Morphological Transformation of Mesoporous Silica Using Binary Cationic-anionic Surfactant as Template†

doi:10.7503/cjcu20140371

Abstract

Abstract:

Mesoporous silica with various morphologies were obtained using binary cationic-anionic surfactant as template after a facile hydrothermal treatment. Cetyltrimethyl ammonium bromide(CTAB) and sodium dodecyl sulfonate(SDS) were selected as cationic and anionic structure direct agent respectively. Mechanism of morphological control during this process was investigated by regulating the molar ratio of SDS/CTAB. The as-synthesized samples were characterized by scanning electron microscopy(SEM), small angle X-ray diffraction(SXRD), transmission electron microscopy(TEM) and nitrogen adsorption-desorption isotherms measurements. Formation of the different stable morphologies were attributed to the structural transition of SDS/CTAB assembly from micelle to bilayer commitment with the ascending ratio of SDS.

Key words: Morphological control, Mesoporous silica, Cationic-anionic surfactant, Structural transition, Assembly

CLC Number:

O613.72

TrendMD:

PENG Ce, MU Mingwei, XIE Shihang, CAI Qiang. Morphological Transformation of Mesoporous Silica Using Binary Cationic-anionic Surfactant as Template^†[J]. Chem. J. Chinese Universities, 2014, 35(9): 1864.

Figures/Tables 10

Fig.1 XRD patterns of as-synthesized samples with various R values R: a. 0.01; b. 0.05; c. 0.10; d. 0.14.

Fig.2 TEM images of as-synthesized samples with various R values R: (A) 0.01; (B) 0.05; (C) 0.10; (D) 0.14.

Fig.3 Concentric morphological transition with different R values R: (A) 0.08; (B) 0.14; (C) 0.16, the inset shows the low-magnification image.

Fig.4 XRD patterns of as-synthesized sample with various R values R: (A) a. 0.20, b. 0.24, c. 0.28; (B) a. 0.32, b. 0.40, c. 0.42, d. 0.48.

Fig.5 TEM images of samples with various R values R: (A) 0.20; (B) 0.24; (C) 0.28.

Fig.6 TEM images of samples with R values of 0.32(A) and 0.40(B)

Fig.7 Morphological transition of silica from R=0.42 to R=0.48 (A) R=0.42, TEM; (B) R=0.48, TEM; (C) R=0.48, SEM.

Table 1 Silica samples prepared with different typical R values

R	Morphology	d₁₀₀/nm	S_BET/(m²·g^-1)	BJH pore width/nm	BJH pore volume/(cm³·g^-1)
0.01	Hexagonal	3.65	1033.78	2.67	0.781
0.10	Hexagonal rod	3.68	971.01	2.84	0.763
0.14	Hexagonal fiber, concentric	3.71	921.40	2.94	0.707
0.32	Multilayer vesicle	3.70	702.59	1.8~2.7	0.681
0.40	Monolayer vesicle	5.0	626.89	3.78, 29.65	1.129
0.48	Inverted micelles		491.19	44.66	2.542

Fig.8 N2 adsorption-desorption isotherms of as-synthesized typical samples with various R values(A, B) and pore size distribution of sample with R=0.48(inset) AD: adsorption; DE: desorption.

Fig.9 Linear fitting of BET surface area of the as- synthesized samples with different R values

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