Test 3 - Biomimetics- 12 ?s Materials bulk vs. surface...

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Biomimetics- 12 ?s Materials – bulk vs. surface properties Plastic, metals, ceramics – know their properties know composites, laminates, protective coatings and examples Know importance of palm beetles, geckos, lotus leaves Know adhesion and how it works What makes up nacre? Contact angle, hydrophilic, hydrophobic, superhydrophobic Surface area Material Is… Is not… Plastic Light, flexible, slippery Strong, hard, or tough Metal Strong, tough, conductive Light, hard or rigid Ceramic Hard and rigid Tough ( brittle in fact) Properties of materials o Bulk properties Strong Tough Rigid vs flexible Soft Light Dense vs porous Degradable Transparent Conductive vs insulating o Surface properties Hard Slippery Sticky/adhesive Biocompatible Wetting vs non-wetting Chemically reactive Inert o Combined materials Composites: mixtures of two or more components, bone Laminates: layered sheets, bark Protective coatings: a thin surface layer of material, cell walls Palm Beetles o When attacked, its adheres to the leaves with 100x their own body weight strength Lotus Leaves o Self-cleaning affect After emerging from mud, they do not retain dirt
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Repels water Materials on top are waxy, which don’t wet Geckos o Hold on by one foot Contact angle o < 90*= wetting Good for coating processes o >90*=non-wetting Good to keep surfaces clean o >150*= Superhydrophobicity Water on lotus leaf Hydrophilic o Water likes glass surface so it spreads out Hydrophobic o Water dislikes wax surface so it beads up Adhesion o The smaller the droplets, the larger adhesion force o Circumference x surface tension Nacre o aka abalone shell 95% chalk + 5% protein Surface Area o (Side * side) * number of sides Buckyballs and AFM- 8?s atomic clusters – how are they made and how do you determine their size what is a buckyball, who made it and who is it named after what is a carbon nanotube, what types are there, how are they made, what are their properties Manipulating nanoparticles what do you use (two different names for it); know the images Atomic clusters o Made from blasting a material w/ a laser, and small Atomic clusters detach o Study sizes by looking in a mass spectrometer o Common stable sizes are 7,13,19 Buckyballs- who made it and who is it named after o C60 cluster was actually a hollow molecule made entirely of carbon atoms joined in hexagons and pentagons. o
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This note was uploaded on 11/01/2010 for the course CHEN 1000 at Colorado.

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Test 3 - Biomimetics- 12 ?s Materials bulk vs. surface...

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