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1、AdsorborAdsorptionTheadhesionofalayerofmolecules(gasorliquid)tothesurfaceofasolid.Adsorbisnotthesameasabsorb,anactioninwhichmoleculesaretakenintoporesinthesurfaceofasolid.Fumedsilicaisnon-porous.AgglomeratesAcollectionofsmallerparticlesheldtogetherbywe
2、akforces,suchasmechanicalentanglement.Forexample,individualtreebranchestrimmedoffatreeandthrownintoapilewillformanagglomerate.Theagglomeratesformedinthefumedsilicaprocessaregenerallyeasytodisperseandcanbebrokendownbyproperdispersionequipment.Thetypical
3、meanagglomeratesizeofCabot'sfumedsilicasis25to30microns. AggregatesAcollectionofsmallerparticlesthathavebeenpermanentlyjoinedtogether.Infumedsilica,theprimaryparticleshavesinteredtogethertoformanaggregate,whichisextremelystrong.Thetypicalmeanaggregates
4、izeofCabot'sfumedsilicais0.2to0.3microns.Theaggregateisthesmallestparticletowhichfumedsilicacanbedispersed.Amorphous Non-crystalline,nothavingadefiniterepeatingstructure.Glassisanexampleofamorphoussilica.Examplesofcrystallineformsofsilicaarequartz,cris
5、tobaliteandtridymite.Amorphoussilicaisverystableanditisimpossibleforittocrystallize,exceptafterexposuretoveryhightemperaturesandpressureforextremelylongperiodsoftime.Anti-blockingThepreventionoffusionorstickingbetweentwosurfaces.Fumedsilicapreventsbloc
6、kingbyprovidingmicro-roughnesstothesurface,thuspreventingactualcontactbetweenthetwosurfaces.Applicationsforthisareincoatings,plasticfilmsandcontinuousmetalcasters.Anti-cakingTheabilitytopreventtheformationofclumpsinapowder.Fumedsilicapreventscakingorac
7、tsasananti-cakingagentindrypowderssuchasthoseusedincosmetics,food,nutraceuticalsandpharmaceuticals. Anti-mistingTheabilitytopreventmisting.Inhighspeedprintingprocesses,suchasgravureandletterpress,smalldropletsofinkcanbethrownfromtherollsbycentrifugalfo
8、rce,developingamist.Thismistofinkcausescleaningproblems,anditcanalsocausedirtyprint.Fumedsilicawillreducemistingininksbyprovidingthixotropicbehavior.Anti-sagTheabilitytosupportacertainamountofmaterialagainstthepullofgravityandnot haveth
