Special Issue "Green and Eco-Friendly Nanotechnology"

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Advanced Nanomaterials and Nanotechnology".

Deadline for manuscript submissions: 30 September 2020.

Special Issue Editors

Prof. Dr. Andrea P. Reverberi
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Guest Editor
DCCI—Department of Chemistry and Industrial Chemistry, Faculty of Sciences, University of Genova, Via Dodecaneso 31, 16146 Genova, Italy
Interests: nanotechnology and nanoparticles chemical synthesis (bottom-up processes, top-down processes), solids disaggregation and etching (chemical etching, templated etching, and mask etching), lithography (stencil lithography, nanolithography), nano-manufacturing (patterning, nanomachining), modelling of heat and mass transfer in condensed matter
Special Issues and Collections in MDPI journals
Dr. Marco Salerno
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Guest Editor
MCF—Materials Characterization Facility, Italian Institute of Technology, Via Morego 30, 16163 Genova, Italy
Interests: scanning probe microscopy, nanocomposites, nanoporous oxides of valve metals, applications of anodic porous alumina, SERS, biocompatibility of materials, nanoindentation, dental restorative materials and implants
Special Issues and Collections in MDPI journals

Special Issue Information

Dear Colleagues,

The huge development of nanotechnologies has opened new issues concerning the effects of nanostructured elements or compounds on organisms and the environment. This scenario is complicated by the limited amount of detailed literature data on toxicology, bio-accumulation, and the mutagenic effects of the aforementioned materials on living species. Additionally, the synthesis of nanomaterials by chemical processes requires the use of noxious reactants that, in turn, impose compliance with stringent criteria of safety control and health safeguarding. For these reasons, the recent synthesis techniques aim to find new chemico-physical process schemes relying upon simpler, ecological, and energy-saving unit operations based on green compounds.

This Special Issue has the goal of collecting new results related to sustainable, eco-friendly, and safer products capable of minimizing the environmental impact of the global manufacturing chain regarding nanomaterials. This deals with both innovative nanomaterials, for which the fabrication techniques are more eco-friendly than for those investigated so far, as well as with innovative technological approaches to already established nanomaterials. All researchers interested in this broad area are warmly invited to present full papers, communications, and reviews.

The relevant topics include but are not limited to those listed under the Keywords listed below.

Prof. Dr. Andrea P. Reverberi
Dr. Marco Salerno
Guest Editors

Manuscript Submission Information

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Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Materials is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2000 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Green nanotechnology
  • Green nanosynthesis
  • Bionanotechnology
  • Phyto nanotechnology
  • Eco-friendly processes
  • Cleaner production
  • Sustainability
  • Self-assembly and self-organization
  • Natural lithography
  • Biodegradable or aqueous-solvent-based resistance
  • Material consumption reduction
  • Bioplastics
  • Inherent safety
  • Occupation hazard

Published Papers (6 papers)

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Research

Open AccessArticle
Effective Elimination of Contaminant Antibiotics Using High-Surface-Area Magnetic-Functionalized Graphene Nanocomposites Developed from Plastic Waste
Materials 2020, 13(7), 1517; https://doi.org/10.3390/ma13071517 - 26 Mar 2020
Cited by 1
Abstract
The presence of pharmaceutical residues in aquatic environments represents a risk for the equilibrium of the ecosystem and may seriously affect human safety itself in the long term. To address this issue, we have synthesized functional materials based on highly-reduced graphene oxide (HRGO), [...] Read more.
The presence of pharmaceutical residues in aquatic environments represents a risk for the equilibrium of the ecosystem and may seriously affect human safety itself in the long term. To address this issue, we have synthesized functional materials based on highly-reduced graphene oxide (HRGO), sulfonated graphene (SG), and magnetic sulfonated graphene (MSG). The method of synthesis adopted is simple and inexpensive and makes use of plastic bottle waste as the raw material. We have tested the fabricated materials for their adsorption efficiency against two model antibiotics in aqueous solutions, namely Garamycin and Ampicillin. Our tests involved the optimization of different experimental parameters of the adsorption process, such as starting antibiotic concentration, amount of adsorbent, and time. Finally, we characterized the effect of the antibiotic adsorption process on common living organisms, namely Escherichia coli DH5α (E. coli DH5α) bacteria. The results obtained demonstrate the efficiency of the method in addressing the issue of the emergence of antibiotic-resistant bacteria, which will help in preventing changes in the ecosystem. Full article
(This article belongs to the Special Issue Green and Eco-Friendly Nanotechnology)
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Open AccessArticle
Synthesis of Silver Nanoparticles Using Aqueous Leaf Extract of Mimosa albida (Mimosoideae): Characterization and Antioxidant Activity
Materials 2020, 13(3), 503; https://doi.org/10.3390/ma13030503 - 21 Jan 2020
Abstract
The search for sensitive and rapid analytical techniques for the determination of natural antioxidants is an area in constant growth due, among other aspects, to the complexity of plant matrices. In this study, silver nanoparticles prepared with the aqueous extract of Mimosa albida [...] Read more.
The search for sensitive and rapid analytical techniques for the determination of natural antioxidants is an area in constant growth due, among other aspects, to the complexity of plant matrices. In this study, silver nanoparticles prepared with the aqueous extract of Mimosa albida leaves were used to assess their polyphenolic content and antioxidant capacity. Silver nanoparticles were characterized by different techniques. As a result, nanoparticles of 6.5 ± 3.1 nm were obtained. The total phenolic content in the extract was 1320.4 ± 17.6 mg of gallic acid equivalents GAE· 100 g−1 and in the nanoparticles 257.3 ± 5.1 mg GAE· 100 g−1. From the phenolic profile analyzed by ultra high-performance liquid chromatography (UPLC) with a diode-array detector (DAD), the presence of apigenin and luteolin in the plant extract is postulated. The antioxidant capacity measured by oxygen radical absorbance capacity ORAC-fluorescein assay was 86917 ± 6287 and 7563 ± 967 µmol ET g−1 in the extract and nanoparticles respectively. Electrochemical analysis by cyclic voltammetry (CV) confirmed the effective reduction capacity of the Mimosa albida leaves extract to reduce Ag ions to AgNPs and differential pulse voltammetry (DPV) suggested the presence of two main reducing agents in the extract. From this study, it was concluded that the aqueous extract of Mimosa albida contains reducing agents capable of synthesizing silver nanoparticles, which can be used in the phytochemical industry. Full article
(This article belongs to the Special Issue Green and Eco-Friendly Nanotechnology)
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Open AccessArticle
Green Synthesis of Silver Nanoparticles by Low-Energy Wet Bead Milling of Metal Spheres
Materials 2020, 13(1), 63; https://doi.org/10.3390/ma13010063 - 21 Dec 2019
Abstract
A low-energy, magnetically-driven milling technique for the synthesis of silver nanoparticles is proposed, where the grinding medium and the metal precursor consisting of silver spheres have the same shape and size, belonging to a millimetric scale. The process is carried out at room [...] Read more.
A low-energy, magnetically-driven milling technique for the synthesis of silver nanoparticles is proposed, where the grinding medium and the metal precursor consisting of silver spheres have the same shape and size, belonging to a millimetric scale. The process is carried out at room temperature in aqueous solvent, where different types of capping agents have been dissolved to damp particle agglomeration. The particle diameters, determined by dynamic light scattering and transmission electron microscopy, have been compared with those typical of conventional wet-chemical bottom-up synthesis processes. The use of milling spheres and metal precursor of the same initial shape and size allows to overcome some drawbacks and limitations distinctive of conventional bead-milling equipment, generally requiring complex operations of separation and recovery of milling media. The milling bead/nanoparticle diameter ratio obtained by this approach is higher than that typical of most previous wet bead milling techniques. The method described here represents a simple, one-pot, cost-effective, and eco-friendly process for the synthesis of metal nanoparticles starting from a bulky solid. Full article
(This article belongs to the Special Issue Green and Eco-Friendly Nanotechnology)
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Open AccessArticle
Enhanced Silver Nanoparticle Synthesis by Escherichia Coli Transformed with Candida Albicans Metallothionein Gene
Materials 2019, 12(24), 4180; https://doi.org/10.3390/ma12244180 - 12 Dec 2019
Cited by 1
Abstract
In this study, the metallothionein gene of Candida albicans (C. albicans) was assembled by polymerase chain reaction (PCR), inserted into pUC19 vector, and further transformed into Escherichia coli (E. coli) DH5α cells. The capacity of these recombinant E. coli DH5α [...] Read more.
In this study, the metallothionein gene of Candida albicans (C. albicans) was assembled by polymerase chain reaction (PCR), inserted into pUC19 vector, and further transformed into Escherichia coli (E. coli) DH5α cells. The capacity of these recombinant E. coli DH5α cells to synthesize silver nanoparticles was examined. Our results demonstrated that the expression of C. albicans metallothionein in E. coli promoted the bacterial tolerance to metal ions and increased yield of silver nanoparticle synthesis. The compositional and morphological analysis of the silver nanoparticles revealed that silver nanoparticles synthesized by the engineered E. coli cells are around 20 nm in size, and spherical in shape. Importantly, the silver nanoparticles produced by the engineered cells were more homogeneous in shape and size than those produced by bacteria lack of the C. albicans metallothionein. Our study provided preliminary information for further development of the engineered E. coli as a platform for large-scale production of uniform nanoparticles for various applications in nanotechnology. Full article
(This article belongs to the Special Issue Green and Eco-Friendly Nanotechnology)
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Open AccessArticle
High Performance Bacteria Anchored by Nanoclay to Boost Straw Degradation
Materials 2019, 12(7), 1148; https://doi.org/10.3390/ma12071148 - 09 Apr 2019
Abstract
Generally, crop straw degrades slowly in soil, which is unfavorable for tillage and next crop growth. Thus, it is important to develop a promising technology to boost degradation of straw. Herein, a nanobiosystem has been developed by loading bacterial mixture in nanostructured attapulgite [...] Read more.
Generally, crop straw degrades slowly in soil, which is unfavorable for tillage and next crop growth. Thus, it is important to develop a promising technology to boost degradation of straw. Herein, a nanobiosystem has been developed by loading bacterial mixture in nanostructured attapulgite (ATP) and using it as a straw returning agent (SRA). Therein, ATP could effectively anchor bacteria to the surface of straw and greatly facilitate the adhesion and growth of bacteria. Consequently, this technology could effectively accelerate the degradation and transformation of straw into nutrients, including nitrogen (N), phosphorus (P), potassium (K), and organic matters (OM). Pot and field tests indicated that SRA displayed significant positive effects on the growth of the next crop. Importantly, SRA could effectively decrease greenhouse gas emissions from farmland, which is beneficial for the environment. Therefore, this work provides a facile and promising method to facilitate the degradation of straw, which might have a potential application value. Full article
(This article belongs to the Special Issue Green and Eco-Friendly Nanotechnology)
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Open AccessArticle
Light-Emitting Porphyrin Derivative Obtained from a Subproduct of the Cashew Nut Shell Liquid: A Promising Material for OLED Applications
Materials 2019, 12(7), 1063; https://doi.org/10.3390/ma12071063 - 01 Apr 2019
Cited by 3
Abstract
In this work, the meso-tetra[4-(2-(3-n-pentadecylphenoxy)ethoxy]phenylporphyrin (H2P), obtained from the cashew nut shell liquid (CNSL), and its zinc (ZnP) and copper (CuP) metallic complexes, were applied as emitting layers in organic light emitting diodes (OLEDs). These compounds were characterized via optical [...] Read more.
In this work, the meso-tetra[4-(2-(3-n-pentadecylphenoxy)ethoxy]phenylporphyrin (H2P), obtained from the cashew nut shell liquid (CNSL), and its zinc (ZnP) and copper (CuP) metallic complexes, were applied as emitting layers in organic light emitting diodes (OLEDs). These compounds were characterized via optical and electrochemical analysis and the electroluminescent properties of the device have been studied. We performed a cyclic voltammetry analysis to determine the Highest Occupied Molecular Orbital (HOMO) and Lowest Unoccupied Molecular Orbital (LUMO) energy levels for the porphyrins, in order to select the proper materials to assemble the device. H2P and ZnP presented fluorescence emission band in the red region, from 601 nm to 718 nm. Moreover, we verified that the introduction of bulky substituents hinders the π–π stacking, favoring the emission in the film. In addition, the strongest emitter, ZnP, presented a threshold voltage of 4 V and the maximum irradiance of 10 μW cm−2 with a current density (J) of 15 mA cm−2 at 10 V. The CuP complex showed to be a favorable material for the design of OLEDs in the infrared. These results suggest that the porphyrins derived from a renewable source, such as CNSL, is a promising material to be used in organic optoelectronic devices such as OLEDs. Full article
(This article belongs to the Special Issue Green and Eco-Friendly Nanotechnology)
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