3. ResultsanddiscussionThis section

3. Resultsanddiscussion
This sectioncoverstheexperimentalworkdoneduringthis
study.Resultsofexperimentslikestabilityinvestigation,interfacial
and adsorptionmeasurementsarediscussed.
3.1.Nanoparticlesuspensionstability
In thissection,wearemainlyconcernedwithdispersionsof
colloidal solidparticlesinliquids.Themainpointisthatifthe
dispersion remainsindispersedstateundertheexperiment
conditions or flocculation andcoagulationtakeplace.Twocases
of aqueoussuspensionstabilitywithoutanyadditivesandwith
surfactant additionwereconsidered.
While theaqueoussuspensionsofAEROSIL300hydrophilic
nanoparticles remainedstableformorethanonemonthmainly
due totheirtinysize,slightlyhydrophobicAEROSILR816nano-
particle suspensionstendedtoagglomerateafterashortperiodof
twotothreedays.Thisphenomenonmayberelatedtothe
hydrophobicchainattachedtonanoparticlesurfacewhichmakes
the aqueousbulksolutiontobeanunfavorableenvironmentfor
individualparticles.Asaresult,nanoparticlesbegintoagglomer-
ate and finally settleduetogravitationalforces.
Addition ofSDSanionicsurfactanttonanoparticlesuspensions
extendedthestabilityperiodforbothnanoparticlesespeciallyin
the caseofAEROSILR816andnoagglomerationoccurred. Fig. 2
representsbothagglomeratedandstabilizedsuspensionsfor
slightly hydrophobicR816nanoparticles.Flocculatedandagglom-
eratedparticleswereobservedintheabsenceofsurfactant(left).
By theinclusionofsurfactantmolecules(right),however,the
suspension remainedinstableconditionforalongperiodand
no coagulationwasobserved(Thesuspensionwascompletely
clear). Thestabilityimprovementofnanoparticlesuspensionsmay
be interpretedthroughtheadsorptionofSDSonnanoparticle
surface, bringingaboutsuperchargedsystembyincreasingthe
effectivechargeofsilicaandconsequentlystabilizethesystem
(Ahualli etal.,2011;Luoetal.,2009). InthecaseofAEROSILR816

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3. ResultsanddiscussionSectioncoverstheexperimentalworkdoneduringthis นี้ศึกษา Resultsofexperimentslikestabilityinvestigation, interfacialและ adsorptionmeasurementsarediscussed3.1.Nanoparticlesuspensionstabilityใน thissection, wearemainlyconcernedwithdispersionsofcolloidal solidparticlesinliquids Themainpointisthatiftheremainsindispersedstateundertheexperiment เธนเงื่อนไขหรือ flocculation andcoagulationtakeplace Twocasesของ aqueoussuspensionstabilitywithoutanyadditivesandwithsurfactant additionwereconsideredในขณะที่ theaqueoussuspensionsofAEROSIL300hydrophilicเก็บกัก remainedstableformorethanonemonthmainlyครบกำหนด totheirtinysize, slightlyhydrophobicAEROSILR816nano -suspensionstendedtoagglomerateafterashortperiodof อนุภาคtwotothreedays Thisphenomenonmayberelatedtothehydrophobicchainattachedtonanoparticlesurfacewhichmakesaqueousbulksolutiontobeanunfavorableenvironmentforindividualparticles Asaresult, nanoparticlesbegintoagglomer-กิน และสุดท้าย settleduetogravitationalforcesนอกจากนี้ ofSDSanionicsurfactanttonanoparticlesuspensionsextendedthestabilityperiodforbothnanoparticlesespeciallyincaseofAEROSILR816andnoagglomerationoccurred Fig. 2representsbothagglomeratedandstabilizedsuspensionsforเล็กน้อย hydrophobicR816nanoparticles.Flocculatedandagglom-eratedparticleswereobservedintheabsenceofsurfactant(left)โดย theinclusionofsurfactantmolecules (ขวา), อย่างไรก็ตาม การremainedinstableconditionforalongperiodand ระงับไม่ coagulationwasobserved (Thesuspensionwascompletelyล้าง) Thestabilityimprovementofnanoparticlesuspensionsmayสามารถ interpretedthroughtheadsorptionofSDSonnanoparticleพื้นผิว bringingaboutsuperchargedsystembyincreasingtheeffectivechargeofsilicaandconsequentlystabilizethesystem(Ahualli etal., 2011 Luoetal., 2009) InthecaseofAEROSILR816

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3. Resultsanddiscussion
นี้ adsorptionmeasurementsarediscussed. 3.1.Nanoparticlesuspensionstability ใน thissection, wearemainlyconcernedwithdispersionsof solidparticlesinliquids.Themainpointisthatifthe คอลลอยด์remainsindispersedstateundertheexperiment กระจายเงื่อนไขหรือตะกอนandcoagulationtakeplace.Twocases ของ aqueoussuspensionstabilitywithoutanyadditivesandwith ลดแรงตึงผิว additionwereconsidered. ในขณะที่ theaqueoussuspensionsofAEROSIL300hydrophilic อนุภาคนาโน remainedstableformorethanonemonthmainly totheirtinysize เนื่องจาก slightlyhydrophobicAEROSILR816nano- อนุภาค และในที่สุดก็ settleduetogravitationalforces. เพิ่ม caseofAEROSILR816andnoagglomerationoccurred รูป 2 representsbothagglomeratedandstabilizedsuspensionsfor เล็กน้อย theinclusionofsurfactantmolecules (ขวา) แต่ระงับremainedinstableconditionforalongperiodand coagulationwasobserved ไม่มี (Thesuspensionwascompletely ชัดเจน) Thestabilityimprovementofnanoparticlesuspensionsmay จะ interpretedthroughtheadsorptionofSDSonnanoparticle ผิว etal 2011.. Luoetal 2009) InthecaseofAEROSILR816

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3 . resultsanddiscussion นี้ sectioncoverstheexperimentalworkdoneduringthis

เรียน resultsofexperimentslikestabilityinvestigation ระหว่างผิวหน้าและ adsorptionmeasurementsarediscussed
.
3.1 nanoparticlesuspensionstability
ใน thissection wearemainlyconcernedwithdispersionsof
คอลลอยด์ , solidparticlesinliquids themainpointisthatifthe กระจาย remainsindispersedstateundertheexperiment

.เงื่อนไข หรือรวมตะกอน andcoagulationtakeplace . twocases aqueoussuspensionstabilitywithoutanyadditivesandwith

ของสารลดแรงตึงผิว additionwereconsidered .


เนื่องจากในขณะที่ theaqueoussuspensionsofaerosil300hydrophilic นาโน remainedstableformorethanonemonthmainly totheirtinysize slightlyhydrophobicaerosilr816nano , อนุภาค suspensionstendedtoagglomerateafterashortperiodof
-
twotothreedays .thisphenomenonmayberelatedtothe


hydrophobicchainattachedtonanoparticlesurfacewhichmakes aqueousbulksolutiontobeanunfavorableenvironmentfor individualparticles . asaresult nanoparticlesbegintoagglomer , -
กิน และสุดท้าย settleduetogravitationalforces .
2

ofsdsanionicsurfactanttonanoparticlesuspensions extendedthestabilityperiodforbothnanoparticlesespeciallyin