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. 2019 Feb 20;9(10):5834-5843.
doi: 10.1039/c8ra09602c. eCollection 2019 Feb 11.

Mussel-inspired nano-silver loaded layered double hydroxides embedded into a biodegradable polymer matrix for enhanced mechanical and gas barrier properties

Long Mao  1   2 , Jing-Yi Liu  1 , Si-Jie Zheng  1 , Hui-Qing Wu  3 , Yue-Jun Liu  1   2 , Zhi-Han Li  2 , Yong-Kang Bai  4
Affiliations

Mussel-inspired nano-silver loaded layered double hydroxides embedded into a biodegradable polymer matrix for enhanced mechanical and gas barrier properties

Long Mao et al. RSC Adv. .

Abstract

In this paper, a facile, green and mussel-inspired method is presented to prepare silver loaded layered double hydroxides (Ag-LDHs@PDA and Ag-LDHs@TA-Fe(iii)) using a pre-synthesis polydopamine (PDA)/tannic acid (TA)-Fe(iii) layer as a nanoscale guide and PDA/TA itself as a reducing reagent to form uniform silver nanoparticles (AgNPs) on the surface of modified LDHs. Meanwhile, another kind of LDH, Ag-LDHs(PVP), was prepared via the direct reduction of the precursor [Ag(NH3)2]+ with polyvinyl pyrrolidone (PVP). And three kinds of Ag-LDHs/poly(ε-caprolactone) (PCL) nanocomposite were prepared by blending Ag-LDHs and pure PCL via a solution casting method to obtain homogeneous films. It is shown that the obtained AgNPs are distributed on the LDH surfaces uniformly. And the high loading and medium size of the AgNPs present in Ag-LDHs(PVP) give it the best antibacterial properties. However, compared with Ag-LDHs(PVP), the better dispersibilities of Ag-LDHs@PDA and Ag-LDHs@TA-Fe(iii) contribute to the greater aspect ratios of Ag-LDHs in the matrices, resulting in an increase in the number of tortuous paths for gas diffusion. Meanwhile, Ag-LDHs@PDA and Ag-LDHs@TA-Fe(iii) have stronger interactions with the PCL matrix, which is favorable for the existence of less interface defects in the matrix, resulting in an improvement in the mechanical and gas barrier properties. Therefore, mussel-inspired antibacterial Ag-LDHs/PCL nanocomposites show preferable mechanical and gas barrier properties.

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Conflict of interest statement

The authors declare no competing financial interests.

Figures

Scheme 1
Scheme 1. A schematic illustration of the preparation of Ag-LDHs.
Fig. 1
Fig. 1. TEM images of (a) Ag-LDHs(PVP), (b) Ag-LDHs@PDA and (c) Ag-LDHs@TA–Fe(iii).
Fig. 2
Fig. 2. EDS surface scans for (a) Ag-LDHs(PVP), (b) Ag-LDHs@PDA and (c) Ag-LDHs@TA–Fe(iii). HRTEM images of (d) Ag-LDHs(PVP), (e) Ag-LDHs@PDA and (f) Ag-LDHs@TA–Fe(iii).
Fig. 3
Fig. 3. (a) XRD patterns and (b) UV-vis spectra of LDHs and Ag-LDHs.
Fig. 4
Fig. 4. Photographs of (a) LDHs, (b) Ag-LDHs(PVP), (c) Ag-LDHs@PDA and (d) Ag-LDHs@TA–Fe(iii) dispersions after standing for 120 min.
Fig. 5
Fig. 5. The MIC values of Ag-LDHs.
Fig. 6
Fig. 6. The inhibition zone sizes against E. coli on different membranes: the (a) Ag-LDHs(PVP)/PCL nanocomposite; (b) Ag-LDHs@PDA/PCL nanocomposite; and (c) Ag-LDHs@TA–Fe(iii)/PCL nanocomposite.
Fig. 7
Fig. 7. DSC (a) cooling and (b) secondary heating curves of Ag-LDHs/PCL nanocomposites.
Fig. 8
Fig. 8. (a) XRD patterns and (b) TGA curves of Ag-LDHs/PCL nanocomposites.
Fig. 9
Fig. 9. The (a) tensile strength and (b) elongation at break curves for Ag-LDHs/PCL nanocomposites.
Fig. 10
Fig. 10. SEM images of the fractured surfaces of Ag-LDHs/PCL nanocomposites at different magnifications (the Ag-LDHs content is 0.5 wt%): (a and d) Ag-LDHs(PVP)/PCL nanocomposite; (b and e) Ag-LDHs@PDA/PCL nanocomposite; and (c and f) Ag-LDHs@TA–Fe(iii)/PCL nanocomposite.
Fig. 11
Fig. 11. The O2 permeability of the Ag-LDHs/PCL nanocomposites.
See this image and copyright information in PMC

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