Veneto Nanotech

Venezia, Italy

Veneto Nanotech

Venezia, Italy
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Scatto M.,Veneto Nanotech | Sisani M.,Prolabin and Tefarm S.r.l.
AIP Conference Proceedings | Year: 2016

Polymer nanocomposites are a new class of innovative materials in which well-dispersed fillers, having at least one dimension in the nanometric range, are incorporated into organic polymer matrix. Because of their nanometer-size dispersion, polymer nanocomposites exhibit improved mechanical, thermal and chemical properties in comparison with the pristine polymer or conventional composites. Layered inorganic nanostructures, which are fillers very used in polymer nanocomposite researches, can be intercalated or exfoliated into polymer matrix. Because of the larger surface area and high aspect ratio of the nanoclay layers, the exfoliated structures generally provide the best performances. In this study new Layered Double Hydroxide (LDH) nanocomposites able to provide an antimicrobial activity and barrier effect for food packaging application will be developed and their safety profile will be evaluated according to current EU regulation and EFSA recommendation. © 2016 Author(s).

Stone V.,Heriot - Watt University | Pozzi-Mucelli S.,Veneto Nanotech | Tran L.,Institute of Occupational Medicine | Aschberger K.,European Commission - Joint Research Center Ispra | And 19 more authors.
Particle and Fibre Toxicology | Year: 2014

Background: To assess the risk of all nanomaterials (NMs) on a case-by-case basis is challenging in terms of financial, ethical and time resources. Instead a more intelligent approach to knowledge gain and risk assessment is required.Methods: A framework of future research priorities was developed from the accorded opinion of experts covering all major stake holder groups (government, industry, academia, funders and NGOs). It recognises and stresses the major topics of physicochemical characterisation, exposure identification, hazard identification and modelling approaches as key components of the current and future risk assessment of NMs.Results: The framework for future research has been developed from the opinions of over 80 stakeholders, that describes the research priorities for effective development of an intelligent testing strategy (ITS) to allow risk evaluation of NMs. In this context, an ITS is a process that allows the risks of NMs to be assessed accurately, effectively and efficiently, thereby reducing the need to test NMs on a case-by-case basis.For each of the major topics of physicochemical characterisation, exposure identification, hazard identification and modelling, key-priority research areas are described via a series of stepping stones, or hexagon diagrams structured into a time perspective. Importantly, this framework is flexible, allowing individual stakeholders to identify where their own activities and expertise are positioned within the prioritisation pathway and furthermore to identify how they can effectively contribute and structure their work accordingly. In other words, the prioritisation hexagon diagrams provide a tool that individual stakeholders can adapt to meet their own particular needs and to deliver an ITS for NMs risk assessment. Such an approach would, over time, reduce the need for testing by increasing the reliability and sophistication of in silico approaches.The manuscript includes an appraisal of how this framework relates to the current risk assessment approaches and how future risk assessment could adapt to accommodate these new approaches. A full report is available in electronic format (pdf) at ITS-NANO has delivered a detailed, stakeholder driven and flexible research prioritisation (or strategy) tool, which identifies specific research needs, suggests connections between areas, and frames this in a time-perspective. © 2014 Stone et al.; licensee BioMed Central Ltd.

Scott-Fordsmand J.J.,University of Aarhus | Pozzi-Mucelli S.,Veneto Nanotech | Tran L.,Institute of Occupational Medicine | Aschberger K.,European Commission | And 18 more authors.
Nano Today | Year: 2014

Summary There is an urgent need for sufficient knowledge to allow reliable assessment of the risks associated with nanomaterials. The formulation of an intelligent testing strategy (ITS) that allows safety assessment across materials is required to overcome the current need of testing each nanomaterial on a case-by-case basis. By taking into consideration the research landscape, the available tools and the stakeholders involved, the ITS-NANO consortium developed a stepping-stone based research framework which can, when implemented, deliver the information required for flexible and broadly acceptable ITS and risk assessment (RA) protocols. It was identified that in order to derive this knowledge, there needs to be research emphasis on linking physicochemical identifiers to exposure and hazard identifiers, and attention should be given to a number of key cross-cutting issues have been identified which, among other things, include development of standards, dose metrics, high throughput techniques, modelling and integration into regulatory frameworks. Finally, the developed approach must be coherent and continuously updatable, supporting the unified framework required to ensure that we acquire sufficient, rigorously validated knowledge formulation of a robust reliable ITS and RA as quickly as possible. © 2014 Elsevier Ltd. All rights reserved.

Ricco R.,CSIRO | Konstas K.,CSIRO | Styles M.J.,CSIRO | Richardson J.J.,CSIRO | And 4 more authors.
Journal of Materials Chemistry A | Year: 2015

The recent combination of Metal-Organic Frameworks (MOFs) and magnetic nanoparticles has shown their potential as a composite material in practical applications including drug delivery, catalysis and pollutant sequestration. Here, we report for the first time the preparation of a robust magnetic nanocomposite material based on an aluminium MOF (MIL-53) and iron oxide nanoparticles for the uptake of lead(ii) ions. Different aminofunctionalized MIL-53 MOFs were prepared by increasing the 2-aminoterephthalic/terephthalic acid ratio. The composite materials were tested to determine the sequestration capability of heavy metals from various solvents (methanol, DMSO and water), pH (2, 7, 12) and a range of Pb(ii) concentrations (10-8000 ppm). The magnetic composite based on MIL-53 showed remarkable capacity to sequester Pb(ii) ions from water (up to 492.4 mg g-1 of composite), the highest recorded for a MOF sorbent system to date. While the MOF played a crucial role in the efficient heavy metal uptake, the magnetic nanoparticles allowed the prompt collection of the sorbent from solution. The triggered release of Pb(ii) was investigated using an alternating magnetic field. The exceptional adsorption capacity and the response to the magnetic field make this class of innovative functional material a promising candidate for environmental remediation technologies. © The Royal Society of Chemistry 2015.

Fiorani G.,University of Venice | Selva M.,University of Venice | Perosa A.,University of Venice | Benedetti A.,University of Venice | And 4 more authors.
Green Chemistry | Year: 2015

Five new luminescent ionic liquids (LILs) derived from tryptophan (Trp), phenylalanine (Phe) and the dipeptide Gly-Gly functionalized with a dansyl chromophore moiety, were synthesized by an original protocol involving both green reagents/solvents such as non-toxic dimethyl carbonate (DMC: MeOCO2Me) and 2-propanol, and reaction conditions. In particular, DMC was used for: (i) the synthesis of methyltrioctyl methylcarbonate onium salts [Q1mmn][MeOCO2] (Q = N, m = 1, n = 8; Q = P, n = m = 4, 8) by P- and N-methylation of trioctylphosphine and trioctylamine, respectively, and (ii) acid-catalyzed esterifications of Trp and Phe to produce the corresponding methyl esters (Trp-OMe and Phe-OMe). Both reactions proceeded with >90% isolated yields and a mass index (esterifications) as low as 4.5. 2-propanol was used as the solvent for N-dansylation reactions where Trp-OMe and Gly-Glyethyl ester hydrochloride (Gly-Gly-OEt) were coupled to dansyl chloride (DNS-Cl) as a luminescent precursor. A final anion metathesis step between methylcarbonate onium salts and N-dansyl amino acid derivatives gave desired LILs of general formula [Q1mmn][DNS-X] (X = Trp, Phe, and Gly-Gly) in quantitative yields and with by-products minimization. Upon excitation (λex = 340 nm) in MeCN, all LILs exhibited green luminescence with emission quantum yields in the range of 33-41% and monoexponential emission lifetimes of 12.6 ± 0.5 ns. Moreover, each compound showed a remarkable hypsochromic shift in the peak emission wavelength when dissolved in solvents of decreasing polarity (from water to MeCN, toluene and CH2Cl2, respectively). A photostability test by a 350 nm continuous excitation on thin films of LILs proved that, after 10 min, the GlyGly derivative fully retained its PL intensity, while this (intensity) decreased from 10 to 25% for other LILs. © 2015 The Royal Society of Chemistry.

Mardegan A.,Veneto Nanotech | Pifferi V.,University of Milan | Pontoglio E.,Veneto Nanotech | Falciola L.,University of Milan | And 2 more authors.
Electrochemistry Communications | Year: 2014

An innovative spray technique for the modification of pyrolysed Photoresist Carbon Electrodes with multiwalled carbon nanotubes was studied. The modified electrodes were used for the determination of trace levels of o-toluidine, a carcinogenic organic compound employed in the synthesis of azo-dyes. The best conditions in terms of solvent used and quantity of carbon nanotubes deposited are discussed. Comparison with usual deposition methods is presented. © 2014 Elsevier B.V.

Cattaruzza E.,University of Venice | Caselli V.M.,University of Venice | Mardegan M.,University of Venice | Gonella F.,University of Venice | And 4 more authors.
Ceramics International | Year: 2015

The suitability of the Ag+→Na+ ion exchange process was tested for the production of luminescent cover glasses with down-shifting properties suitable for solar cells. The photoluminescence properties were investigated as a function of the preparation parameters (i.e., Ag salt bath concentration, post-synthesis annealing temperature and duration). The performance of the samples was tested by measuring the output power of a Si solar cell covered with the treated glass slides and exposed to a solar simulator radiation; the photoluminescence quantum yield of the best performing samples was also estimated. © 2015 Elsevier Ltd and Techna Group S.r.l.

Mancin S.,University of Padua | Diani A.,University of Padua | Vezzu S.,Veneto Nanotech | Rossetto L.,University of Padua
Science and Technology for the Built Environment | Year: 2016

This article investigates the flow boiling heat transfer of the low global warming potential refrigerant R1234yf on a microparticle coated surface obtained via high-pressure cold spray, a simple and nonexpensive technique. The sample was obtained by depositing pure copper particles with average size of 20 μm obtaining a 0.1 mm thick coating on a smooth copper plate 10 mm wide and 200 mm long. The experimental measurements were carried out at constant saturation temperature of 30°C, by varying the heat flux from 50 to 100 kW m−2, the refrigerant mass flux from 30 to 200 kg m−2 s−1, and the vapor quality from 0.2 to 0.99. The coating was found to be hydrophilic, leading to hysteresis on the heat transfer behavior, which is discussed in detail. Furthermore, the experimental results are compared against similar measurements obtained during R1234yf flow boiling over a plain copper surface. Copyright © 2016 ASHRAE

Stortini A.M.,University of Venice | Moretto L.M.,University of Venice | Mardegan A.,Veneto Nanotech | Ongaro M.,University of Venice | Ugo P.,University of Venice
Sensors and Actuators, B: Chemical | Year: 2015

Ensembles of copper nanowire electrodes (CuWNEEs) are prepared via electrodeposition in track-etched polycarbonate membranes. Three different preparation methods are compared showing that the better results in terms of sensor durability and reproducibility are achieved by pre-sputtering a thin gold film on the templating membrane and attaching it to a supporting electrode by exploiting the adhesion property and ionic conductivity of a thin Nafion interlayer. SEM-EDS analyses together with double layer charging currents measurements indicate that these arrays are formed by copper nanowires with 400 nm diameter, 10 μm length distributed with a spatial density of 1 × 108 nanowires/cm2. The voltammetric reduction of nitrate at CuWNEEs is characterized by a well-resolved cathodic peak at approximately -0.680 V vs Ag/AgCl, whose current scales linearly with the nitrate concentration in the 10-400 μM range. The limit of detection (LOD) achieved by simple linear sweep voltammetry is in the 1.7-3.0 μM range, depending on the CuWNEE preparation method, such LOD values being among the lowest reported up to now in the literature. The possibility to use CuWNEEs in chloride and nitrite containing water samples is demonstrated. © 2014 Elsevier B.V. All rights reserved.

Silvestrini M.,University of Venice | Mardegan A.,Veneto Nanotech | Moretto L.M.,University of Venice | Passamonti S.,University of Trieste | And 2 more authors.
Electrochimica Acta | Year: 2014

Pyrolyzed photoresist carbon electrodes (PPCEs) are fabricated by the photopatterning of a negative tone epoxy-based photoresist, SU-8, through optimized standard UV photolithography. The electrochemical characteristics of PPCEs are investigated in dimethyl sulfoxide (DMSO), observing a wider accessible potential window and a smaller capacitance with respect to glassy carbon electrodes. PPCEs are used to study the cyclic voltammetric behavior of bilirubin (BR) in DMSO. Detailed information is obtained on the multiple steps involved both in the electrochemical oxidation and reduction of BR. Interesting points concerning the electrochemical oxidation of BR to biliverdin are clarified, identifying the formation of an intermediate whose fate depends on the time scale of the electrochemical experiment. PPCEs are also used to electrogenerate the superoxide anion O2 -• in DMSO for studying possible reactions between BR and O2 -•. The results obtained demonstrate that BR is an efficient superoxide scavenger and that a concentration 2 mM of BR is high enough to consume all the O2 -• generated by oxygen reduction at the PPCE/DMSO interface. © 2014, Elsevier Ltd. All rights reserved.

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