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. 2018 Nov 28;8(12):986.
doi: 10.3390/nano8120986.

Effect of Polyelectrolyte Mono- and Bilayer Formation on the Colloidal Stability of Layered Double Hydroxide Nanoparticles

Zoltán Somosi  1   2 , Marko Pavlovic  3 , István Pálinkó  4 , István Szilágyi  5   6
Affiliations

Effect of Polyelectrolyte Mono- and Bilayer Formation on the Colloidal Stability of Layered Double Hydroxide Nanoparticles

Zoltán Somosi et al. Nanomaterials (Basel). .

Abstract

Sequential adsorption of polyelectrolytes on nanoparticles is a popular method to obtain thin films after deposition. However, the effect of polyelectrolyte multilayer formation on the colloidal stability of the nanoparticles has not been studied in detail. In the present work, layered double hydroxides (LDH) were synthesized and interaction with oppositely and like-charged polyelectrolytes was investigated. Electrophoretic and light scattering measurements revealed that colloidal stability of LDH can be tuned by adsorption of poly(styrene sulfonate) (PSS) on the oppositely charged LDH surface in appropriate doses and thus, unstable or stable dispersions can be designed. Negatively charged LDH of adsorbed PSS monolayer was obtained and a poly(diallyldimethyl ammonium chloride) (PDADMAC) second layer was systematically built on the particles. The obtained polyelectrolyte bilayer provided high colloidal stability for the LDH-PSS-PDADMAC dispersions due to the presence of repulsive interparticle forces of electrostatic and steric origin. The results provide crucial quantitative information on designing highly stable particle-polyelectrolyte systems for the preparation of thin films or immobilization of guest substances between the layers for delivery processes.

Keywords: colloidal stability; layered double hydroxide; polyelectrolyte layer.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Powder XRD pattern of the LDH particles composed of magnesium(II) and aluminium(III) cations and chloride interlayer anions. The inset illustrates the meaning of the d003 value calculated from the (003) reflection.
Figure 2
Figure 2
Electrophoretic mobility (circles, left axis) and stability ratio (squares, right axis) values of LDH particles in the presence of PSS polyelectrolyte. The measurements were carried out at 10 mg/L particle concentration and 10 mM NaCl was used as background electrolyte to adjust the ionic strength. The mg/g unit on the x-axis refers to mg PSS per one gram of LDH. The structure of PSS is shown in the inset.
Figure 3
Figure 3
Hydrodynamic radii of LDH particles as a function of the measurement time in the presence of 8.5 mg/g (triangles), 9.5 mg/g (circles) and 12.0 mg/g (squares) PSS. The solid lines are linear fits used to calculate the apparent rates according to Equation (3).
Figure 4
Figure 4
Electrophoretic mobilities (red circles, left axis) and stability ratios (blue squares, right axis) of LDH-PSS (100 mg PSS per one gram of LDH, which corresponds to the dose of the onset of the adsorption saturation plateau (ASP)) as a function of the poly(diallyldimethyl ammonium chloride) (PDADMAC) concentration. The measurements were performed at 10 mg/L particle concentration and 10 mM ionic strength adjusted by NaCl. The structure of PDADMAC is shown in the inset.
Figure 5
Figure 5
Electrophoretic mobility (left) and stability ratio (right) of bare LDH (triangles), LDH-PSS (squares) and LDH-PSS-PDADMAC (circles) particles versus the ionic strength adjusted by NaCl. A PSS dose of 100 mg/g and PDADMAC of 300 mg/g was applied in the composite particles. These doses correspond to the onsets of the ASP. The insets illustrate an LDH particle and its polyelectrolyte-functionalized derivatives.
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References

    1. Decher G., Schlenoff J.B. Multilayer Thin Films. Wiley-VCH; Weinheim, Germany: 2002.
    1. Ho T.T.M., Bremmell K.E., Krasowska M., MacWilliams S.V., Richard C.J.E., Stringer D.N., Beattie D.A. In Situ Atr Ftir Spectroscopic Study of the Formation and Hydration of a Fucoidan/Chitosan Polyelectrolyte Multilayer. Langmuir. 2015;31:11249–11259. doi: 10.1021/acs.langmuir.5b01812. - DOI - PubMed
    1. Kotov N.A., Haraszti T., Turi L., Zavala G., Geer R.E., Dekany I., Fendler J.H. Mechanism of and Defect Formation in the Self-Assembly of Polymeric Polycation-Montmorillonite Ultrathin Films. J. Am. Chem. Soc. 1997;119:6821–6832. doi: 10.1021/ja964409t. - DOI
    1. Zhang B., Shi S.X., Shi W.Y., Sun Z.Y., Kong X.G., Wei M., Duan X. Assembly of Ruthenium(II) Complex/Layered Double Hydroxide Ultrathin Film and Its Application as an Ultrasensitive Electrochemiluminescence Sensor. Electrochim. Acta. 2012;67:133–139. doi: 10.1016/j.electacta.2012.02.039. - DOI
    1. Caruso F., Schuler C. Enzyme Multilayers on Colloid Particles: Assembly, Stability, and Enzymatic Activity. Langmuir. 2000;16:9595–9603. doi: 10.1021/la000942h. - DOI