Synthesis of Mesoporous Silica with CationicAnionic
Surfactants¹

L. Cao^a, J.-G. Shao^b, Y.-B. Yang^a, Y.-X. Yang^a,*, and X.-N. Liu^c

^aDepartment of Chemistry, East China University of Science and Technology, 200237, P. R. China

*e-mail: yuxyang@online.sh.cn

^bCollege of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, 225002, P. R. China

^cAnalysis Test Center, Yangzhou University, Yangzhou, 225009, P. R. China

Received May 28, 2009

Abstract—Ordered mesoporous silica was successfully synthesized by using mixed surfactants, cetyltrimeth-
ylammonium bromide and sodium dodecylsulfate, proceeded with the hydrolysis and condensation of tetra-
ethyl orthosilicate in a mixture of TritonX-100 as a cosolvent. The synthesized products were characterized by
X-ray diffraction patterns (XRD), scanning electron microscopy (SEM), transmission electron microscopy
(TEM), and nitrogen sorption analysis. It was found with increasing the anionic surfactant sodium dodecylsul-
fate to cetyltrimethylammonium bromide molar ratio, the morphologies of mesoporous silica changed from
spherical shape to ellipsoidal shape, at last became rod-like and lamellar shape. Correspondingly the pore diam-
eter and surface area of mesoporous silica all decreased according to nitrogen sorption analysis. The TEM anal-
ysis illustrated the product with ordered hexagon mesostructure and homogeneous pore arranged can be
obtained, when the molar ratio of cetyltrimethylammonium bromide/sodium dodecylsulfate is 15 : 1. It also
demonstrated the less the molar ratio of sodium dodecylsulfate was used, the more ordered pore structure the
products exhibited. Furthermore, prolonging the crystal time was beneficial to improve the stability of the prod-
uct.

Key words: mixed surfactants, mesoporous, silica

DOI: 10.1134/S1087659610020069

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