The radii of the suspended particles are measured in millionths of a metre, so if they can be controlled, fine structures can be built up.

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Improved atmospheric modeling under Titan will help researchers better understand future air quality as well as the effect of particles suspended in the air.

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Colloidal silver is a solution of submicroscopic particles of pure silver suspended in water by an electric charge on each particle.

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Those particles are small enough to stay suspended in the air for hours, and can enter into the airways of a person's lungs, Dr McNerney said.

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Investors putting in buy and sell calls should then act a bit like particles in a glass of milk, which remain suspended because they are constantly bustling into one another in a process known as Brownian motion.

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