Difference between revisions of "Caesium hydroxide"
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'''Caesium hydroxide''' (CsOH) is a [[chemical compound]] consisting of an atom of [[caesium]] and a [[hydroxide]] group (also known as [[hydroxyl]]). It is a powerful [[base (chemistry)|base]], much like other [[alkali hydroxide|alkali metal hydroxides]] such as [[sodium hydroxide]] and [[potassium hydroxide]]. In fact, caesium hydroxide is powerful enough to quickly corrode through glass. | '''Caesium hydroxide''' (CsOH) is a [[chemical compound]] consisting of an atom of [[caesium]] and a [[hydroxide]] group (also known as [[hydroxyl]]). It is a powerful [[base (chemistry)|base]], much like other [[alkali hydroxide|alkali metal hydroxides]] such as [[sodium hydroxide]] and [[potassium hydroxide]]. In fact, caesium hydroxide is powerful enough to quickly corrode through glass. | ||
| − | + | Caesium hydroxide is extremely [[hygroscopic]], and laboratory caesium hydroxide is typically a [[Hydrate|monohydrate]]. | |
It 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 is known to have a higher selectivity to etch highly p-doped silicon than the more commonly used [[potassium hydroxide]].{{fact}} | It 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 is known to have a higher selectivity to etch highly p-doped silicon than the more commonly used [[potassium hydroxide]].{{fact}} | ||
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Caesium hydroxide can be obtained by the following chemical reaction: | Caesium hydroxide can be obtained by the following chemical reaction: | ||
Revision as of 20:17, 25 August 2009
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Caesium hydroxide (CsOH) is a chemical compound consisting of an atom of caesium and a hydroxide group (also known as hydroxyl). It is a powerful base, much like other alkali metal hydroxides such as sodium hydroxide and potassium hydroxide. In fact, caesium hydroxide is powerful enough to quickly corrode through glass.
Caesium hydroxide is extremely hygroscopic, and laboratory caesium hydroxide is typically a monohydrate.
It 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 is known to have a higher selectivity to etch highly p-doped silicon than the more commonly used potassium hydroxide.[ref. needed]
Caesium hydroxide can be obtained by the following chemical reaction:
- 2Cs + 2H2O → 2CsOH + H2
The above reaction occurs explosively with enough force to shatter a Pyrex beaker.
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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