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Scientists Create Artificial Mother Of Pearl

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Research paves way for tough coatings fabricated from cheap, abundant materials

Mimicking the way mother of pearl is created in nature, scientists have for the first time synthesised the strong, iridescent coating found on the inside of some molluscs. The research was published today in the journal Nature Communications.

Decorative design using natural mother of pearl 
Credit: Wikipedia

Nacre, also called mother of pearl, is the iridescent coating that is found on the inside of some molluscs and on the outer coating of pearls. By recreating the biological steps that form nacre in molluscs, the scientists were able to manufacture a material which has a similar structure, mechanical behaviour, and optical appearance of that found in nature.

In order to create the artificial nacre, the scientists followed three steps. First, they had to take preventative measure to ensure the calcium carbonate, which is the primary component of nacre, does not crystallise when precipitating from the solution. This is done by using a mixture of ions and organic components in the solution that mimics how molluscs control this. The precipitate can then be adsorbed to surfaces, forming layers of well-defined thickness.

Next, the precipitate layer is covered by an organic layer that has 10-nm wide pores, which is done in a synthetic procedure invented by co-author Alex Finnemore. Finally, crystallisation is induced, and all steps are repeated to create a stack of alternating crystalline and organic layers.

Nacre decorative ball
Credit: Wikipedia

Professor Ulli Steiner, of the Department of Physics’ Cavendish Laboratory at the University of Cambridge, said: “Crystals have a characteristic shape that reflects their atomic structure, and it is very difficult to modify this shape. Nature is, however, able to do this, and through our research we were able to gain insight into how it grows these materials. Essentially, we have created a new recipe for mother of pearl using nature’s cookbook.”

Alex Finnemore, also of the Department of Physics’ Cavendish Laboratory, said: “While many composite engineering materials outperform nacre, its synthesis entirely at ambient temperatures in an aqueous environment, as well as its cheap ingredients, may make it interesting for coating applications. Once optimised, the process is simple and can easily be automated.”
Contacts and sources:
Genevieve Maul
University of Cambridge


Read more at Nano Patents and Innovations


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