微米纳米复合颗粒的制备方法及电磁响应性行为研究

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1、西北工业大学博士学位论文微米纳米复合颗粒的制备方法及电磁响应性行为研究姓名：郭红霞申请学位级别：博士专业：材料物理与化学指导教师：赵晓鹏20030401ABSTRACTPhotoniccrystalshaverecentlybeenstudiedextensivelybecausetheyofferuniquewaysoftailoringthepropagationoflight．Anumberofmethodshavebeendevelopedtocreatetheperiodicstructurespossessingphotonicbandgap(PB

2、@．Somesuccesseshavebeenachievedthroughmicrofabricationtechniques，butthepursuitofamicroscopicallyorderedPBGinthevisiblerangewasstillachallengingendeavor．Colloidalself-assemblyhasbeenutilizedasaprocesstoform3Dperiodicstructuresbecauseofitssimplicity．Avarietyofmethodshavebeenexploredto

3、makephotoniccrystalsmaterialsfromsubmicrometerballsofSi02，polystyrenelatexarrangedinto3Dorderedsll'ucturestoporous，ceramicmaterialstemplatedbythisformed3Dorderedstructuresandoilemulsion．However,theresultingstrainfromshrinkagedistortedthelatticesandsubstantiallydegradedtheopticalprop

4、ertiesofthecolloidalcrystals．Theelectrorheological(ER)orthemagnetorheological(MR)effectoffersauniquetechniquewherebythesuspendedparticlesCanbeself-assembledintobody—centered-tetragonal(bct)mesocrystallitesthroughtheapplicationofanexternalfield㈣2”．WhenERandMReffectsarecombined．thenet

5、workstructureshavebeenformedbyX．EZhaoetai．Thisprovidedausefulmethodtocontrolthebehaviorofparticlessuspendedinfluids．Threestrategiesofsynthesizingcompositeparticlesresponsivetoelectricandmagneticfieldsbycombinationofdifferentcoatingtechniqueshavebeenpresentedinthedissertation．Andthea

6、ssembliesofthepreparedparticlesbroughtabouttheappliedelectricandmagneticfieldswerethereforeexamined．ThefirststrategyisthatthepreparedFe304／PStmagneticpolymersphereswerecoatedbyamorphoustitania，andFe304／PSt／Ti02compositeparticleswereformed．Themorphologyandthestructureoftheparticleswe

7、redeterminedbySEM，FT—IRandTG-DTA．Theresultingcompositeparticlesshowedresponsestobothelectricandmagneticfieldsbythereflectionofformingintochainsstructureswhena0．6kV／mmelectricor300Gs／mmmagneticfieldstrengthwasapplied．IIABSTRACTThesecondstrategyincludethatametallicnickel(Ni)corewasenc

8、apsulatedwithapolym