单分散纳米二氧化硅的制备与分散性研究

Abstract

Abstract: In order to obtain monodisperse silica nanoparticles,and to improve the dispersion of silica nanoparticles in organic solvents，silica nanoparticles were successfully prepared by improved sol-gel method.Influences of R ratio\[R=c(H₂O)/c(TEOS)\],ammonia concentration,TEOS concentration,and temperature on the particle size of nano-sized SiO₂were studied.Morphology and particle size were characterized by TEM.It was found that the particle size of nano-sized silica increased with the increasing of R ratio,ammonia concentration,and TEOS concentration,however,decreased with the increasing of reaction temperature.Then,the prepared silica nanoparticles were modified by using amphiphilic polyesters obtained by polycondensation of polyethyleneglycol and sebacic acid.Structure and dispersivity of the modified and unmodified nano-sized silica were characterized by FT-IR,TG,and TEM.Results showed that the modified nano-sized SiO₂ had a better dispersion in toluene.

Key words: sol-gel method, nano-sized silica, amphiphilic polyesters, toluene

CLC Number:

TQ127.2

WANG Peng-Cheng, LIU Song, LIU Meng-Xi. Study on preparation and dispersivity of monodisperse silica nanoparticles[J]. INORGANICCHEMICALSINDUSTRY, 2011, 43(2): 40-.

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Inorganic Acid-Base-Salt Committee of CIESC

Study on preparation and dispersivity of monodisperse silica nanoparticles

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