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1、AdsorborAdsorptionTheadhesionofalayerofmolecules(gasorliquid)tothesurfaceofasolid.Adsorbisnotthesameasabsorb,anactioninwhichmoleculesaretakenintoporesinthesurfaceofasolid.Fumedsilicaisnon-porous.AgglomeratesAcollectionofsmallerparticlesheldtogetherbyweakforc
2、es,suchasmechanicalentanglement.Forexample,individualtreebranchestrimmedoffatreeandthrownintoapilewillformanagglomerate.Theagglomeratesformedinthefumedsilicaprocessaregenerallyeasytodisperseandcanbebrokendownbyproperdispersionequipment.Thetypicalmeanagglomer
3、atesizeofCabot'sfumedsilicasis25to30microns.AggregatesAcollectionofsmallerparticlesthathavebeenpermanentlyjoinedtogether.Infumedsilica,theprimaryparticleshavesinteredtogethertoformanaggregate,whichisextremelystrong.ThetypicalmeanaggregatesizeofCabot'sfumedsi
4、licais0.2to0.3microns.Theaggregateisthesmallestparticletowhichfumedsilicacanbedispersed.AmorphousNon-crystalline,nothavingadefiniterepeatingstructure.Glassisanexampleofamorphoussilica.Examplesofcrystallineformsofsilicaarequartz,cristobaliteandtridymite.Amorp
5、houssilicaisverystableanditisimpossibleforittocrystallize,exceptafterexposuretoveryhightemperaturesandpressureforextremelylongperiodsoftime.Anti-blockingThepreventionoffusionorstickingbetweentwosurfaces.Fumedsilicapreventsblockingbyprovidingmicro-roughnessto
6、thesurface,thuspreventingactualcontactbetweenthetwosurfaces.Applicationsforthisareincoatings,plasticfilmsandcontinuousmetalcasters.Anti-cakingTheabilitytopreventtheformationofclumpsinapowder.Fumedsilicapreventscakingoractsasananti-cakingagentindrypowderssuch
7、asthoseusedincosmetics,food,nutraceuticalsandpharmaceuticals.Anti-mistingTheabilitytopreventmisting.Inhighspeedprintingprocesses,suchasgravureandletterpress,smalldropletsofinkcanbethrownfromtherollsbycentrifugalforce,developingamist.Thismistofinkcausescleani
8、ngproblems,anditcanalsocausedirtyprint.Fumedsilicawillreducemistingininksbyprovidingthixotropicbehavior.Anti-sagTheabilitytosupportacertainamountofmaterialagainstthepullofgravityandnothavethemat
