CHEN 1000 Nanotech lecture 3 Notes

CHEN 1000 Nanotech lecture 3 Notes - Self-Cleaning Surface...

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1 What’s the Big Deal about Nano? What’s the Big Deal about Nano? Self-Cleaning Surface Coatings A: tiles painted with nano-TiO 2 paint B: tiles painted with conventional paint Titanium dioxide nanoparticles convert water and oxygen into highly reactive radicals in the presence of sunlight. The radicals degrade oils, organic chemicals, molds, bacteria, etc. Nanoparticles can be mixed into conventional materials to create nanocomposite materials with unique properties. nanoparticle: a particle 2-100 nm in diameter conventional particles/powders: 100s of nm or larger Nanoparticles When particles are made very small, substances can have entirely different properties: •chemical •electrical •optical Surface Area For some applications, it is necessary for molecules to contact the particle surface. All the work is done by atoms at the surface. Examples: sorption: molecules stick to the surface (scavenging toxic molecules and metals) catalysis / reactivity: causing reactions to occur (including degradation of toxic and hazardous chemicals) Clicker Question Two identical gold bricks are ground into small particles. •Brick 1 is divided into particles that are about 10 µ m in diameter. •Brick 2 is divided into particles that are about 1 µ m in diameter. Which of the two gold powders has more TOTAL surface area? A: the one with 10 µ m particles B: the one with 1 µ m particles Do the Math Consider a model cubic particle, 2 µ m on an edge. What is the total surface area?
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CHEN 1000 Nanotech lecture 3 Notes - Self-Cleaning Surface...

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