Abstract
In this paper, we have developed a facile MgCl2-assissted hydrothermal synthesis route to grow tubular aragonite whiskers on a large scale. The products have been characterized by powder X-ray diffraction (XRD), optical microscopy, and scanning electronic microscopy (SEM). The results show the as-grown product is pure tubular aragonite crystalline whiskers with a diameter of 5–10 μm and a length of 100–200 μm, respectively. The concentration of Mg2+ plays an important role in determining the quality and purity of the products. Furthermore, the method can be extended to fabricate CaSO4 fibers. The high quality of the product and the mild conditions used mean that the present route has good prospects for the growth of inorganic crystalline whiskers.
Highlights
As an important inorganic material, calcium carbonate (CaCO3) has been widely used as fillers in paper making, plastics, rubbers and coating due to its low price and richness in the world [1,2].addition of such fillers beyond a certain level sometimes causes some problems such as reduced paper strength and stiffness
Crystalline whiskers with high aspect ratio, Materials 2011, 4 excellent mechanical properties, and perfect structures represent an ideal class of candidates as reinforcement in composite materials
The phase and morphology of the products have been determined by X-ray powder diffraction (XRD) and optical microscopy and scanning electronic microscopy (SEM)
Summary
As an important inorganic material, calcium carbonate (CaCO3) has been widely used as fillers in paper making, plastics, rubbers and coating due to its low price and richness in the world [1,2]. Hou’s group [16] produced aragonite rods in water/pyridine solution under solvothermal conditions These methods require a long time to get the desired product. We have developed a convenient hydrothermal route with the assistance of magnesium chloride (MgCl2) to grow pure aragonite tubular whiskers using urea ((NH2)2CO) and calcium chloride (CaCl2) as starting materials. The influencing factors such as concentration, time, and Mg2+ additive have been investigated. The high quality of whiskers, environmental benignity and low-temperature used mean the present method is promising in industrial applications
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