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Winkleman A, Bracher PJ, Gitlin I, et al. Fabrication and Manipulation of Ionotropic Hydrogels Crosslinked by Paramagnetic Ions. Chem Mater. 2007;19(6):1362-1368doi: 10.1021/cm062626f.
Winkleman, A., Bracher, P. J., Gitlin, I., & Whitesides, G. M. (2007). Fabrication and Manipulation of Ionotropic Hydrogels Crosslinked by Paramagnetic Ions. Chemistry of materials : a publication of the American Chemical Society, 19(6), 1362-1368. https://doi.org/10.1021/cm062626f
Winkleman, Adam, et al. "Fabrication and Manipulation of Ionotropic Hydrogels Crosslinked by Paramagnetic Ions." Chemistry of materials : a publication of the American Chemical Society vol. 19,6 (2007): 1362-1368. doi: https://doi.org/10.1021/cm062626f
Winkleman A, Bracher PJ, Gitlin I, Whitesides GM. Fabrication and Manipulation of Ionotropic Hydrogels Crosslinked by Paramagnetic Ions. Chem Mater. 2007;19(6):1362-1368. doi: 10.1021/cm062626f. PMID: 18802491; PMCID: PMC2542877.
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Chem Mater. 2007;19(6):1362-1368. doi: 10.1021/cm062626f.

Fabrication and Manipulation of Ionotropic Hydrogels Crosslinked by Paramagnetic Ions.

Chemistry of materials : a publication of the American Chemical Society

Adam Winkleman, Paul J Bracher, Irina Gitlin, George M Whitesides

Affiliations

  1. Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford St., Cambridge, MA 02138.

PMID: 18802491 PMCID: PMC2542877 DOI: 10.1021/cm062626f

Abstract

This manuscript describes the fabrication and manipulation of millimeter-scale spheres fabricated from ionotropic hydrogels that are crosslinked with paramagnetic metal ions (e.g., Ho(3+)). These ionotropic hydrogels experience a force in a magnetic field gradient that correlates with the concentration of the paramagnetic cations crosslinking the polymer. In an externally applied magnetic field, the paramagnetic hydrogel spheres assemble into ordered arrays or confined geometrical structures in the regions of highest magnetic field. These spheres can be separated from heterogeneous mixtures of diamagnetic materials using a simple bar magnet. Two applications using these recoverable hydrogel spheres were demonstrated: i) When prepared with embedded indicator dyes bound to paper, the spheres were used as colorimetric sensors for pH. ii) When prepared with embedded activated carbon powder, they were used to remove organic materials from aqueous solutions.

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