Abstract
Bariu m carbonate (BaCO3) microstructures have been synthesized in aqueous solution under ambient condi- tions with PABA (p-amino benzoic acid) and HEEDTA (N-(2 hydroxyethyl) ethylenediamine-N, N', N '' - triacetic acid) as simp le additives. In this study we demonstrate that the integration of both the additives, PABA and HEEDTA under different experimental conditions, such as crystallization sites and pH will extend the possibilities for controlling the shape and size on microstructures of the inorganic crystals by means of a slow CO2 simple d iffusion route. The influence of variation of pH condition with two different additives on the particle size and morphology was investigated. Scanning electron microscopy, Fourier transform infrared spectroscopy and X-ray powder diffracto metry were used to characterize the products. The results indicate that bunch like dendrit ic and limpet teeth shaped, BaCO3 microstructures were obtained. Increasing pH led to the separation of rods from the co mplex structures.
Highlights
Keywords Bariu m Carbonate, P-Amino Benzo ic Acid, N-(2hydro xyethyl) Ethylenediamine-N, N’, N’’- Triacetic Acid and Bio mineralizat ion Highly ordered co mplex structures have been studied extensively due to their unique nature and fantastic properties different fro m those of the mono morph structures[1]
The crystal structures and the phase purity of the materials were determined by X-ray diffract ion (XRD)
It may be seen that the peak at (111) is the strongest, suggesting that BaCO3 crystals obtained with PABA and HEEDTA aqueous solutions were well oriented and grew main ly along the crystallographic C-axis
Summary
Ordered co mplex structures have been studied extensively due to their unique nature and fantastic properties different fro m those of the mono morph structures[1]. Biomimet ic synthesis of inorganic materials with complex and heirarch ial structures, templates or organic additives with comp lex functionalizat ion patterns are used to control the nucleation growth and alignment of inorganic cry s tals. The use of inorganic-organic interface for the mo rphosynthesis of inorganic materials is an emerg ing soft chemical route[2]. The mo lecular interactions between inorganic - organic interface seem to control nucleation and growth which often stabilizing new mod ificat ions and morpho log ies[3]. BaCO3 is having close resemblance with the aragonite type mineral with many industrial applications in the ceramic and glass industries as well as its use as a precursor fo r mag net ic ferrit es and /o r ferro elect ric materials [5]
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