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Issue 5, 2016
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The effect of guanidinium functionalization on the structural properties and anion affinity of polyelectrolyte multilayers

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Abstract

Poly(allylamine hydrochloride) (PAH) is chemically functionalized with guanidinium (Gu) moieties in water at room temperature. The resulting PAH-Gu is used to prepare polyelectrolyte multilayers (PEMs) with poly(sodium 4-styrene sulfonate) (PSS) via layer-by-layer deposition. The polyelectrolyte (PE) adsorption processes are monitored real-time by optical reflectometry and a quartz crystal microbalance with dissipation monitoring (QCM-D). Compared to the reference PSS/PAH PEMs, the PSS/PAH-Gu PEMs show a lower amount of deposited PE materials, lower wet thickness, higher stability under alkaline conditions and higher rigidity. These differences are rationalized by the additional Gu–SO3 interactions, also affecting the conformation of the PE chains in the PEM. The interactions between the PEMs and various sodium salts (NaCl, NaNO3, Na2SO4 and NaH2PO4) are also monitored using QCM-D. From the changes in the frequency, dissipation responses and supportive Reflection Absorption Infrared Spectroscopy it is concluded that Gu-functionalized PEMs absorb more H2PO4 compared to the Gu-free reference PEMs. This can be understood by strong interactions between Gu and H2PO4, the differences in the anion hydration energy and the anion valency. It is anticipated that compounds like the presented Gu-functionalized PE may facilitate the further development of H2PO4 sensors and ion separation/recovery systems.

Graphical abstract: The effect of guanidinium functionalization on the structural properties and anion affinity of polyelectrolyte multilayers

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Publication details

The article was received on 06 Jul 2015, accepted on 24 Nov 2015 and first published on 24 Nov 2015


Article type: Paper
DOI: 10.1039/C5SM01655J
Author version available: Download Author version (PDF)
Citation: Soft Matter, 2016,12, 1496-1505
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    The effect of guanidinium functionalization on the structural properties and anion affinity of polyelectrolyte multilayers

    Z. Cao, P. I. Gordiichuk, K. Loos, E. J. R. Sudhölter and L. C. P. M. de Smet, Soft Matter, 2016, 12, 1496
    DOI: 10.1039/C5SM01655J

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