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. 2020 Sep 8;25(18):4097.
doi: 10.3390/molecules25184097.

Stearic Acid/Layered Double Hydroxides Composite Thin Films Deposited by Combined Laser Techniques

Ruxandra Birjega  1 , Andreea Matei  1 , Valentina Marascu  1 , Angela Vlad  1 , Maria Daniela Ionita  1 , Maria Dinescu  1 , Rodica Zăvoianu  2 , Mihai Cosmin Corobea  3
Affiliations

Stearic Acid/Layered Double Hydroxides Composite Thin Films Deposited by Combined Laser Techniques

Ruxandra Birjega et al. Molecules. .

Abstract

We report on the investigation of stearic acid-layered double hydroxide (LDH) composite films, with controlled wettability capabilities, deposited by a combined pulsed laser deposition (PLD)-matrix-assisted pulsed laser evaporation (MAPLE) system. Two pulsed lasers working in IR or UV were used for experiments, allowing the use of proper deposition parameters (wavelength, laser fluence, repetition rate) for each organic and inorganic component material. We have studied the time stability and wettability properties of the films and we have seen that the morphology of the surface has a low effect on the wettability of the surfaces. The obtained composite films consist in stearic acid aggregates in LDH structure, exhibiting a shift to hydrophobicity after 36 months of storage.

Keywords: laser deposition; layered double hydroxides; stearic acid; thin films.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Experimental setup (combined matrix-assisted pulsed laser evaporation and pulsed laser deposition (MAPLE-PLD)) for thin films deposition.
Figure 2
Figure 2
XRD patterns of the primary materials used for the targets’ preparation.
Figure 3
Figure 3
XRD patterns of the as-deposited films.
Figure 4
Figure 4
SEM images and AFM topography of 5 × 5 μm2 area of as-deposited films.
Figure 5
Figure 5
The contact angles values and the photographs of the water droplets on the surface of the as-deposited films.
Figure 6
Figure 6
FT-IR spectra of as deposited films, of the stearic acid deposited via MAPLE (a) and of the composite films deposited via a combined MAPLE-PLD deposition (b) and (c). The FT-IR spectrum of the solid NIST (National Institute of Standards and Technology-US) is included. In the right column, the detailed spectra from 3000–2700 cm−1 wavenumbers are exposed, emphasizing the νaCH2 and the νaCH3 bands (d), (e) and (f), respectively.
See this image and copyright information in PMC

References

    1. Williams G.R., O’Hare D. Towards understanding, control and application of layered double hydroxide chemistry. J. Mater. Chem. 2006;16:3065–3074. doi: 10.1039/b604895a. - DOI
    1. Costantino U., Ambrogi V., Nocchetti M., Perioli L. Hydrotalcite-like compounds: Versatile layered hosts of molecular anions with biological activity. Micropor. Mesopor. Mat. 2008;107:149–160. doi: 10.1016/j.micromeso.2007.02.005. - DOI
    1. Forano C., Hibino T., Leroux F., Taviot-Guého C. Layered double hydroxides. In: Bergaya F., Theng B.K.G., Lagaly G., editors. Handbook of Clay Science. Elsevier Ltd.; Amsterdam, The Netherlands: 2006. pp. 1021–1095.
    1. Costantino U., Gallipoli A., Nocchetti M., Camino G., Bellucci F., Frache A. New nanocomposites constituted of polyethylene and organically modified ZnAl-hydrotalcites. Polym. Degrad. Stab. 2005;90:586–590. doi: 10.1016/j.polymdegradstab.2005.05.019. - DOI
    1. He F., Zhang L., Yang F., Chen L., Wu Q. New nanocomposites based on syndiotactic polystyrene and organo-modified ZnAl layered double hydroxide. J. Polym. Res. 2006;13:483–493. doi: 10.1007/s10965-006-9071-9. - DOI

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