納米碳酸鈣-表面活性劑混合體系的泡沫性能研究.pdf

1、江南大學(xué)碩士學(xué)位論文納米碳酸鈣表面活性劑混合體系的泡沫性能研究姓名：崔燕貞申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：應(yīng)用化學(xué)指導(dǎo)教師：崔正剛20090701AbstractAbstractRecentlyithasbeenshownthatnanoparticleswhicharepartiallywaterwettableandpartiallyoil—wettablearesurfaceactive，or也eycanabsorboraggregate

2、atfluidfluidinterfacesalmostirreversiblyandactasemulsionandfoalnstabilizersTheemulsionsandfoamsstabilizedbysuchnanoparticlesareusuallysuperstableandarepracticallysignificantHowevermostnaturalnanoparticlesarenotsurfaceact

3、iveduetotheireitherextremehydrophilicityorextremehydrophobicityOntheotherhand，thesenanoparticlestendtoadsorbamphiphiliccompoundssuchassurfactantsinaqueousmedialeadingtoachangeoftheirsurfacewettabilityandthusbeinginsitusu

4、rfaceactivatedInthispaperwetrytostudythepossibilityofinsitusurfaceactivationofcalciumcarbonatenanoparticlebytheinteractionwithvarioussurfactantsinaqueousmediav／aexaminingthefoamabilityandfoamstabilityofcalciumcarbonatena

5、noparticlesurfactantmixturesInthecasethattheinsitusurface—activationtakesplace，themechanismisrevealedbyexaminingormeasuringdispersionstabilityzetapotentialoftheparticles，adsorptionofsurfactantsatparticle／waterinterface，p

6、articlespercentageadsorbedatair／waterinterfaceinfoamsandcontactanglesTheresultsshowthatthecalciumcarbonatenanoparticlesarepositivelychargedintheneutralwaterwhicharestronglyhydrophilicandarepoorfoamingagentorfoamstabilize

7、rsolelyInaqueousmedialowconcentrationofcationicsurfactantCTABandnonionicsurfactantTX10or0P10ingeneralcallnotinsitusurfaceactivatetheparticlesornosynergisticeffectsinfoamabilityorfoamstabilitywereobservedformixturesystems

8、ofparticleswiththesesurfactantsinaqueoussolutionsThereasonisprobablythatthesesurfactantsCallnotformamonolayerwithhydrocarbonchaintowardswateratparticlessurfaceviaadsorptionsoastoincreasethehydrophobicityoftheparticlesurf

9、aceAnionicsurfactantSDS，however，canformsuchamonolayerbyadsorptionv／aelectrostaticinteractionTheparticlesurfaceisthuscoveredbyalayerofhydrocarbonchainandbecomesohydrophobicthattheparticlestendtoadsorboraggregateontotheair

10、／waterinterfacetostabilizefoamsByadding01MNaCltheadsorptionofSDSatparticle／waterinterfaceincreasesandtheSDSconcentrationrangewheretheparticleswereinsitusurface—activatedorsynergisticeffectsinfoamabilityandfoamstabilitywe

11、reobserveddecreases。黝，enSDSconcentrationincreasestonearorbeyonditscmc，double1ayerorhemimicelleadsorptionoccursatparticle／waterinterfaceduetochainchaininteractiontheparticlesurfaceisreturnedtohydrophilicandparticleslosesu

12、rfaceactivity1f11efoamabilityandfoamstabilityofparticleSDSmixturesystemsdropdownAnionicsurfactantAOTalthoughwithdoublehydrocarbonchainsandstronglyadsorbatparticle／waterinterfaceisnotaseffectiveasSDSiIlinsitusurfaceactiva

13、tingtheparticlesThereasonisprobablythatthehydrophobicityoftheparticlessurfacecannotbeeffectivelyincreasedduetotheshorthydrocarbonchain，largermolecularsectionareaandeasilytoformdoublelayerorhemimicelleadsorptionatlowconce