材料科学英语Unit 6 Lecture 3 What lessons can we learn from nature.pptx

Unit6BiomimeticsandMaterials1TextAIntelligentclothingTextBWhatlessonscanwelearnfromnature?

Lecture3Whatlessonscanwelearnfromnature?Objectives:1.“Biomimeticproducts”basedonthelotuseffect2.Otherexamplesofproductsmimickingnature’sprinciples2

Part1“Biomimeticproducts”basedonthelotuseffect

Thelotuseffect

ThelotuseffectAlotusleafhasadoublelayeroftextures: Theleavesarecoatedwithnanoscopicallytinybumps; thebumpsare,themselves,coveredwithathinlayerofwax; waxymicroscopicbumpsarecoveredinnanoscalehairs whichtrapathinfilmofair.Thelotusthenhasacleverbuilt-inmechanismthatnaturallykeepitclean: Dirtparticlesbalanceprecariouslyonthewaxybumpsbut nevergetareallygoodgriponthemainsurfaceofthe leavesbelow.Whenitrains,hardlyanywatercomesinto contactwiththesurface,anddropletsrollstraightoff, takingdirtparticleswiththemandwashtheleavesclean.

GarmentwithnanofiberscanbecleanedmoreeasilyNanofibersmayalsobeusedtocollectwaterinasustainablewayTheinspirationoflotuseffectforinventors

TheinspirationoflotuseffectforinventorsClothingmanufacturersarenowcoatinggarmentslikeskatepantswithnanofiberssothatdirtisheldslightlyapartfromthemainfabric,andthus,stainscannotpenetratedeeply.Peoplecanseethepromiseofcollectingwaterinawaythatssustainableandnotexpensive,whichpotentiallycansolvetheproblemofdrought.

Part2Otherexamplesofproductsmimickingnature’sprinciples

1.Birdsandairplanes

inventionsinventorssourceofinspirationpioneeringtrialsengine-poweredairplanestheWrightbrothersBirdsflywiththehelpoftheirwingsOttoLilienthal10

2.wormburrowingandtunnelconstruction

inventionsinventorssourceofinspirationanewwayofdiggingtunnelsunderwaterMarcIsambardBrunelWatchingawormburrowingthroughthewoodenplanksofaship12

3.strayburrsandthefa