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Preparation of ultrathin membranes by layer-by-layer (LBL) deposition of oppositely charged inorganic colloids

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Abstract

Nanofilms were prepared by alternating deposition of Mg–Al (2:1) NO −3 layered double hydroxide (LDH), hectorite and silica particles present study. The charge density of the oppositely charged materials strongly affect film properties like thickness and ordering. The specific charge of the colloidal particles was measured with the particle charge detector. The sequential build up of the thin films was followed by spectrophotometry and X-ray diffraction (XRD). The surface morphology of the formed multilayers was characterized and film thickness determination was performed by atomic force microscopy. The influence of the charge density of hectorite and silica particles on the LDH/hectorite, LDH/silica film thickness was studied. The results reveal that the LDH concentration has a significant effect on the film thickness while the hectorite and silica concentration were not important. Films prepared from the different types of negatively charged inorganic particles in the same concentration range (0.25–1.0%) have similar thickness because of the much higher surface charge relative to the LDH lamellae.

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Acknowledgements

The authors wish their thanks Prof. Dr. Gerhard Lagaly for the valuable discussions and for the finantial support of the Hungarian Scientific Fund (OTKA) T 043430, M 045609 and for the Ministry of Education NKFP 03/047/2001.

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Authors and Affiliations

  1. Department of Colloid Chemistry, Nanostructured Materials Research Group of the Hungarian Academy of Sciences, University of Szeged, Aradi Vértanúk tere 1, 6720, Szeged, Hungary

    Viktória Hornok & Imre Dékány

  2. Department of Solid State and Radiochemistry, University of Szeged, Aradi Vértanúk tere 1, 6720, Szeged, Hungary

    András Erdőhelyi

Authors
  1. Viktória Hornok
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  2. András Erdőhelyi
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  3. Imre Dékány
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Corresponding author

Correspondence to Imre Dékány.

Appendix

Appendix

The spectra of applied materials were recorded to support that only the LDH determines the light absorbance of the films. The absorbance of hectorite dispersion and silica sol is negligible according to Fig. 10.

Fig. 10
figure 10

Absorbance versus wavelength spectra of LDH, silica and hectorite dispersions

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In order to determine film thickness a calibration curve of absorbance of LDH-dispersion with different concentrations (1–3%) was recorded. The measurements were performed at λ=400 nm (Fig. 11). A calibration curve of this kind is acceptable in case of dispersions. In view of absorbance of films the amount of LDH on the glass surface can be determined on the basis of the calibration curve. This calculated value is called specific deposited amount and is in mg/m2 dimension. The film thickness was calculated from the deposited amount divided by the density of the film.

Fig. 11
figure 11

Absorbance as function of LDH concentration in aqueous suspension

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Hornok, V., Erdőhelyi, A. & Dékány, I. Preparation of ultrathin membranes by layer-by-layer (LBL) deposition of oppositely charged inorganic colloids. Colloid Polym Sci 284, 611–619 (2006). https://doi.org/10.1007/s00396-005-1405-3

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  • DOI: https://doi.org/10.1007/s00396-005-1405-3

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