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7946290 
Journal Article 
The effect of the initial reactant molar ratio and doping with Fe3+ on the formation of calcium Bilirubinate in water-oil microemulsions 
Liu, S; Zhu, J; Shen, Y; Xie, A; Zhang, C; Qiu, L 
2007 
1 
Russian Journal of Physical Chemistry A, Focus on Chemistry
ISSN: 0036-0244
EISSN: 1531-863X 
81 
7 
1141-1146 
English 
WOS:000253706100023 
A series of calcium bilirubinate nanoparticles were synthesized in microemulsions consisting of polyoxyethylene octylphenol ether (Triton X-100), n-hexyl alcohol (n-C6H13OH), cyclohexane (c-C 6H12), and an aqueous solution. The particles were characterized by Fourier transform infrared (FT-IR) spectra, powder X-ray diffraction (XRD), inductively coupled plasma atomic emission spectrometry (ICP-AES), transmission electron microscopy (TEM), and zeta potential measurements. The results showed that the initial CaCl2/Na 2BR molar ratio and the molar ratio of water to surfactant (ω0) influenced the morphology and microstructure of calcium bilirubinate nanoparticles and the sites of Ca2+ coordination to BR2-. The composition of synthesized calcium bilirubinate was nonstoichiometric. The stability of calcium bilirubinate nanoparticles dispersed in water changes as the Ca2+/BR2- molar ratio and solution pH varied. Dopant Fe2+ ions played a certain role in the simulated mineralization of calcium bilirubinate. A possible mechanism of calcium bilirubinate formation in inverse microemulsions is discussed. 2007 Pleiades Publishing, Ltd.