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Article

Single-Step Green Synthesis of Highly Concentrated and Stable Colloidal Dispersion of Core-Shell Silver Nanoparticles and Their Antimicrobial and Ultra-High Catalytic Properties

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Department of Material and Textile Engineering, Technical University of Liberec, 46117 Liberec, Czech Republic
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Department of Mechanical Engineering, Institute of Space Technology, Islamabad 44000, Pakistan
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Institute of Advanced Materials, Bahauddin Zakariya University, Multan 60000, Pakistan
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Department of Machinery Construction, CXI, Technical University of Liberec, 46117 Liberec, Czech Republic
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Authors to whom correspondence should be addressed.
Academic Editor: Alexey Pestryakov
Nanomaterials 2021, 11(4), 1007; https://doi.org/10.3390/nano11041007
Received: 30 March 2021 / Revised: 11 April 2021 / Accepted: 12 April 2021 / Published: 14 April 2021
The versatile one-pot green synthesis of a highly concentrated and stable colloidal dispersion of silver nanoparticles (Ag NPs) was carried out using the self-assembled tannic acid without using any other hazardous chemicals. Tannic acid (Plant-based polyphenol) was used as a reducing and stabilizing agent for silver nitrate in a mild alkaline condition. The synthesized Ag NPs were characterized for their concentration, capping, size distribution, and shape. The experimental results confirmed the successful synthesis of nearly spherical and highly concentrated (2281 ppm) Ag NPs, capped with poly-tannic acid (Ag NPs-PTA). The average particle size of Ag NPs-PTA was found to be 9.90 ± 1.60 nm. The colloidal dispersion of synthesized nanoparticles was observed to be stable for more than 15 months in the ambient environment (25 °C, 65% relative humidity). The synthesized AgNPs-PTA showed an effective antimicrobial activity against Staphylococcus Aureus (ZOI 3.0 mM) and Escherichia coli (ZOI 3.5 mM). Ag NPs-PTA also exhibited enhanced catalytic properties. It reduces 4-nitrophenol into 4-aminophenol in the presence of NaBH4 with a normalized rate constant (Knor = K/m) of 615.04 mL·s−1·mg−1. For comparison, bare Ag NPs show catalytic activity with a normalized rate constant of 139.78 mL·s−1·mg−1. Furthermore, AgNPs-PTA were stable for more than 15 months under ambient conditions. The ultra-high catalytic and good antimicrobial properties can be attributed to the fine size and good aqueous stability of Ag NPs-PTA. The unique core-shell structure and ease of synthesis render the synthesized nanoparticles superior to others, with potential for large-scale applications, especially in the field of catalysis and medical. View Full-Text
Keywords: green synthesis; silver nanoparticles; colloidal stability; antimicrobial and catalytic activity green synthesis; silver nanoparticles; colloidal stability; antimicrobial and catalytic activity
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MDPI and ACS Style

Ali, A.; Sattar, M.; Hussain, F.; Tareen, M.H.K.; Militky, J.; Noman, M.T. Single-Step Green Synthesis of Highly Concentrated and Stable Colloidal Dispersion of Core-Shell Silver Nanoparticles and Their Antimicrobial and Ultra-High Catalytic Properties. Nanomaterials 2021, 11, 1007. https://doi.org/10.3390/nano11041007

AMA Style

Ali A, Sattar M, Hussain F, Tareen MHK, Militky J, Noman MT. Single-Step Green Synthesis of Highly Concentrated and Stable Colloidal Dispersion of Core-Shell Silver Nanoparticles and Their Antimicrobial and Ultra-High Catalytic Properties. Nanomaterials. 2021; 11(4):1007. https://doi.org/10.3390/nano11041007

Chicago/Turabian Style

Ali, Azam, Mariyam Sattar, Fiaz Hussain, Muhammad H.K. Tareen, Jiri Militky, and Muhammad T. Noman 2021. "Single-Step Green Synthesis of Highly Concentrated and Stable Colloidal Dispersion of Core-Shell Silver Nanoparticles and Their Antimicrobial and Ultra-High Catalytic Properties" Nanomaterials 11, no. 4: 1007. https://doi.org/10.3390/nano11041007

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