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Polydopamine/silver hybrid coatings on soda-lime glass spheres with controllable release ability for inhibiting biofilm formation

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  • ReceivedNov 15, 2019
  • AcceptedJan 13, 2020
  • PublishedMar 4, 2020

Abstract


Funded by

the Longshan Academic Talent Research Supporting Program of SWUST(18LZX447)

and the Biofilm Research & Innovation Consortium from the College of Science and Engineering

Flinders University.


Acknowledgment

Zhang H and Tang Y are grateful to the Longshan Academic Talent Research Supporting Program of SWUST (18LZX447) and the biofilm research & innovation consortium from the College of Science and Engineering, Flinders University for supporting this research, respectively.


Interest statement

The authors declare that they have no conflict of interest.


Contributions statement

Zhang HW and Tang Y designed the research. Shi Q fabricated the materials, did the characterizations, analyzed the results and drafted the manuscript with support from Zhang HP, Zhao P and Zhang Y. Zhang HP and Tang Y revised the manuscript. All authors contributed to the general discussion.


Author information

Quanbin Shi received his master’s degree from Southwest University of Science and Technology in 2013. During this period, he mainly studied the degradation characteristics of degradable mulch under natural composting conditions. He entered the School of Environmental Science and Engineering, Tianjin University for PhD study in 2013. During his PhD, his main research direction is the preparation of surface modified glass spheres and the study of their adsorption properties.


Hongwei Zhang is the Director of the Institute of Sustainable Development of Resources, Environment, Ecology and Society of Tianjin University. He graduated from Tianjin University with a major in water supply and drainage in 1982 and obtained a doctorate degree in engineering in 2002 in Tianjin University. For many years, he has been engaged in scientific research and teaching in the application of membrane technology in water treatment processes, mathematical simulation and optimal operation of urban water supply systems.


Youhong Tang obtained his PhD degree in the Hong Kong University of Science and Technology in 2007. He moved to Flinders University with an ARC-DECRA in 2012 from the Centre for Advanced Materials Technology, the University of Sydney. Prof. Tang is a material science and engineering researcher with research interests mainly focused on the structure-process-property relations of polymeric materials and nanocomposites, especially on multifunctional and value-added nanocomposites and bioresources, biomaterials and biosensors, especially incorporating novel aggregation-induced emission materials.


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  • Figure 1

    (a) Surface modification processes of glass sphere (GS) and (b) anti-biofilm and controlled release properties of PDA-Ag-HF/GS.

  • Figure 2

    The microstructure of GSs. (a–d) are SEM images of GS, HF/GS, Ag-HF/GS and PDA-Ag-HF/GS, respectively. (e) and (f) are Ag element mapping of Ag-HF/GS and PDA-Ag-HF/GS, and (g) is N element mapping of PDA-Ag-HF/GS.

  • Figure 3

    Chemical compositions of the GS surface. (a) XRD spectra of GSs. (b) XPS of GSs. High-resolution O 1s spectra of (c) GSs and (d) HF/GSs. (e) High-resolution Ag 3d spectra of Ag-HF/GSs. (f–h) are the high-resolution C 1s, N 1s, and O 1s spectra of PDA-Ag-HF/GSs, respectively.

  • Figure 4

    (a) Photo images and (b) water contact angle for 5 μL droplet on the surfaces of GS, HF/GS, Ag-HF/GS and PDA-Ag-HF/GS, respectively.

  • Figure 5

    Cumulative release of Ag+.

  • Figure 6

    Adhesion of Chlorella on the surfaces of (a) GS, (b) HF/GS, (c) Ag-HF/GS, and (d) PDA-Ag-HF/GS.

  • Figure 7

    Adhesion of bacteria on the surface of GSs. SEM images of E. coli adhesion on the surfaces of (a) GSs, (b) HF/GSs, (c) Ag-HF/GSs and (d) PDA-Ag-HF/GSs. SEM images of Bacillus adhesion on the surfaces of (e) GSs, (f) HF/GSs, (g) Ag-HF/GSs and (h) PDA-Ag-HF/GSs. (i) and (j) are photographs of different GSs co-cultured with E. coli and Bacillus. (k) and (l) are the antibacterial ratios of different GSs against E. coli and Bacillus.

  • Table 1   Curve fitting results for the O 1s spectra of GSs and HF/GSs

    Function group

    Binding energy (eV)

    GS (%)

    HF/GS (%)

    –OH

    530.85

    8.4

    15.5

    O–Si

    532.48

    91.6

    84.5

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