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Article ; Online: Electrochemical Synthesis and Analytical Characterization of Hybrid Zinc/Calcium Antimicrobial Nano‐Oxides for Cultural Heritage Applications

Dr. Margherita Izzi / Dr. Maria Chiara Sportelli / Prof. Rosaria Anna Picca / Prof. Nicola Cioffi

ChemElectroChem, Vol 10, Iss 5, Pp n/a-n/a (2023)

2023

Abstract: Abstract The present study proposes the one‐step synthesis of Zn/Ca hybrid nano‐oxides combining an electrochemical route to ZnO nanostructures (NSs) with the wet chemical production of Ca(OH)2 NSs. ZnO is a known antimicrobial and Ca(OH)2 has ... ...

Abstract	Abstract The present study proposes the one‐step synthesis of Zn/Ca hybrid nano‐oxides combining an electrochemical route to ZnO nanostructures (NSs) with the wet chemical production of Ca(OH)2 NSs. ZnO is a known antimicrobial and Ca(OH)2 has consolidating properties, both appealing for stone artwork preservation in the field of cultural heritage. Two concentrations of the electrolytic bath (NaOH 0.1 and 0.4 M) were studied resulting in distinct final nanomaterials (Zn−Ca0.1 and Zn−Ca0.4). Fourier transform infrared, X‐ray photoelectron spectroscopies, and transmission electron microscopy demonstrated that Zn−Ca0.1 consisted of lamellar calcium hydroxyzincate NSs, whereas Zn−Ca0.4 showed hexagonal Ca(OH)2 (∼500 nm) and ZnO (∼50 nm) NSs. Nanocoatings prepared with Zn−Ca0.1 exhibited a Zn2+ release increasing up to 1 μmol cm−2 in 24 h. Instead, Zn−Ca0.4‐based nanocoatings released a constant value of about 0.35 μmol/cm2. Both types of nanocoatings showed good antimicrobial activity against Bacillus subtilis after 48 h and hydrophilic behavior over 28 days.
Keywords	analytical characterization ; Ca(OH)2 ; green synthesis ; protective coatings ; ZnO ; Industrial electrochemistry ; TP250-261 ; Chemistry ; QD1-999
Subject code	540
Language	English
Publishing date	2023-03-01T00:00:00Z
Publisher	Wiley-VCH
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: A Review on Montmorillonite-Based Nanoantimicrobials

Syed Imdadul Hossain / Ekaterina A. Kukushkina / Margherita Izzi / Maria Chiara Sportelli / Rosaria Anna Picca / Nicoletta Ditaranto / Nicola Cioffi

Nanomaterials, Vol 13, Iss 848, p

State of the Art

2023 Volume 848

Abstract: One of the crucial challenges of our time is to effectively use metal and metal oxide nanoparticles (NPs) as an alternative way to combat drug-resistant infections. Metal and metal oxide NPs such as Ag, Ag 2 O, Cu, Cu 2 O, CuO, and ZnO have found their ... ...

Abstract	One of the crucial challenges of our time is to effectively use metal and metal oxide nanoparticles (NPs) as an alternative way to combat drug-resistant infections. Metal and metal oxide NPs such as Ag, Ag 2 O, Cu, Cu 2 O, CuO, and ZnO have found their way against antimicrobial resistance. However, they also suffer from several limitations ranging from toxicity issues to resistance mechanisms by complex structures of bacterial communities, so-called biofilms. In this regard, scientists are urgently looking for convenient approaches to develop heterostructure synergistic nanocomposites which could overcome toxicity issues, enhance antimicrobial activity, improve thermal and mechanical stability, and increase shelf life. These nanocomposites provide a controlled release of bioactive substances into the surrounding medium, are cost effective, reproducible, and scalable for real life applications such as food additives, nanoantimicrobial coating in food technology, food preservation, optical limiters, the bio medical field, and wastewater treatment application. Naturally abundant and non-toxic Montmorillonite (MMT) is a novel support to accommodate NPs, due to its negative surface charge and control release of NPs and ions. At the time of this review, around 250 articles have been published focusing on the incorporation of Ag-, Cu-, and ZnO-based NPs into MMT support and thus furthering their introduction into polymer matrix composites dominantly used for antimicrobial application. Therefore, it is highly relevant to report a comprehensive review of Ag-, Cu-, and ZnO-modified MMT. This review provides a comprehensive overview of MMT-based nanoantimicrobials, particularly dealing with preparation methods, materials characterization, and mechanisms of action, antimicrobial activity on different bacterial strains, real life applications, and environmental and toxicity issues.
Keywords	antimicrobial ; Ag ; Cu ; ZnO ; montmorillonite ; chitosan ; Chemistry ; QD1-999
Language	English
Publishing date	2023-02-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: On the Efficacy of ZnO Nanostructures against SARS-CoV-2

Maria Chiara Sportelli / Margherita Izzi / Daniela Loconsole / Anna Sallustio / Rosaria Anna Picca / Roberto Felici / Maria Chironna / Nicola Cioffi

International Journal of Molecular Sciences, Vol 23, Iss 3040, p

2022 Volume 3040

Abstract: In 2019, the new coronavirus disease (COVID-19), related to the severe acute respiratory syndrome coronavirus (SARS-CoV-2), started spreading around the word, giving rise to the world pandemic we are still facing. Since then, many strategies for the ... ...

Abstract	In 2019, the new coronavirus disease (COVID-19), related to the severe acute respiratory syndrome coronavirus (SARS-CoV-2), started spreading around the word, giving rise to the world pandemic we are still facing. Since then, many strategies for the prevention and control of COVID-19 have been studied and implemented. In addition to pharmacological treatments and vaccines, it is mandatory to ensure the cleaning and disinfection of the skin and inanimate surfaces, especially in those contexts where the contagion could spread quickly, such as hospitals and clinical laboratories, schools, transport, and public places in general. Here, we report the efficacy of ZnO nanoparticles (ZnONPs) against SARS-CoV-2. NPs were produced using an ecofriendly method and fully characterized; their antiviral activity was tested in vitro against SARS-CoV-2, showing a decrease in viral load between 70% and 90%, as a function of the material’s composition. Application of these nano-antimicrobials as coatings for commonly touched surfaces is envisaged.
Keywords	zinc oxide ; nano-antimicrobials ; green synthesis ; antiviral ; COVID-19 ; nucleocapsid protein ; Biology (General) ; QH301-705.5 ; Chemistry ; QD1-999
Subject code	540
Language	English
Publishing date	2022-03-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Ag-Based Synergistic Antimicrobial Composites. A Critical Review

Ekaterina A. Kukushkina / Syed Imdadul Hossain / Maria Chiara Sportelli / Nicoletta Ditaranto / Rosaria Anna Picca / Nicola Cioffi

Nanomaterials, Vol 11, Iss 7, p

2021 Volume 1687

Abstract: The emerging problem of the antibiotic resistance development and the consequences that the health, food and other sectors face stimulate researchers to find safe and effective alternative methods to fight antimicrobial resistance (AMR) and biofilm ... ...

Abstract	The emerging problem of the antibiotic resistance development and the consequences that the health, food and other sectors face stimulate researchers to find safe and effective alternative methods to fight antimicrobial resistance (AMR) and biofilm formation. One of the most promising and efficient groups of materials known for robust antimicrobial performance is noble metal nanoparticles. Notably, silver nanoparticles (AgNPs) have been already widely investigated and applied as antimicrobial agents. However, it has been proposed to create synergistic composites, because pathogens can find their way to develop resistance against metal nanophases; therefore, it could be important to strengthen and secure their antipathogen potency. These complex materials are comprised of individual components with intrinsic antimicrobial action against a wide range of pathogens. One part consists of inorganic AgNPs, and the other, of active organic molecules with pronounced germicidal effects: both phases complement each other, and the effect might just be the sum of the individual effects, or it can be reinforced by the simultaneous application. Many organic molecules have been proposed as potential candidates and successfully united with inorganic counterparts: polysaccharides, with chitosan being the most used component; phenols and organic acids; and peptides and other agents of animal and synthetic origin. In this review, we overview the available literature and critically discuss the findings, including the mechanisms of action, efficacy and application of the silver-based synergistic antimicrobial composites. Hence, we provide a structured summary of the current state of the research direction and give an opinion on perspectives on the development of hybrid Ag-based nanoantimicrobials (NAMs).
Keywords	silver nanoparticles ; hybrid materials ; nanocomposites ; antimicrobials ; synergistic ; silver conjugates ; Chemistry ; QD1-999
Language	English
Publishing date	2021-06-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Book ; Online: Can Nanotechnology and Materials Science Help the Fight against SARS-CoV-2?

Maria Chiara Sportelli / Margherita Izzi / Ekaterina A. Kukushkina / Syed Imdadul Hossain / Rosaria Anna Picca / Nicoletta Ditaranto / Nicola Cioffi

Nanomaterials ; Volume 10 ; Issue 4

2020

Abstract: Since 2004, we have been developing nanomaterials with antimicrobial properties, the so-called nanoantimicrobials. When the coronavirus disease 2019 (COVID-19) emerged, we started investigating new and challenging routes to nanoantivirals. The two fields ...

Abstract	Since 2004, we have been developing nanomaterials with antimicrobial properties, the so-called nanoantimicrobials. When the coronavirus disease 2019 (COVID-19) emerged, we started investigating new and challenging routes to nanoantivirals. The two fields have some important points of contact. We would like to share with the readership our vision of the role a (nano)materials scientist can play in the fight against the COVID-19 pandemic. As researchers specifically working on surfaces and nanomaterials, in this letter we underline the importance of nanomaterial-based technological solutions in several aspects of the fight against the virus. While great resources are understandably being dedicated to treatment and diagnosis, more efforts could be dedicated to limit the virus spread. Increasing the efficacy of personal protection equipment, developing synergistic antiviral coatings, are only two of the cases discussed. This is not the first nor the last pandemic: our nanomaterials community may offer several technological solutions to challenge the ongoing and future global health emergencies. Readers’ feedback and suggestions are warmly encouraged.
Keywords	COVID-19 ; SARS-CoV-2 ; nanoantiviral ; PPE ; copper ; silver ; nanomedicine ; contagion ; mask ; air conditioning ; covid19
Language	English
Publishing date	2020-04-21
Publisher	Multidisciplinary Digital Publishing Institute
Publishing country	ch
Document type	Book ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Can Nanotechnology and Materials Science Help the Fight against SARS-CoV-2?

Maria Chiara Sportelli / Margherita Izzi / Ekaterina A. Kukushkina / Syed Imdadul Hossain / Rosaria Anna Picca / Nicoletta Ditaranto / Nicola Cioffi

Nanomaterials, Vol 10, Iss 802, p

2020 Volume 802

Abstract	Since 2004, we have been developing nanomaterials with antimicrobial properties, the so-called nanoantimicrobials. When the coronavirus disease 2019 (COVID-19) emerged, we started investigating new and challenging routes to nanoantivirals. The two fields have some important points of contact. We would like to share with the readership our vision of the role a (nano)materials scientist can play in the fight against the COVID-19 pandemic. As researchers specifically working on surfaces and nanomaterials, in this letter we underline the importance of nanomaterial-based technological solutions in several aspects of the fight against the virus. While great resources are understandably being dedicated to treatment and diagnosis, more efforts could be dedicated to limit the virus spread. Increasing the efficacy of personal protection equipment, developing synergistic antiviral coatings, are only two of the cases discussed. This is not the first nor the last pandemic: our nanomaterials community may offer several technological solutions to challenge the ongoing and future global health emergencies. Readers’ feedback and suggestions are warmly encouraged.
Keywords	COVID-19 ; SARS-CoV-2 ; nanoantiviral ; PPE ; copper ; silver ; Chemistry ; QD1-999
Language	English
Publishing date	2020-04-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: ZnO Nanostructures with Antibacterial Properties Prepared by a Green Electrochemical-Thermal Approach

Maria Chiara Sportelli / Rosaria Anna Picca / Margherita Izzi / Gerardo Palazzo / Roberto Gristina / Massimo Innocenti / Luisa Torsi / Nicola Cioffi

Nanomaterials, Vol 10, Iss 3, p

2020 Volume 473

Abstract: Zinc oxide (ZnO) nanostructures are widely applied materials, and are also capable of antimicrobial action. They can be obtained by several methods, which include physical and chemical approaches. Considering the recent rise of green and low-cost ... ...

Abstract	Zinc oxide (ZnO) nanostructures are widely applied materials, and are also capable of antimicrobial action. They can be obtained by several methods, which include physical and chemical approaches. Considering the recent rise of green and low-cost synthetic routes for nanomaterial development, electrochemical techniques represent a valid alternative to biogenic synthesis. Following a hybrid electrochemical-thermal method modified by our group, here we report on the aqueous electrosynthesis of ZnO nanomaterials based on the use of alternative stabilizers. We tested both benzyl-hexadecyl-dimetylammonium chloride (BAC) and poly-diallyl-(dimethylammonium) chloride (PDDA). Transmission electron microscopy images showed the formation of rod-like and flower-like structures with a variable aspect-ratio. The combination of UV−Vis, FTIR and XPS spectroscopies allowed for the univocal assessment of the material composition as a function of different thermal treatments. In fact, the latter guaranteed the complete conversion of the as-prepared colloidal materials into stoichiometric ZnO species without excessive morphological modification. The antimicrobial efficacy of both materials was tested against Bacillus subtilis as a Gram-positive model microorganism.
Keywords	zinc oxide ; electrochemical synthesis ; bac ; pdda ; nanorod ; xps ; tem ; b. subtilis ; Chemistry ; QD1-999
Subject code	540
Language	English
Publishing date	2020-03-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Electrochemical Preparation of Synergistic Nanoantimicrobials

Maria Chiara Sportelli / Daniela Longano / Elisabetta Bonerba / Giuseppina Tantillo / Luisa Torsi / Luigia Sabbatini / Nicola Cioffi / Nicoletta Ditaranto

Molecules, Vol 25, Iss 1, p

2019 Volume 49

Abstract: The rapid spreading of resistance among common bacterial pathogens towards the misused antibiotics/disinfectant agents has drawn much attention worldwide to bacterial infections. In light of this, the present work aimed at the realization of core−shell ... ...

Abstract	The rapid spreading of resistance among common bacterial pathogens towards the misused antibiotics/disinfectant agents has drawn much attention worldwide to bacterial infections. In light of this, the present work aimed at the realization of core−shell nanoparticles possessing remarkable antimicrobial properties thanks to the synergistic action of the metal core and the disinfectant shell. Copper nanoparticles stabilized by benzalkonium chloride were prepared, characterized, and implemented in poly-vinyl-methyl ketone to obtain nanoantimicrobial composite coatings. Bioactivity tests are reported, proving the excellent disinfectant properties of the proposed nanomaterials, as compared to one of the well-known and strongest silver-based nanoantimicrobials. Applications are also briefly described.
Keywords	copper nanoparticle ; benzalkonium chloride ; synergistic antimicrobial ; nanomaterial ; xps ; tem ; etaas ; Organic chemistry ; QD241-441
Language	English
Publishing date	2019-12-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: New Insights in the Ion Beam Sputtering Deposition of ZnO-Fluoropolymer Nanocomposites

Maria Chiara Sportelli / Marco Valentini / Rosaria Anna Picca / Antonella Milella / Angelo Nacci / Antonio Valentini / Nicola Cioffi

Applied Sciences, Vol 8, Iss 1, p

2018 Volume 77

Abstract: Surface modification treatments able to confer antistain/antibacterial properties to natural or synthetic materials are receiving increasing attention among scientists. Ion beam co-sputtering (IBS) of zinc oxide (ZnO) and poly-tetrafluoroethylene (PTFE) ... ...

Abstract	Surface modification treatments able to confer antistain/antibacterial properties to natural or synthetic materials are receiving increasing attention among scientists. Ion beam co-sputtering (IBS) of zinc oxide (ZnO) and poly-tetrafluoroethylene (PTFE) targets allows for the preparation of novel multifunctional coatings composed of antimicrobial ZnO nanoparticles (NPs) finely dispersed in an antistain PTFE polymeric matrix. Remarkably, IBS has been proved to be successful in the controlled deposition of thin nanocoatings as an alternative to wet methods. Moreover, tuning IBS deposition parameters allows for the control of ZnONP loadings, thus modulating the antibacterial/antistain coating’s final properties. All the deposited coatings were fully characterized by X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), and transmission electron microscopy (TEM) in order to obtain information on the materials’ surface composition, with deep insight into the nanocoatings’ morphology as a function of the ZnONP loadings. An analysis of high-resolution XP spectra evidenced a high degree of polymer defluorination along with the formation of inorganic fluorides at increasing ZnO volume ratios. Hence, post-deposition treatments for fluorides removal, performed directly in the deposition chamber, were successfully developed and optimized. In this way, a complete stoichiometry for inorganic nanophases was obtained, allowing for the conversion of fluorides into ZnO.
Keywords	ZnO ; nanoantimicrobials ; ion beam sputtering ; fluoropolymer ; X-ray photoelectron spectroscopy ; atomic force microscopy ; Technology ; T ; Engineering (General). Civil engineering (General) ; TA1-2040 ; Biology (General) ; QH301-705.5 ; Physics ; QC1-999 ; Chemistry ; QD1-999
Subject code	620
Language	English
Publishing date	2018-01-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Catalytic Activity of Silicon Nanowires Decorated with Gold and Copper Nanoparticles Deposited by Pulsed Laser Ablation

Michele Casiello / Rosaria Anna Picca / Caterina Fusco / Lucia D’Accolti / Antonio Alessio Leonardi / Maria Josè Lo Faro / Alessia Irrera / Sebastiano Trusso / Pietro Cotugno / Maria Chiara Sportelli / Nicola Cioffi / Angelo Nacci

Nanomaterials, Vol 8, Iss 2, p

2018 Volume 78

Abstract: Silicon nanowires (SiNWs) decorated by pulsed laser ablation with gold or copper nanoparticles (labeled as AuNPs@SiNWs and CuNPs@SiNWs) were investigated for their catalytic properties. Results demonstrated high catalytic performances in the Caryl–N ... ...

Abstract	Silicon nanowires (SiNWs) decorated by pulsed laser ablation with gold or copper nanoparticles (labeled as AuNPs@SiNWs and CuNPs@SiNWs) were investigated for their catalytic properties. Results demonstrated high catalytic performances in the Caryl–N couplings and subsequent carbonylations for gold and copper catalysts, respectively, that have no precedents in the literature. The excellent activity, attested by the very high turn over number (TON) values, was due both to the uniform coverage along the NW length and to the absence of the chemical shell surrounding the metal nanoparticles (MeNPs). A high recyclability was also observed and can be ascribed to the strong covalent interaction at the Me–Si interface by virtue of metal “silicides” formation.
Keywords	Caryl–N coupling ; reduction of nitroarenes ; Si nanowires ; Au nanoparticles ; Cu nanoparticles ; Chemistry ; QD1-999
Language	English
Publishing date	2018-01-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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