Synthesis of brushite particles in reverse microemulsions of the biosurfactant surfactin |
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Authors: | Maity Jyoti Prakash Lin Tz-Jiun Cheng Henry Pai-Heng Chen Chien-Yen Reddy A Satyanarayana Atla Shashi B Chang Young-Fo Chen Hau-Ren Chen Chien-Cheng |
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Affiliation: | Department of Earth and Environmental Sciences National Chung Cheng University, 168 University Road, Min-Hsiung, Chia-Yi 62102, Taiwan; E-Mails: jyoti_maity@yahoo.com (J.P.M.); answer75114@hotmail.com (T.-J.L.); akurireddy@gmail.com (A.S.R.); shashi_org@yahoo.com (S.B.A.); seichyo@eq.ccu.edu.tw (Y.-F.C.). |
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Abstract: | In this study the "green chemistry" use of the biosurfactant surfactin for the synthesis of calcium phosphate using the reverse microemulsion technique was demonstrated. Calcium phosphates are bioactive materials that are a major constituent of human teeth and bone tissue. A reverse microemulsion technique with surfactin was used to produce nanocrystalline brushite particles. Structural diversity (analyzed by SEM and TEM) resulted from different water to surfactin ratios (W/S; 250, 500, 1000 and 40,000). The particle sizes were found to be in the 16-200 nm range. Morphological variety was observed in the as-synthesized microemulsions, which consisted of nanospheres (~16 nm in diameter) and needle-like (8-14 nm in diameter and 80-100 nm in length) noncalcinated particles. However, the calcinated products included nanospheres (50-200 nm in diameter), oval (~300 nm in diameter) and nanorod (200-400 nm in length) particles. FTIR and XRD analysis confirmed the formation of brushite nanoparticles in the as-synthesized products, while calcium pyrophosphate was produced after calcination. These results indicate that the reverse microemulsion technique using surfactin is a green process suitable for the synthesis of nanoparticles. |
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Keywords: | biosurfactant reverse microemulsion brushite surfactin nanoparticle |
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