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New use of graphene: non-toxic hair dye
Graphene, often referred to as a "magic material," is a single layer of carbon atoms that has captured the attention of scientists worldwide. Recently, researchers at Northwestern University have discovered a new and innovative use for this remarkable material: creating a safer alternative to traditional hair dyes. Led by Professor Huang Jiaxing, the team developed a hair coloring solution that is significantly less harmful than conventional products.
Traditional hair dyes typically contain chemicals like ammonia, which are used to lift the cuticle scales on each strand of hair, allowing color molecules to penetrate and alter the hair's appearance. While effective, this process can weaken the hair structure over time and may cause irritation or allergic reactions due to the small size of the dye molecules, which can be absorbed through the skin.
In contrast, the graphene-based hair dye developed by the research team is non-toxic and chemically inert. The formula includes tiny graphene fragments that wrap around each hair strand, forming a smooth, even coating that imparts a natural sheen. A non-toxic polymer binder ensures the graphene adheres well to the hair and remains intact through multiple washes—up to 30 cycles, according to the study.
Another key advantage of graphene is its larger molecular size compared to traditional dye molecules, making it far less likely to penetrate the skin and cause harm. Additionally, graphene’s antistatic properties help reduce frizz and static, leading to smoother, more manageable hair. The application process is quick, taking less than 10 minutes from start to finish.
The researchers used a relatively affordable form of graphene called graphene oxide, which makes the product cost-effective. “This hair dye can make the hair surface conductive,†said Professor Huang Jiaxing. “It could be used in wearable electronics or as a conductive probe. The possibilities are endless—limited only by our creativity.†This breakthrough not only offers a safer option for hair coloring but also opens up exciting new avenues for integrating technology with everyday beauty products.