z. (2010). Nano-Structured Coatings. In: Rapid Production of Micro- and Nano-particles Using Supercritical Water. Engineering Materials. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-12987-2_4

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