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Scientists develop holographic characterization to improve quality and consistency of cosmetics

By Andrew McDougall+

06-Feb-2015
Last updated on 06-Feb-2015 at 12:54 GMT2015-02-06T12:54:07Z

Holograms of individual spheres, such as the examples shown here, were used to improve the manufacturing process that created the silicone-rubber spheres shown in the grey-scale images. Image courtesy of David Grier.
Holograms of individual spheres, such as the examples shown here, were used to improve the manufacturing process that created the silicone-rubber spheres shown in the grey-scale images. Image courtesy of David Grier.

A team of physicists say they have created new opportunities to improve the quality and consistency of a wide range of industrial and consumer products, such as cosmetics, by developing a method to monitor the properties of microscopic particles as they grow within a chemical reaction vessel.

The team, from New York University, published their findings in the journal Soft Matter saying that perfumes and cosmetics were among the commodities that could benefit, along with food and pharmaceuticals.

The research is seen as a breakthrough as scientists could not previously look inside a growing microparticle and understand the nature of the material it was composed of.

"We can now look at each of the particles in a developing dispersion to see how the chemical reaction is progressing and whether the particles are turning out the way they should," explains NYU Physics Professor David Grier.

"In the past, there was no way to know these answers because we could not characterize particles' makeup," he explains. "Now we can."

Technique

The research relies on a technique, holographic video microscopy, which was developed in Grier's lab at NYU in 2007, which uses a laser beam to create holographic images of individual particles using conventional video cameras and digital video recorders to record the data.

The researchers’ novel analysis of these digitized holograms yields an unprecedented wealth of information about the positions and properties of the individual particles within the sample, which can reveal how well the reaction is progressing and what steps should be taken to optimize its products.

To demonstrate the capabilities of their technique, the researchers studied the synthesis of crosslinked polydimethysiloxane (PDMS) spheres, which are compounds that make up silicone.

However, Grier says, the procedure could be applied to particles that comprise many consumer products.

"If a cosmetics company wants to add a new fragrance to its products or a pharmaceutical company needs to change the active ingredients of a drug, they need to add new chemical compounds," he explains.

"But how will they interact? How will this change the consistency of the product? And, especially in the case of drug development, will they be effective? This procedure shows that we now have the potential to understand this process at the most fundamental level, which would enhance both product design and production."

Future plans

Holographic characterization provides insights into the properties of products that will enhance their safety, functionality, and consistency, and will reduce costs by improving process control and eliminating the need for trial-and-error testing, Grier says.

His group's proof-of-concept demonstration is being brought to the market by Spheryx, Inc., which has exclusively licensed NYU's technology for holographic characterization.

 

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Chen Wang, Hagay Shpaisman, Andrew D. Hollingsworth, David G. Grier.Celebrating Soft Matter’s 10th Anniversary: Monitoring colloidal growth with holographic microscopySoft Matter, 2015; 11 (6): 1062 DOI:10.1039/C4SM01979B

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