louboutins pas cher base In a typical 0.3millimetre layer

Busting paint soaks up noxious gases chaussure louboutin pas cher A paint that soaks up some of the most noxious gases from vehicle exhausts will goes on sale in europe in march.Its makers hope it will give architects and town planners a new weapon in the fight against pollution. Called ecopaint, the christian louboutin pas cher france substance is designed to reduce levels of the nitrogen oxides, collectively known as the nox gases, which cause respiratory problems and trigger smog production. Patents filed last week show how the novel coating works.The paint's base is polysiloxane, a siliconbased polymer.Embedded in it are spherical nanoparticles of titanium dioxide and calcium carbonate 30 nanometres wide.Because the particles are so small, the paint is clear, but pigment can be added.The first paint to go on sale will be white. The polysiloxane base is porous enough to allow nox to diffuse though it and adhere to the titanium dioxide particles.The particles absorb ultraviolet radiation in sunlight and use this energy to convert nox to nitric acid. The acid is then either washed away in rain, or neutralised by the alkaline calcium carbonate particles, producing harmless quantities of carbon dioxide, water and calcium nitrate, which will also wash away. Robust louboutins pas cher base In a typical 0.3millimetre layer, there will be enough calcium carbonate to last five years in a heavily polluted city, says Robert McIntyre of the British company Millennium Chemicals, based in Grimsby, Lincolnshire, which developed the paint.When the carbonate has been exhausted, the titanium dioxide will continue to break down nox, but the acid this produces will discolour the paint. The breakthrough, says mcintyre, was finding a robust base material.Previous attempts to use titanium dioxide in paints to break down nox faltered because it attacked the base material as aggressively as it did the pollutants.Polysiloxane is resistant to attack by titanium dioxide, though the developers are not yet sure why. Ecopaint is being lab tested as part of the europefunded photocatalytic innovative coverings applications for depollution assessment programme(Picada).It has louboutins yet to be put the test in the field, but the companies say their experience with another catalytic coating shows how air quality can be improved. The paint could cover a much greater surface area than cement, since every building and piece of street furniture could be painted with it. Photocatalytic cements and paving slabs are already used in japan, where the market for such building materials is growing.And eu member states are required to monitor nox levels and ensure that by 2010 they have fallen below an annual average of 21 parts per billion.But current levels in cities are often tens of times that.