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First synthesis of gold nanoparticles inside human hair for dyeing and much more

Date:
December 5, 2012
Source:
American Chemical Society
Summary:
In a discovery with applications ranging from hair dyeing to electronic sensors to development of materials with improved properties, scientists are reporting the first synthesis of gold nanoparticles inside human hairs.
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Gold nanoparticles darken hair after treatment for one day, center, and 16 days, right (untreated hairs, left).
Credit: American Chemical Society

In a discovery with applications ranging from hair dyeing to electronic sensors to development of materials with improved properties, scientists are reporting the first synthesis of gold nanoparticles inside human hairs.

Their study appears in ACS' journal Nano Letters.

Philippe Walter and colleagues explain that gold nanoparticles -- 40,000-60,000 of which could fit across the width of a human hair -- are a hot topic. Scientists are exploring uses, ranging from electronics and sensors to medical diagnostic tests and cancer treatments. Gold nanoparticles have been deposited on hair for use as electrodes, and gold nanoparticles had been used to dye wool. Walter's team looked at a new use -- dyeing hair, inspired by the ancient Greeks' and Romans' use of another metal, lead, to color their hair.

They describe the first synthesis of fluorescent gold nanoparticles inside human hair. It involved soaking white hairs in a solution of a gold compound. The hairs turned pale yellow and then darkened to a deep brown. Using an electron microscope, the scientists confirmed that the particles were forming inside the hairs' central core cortex. The color remained even after repeated washings.

The authors acknowledge funding from the Agence Nationale de la Recherche.


Story Source:

The above post is reprinted from materials provided by American Chemical Society. Note: Materials may be edited for content and length.


Journal Reference:

  1. Shrutisagar D. Haveli, Philippe Walter, Gilles Patriarche, Jeanne Ayache, Jacques Castaing, Elsa Van Elslande, Georges Tsoucaris, Ping-An Wang, Henri B. Kagan. Hair Fiber as a Nanoreactor in Controlled Synthesis of Fluorescent Gold Nanoparticles. Nano Letters, 2012; 121112101302003 DOI: 10.1021/nl303107w

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American Chemical Society. "First synthesis of gold nanoparticles inside human hair for dyeing and much more." ScienceDaily. ScienceDaily, 5 December 2012. <www.sciencedaily.com/releases/2012/12/121205121157.htm>.
American Chemical Society. (2012, December 5). First synthesis of gold nanoparticles inside human hair for dyeing and much more. ScienceDaily. Retrieved September 4, 2015 from www.sciencedaily.com/releases/2012/12/121205121157.htm
American Chemical Society. "First synthesis of gold nanoparticles inside human hair for dyeing and much more." ScienceDaily. www.sciencedaily.com/releases/2012/12/121205121157.htm (accessed September 4, 2015).

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