Ice-nine

Ice-nine is a fictional material conceived by writer Kurt Vonnegut in his novel "Cat's Cradle". It is supposed to be a more stable polymorph of water than common ice (Ice I_h) which instead of melting at 0° Celsius (32° Fahrenheit), melts at 45.8°C (114.4°F). When ice-nine comes into contact with liquid water below 45.8°C (which is thus effectively supercooled), it acts as a seed crystal, and causes the solidification (freezing) of the entire body of water which quickly crystallizes as ice-nine. This occurs at the end of the novel, when all the oceans are frozen to ice-nine.

Vonnegut came across the idea while working at General Electric::The author Vonnegut credits the invention of ice-nine to Irving Langmuir, who pioneered the study of thin films and interfaces. While working in the public relations office at General Electric, Vonnegut came across a story of how Langmuir, who won the 1932 Nobel Prize for his work at General Electric, was charged with the responsibility of entertaining the author H.G. Wells, who was visiting the company in the early 1930s. Langmuir is said to have come up with an idea about a form of solid water that was stable at room temperature in the hopes that Wells might be inspired to write a story about it. Apparently, Wells was not inspired and neither he nor Langmuir ever published anything about it. After Langmuir and Wells had died, Vonnegut decided to use the idea in his book "Cat's Cradle". [cite journal| title=Using Science Fiction To Teach Thermodynamics: Vonnegut, Ice-nine, and Global Warming| journal=Journal of Chemical Education| volume=81| year=2004| pages=509]

Nonfiction

While multiple polymorphs of ice do exist (they can be created under pressure), none has the properties described in this book, and none are stable at standard temperature and pressure above the ordinary melting point of ice. The real Ice IX has none of the properties of Vonnegut's creation, and can exist only at extremely low temperatures and high pressures.

The ice-nine phenomenon has, in fact, occurred with a few other kinds of crystals, called "disappearing polymorphs". In these cases, a new variant of a crystal has been introduced into an environment, replacing many of the older form crystals with its own form. One example is the anti-AIDS medicine ritonavir, where the newer version destroyed the effectiveness of the drug. [Morissette, Soukasene, Levinson, Cima, and Almarsson: " [http://www.pubmedcentral.gov/articlerender.fcgi?tool=pubmed&pubmedid=12604798 Elucidation of crystal form diversity of the HIV protease inhibitor ritonavir by high-throughput crystallization] ", pgs. 2180–2184. "Proceedings of the National Academy of Sciences of the United States of America", March 2003.]

In popular culture

*"Ice-nine" has been used as a metaphor for highly infectious agents, or for anything that converts other things to more of itself. Such metaphors have included grey goo (hypothetical self-replicating nanotechnology), prions (the self-replicating protein structures responsible for mad cow disease), a runaway fusion reaction of negatively-charged strange matter [Wilczek, Frank. Letter, "Scientific American", July 1999.] , and a comparison to sodium acetate. [Gray, Theodore, [http://theodoregray.com/PeriodicTable/PopularScience/2007/10/1/Scan.small.jpgGray Matters, Icy Hot, The mysterious material inside hand warmers "freezes" almost instantly] , "Popular Science", October 2007.]

*"Ice 9" is the title of a song by Joe Satriani from his album Surfing with the Alien.

ee also

*Polywater
*Tiberium, another fictional material with a similar effect

References

Further reading

* [http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=9383397&dopt=Abstract "The chemistry of scrapie infection: implications of the 'ice 9' metaphor" from Chem Biol. 1995 Jan]