二氧化硅粒径对酸性硅溶胶稳定性的影响

JournalofEastChinaUniversityofScienceandTechnologyVol.29No.62003212E-mail:[e-mail]:2002212204:(19772),,,:100623080(2003)06206422043,,,(,201800):,,,:;;;:TQ127.2:AEffectofDiameterofSiliconDioxideParticleonStabilityofAcidicSilicaSolXUNian2qiang3,GUJian2xiang,LUOKang,ZHENGSong2bao(ShanghaiInstituteofNuclearResearch,theChineseAcademyofSciences,Shanghai201800,China)Abstract:Fromthestudyoftherelationshipbetweenthestabilityandviscosityofacidicsilicasolandthegraindiameterofnanonsilicondioxideparticleindifferentconditions,wefoundthatthestabilityandviscosityofsaidsolwouldimprovewiththeincreasingofthediameterofsaidparticle.Anditiscrucialtoincreasethediameterofsaidparticleforthepreparationofhighconcentrationandlowviscosityacidicsilicasol.Keywords:acidicsilicasol;graindiameter;stability;silicondioxidepH,,,,,[15],,,11.1,,PHS23TC(),NDJ21(246)():wSiO2=0.10.45,pH18,530nm;1.2(1):(wNaCl=0.2),,pH4.09.0,S,(2)pH18,7.810.520.425.0nm(wSiO2=0.25)32200mL,500mL,100C,,()pH,1(a)(3)5.47.810.515.020.425.0nm(wSiO2=0.30,pH=2)6200mL,500mL,100C,,1(b)1(d)Fig.1Theeffectofdiameter(d)onstabilityofacidicsilicasol(4)5.410.520.4nm,pH26(200mL)18500mL,,6NaCl,0,0.0010.0050.010.050.1molöL100C,,2(5)5.410.520.425.0nm,pH2,wSiO2=0.10.45,25C,32Fig.2Theeffectofsaltconcentrationonthestabilityofacidicsilicasol3Fig.3Theeffectofconcentrationofsilicondioxideonviscosityofsilicasol3466:22.11(a),pH2.0,pH;2pH4,;pH56,[5],,,,,,,,pH,,pH,;pH,1(b),S,,,,1020nm,,[12]2,,,,,0.1molöL,15%(220.4nm),500Lgög,,,,,;,,,2.23,,,4,,10.4nm,,;25.0nm,Einstein(1)(2)[6]:,,,r,,,,,10.4nm25.0nm,wSiO2=0.4,25C,30mPas,5mPasGr=1+2.5+J216õ5(1)Gr-G0G0=2.551+1G0r2kEN2P2(2)Grr,J[6]DLVO[7],(),E54Fig.4Thepictureofsilicasol44629ER,EAET(ER+EA)(3):ET=EA+ER=-A012H+64KTn0J2PaC20e-JH(3)5(1),ETC0(C0),,,,(C0),,,,,ET(C),,,,,C0a,,,C0,,,,,,,,,,,,5Fig.5Therelationshipbetweenactionenergyanddistanceoftwoparticles,,,,:[1],,,.[J].,1990,26(4):6542659.[2],,,.[J].,1992,28(2):2502254.[3].[J].,1989,(3):45249.[4].[J].,1996,(2):27229.[5],.pH[J].,1995,29(6):3262328.[6],.()[M].:,1997.[7].[M].:,1978.,(,200237):,,,,1.0(gg),800C,,5466: