3D printers on the march
Liquid metal enables new 3D printers to work up to 100 times faster than earlier models
Nanotexturing that prevents scale forming on the inside of pipes can reduce plant maintenance costs significantly
What does the pipework in a modern desalination plant and a 1 BC Roman cooking pot have in common? You would think nothing at first.
But archaeological digs uncovering the history of humanity throughout the centuries have shown us that ancient civilizations lived with a dilemma we are still trying to resolve: the accumulation of scale left by water on metal objects.
This same handicap, which has persisted since man’s first use of technology, will soon be a thing of the past, thanks to researchers from Massachusetts Institute of Technology (MIT). They have spent the past two years developing coatings for metal surfaces that will avoid accumulation of the deposits left by water.
When water cools, or evaporates, its capacity to dissolve is reduced and the mineral salts that have not dissolved in it tend to separate from the liquid and stick to walls and surfaces. These scales accumulate and with the passage of time cause inefficiency in pipes due to flow loss, changes in internal pressure and other negative factors.
The work of the MIT scientists is based on the development of nanoscale texturing for the inside of pipes, which is then coated with a lubricating liquid. The lubricant remains captive between the nanotextured layers and capillary action prevents it from escaping so that the minerals the water leaves in its wake slide away and fail to accumulate.
Thanks to this innovation, the accumulation of residue has been reduced up to tenfold, increasing efficiency in water treatment plants, for example. It has also been responsible for removing barriers to refrigeration and condensation in heat exchangers.
Meanwhile, as a result, maintenance is becoming cheaper at gas and oil facilities, through more homogeneous flows, and environmental impact minimized, since a small quantity of lubricant, according to MIT, guarantees the optimum operation of the pipelines during the useful life of materials.
The solution could mean an end to a problem that humans have lived with for hundreds of years.