Clothesline Mike Lacon via Flickr

Future shirts and socks could clean themselves using just sunlight, chemists report — all you’ll have to do is drape them over the balcony and voila, clean laundry. A coating of titanium dioxide makes this possible.

Titanium dioxide is found in products like solar panels and sunscreen — it absorbs ultraviolet light — and in several cleaning products, because it can be used to oxidize organic material. Cement, paint, windows and even odor-free socks contain TiO2, which is prized for its ability to kill microbes and break down dirt.

Other researchers have incorporated titanium dioxide into clothes before, but they don’t get clean unless exposed to ultraviolet light, which isn’t exactly practical. Mingce Long of Shanghai Jiao Tong University and Deyong Wu of the Hubei University for Nationalities in Hubei, China, set out to create clothing with titanium dioxide coating that can self-clean using only sunlight.

To do this, they doped some TiO2 with nitrogen, which had been previously shown to work as a light-activated catalyst in visible light. They developed a new method to put this nanoparticle solution in liquid form, dunked cotton in it for one minute, then pressed the cotton, dried it and re-rinsed it. Then they added some silver iodide nanoparticles, which were intended to improve the fabric’s overall light sensitivity. The researchers stained the fabric with orange dye, and then exposed it to sunlight. The cotton broke down the orange, and also sterilized bacteria.

The best part: The coating remains intact after washing and drying. So even if you decide to break down and do actual laundry — or if someone does it for you — you can still revert back to the self-cleaning sunlight method later.

The paper is published in the American Chemical Society journal Applied Materials & Interfaces.

18 Comments

Nice!

I wonder what happens if I get caught in the rain and then later I go walking in the sun, drying my clothes as I wear them? How does titanium dioxide effect my skin?

For the long term, can I breath this
titanium dioxide from my clothes?

FYI:
http://www.ccohs.ca/oshanswers/chemicals/chem_profiles/titanium_dioxide/health_td.html

http://www.livestrong.com/article/277187-health-effects-of-using-titanium-oxide-in-skin-cream/
.............................
Science sees no further than what it can sense.
Religion sees beyond the senses.

Cool. I wonder how much more these shirts will cost.

Well I doubt titanium is toxic to the human body, because it's used in surgeries all the time. That said, this shirt sounds a fire hazard.

Add laundry to the list of "Things you will not be doing in 40 years".

Titanium Dioxide: Used in smog-killing sprays, self-cleaning shirts, and McDonald's salads!

I wonder if it works on woollen and synthetic products (see another article from today regarding bee-silk). Imagine how much energy/water could be saved if the majority of our clothes were coated with this stuff! Just to make it better, we could run string through this process to give the entire garment this protection from the "ground up" so to speak. Another question is if there is any remnant of the stain, and how long it took to erase it.

@NoOneYouKnow: well, just because titanium itself isn't harmful, doesn't mean titanium dioxide isn't.

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why learn from your own mistakes, when you could learn from the mistakes of others?
“The most incomprehensible thing about the universe is that it is comprehensible” -Albert Ein

I remember seeing some hokey tv show a LONG time back, mid-late 80's or so where they said they had a guy that claimed to be from the future, he had a few quarters with the dates on them and he claimed he had self cleaning underwear, they had him locked in a straight jacket, laughing at his "self cleaning" underwear... so when I saw this I was instantly reminded of that airing... wish I could remember the program, it was one of those "fake portrayed as real, real but looked fake" sort of tv shows that were just coming around... it would be crazy as hell if it were true.

Playing Devil's Advocate since 1978

"The only constant in the universe is change"
-Heraclitus of Ephesus 535 BC - 475 BC

I think the simple fact that Titanium Dioxide is used in toothpaste, skim milk, various foods, medicines and sunscreen should prove enough that it's "safe for human contact"

Playing Devil's Advocate since 1978

"The only constant in the universe is change"
-Heraclitus of Ephesus 535 BC - 475 BC

CodeZero,
My grandfather worked years with asbestos. He said back then everyone said it was safe, no worries.

My father worked for company years ago, making transformers for the electric company. They filled them with dioxin oil for cooling the transformers. That was considering safe back then too. Later the company went out of business.

My grandfather at the end suffocated to the end to his death.

What's the deal with all the Titanium Dioxide articles?

@rettaH i noticed that too, has popsci been sitting on these articles or are they actually finding out that titanium dioxide is a pretty nifty thing?

to mars or bust!

I'm pretty sure the "m" on each M&M is TiO2 as well. Those aren't too terribly toxic I hear....

FYI, this really could be a great product!!!
I just want people to be safe too.

*Looks out window* But it's cloudy and rainy for 8 months of the year here!

I recall a few years ago concern from the FDA I believe that regarding the over-use of nano particles in everyday objects from lipstick to lotions to paints. No one was sure of the long term effects of nano particles. The concern was that nano particles are so small they can work much deeper into tissues and cells than normal "particles." While titanium and titanium oxide is used extensively (in many products and heavily in foods) those are "normal" sized particles. Just because something is safe one way, doesn't mean its safe other ways. Salt (NaCl) is necessary for life, but sodium or chlorine in their own form will kill you. But even if this really works and dirt gets neutralized, the residue doesn't vanish. I'm sure it still needs to be washed regularly due to that.

THIS WOULD BE GREAT FOR USE WHEN YOU ARE IN THE FIELD FOR WEEKS AT A TIME.



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