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Wednesday, 18 September 2019
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Raw materials & technologies, Raw materials

Licensing agreement reached on brilliant blue pigment discovered by happy accident

Friday, 29 May 2015

A brilliant new blue pigment – discovered serendipitously by Oregon State University (OSU) chemists in 2009 – is now reaching the marketplace, where it will be used in a wide range of coatings and plastics.

The vibrant blue is so durable, and its compounds are so stable – even in oil and water – that the colour does not fade. Source: OSU

The vibrant blue is so durable, and its compounds are so stable – even in oil and water – that the colour does not fade. Source: OSU

The commercial development has solved a quest that began thousands of years ago, and captured the imagination of ancient Egyptians, the Han dynasty in China, Mayan cultures and others – to develop a near-perfect blue pigment.

It happened accidently

OSU chemist Mas Subramanian and his team were experimenting with new materials that could be used in electronics applications and they mixed manganese oxide – which is black in colour – with other chemicals and heated them in a furnace to nearly 2,000 degrees Fahrenheit. One of their samples turned out to be a vivid blue. Oregon State graduate student Andrew Smith initially made these samples to study their electrical properties. "It was serendipity, actually; a happy, accidental discovery,” Subramanian said.

Colour does not fade

The new pigment is formed by a crystal structure that allows the manganese ions to absorb red and green wavelengths of light, while only reflecting blue. The vibrant blue is so durable, and its compounds are so stable – even in oil and water – that the colour does not fade.These characteristics make the pigment versatile for a variety of commercial products. Used in paints, for example, they can help keep buildings cool by reflecting infrared light. Better yet, Subramanian said, none of the pigment’s ingredients are toxic. OSU has reached an exclusive licensing agreement for the pigment, which is known as "YInMn” blue, with The Shepherd Color Company. It will be used in a wide range of coatings and plastics. "This new blue pigment is a sign that there are new pigments to be discovered in the inorganic pigments family,” said Geoffrey T. Peake, research and development manager for The Shepherd Color Company. Commercial quantities of the pigment will be available later this year, he added.

Infrared reflectivity of 40 percent

The lack of toxic materials is critical, Subramanian pointed out. Other attempts at creating new pigments were not so fortunate. Cobalt blue, developed in France in the early 1800s, can be carcinogenic. Prussian blue can release cyanide. Other blue pigments are not stable when exposed to heat or acidic conditions. "The basic crystal structure we’re using for these pigments was known before, but no one had ever considered using it for any commercial purpose, including pigments,” Subramanian said.  "Ever since the early Egyptians developed some of the first blue pigments, the pigment industry has been struggling to address problems with safety, toxicity and durability.” Another commercial use of the product – in addition to coatings and plastics, may be in roofing materials. The new pigment is a "cool blue” compound that has infrared reflectivity of about 40 percent – much high than other blue pigments – and could be used in the blue roofing movement.

Who knows what we may find?

"The more we discover about the pigment, the more interesting it gets,” said, Subramanian, who is the Milton Harris Professor of Materials Science in the OSU College of Science.  "We already knew it had advantages of being more durable, safe and fairly easy to produce. Now it also appears to be a new candidate for energy efficiency.” In addition to testing the blue pigment for other applications, Subramanian is attempting to discover new pigments by creating intentional laboratory "accidents.” His original work was funded by the National Science Foundation. "Who knows what we may find?,” he said.

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