Some scientists claim to be able to make room temperature ice (yes, I presume at 1 atm pressure). Not sure what to make of it:
Earth's climate is strongly influenced by the presence of particles of different shapes and origins "” in the form of dust, ice and pollutants "” that find their way into the lowest portion of the atmosphere, the troposphere. There, water adsorbed on the surface of these particles can freeze at higher temperatures than pure water droplets, triggering rain and snow.Researchers at Spain's Centre d'InvestigaciÃ³ en NanociÃ¨ncia i Nanotecnologia (CIN2) have studied the underlying mechanisms of water condensation in the troposphere and found a way to make artificial materials to control water condensation and trigger ice formation at room temperature. Described in the Journal of Chemical Physics, which is published by the American Institute of Physics, their work may lead to new additives for snowmaking, improved freezer systems, or new coatings that help grow ice for skating rinks.
The next step? The researchers' goal now is to produce environmentally-friendly synthetic materials for efficiently inducing snow. "If water condenses in an ordered way, such as a hexagonal structure, on such surfaces at ambient conditions, the term "˜room temperature ice' would be fully justified," adds Verdaguer. "The solid phase, ice, would be produced by a surface effect rather than as a consequence of temperature. In the long term, we intend to prepare smart materials, "˜intelligent surfaces,' that will react to water in a predefined way."
I remember some work on how water boiling could be suppressed by polishing surfaces where bubbles form (watch a pot of water boiling, the bubbles appear on the pan surfaces). I presume this may be a related effect.