Difference between revisions of "Caesium hydroxide"
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| − | '''Caesium hydroxide''' (CsOH) is | + | '''Caesium hydroxide''' (CsOH) is the product of the violent reaction between [[caesium]] and [[water]]: |
| − | + | :2Cs + 2H<sub>2</sub>O → 2CsOH + H<sub>2</sub> | |
| − | + | It is a powerful [[base (chemistry)|base]], much like other alkali metal hydroxides such as [[sodium hydroxide]] and [[potassium hydroxide]], and will quickly corrode through glass. It is also extremely [[hygroscopic]], and laboratory caesium hydroxide is typically a [[Hydrate|monohydrate]]. | |
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| − | Caesium hydroxide can | + | Caesium hydroxide is an anisotropic etchant of [[silicon]], exposing [[octahedron|octahedral]] planes. This technique can create pyramids and regularly-shaped etch pits for uses such as [[MEMS]]. It has a higher selectivity to etch highly p-doped silicon than the more commonly used [[potassium hydroxide]].{{fact}} |
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==References== | ==References== | ||
Latest revision as of 21:20, 25 August 2009
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Caesium hydroxide (CsOH) is the product of the violent reaction between caesium and water:
- 2Cs + 2H2O → 2CsOH + H2
It is a powerful base, much like other alkali metal hydroxides such as sodium hydroxide and potassium hydroxide, and will quickly corrode through glass. It is also extremely hygroscopic, and laboratory caesium hydroxide is typically a monohydrate.
Caesium hydroxide is an anisotropic etchant of silicon, exposing octahedral planes. This technique can create pyramids and regularly-shaped etch pits for uses such as MEMS. It has a higher selectivity to etch highly p-doped silicon than the more commonly used potassium hydroxide.[ref. needed]
References
- ↑ CRC Handbook of Chemistry and Physics, 62nd ed.; Weast, Robert C., Ed.; CRC Press: Boca Raton, FL, 1981; p B-92. ISBN 0-8493-0462-8.
- ↑ CRC Handbook of Chemistry and Physics, 87th ed.; Lide, David R., Ed.; CRC Press: Boca Raton, FL, 2006; p 5-14. ISBN 0-8493-0487-3.
- ↑ GHS classification – ID 812, <http://www.safe.nite.go.jp/english/ghs_index.html#results> (accessed 26 August 2009), Japanese GHS Inter-ministerial Committee, 2006.
Further reading
- Corey, E. J.; Noe, Mark C. Preparation of O-Allyl-N-(9-anthracenylmethyl)cinchonidinium Bromide as a Phase Transfer Catalyst for the Enantioselective Alkylation of Glycine Benzophenone Imine tert-Butyl Ester: (4S)-2-(Benzhydrylidenamino)pentanedioic Acid, 1-tert-Butyl Ester-5-Methyl Ester. Org. Synth. 2003, 80, 38, <http://www.orgsyn.org/orgsyn/orgsyn/prepContent.asp?prep=v80p0038>.
External links
| Error creating thumbnail: Unable to save thumbnail to destination |  |
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