Controllable Fabrication of Calcium Carbonate Hollow Microspheres with Micro-nano Hierarchical Structure

doi:10.15541/jim20150660

Abstract

Abstract:

With polyvinyl pyrrolidone (PVP) and sodium dodecyl sulfonate (SDSN) as the template, calcium carbonate hollow microspheres with micro-nano hierarchical structure were successfully synthesized using sodium carbonate and calcium chloride as starting materials through a precipitation reaction method at reaction temperature of 50℃. The products were characterized by scanning electronic microscopy (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD) and other detection methods. The results show that the hollow calcium carbonate microspheres with micro-nano hierarchical structure are about 4-6 μm in diameter. The shell thickness of calcium carbonate hollow microspheres is about 200 nm, which consists of calcium carbonate particles with size about 60 nm. The phase of calcium carbonate hollow microspheres is composed of calcite and vaterite. Excellent dispersibility and spherical morphology of calcium carbonate hollow microspheres can be achieved with addition of 0.1 mol/L SDSN and 0.4 g PVP consequently.

Key words: micro-nano hierarchical structure, calcium carbonate hollow microspheres, mechanism, template

CLC Number:

R318

ZOU Jian-Peng, YANG Hong-Zhi, XIAO Ping, PAN Yi-Feng. Controllable Fabrication of Calcium Carbonate Hollow Microspheres with Micro-nano Hierarchical Structure[J]. Journal of Inorganic Materials, 2016, 31(7): 711-718.

Figures/Tables 11

Fig. 1 The flow chart of reaction

Fig. 2 SEM micrographs of calcium carbonate hollow microspheres with micro-nano hierarchical structure

Fig. 3 TEM micrographs of calcium carbonate hollow microspheres with micro-nano hierarchical structure a: Morphology of calcium carbonate hollow microspheres; b: Morphology of nano-calcium carbonate on the micro-spherical shell wall; c: Electron diffraction pattern of calcium carbonate hollow microspheres; d: Crystal calibration in HRTEM)

Fig. 4 XRD patterns of calcium carbonate hollow microspheres with micro-nano hierarchical structure

Fig. 5 XRD patterns of calcium carbonate hollow microspheres with micro-nano hierarchical structure at different additives

Fig. 6 IR spectrum of calcium carbonate hollow microspheres with micro-nano hierarchical structure

Fig. 7 Influence of the reaction temperature on calcium carbonate hollow microspheres with micro-nano hierarchical structure (a) 20℃; (b) 40℃; (c) 60℃; (d) 80℃

Fig. 8 Influence of the concentration of SDSN on calcium carbonate hollow microspheres with micro-nano hierarchical structure (a) 0.08 mol/L; (b) 0.1 mol/L; (c) 0.12 mol/L; (d) 0.14 mol/L

Fig. 9 Influence of the additive of PVP on calcium carbonate hollow microspheres with micro-nano hierarchical structure (a) 0.32 g; (b) 0.4 g; (c) 0.8 g; (d) 1.2 g

Table 1 Standard thermodynamic data of related compounds

Fig. 10 The mechanism diagram of being modulated by SDSN and PVP for preparation of calcium carbonate hollow microspheres with micro-nano hierarchical structure

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