Please explain this to me!
- Thread starter Gr8KarmaSF
- Start date
Really dense stuff...
Offshore deposits are a major source of sand throughout the Gulf Coast, New York, New ENgland....Some of the world's sand is crushed coral digested from fish....SOme form Volcanoes...This stuff from YouTube looks like lab stuff....Or could be some type of dense concrete mixture bred fine....
Offshore deposits are a major source of sand throughout the Gulf Coast, New York, New ENgland....Some of the world's sand is crushed coral digested from fish....SOme form Volcanoes...This stuff from YouTube looks like lab stuff....Or could be some type of dense concrete mixture bred fine....
Due to its water repellence, grains of the sand will adhere to each other in the presence of water. When sprinkling grains onto the surface of water, they will at first form a "sand raft", until the weight of the sand is large enough to break the surface tension. The mass will then sink to the bottom as a single object. When immersed, the sand forms columns in order to reduce the surface area in contact with water. As soon as the sand is taken out of water, it is completely dry and flows freely.
These properties are achieved by covering ordinary beach sand with tiny particles of pure silica and exposing them to vapors of trimethylsilanol (CH3)3SiOH, an organosilicon compound. Upon exposure, the trimethylsilane compound bonds to the silica particles while forming water. The exteriors of the sand grains are thus coated with hydrophobic groups.
These properties are achieved by covering ordinary beach sand with tiny particles of pure silica and exposing them to vapors of trimethylsilanol (CH3)3SiOH, an organosilicon compound. Upon exposure, the trimethylsilane compound bonds to the silica particles while forming water. The exteriors of the sand grains are thus coated with hydrophobic groups.
