Nanotechnology and smelly socks
Why do feet smell? How do chemists help to
In this activity you will find out how chemists are helping to solve an unpleasant
Your clothes are next to your skin. Your skin
1.What are the conditions that allow the bacteria to thrive on your skin and clothes?
My answers is (Moist,warmth,Full Nutritent contents of slough and chronic wound with infection ) Whats yours?
In low numbers these bacteria are not a
Look at the picture below of T-shirt fibres.
Now look more closely:
If you look at the middle of the photograph above, you can see that there seems to be some damage to the fibre. This is not visible to the naked eye.
Look at the fibre in close-up:
It is still hard to tell what the damage is caused by. The next photograph should help:
A colony of bacteria is living on the t-shirt fibre. The bacteria glue themselves to it and form a ‘biofilm.’ This biofilm is very difficult to remove and can remain even after washing.
Scientists at Arch Chemicals have been working on a solution to this
Cotton fibres are made of cellulose, which is a polymer of glucose and is similar to starch. When the fibres are
Part of the cotton fibre is an acid. The fibre can lose an H+ ion leaving a negative charge on the remaining fibre:
For the Purista® treatment to stick to the cotton fibres it is important that there are several negative charges on each fibre.
The substance used to treat the cotton is also a polymer. Its chemical name is PHMB, which stands for poly(hexamethylene biguanide hydrochloride).
Each molecule of PHMB contains about 16 of the repeating units shown in the diagram.
The PHMB winds along the cotton like a snake and bonds at several places along its length like velcro®. This helps the PHMB to lie flat on the surface of the cotton. The coating on the surface is no more than a few nanometers thick, which makes this an example of nanotechnology. The bonds are strong enough to hold the PHMB on the cloth even during washing.
Thanks for great information of RSC advancing the chemical sciences:Nanotechnology and smelly Socks