Facile preparation of CaCO3 nanoparticles with self-dispersing properties in the presence of dodecyl dimethyl betaine

doi:10.1016/j.colsurfa.2006.10.045

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Volume 297, Issues 1–3, 5 April 2007, Pages 179-182

https://doi.org/10.1016/j.colsurfa.2006.10.045 Get rights and content

Abstract

CaCO₃ nanoparticles with about 50 nm in size could be prepared by carbonation reaction of a mixture of Ca(OH)₂ and dodecyl dimethyl betaine (BS-12) via bubbling CO₂ gas. The samples were characterized by transmission electron microscopy (TEM), photon correlation spectroscopy (PCS) and photograph. The results indicate that the CaCO₃ powder samples can self-diffuse in water, thus forming a suspension with enhanced stability and longevity. Fourier transform infrared spectroscopy (FT-IR) of the CaCO₃ particles showed the appearance of the alkyl groups from BS-12. The CaCO₃ nucleated in the presence of BS-12 exhibited different endothermic peak compared to one nucleated in the absence of BS-12 in thermal gravimetric analysis (TGA). We have succeeded in surface modification of CaCO₃ with BS-12. The presence of BS-12 accelerates the period of absorption and shortens the time of carbonation.

Introduction

CaCO₃ is the cheapest commercially available inorganic particles, and has been extensively used in many industrial products such as paints, inks, papers, plasticizers, and so on. However, a key problem remains: can CaCO₃ be dispersed stably and homogeneously in media? The development of many novel materials requires smaller sized particles and good dispersing properties in water, to form a stable suspension [1], [2], [3], [4]. Recently, the synthesis of organic–inorganic hybrids by mimicking biomineralization has attracted great attention [5], [6]. It has been known that organic additives introduced to the crystallization processes of CaCO₃ modified the shapes of crystals and retarded nucleation and growth rate [7], [8], [9], [10], [11], [12], [13], [14], [15]. However, these are not yet the reports about that the organic additive cannot only control the particle size and shape but also render CaCO₃ with self-dispersing property in situ. Synthesis of CaCO₃ was followed by two basic synthetic routes: the solution route and the carbonation route. The carbonation method is an industrially useful method and preferred in terms of environment preservation, but it is difficult to control the crystal shape and modification of CaCO₃. In the study, we studied the crystallization of CaCO₃ in the presence of BS-12 by a carbonation route mimicking the essential functions of biomineralization, and the self-dispersing CaCO₃ nanoparticles were obtained in this procedure.

Section snippets

Experimental

All of the chemical reagents used were of analytical grade in this experiment. The procedure employed for the synthesis of CaCO₃ was as follows. The 10 g of CaO was digested in 100 ml of 80 °C distilled water to form Ca(OH)₂ slurry. After a day, the slurry was filtered through a 200 meshes sieve in order to remove the impurity and large particles and then transferred into a 250 ml three-necked flask. After addition of BS-12 into the flask, the mixture was stirred vigorously for 1 h at room

Results and discussion

From Fig. 1a we could see that the spindle-like CaCO₃ with the diameter of about 100 nm (the ratio of diameter to length about 1:4) were obtained in the absence of BS-12. However, in the presence of BS-12, the cubic-like CaCO₃ in the average particle size of about 50 nm were synthesized as shown in Fig. 1b. In this reaction, the little cubic-like crystals formed in initial stage. The BS-12 used in this study could accelerate the carbonation and improve the speed of nucleation (see Fig. 7). So the

Conclusion

We have succeeded in surface modification of CaCO₃ particles in situ with BS-12 in aqueous solution at room temperature. The BS-12 was used in carbonation process to control the particle size and shape and modify the surface of CaCO₃ particles simultaneously. In this study the cubic-like CaCO₃ particles in the average size of about 50 nm can be synthesized. A suspension of CaCO₃ can be formed by self-dispersing of the powder in water, which has enhanced stability and can be preserved for a long

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Facile preparation of CaCO3 nanoparticles with self-dispersing properties in the presence of dodecyl dimethyl betaine

Abstract

Introduction

Section snippets

Experimental

Results and discussion

Conclusion

Colloids Surf.

Geochim. Cosmochim. Acta

J. Cryst. Growth

J. Cryst. Growth

J. Cryst. Growth

J. Cryst. Growth

J. Membr. Sci.

J. Shenyang Pharm. Univ.

Facile preparation of CaCO₃ nanoparticles with self-dispersing properties in the presence of dodecyl dimethyl betaine