The ice crystals start to join up in plates when the overall thickness is about 4 nm thick.
The image above is showing ice sheets forming. Studies of ice forming at nanoscale are adding to our knowledge of water, one of the most important substances on Earth. The sheets are about 50,000 times thinner than a human hair. This is the first time scientists have obtained pictures of ice only a few nanometers thick in the act of forming bulk ice (at the coldest of temperatures).
PlanetBye is a blog run by Bente Lilja Bye aka Stellare. PlanetBye covers mainly scientific topics but also completely random topics like art, social media, personal ramblings etc. The posts on this blog are generally short with links to further reading and sources of information. Clicking on images is encouraged.