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Evaluation in concentration of surface amino groups upon doped and dedoped Fe3O4/PANI nanocomposites through conjugation with p-hydroxybenzaldehyde

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Abstract

An in situ chemical oxidation polymerization approach in combination with dedoping treatment was employed for preparing Fe3O4/polyaniline (Fe3O4/PANI) and dedoped Fe3O4/PANI nanocomposites. The two magnetic nanocomposites were featured with relatively high-saturation magnetization, superparamagnetism, and a multicore–shell structure. Both S and Cl species can be doped into PANI shell. The doping level of Fe3O4/PANI nanocomposite was estimated to be 30.9% through X-ray photoelectron spectroscopy. After dedoping treatment, about 95% S and 40% Cl can be removed from PANI shell. More significantly, a spectroscopic method has been developed for estimating the concentration of amino groups on surface of PANI-coated nanocomposites through nucleophilic addition between amino and p-hydroxybenzaldehyde. The concentration of surface amino groups was estimated to be ca. 357.1 and 554.5 μmol g−1, corresponding to the doped and dedoped magnetic nanocomposites, respectively.

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Acknowledgements

This work was financially supported by Natural Science Foundation of China under Grant No. 51272143.

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Authors and Affiliations

  1. School of Chemistry and Pharmaceutical Engineering, Institute of Advanced Energy Materials and Chemistry, Qilu University of Technology, Jinan, 250353, People’s Republic of China

    Nana Bai, Yan Tian & Ligang Gai

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  1. Nana Bai
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  2. Yan Tian
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  3. Ligang Gai
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Correspondence to Ligang Gai.

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Bai, N., Tian, Y. & Gai, L. Evaluation in concentration of surface amino groups upon doped and dedoped Fe3O4/PANI nanocomposites through conjugation with p-hydroxybenzaldehyde. Colloid Polym Sci 295, 1527–1534 (2017). https://doi.org/10.1007/s00396-017-4134-5

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  • DOI: https://doi.org/10.1007/s00396-017-4134-5

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