基于纳米薄膜的卷曲微弹簧-研究

《基于纳米薄膜的卷曲微弹簧-研究》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、万方数据一．垒!!!竺!——AbstractMicro／nanostructures，suchasmicro／nano—dots，wires，rodsandsheets，havebeenintenselyinvestigatedduetotheirpotentialapplicationsinthefieldsincludingphysics，optics，sensingandmicroelectronics．Duringthepastdecade，rolled。upnanotechnology,whichtakesadvan

2、tageofbothBottom—UpandTop—Downmethods，hasbeenemployedtofabricateunique3Dmicrostructuresbyrollinguppre—strainednanomembranesuponreleasefromasacrificiallayer．Inthisthesis，novelrolled—upmicrostructureshavebeensuccessfullyfabricatedandtheiruniquepropertieshavebeeninvest

3、igated．Forthefirsttime，Timicrospringswerefabricatedbydeterministicrollingofanisotropicstrain-engineerednanomembranesviaglancingangledeposition(GLAD)．Theparametersofmicrospringscanbewellcontrolled．Thediameterincreaseswiththethicknessincreasing，andthehelicityangleandt

4、hechiralityaredeterminedbythemisalignedanglebetweentheorientationofthestripandthepreferablerollingdirection．AliquidflowratesensorwasdesignedbasedonthatTimicrospringscanbestretchedwhenplacedintoflowwater．TherelationshipbetweentheelongationofTimicrospringsandflowratew

5、asquantativelyanalyzed。ResultsdemonstratethatTimicrospringsshowasuperelasticitybehaviorwithagoodreliability．Polyvinylalcohol-poly(acrylicacid)(PVA—PAA)／metalmicro—scrolls(springsandtubes)werefabricatedbyrolled—upnanotechnology．Stimuli—responsivebehaviorofmicro—scrol

6、lswasdemonstratedbyrollingandunrollingcausedbythevolumechangeofthePVA-PAAhydrogelinresponsetoenvironmentalfluids．Moreover,thestrainofPVA．PAAlayerinmicrotubesandmicrospringsduringthedeformationwascalculated．Itisfoundthatthestraininmicrospringsissmallerthanthatinmicro

7、tubesduetothepartialstrainrelaxationperpendiculartotherollingdirectioninmicrosprings．Keywords：rolled—upnanotechnology，microspring，microtube，superelasticity,stimuli—responsiveCLCNumber：rrN305／TB434万方数据第一章绪论复旦大学硕士学位论文1．1引言近年米，微纳尺度的结构与器件由于其独特的物理、化学性质在各个领域拥有广阔的应用前景，而成为当

8、前的研究热点。典型的微纳结构有以下几种：点结构、线结构、管状结构以及螺旋结构等【1。31。此类微纳结构与器件在能量存储、药物传输、传感、光学以及微驱动等领域具有巨大的发展空间，冈而引起广大科研工作者浓厚的兴趣⋯o】。通常来说，得到微纳结构的途径有两种：白上而下(Top—Dow