Abstract
This paper describes the synthesis of adenine-mediated superparamagnetic β-FeOOH nanostructures in aqueous medium. Capping by adenine provides a synthetic control to manipulate their size, morphology, optical and magnetization properties. β-FeOOH binds to adenine mainly through –NH2, N(3); N(9)H and N(7) of the pyridine and imidazole rings, respectively. At low [adenine], it produces nanorods, but at higher [adenine] (>1 × 10−2 mol dm−3), increasing numbers of spherical nanoparticles encapsulating β-FeOOH with an average diameter of 2.5 nm in the core and adenine molecules in the shell are obtained, causing an increase in the specific surface area by about twofold. Dynamic light scattering technique also depicts a regular decrease in their hydrodynamic size with increasing [adenine] and exhibits the highest stability with a zeta potential of ~67 mV for the sample containing 2 × 10−2 mol dm−3 adenine (SP5). An increasing [adenine] from 1 × 10−3 to 2 × 10−2 mol dm−3 in these samples enhanced the value of saturation magnetization (M S), due to β-FeOOH, gradually from 2.0 to 6.9 emu g−1 at 300 K, but at <80 K, a magnetic reversal from superparamagnetic to ferromagnetic is observed. A correlation between morphology and magnetic properties of these nanostructures is discussed. The capping of colloidal β-FeOOH by adenine thus provides a synthetic control to produce novel biocompatible nanostructures exhibiting superparamagnetic behavior with high M S at 300 K having potential for environmental and biological applications.
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Acknowledgments
SKG is thankful to MHRD, New Delhi for the award of SRF. Thanks is also due to the Heads, Center of Nanotechnology for Zetasizer, UV–Vis–NIR spectrophotometer and IIC, IITR, Roorkee for providing the facilities of XRD, FESEM, and SQUID magnetometer. The authors also acknowledge SAIF, AIIMS, New Delhi; Panjab University, Chandigarh; Metrohm India Ltd.; M/s Laser Spectra Sevices India Pvt. Ltd., Bangalore for providing facilities of TEM, surface area analysis, and Raman Spectroscopy, respectively. Help of Mr. Satyabadi Martha is also acknowledged for getting recorded Raman spectra.
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Kumar, A., Gupta, S.K. Synthesis of adenine mediated superparamagnetic colloidal β-FeOOH nanostructure(s): study of their morphological changes and magnetic behavior. J Nanopart Res 15, 1466 (2013). https://doi.org/10.1007/s11051-013-1466-z
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DOI: https://doi.org/10.1007/s11051-013-1466-z