Synthesis of Al2O3 Nanofibers with Ionic Liquids as Both the Template and Aluminum Source†

doi:10.7503/cjcu20150970

Abstract

Abstract:

Al₂O₃ nanofibers were synthesized with aluminum chloride acid type ionic liquids xAlCl₃-[C₁₀mim]Cl([C₁₀mim]Cl is 1-decyl-3-methylimidazolium chloride, x is the molar fraction of AlCl₃ in the ionic liquid) as both the template and aluminum source via sol-gel method. The effects of the molar fraction of aluminum chloride acid and calcination temperature on the alumina morphology were mainly studied. The obtained products were characterized by means of X-ray diffraction(XRD), transmission electron microscopy(TEM) and N₂ adsorption-desorption. The results suggested that xAlCl₃-[C₁₀mim]Cl could act as not only the aluminum sources but also the template to control the alumina morphology. When the molar fraction of aluminum chloride acid was 0.5, Al₂O₃ nanofibers could be synthesized with the diameter of 2 nm, the length of about 200 nm, the surface area of 238.38 m²/g, the pore volume of 0.54 cm³/g and the mean pore diameter of 8.43 nm. The Al₂O₃ nanofibers could maintain the fiber morphology and γ-Al₂O₃ crystalline phase even under 900 ℃, indicating that the Al₂O₃ nanofibers had relatively high thermal stability. Furthermore, the hydrogen bond-co-π-π stack mechanism was proposed to explain the formation of Al₂O₃ nanofibers.

Key words: Ionic liquid, Template, Aluminum source, Alumina, Nanofiber

CLC Number:

O611.62

TrendMD:

LIU Tuanchun, TANG Shaokun, JI Xiaowei, HAN Pei. Synthesis of Al₂O₃ Nanofibers with Ionic Liquids as Both the Template and Aluminum Source^†[J]. Chem. J. Chinese Universities, 2016, 37(5): 817.

Figures/Tables 7

Fig.1 TEM images of MA-0.25-500(A), MA-0.5-500(B) and MA-1.0-500(C)

Fig.2 N2 adsorption-desorption isotherms(A) and pore diameter distribution(B) of MA-0.25-500, MA-0.5-500 and MA-1.0-500

Table 1 Pore parameter of the synthesized samples

Sample	S_BET /(m²·g^-1)	V_p/(cm³·g^-1)	D_p/nm
MA-0.25-500	263.26±0.36	0.71	10.39
MA-0.5-500	238.38±0.26	0.54	8.43
MA-0.5-700	234.56±0.24	0.45	7.30
MA-0.5-900	246.05±0.23	0.53	8.31
MA-1.0-500	274.19±0.57	0.52	7.41

Fig.3 TEM images of MA-0.5-500(A), MA-0.5-700(B) and MA-0.5-900( C)

Fig.4 XRD patterns of MA-0.5-500(a), MA-0.5-700(b) and MA-0.5-900(c)

Fig.5 N2 adsorption-desorption isotherms(A) and pore diameter distributions(B) of MA-0.5-500, MA-0.5-700 and MA-0.5-900

Fig.6 Scheme of the formation of Al2O3 nanofibers

References 16

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Synthesis of Al₂O₃ Nanofibers with Ionic Liquids as Both the Template and Aluminum Source^†

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