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Prof. Dr. Liberata Guadagno
Department of Industrial Engineering, University of Salerno, Via Giovanni Paolo II, 132, 84084 Fisciano (SA), Italy

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0 Mechanical Properties
0 Smart Materials
0 thermosetting resins
0 Supramolecular interactions
0 Study of the correlations between chemical-physical properties, structure, morphology and durability of macromolecular systems with different types of organizational architectures

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Mechanical Properties
Study of the correlations between chemical-physical properties, structure, morphology and durability of macromolecular systems with different types of organizational architectures
Smart Materials

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Journal article
Published: 25 August 2021 in Nanomaterials
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This work aimed to monitor, through the changes in electrical resistance, the evolution of the mechanical properties due to aging caused by water sorption in carbon nanotube-based epoxy composites. The epoxy/CNT nanocomposites were prepared by dispersing the filler in the precursor through the ultra-sonication process and mixing the hardener by mechanical stirring. After an evaluation of the electrical properties, detected through a two-probe electrical measurement method, of nanocomposites at different percentages by weight of the filler (0.025, 0.05, 0.1, 0.3, 0.5, and 1.0), a concentration (0.1% by weight), close to that of the electrical percolation threshold, was chosen to evaluate the resistive response. This specific concentration was selected in order to obtain maximized values of the variation detected for the changes in the electrical resistance resulting from phenomena of structural relaxations/rearrangements due to water absorption. In particular, the electrical conductivity value switched from 8.2 × 10−14 S/m for the unfilled epoxy resin to 6.3 × 10−2 S/m for carbon nanotube-based epoxy composite at 0.1% by weight of the nanofiller. The water sorption caused a reduction in the mechanical properties (storage modulus and tan δ) due to swelling and plasticization phenomena, which caused the structural reorganization of the conductive interparticle contacts in the matrix with a consequent variation in the electrical resistance of the material. The found ‘non-Fickian’ water diffusion behavior was very similar to the variation in the electrical resistance with time. This last correlation allows the association of the measurement of the electrical resistance with the quantity of absorbed water and, therefore, with the aging of the material to water absorption, through the sensitivity factor (β). The resistive nature of the composite can be used to monitor the amount of water absorption and the changes in the structure of the material subject to water aging.

ACS Style

Liberata Guadagno; Luigi Vertuccio. Resistive Response of Carbon Nanotube-Based Composites Subjected to Water Aging. Nanomaterials 2021, 11, 2183 .

AMA Style

Liberata Guadagno, Luigi Vertuccio. Resistive Response of Carbon Nanotube-Based Composites Subjected to Water Aging. Nanomaterials. 2021; 11 (9):2183.

Chicago/Turabian Style

Liberata Guadagno; Luigi Vertuccio. 2021. "Resistive Response of Carbon Nanotube-Based Composites Subjected to Water Aging." Nanomaterials 11, no. 9: 2183.

Journal article
Published: 08 August 2021 in Composites Part B: Engineering
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Lightweight electro-thermal flexible heaters are attracting great attention for the considerable applicative potentialities. Some causes, including cost, material availability, complex manufacturing process, absence of biodegradability/recyclability, or low heating efficiency are preventing their widespread application. Herein, an expanded graphite-based polymeric film similar to buckypaper prepared by a very simple green process is proposed as an intermediate layer of a flexible electro-thermal multilayer film heater. The multilayer is also designed to be used on human skin and with any type of food. For low applied voltages, from 3 V to 8 V, a temperature ranging between 26 and 100 °C can be set, reaching a heating rate of 84 °C/min for the maximum applied voltage. A simple simulation of the heating data can help to plan the heating for specific applications. The ease of the production steps together with the absence of pollutants during the preparation process makes the designed device useable on a large scale and for a large variety of applications where values of temperature equal to or below 130 °C are required.

ACS Style

Liberata Guadagno; Luigi Vertuccio; Fabiana Foglia; Marialuigia Raimondo; Giuseppina Barra; Andrea Sorrentino; Roberto Pantani; Elisa Calabrese. Flexible eco-friendly multilayer film heaters. Composites Part B: Engineering 2021, 224, 109208 .

AMA Style

Liberata Guadagno, Luigi Vertuccio, Fabiana Foglia, Marialuigia Raimondo, Giuseppina Barra, Andrea Sorrentino, Roberto Pantani, Elisa Calabrese. Flexible eco-friendly multilayer film heaters. Composites Part B: Engineering. 2021; 224 ():109208.

Chicago/Turabian Style

Liberata Guadagno; Luigi Vertuccio; Fabiana Foglia; Marialuigia Raimondo; Giuseppina Barra; Andrea Sorrentino; Roberto Pantani; Elisa Calabrese. 2021. "Flexible eco-friendly multilayer film heaters." Composites Part B: Engineering 224, no. : 109208.

Research article
Published: 14 June 2021 in International Journal of Polymer Science
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Vitrimeric materials have emerged as fascinating and sustainable materials owing to their malleability, reprocessability, and recyclability. Sustainable vitrimeric materials can be prepared by reinforcing polymeric matrix with bioderived fillers. In the current work, a sustainable vitrimer is prepared by incorporating biomass-derived activated carbon (AC) filler into the epoxy matrix to achieve enhanced thermal and mechanical properties. Thus, prepared biocomposite vitrimers demonstrate a lower-temperature self-healing (70°C for 5 min) via disulfide exchanges, compared to the pristine epoxy vitrimers (80°C for 5 min). Significantly, the self-healing performances have been studied extensively with the flexural studies; and changes in material healing efficiency have been demonstrated based on the observed changes in modulus.

ACS Style

Balaji Krishnakumar; Debajyoti Bose; Manjeet Singh; R. V. Siva Prasanna Sanka; Velidi V. S. S. Gurunadh; Shailey Singhal; Vijay Parthasarthy; Liberata Guadagno; Poornima Vijayan P; Sabu Thomas; Sravendra Rana. Sugarcane Bagasse-Derived Activated Carbon- (AC-) Epoxy Vitrimer Biocomposite: Thermomechanical and Self-Healing Performance. International Journal of Polymer Science 2021, 2021, 1 -7.

AMA Style

Balaji Krishnakumar, Debajyoti Bose, Manjeet Singh, R. V. Siva Prasanna Sanka, Velidi V. S. S. Gurunadh, Shailey Singhal, Vijay Parthasarthy, Liberata Guadagno, Poornima Vijayan P, Sabu Thomas, Sravendra Rana. Sugarcane Bagasse-Derived Activated Carbon- (AC-) Epoxy Vitrimer Biocomposite: Thermomechanical and Self-Healing Performance. International Journal of Polymer Science. 2021; 2021 ():1-7.

Chicago/Turabian Style

Balaji Krishnakumar; Debajyoti Bose; Manjeet Singh; R. V. Siva Prasanna Sanka; Velidi V. S. S. Gurunadh; Shailey Singhal; Vijay Parthasarthy; Liberata Guadagno; Poornima Vijayan P; Sabu Thomas; Sravendra Rana. 2021. "Sugarcane Bagasse-Derived Activated Carbon- (AC-) Epoxy Vitrimer Biocomposite: Thermomechanical and Self-Healing Performance." International Journal of Polymer Science 2021, no. : 1-7.

Journal article
Published: 26 April 2021 in Polymers
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A big step forward for composite application in the sector of structural materials is given by the use of Multi-Wall Carbon Nanotubes (MWCNTs) functionalized with hydrogen bonding moieties, such as barbiturate and thymine, to activate self-healing mechanisms and integrate additional functionalities. These materials with multiple healing properties at the same damaged site, imparted by hydrogen bonds, will also have the potential to improve material reliability, extend the service life, reduce replacement costs, and improve product safety. This revolutionary approach is obtained by integrating the non-covalent interactions coupled with the conventional covalent approach used to cross-link the polymer. The objective of this work is to characterize rubber-toughened supramolecular self-healing epoxy formulations based on unfunctionalized and functionalized MWCNTs using Tunneling Atomic Force Microscopy (TUNA). This advanced technique clearly shows the effect produced by the hydrogen bonding moieties acting as reversible healing elements by their simultaneous donor and acceptor character, and covalently linked to MWCNTs to originate self-healing nanocomposites. In particular, TUNA proved to be very effective for the morphology study of both the unfunctionalized and functionalized carbon nanotube-based conductive networks, thus providing useful insights aimed at understanding the influence of the intrinsic nature of the nanocharge on the final properties of the multifunctional composites.

ACS Style

Marialuigia Raimondo; Elisa Calabrese; Wolfgang Binder; Philipp Michael; Sravendra Rana; Liberata Guadagno. Tunneling Atomic Force Microscopy Analysis of Supramolecular Self-Responsive Nanocomposites. Polymers 2021, 13, 1401 .

AMA Style

Marialuigia Raimondo, Elisa Calabrese, Wolfgang Binder, Philipp Michael, Sravendra Rana, Liberata Guadagno. Tunneling Atomic Force Microscopy Analysis of Supramolecular Self-Responsive Nanocomposites. Polymers. 2021; 13 (9):1401.

Chicago/Turabian Style

Marialuigia Raimondo; Elisa Calabrese; Wolfgang Binder; Philipp Michael; Sravendra Rana; Liberata Guadagno. 2021. "Tunneling Atomic Force Microscopy Analysis of Supramolecular Self-Responsive Nanocomposites." Polymers 13, no. 9: 1401.

Editorial
Published: 14 April 2021 in Aerospace
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This Special Issue contains selected papers from works presented at the 10th EASN International Conference on Innovation in Aviation & Space to the Satisfaction of the European Citizens, which was held successfully from the 2nd until the 4th of September, 2020

ACS Style

Liberata Guadagno; Spiros Pantelakis; Andreas Strohmayer. Special Issue “10th EASN International Conference on Innovation in Aviation & Space to the Satisfaction of the European Citizens”. Aerospace 2021, 8, 111 .

AMA Style

Liberata Guadagno, Spiros Pantelakis, Andreas Strohmayer. Special Issue “10th EASN International Conference on Innovation in Aviation & Space to the Satisfaction of the European Citizens”. Aerospace. 2021; 8 (4):111.

Chicago/Turabian Style

Liberata Guadagno; Spiros Pantelakis; Andreas Strohmayer. 2021. "Special Issue “10th EASN International Conference on Innovation in Aviation & Space to the Satisfaction of the European Citizens”." Aerospace 8, no. 4: 111.

Journal article
Published: 01 April 2021 in Polymer
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Fully biodegradable self-healing nanocomposites were prepared by mixing carbon nanotubes (CNTs)-based carboxyl methyl cellulose (CMC), produced by chemical modification of cellulose, with a commercial biodegradable highly amorphous vinyl alcohol polymer (HAVOH) containing murexide salt. Damaged specimens were allowed to cure by simply touching the cutting sections in a controlled temperature and humidity environment (30 °C and 80%) for a period of 48 h. The healing efficiency of the samples, evaluated by the recovery of the “Storage Modulus” determined by dynamic-mechanical analysis (DMA) of healed samples, manifests a temperature-dependence behaviour. For temperatures above 50 °C, an almost complete recovery (100%) was observed for the sample of HAVOH containing a solubilized murexide salt. The presence of CNTs-based CMC imparts improved mechanical properties. Maximum values for healing efficiency were observed between 30 and 80 °C.

ACS Style

Liberata Guadagno; Luigi Vertuccio; Giuseppina Barra; Carlo Naddeo; Andrea Sorrentino; Marino Lavorgna; Marialuigia Raimondo; Elisa Calabrese. Eco-friendly polymer nanocomposites designed for self-healing applications. Polymer 2021, 223, 123718 .

AMA Style

Liberata Guadagno, Luigi Vertuccio, Giuseppina Barra, Carlo Naddeo, Andrea Sorrentino, Marino Lavorgna, Marialuigia Raimondo, Elisa Calabrese. Eco-friendly polymer nanocomposites designed for self-healing applications. Polymer. 2021; 223 ():123718.

Chicago/Turabian Style

Liberata Guadagno; Luigi Vertuccio; Giuseppina Barra; Carlo Naddeo; Andrea Sorrentino; Marino Lavorgna; Marialuigia Raimondo; Elisa Calabrese. 2021. "Eco-friendly polymer nanocomposites designed for self-healing applications." Polymer 223, no. : 123718.

Systematic review
Published: 26 March 2021 in Nanomaterials
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Nanoparticles (NPs) in the biomedical field are known for many decades as carriers for drugs that are used to overcome biological barriers and reduce drug doses to be administrated. Some types of NPs can interact with external stimuli, such as electromagnetic radiations, promoting interesting effects (e.g., hyperthermia) or even modifying the interactions between electromagnetic field and the biological system (e.g., electroporation). For these reasons, at present these nanomaterial applications are intensively studied, especially for drugs that manifest relevant side effects, for which it is necessary to find alternatives in order to reduce the effective dose. In this review, the main electromagnetic-induced effects are deeply analyzed, with a particular focus on the activation of hyperthermia and electroporation phenomena, showing the enhanced biological performance resulting from an engineered/tailored design of the nanoparticle characteristics. Moreover, the possibility of integrating these nanofillers in polymeric matrices (e.g., electrospun membranes) is described and discussed in light of promising applications resulting from new transdermal drug delivery systems with controllable morphology and release kinetics controlled by a suitable stimulation of the interacting systems (nanofiller and interacting cells).

ACS Style

Raffaele Longo; Giuliana Gorrasi; Liberata Guadagno. Electromagnetically Stimuli-Responsive Nanoparticles-Based Systems for Biomedical Applications: Recent Advances and Future Perspectives. Nanomaterials 2021, 11, 848 .

AMA Style

Raffaele Longo, Giuliana Gorrasi, Liberata Guadagno. Electromagnetically Stimuli-Responsive Nanoparticles-Based Systems for Biomedical Applications: Recent Advances and Future Perspectives. Nanomaterials. 2021; 11 (4):848.

Chicago/Turabian Style

Raffaele Longo; Giuliana Gorrasi; Liberata Guadagno. 2021. "Electromagnetically Stimuli-Responsive Nanoparticles-Based Systems for Biomedical Applications: Recent Advances and Future Perspectives." Nanomaterials 11, no. 4: 848.

Journal article
Published: 24 March 2021 in Nanomaterials
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Epoxy resins containing multi-wall carbon nanotubes (MWCNTs) have proven to be suitable for manufacturing promising self-sensing materials to be applied in the automotive and aeronautic sectors. Different parameters concerning morphological and mechanical properties of the hosting matrices have been analyzed to choose the most suitable system for targeted applications. Two different epoxy precursors, the tetrafunctional tetraglycidyl methylene dianiline (TGMDA) and the bifunctional bisphenol A diglycidyl ether (DGEBA) have been considered. Both precursors have been hardened using the same hardener in stoichiometric conditions. The different functionality of the precursor strongly affects the crosslinking density and, as a direct consequence, the electrical and mechanical behavior. The properties exhibited by the two different formulations can be taken into account in order to make the most appropriate choice with respect to the sensing performance. For practical applications, the choice of one formulation rather than another can be performed on the basis of costs, sensitivity, processing conditions, and most of all, mechanical requirements and in-service conditions of the final product. The performed characterization shows that the nanocomposite based on the TGMDA precursor manifests better performance in applications where high values in the glass transition temperature and storage modulus are required.

ACS Style

Liberata Guadagno; Patrizia Lamberti; Vincenzo Tucci; Luigi Vertuccio. Self-Sensing Nanocomposites for Structural Applications: Choice Criteria. Nanomaterials 2021, 11, 833 .

AMA Style

Liberata Guadagno, Patrizia Lamberti, Vincenzo Tucci, Luigi Vertuccio. Self-Sensing Nanocomposites for Structural Applications: Choice Criteria. Nanomaterials. 2021; 11 (4):833.

Chicago/Turabian Style

Liberata Guadagno; Patrizia Lamberti; Vincenzo Tucci; Luigi Vertuccio. 2021. "Self-Sensing Nanocomposites for Structural Applications: Choice Criteria." Nanomaterials 11, no. 4: 833.

Journal article
Published: 19 January 2021 in Composite Structures
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Adhesive durability and joint reliability, strictly related to the bonding agents, are key parameters still under evaluation in civil as well as in other engineering fields. Moisture, different environmental agents and temperature (in particular) can strongly affect the performance of the adhesive joints over the time limiting their applicability. The environmental temperature may exceed the glass transition temperature (Tg) of the adhesive formulation entailing relevant changes in its properties, determining, for instance, a transition from a hard to a rubbery behaviour, thus compromising its specific application. Furthermore, due to changes of the temperature values, the structural adhesive can be naturally subjected to a delay or increase in the curing degree. Hence adverse or positive changes in strength and stiffness can be manifested. Within this framework, the topic of the present paper is the study of the hygro-thermal durability of two commercial epoxy resins, suitable for civil engineering applications, respect to the immersion in tap water and sea water for a period of fifteen months at the temperature of 30 °C. To this scope a wide experimental program was developed comprising both End Notch Failure (ENF) tests on the adhesive samples (adherent in glass fiber reinforced polymer, GFRP) for evaluating the pure fracture energy in Mode II of the resins and the water absorption tests for resins and GFRP materials. In general, the results, in terms of fracture energy, show an initial increment (first three-four months) followed by a decrement up to the reaching of a plateau (in the ninth-twelfth month of conditioning). For what concerns the water absorption, the results show that the equilibrium value of both resins is reached in about one month, while that of GFRP samples depend on the type of liquid: three months for tap water and about five months for sea water. Considering the lower activity of the seawater, the longer time to reach the equilibrium value was an expected result.

ACS Style

Francesco Ascione; Luigi Granata; Liberata Guadagno; Carlo Naddeo. Hygrothermal durability of epoxy adhesives used in civil structural applications. Composite Structures 2021, 265, 113591 .

AMA Style

Francesco Ascione, Luigi Granata, Liberata Guadagno, Carlo Naddeo. Hygrothermal durability of epoxy adhesives used in civil structural applications. Composite Structures. 2021; 265 ():113591.

Chicago/Turabian Style

Francesco Ascione; Luigi Granata; Liberata Guadagno; Carlo Naddeo. 2021. "Hygrothermal durability of epoxy adhesives used in civil structural applications." Composite Structures 265, no. : 113591.

Journal article
Published: 17 December 2020 in Composites Part B: Engineering
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This work deals with the design of bulk nanomaterials able to provide ice protection in different applications ranging from civil to aerospace and automotive engineering. Bulk nanomaterials containing dispersed electrically conductive nanoparticles have been formulated. The heating performed through the Joule effect represents an efficient strategy to rapidly contrast extreme cold and humidity conditions, to reduce environmental pollution and to control rheological properties during the process. The effectiveness of the Joule effect has been evaluated for the same resin, characterized by low values of viscosity, containing incorporated carbon nanotubes and two different grades of expanded graphite. The comparison among the chosen fillers highlights that the nanocomposite containing incorporated the unidimensional filler reaches higher temperatures for lower values of the applied voltage. Graphite nanoplatelets can be advantageously used to reduce the viscosity of the nanomaterials. A higher expansion of the graphite allows for obtaining better performance in the heating efficiency.

ACS Style

L. Vertuccio; F. Foglia; R. Pantani; M.D. Romero-Sánchez; B. Calderón; L. Guadagno. Carbon nanotubes and expanded graphite based bulk nanocomposites for de-icing applications. Composites Part B: Engineering 2020, 207, 108583 .

AMA Style

L. Vertuccio, F. Foglia, R. Pantani, M.D. Romero-Sánchez, B. Calderón, L. Guadagno. Carbon nanotubes and expanded graphite based bulk nanocomposites for de-icing applications. Composites Part B: Engineering. 2020; 207 ():108583.

Chicago/Turabian Style

L. Vertuccio; F. Foglia; R. Pantani; M.D. Romero-Sánchez; B. Calderón; L. Guadagno. 2020. "Carbon nanotubes and expanded graphite based bulk nanocomposites for de-icing applications." Composites Part B: Engineering 207, no. : 108583.

Journal article
Published: 18 November 2020 in Nanomaterials
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In this paper, an alternative curing strategy, based on the application of an electric field, is proposed to harden nano-filled multifunctional resins. The resin is obtained through the dispersion of carbon nanotubes, which act as nanometric heater elements in the epoxy matrix. The electro-curing is activated by applying an external electric voltage, which allows tunable cross-linking within the epoxy matrix entrapped between the nanotubes. The electro-curing method allows reaching higher curing degrees with respect to the conventional ones and, consequently, higher glass transition temperatures. This is a direct consequence of the fact that the curing reactions start directly in the regions at the interphase between carbon nanotubes, acting as heater nano-filaments, and the polymeric matrix. The proposed method is able to give composites better properties, making the curing process fast and energy-saving.

ACS Style

Liberata Guadagno; Andrea Sorrentino; Patrick Delprat; Luigi Vertuccio. Design of Multifunctional Composites: New Strategy to Save Energy and Improve Mechanical Performance. Nanomaterials 2020, 10, 2285 .

AMA Style

Liberata Guadagno, Andrea Sorrentino, Patrick Delprat, Luigi Vertuccio. Design of Multifunctional Composites: New Strategy to Save Energy and Improve Mechanical Performance. Nanomaterials. 2020; 10 (11):2285.

Chicago/Turabian Style

Liberata Guadagno; Andrea Sorrentino; Patrick Delprat; Luigi Vertuccio. 2020. "Design of Multifunctional Composites: New Strategy to Save Energy and Improve Mechanical Performance." Nanomaterials 10, no. 11: 2285.

Journal article
Published: 09 July 2020 in Nanomaterials
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High-performance heater films are here proposed. They manifest great applicative potentiality in the de-icing technology of aircraft and motor vehicles. The films are suitable to be integrated into composite structures for the de/anti-icing function, which can be activated if the need arises. The heating is based on the joule effect of the current flowing through the electrically conductive films. Voltage and current parameters have been set based on the generators’ capacities on-board an aircraft and a car, as well as on the energy consumption during the operating conditions and the autonomy in the time. Green processes have been employed through all preparative steps of the films, which are composed of expanded graphite (60% wt/wt) and polyvinyl alcohol (PVA) (40% wt/wt). The results reveal a very significant influence of the aspect ratio of the filler on the heating and de-icing performance and suggest how to enhance the de-icing efficiency saving energy and adapting the current on-board aircraft/car generators for de-icing operations.

ACS Style

Liberata Guadagno; Fabiana Foglia; Roberto Pantani; Maria Dolores Romero-Sanchez; Blanca Calderón; Luigi Vertuccio. Low-Voltage Icing Protection Film for Automotive and Aeronautical Industries. Nanomaterials 2020, 10, 1343 .

AMA Style

Liberata Guadagno, Fabiana Foglia, Roberto Pantani, Maria Dolores Romero-Sanchez, Blanca Calderón, Luigi Vertuccio. Low-Voltage Icing Protection Film for Automotive and Aeronautical Industries. Nanomaterials. 2020; 10 (7):1343.

Chicago/Turabian Style

Liberata Guadagno; Fabiana Foglia; Roberto Pantani; Maria Dolores Romero-Sanchez; Blanca Calderón; Luigi Vertuccio. 2020. "Low-Voltage Icing Protection Film for Automotive and Aeronautical Industries." Nanomaterials 10, no. 7: 1343.

Journal article
Published: 03 July 2020 in Nanomaterials
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In this paper, a non-covalent π–π interaction between graphene nanoparticles (G) and a pyrene-based molecule (py) has been successfully accomplished to give the functionalized nanofillers (G-py). The proposed modification has proven to be a winning solution aimed at safeguarding the graphene’s notable electronic properties, while promoting a more effective nanofiller dispersion attributable to a decrease in viscosity with consequent improvement of the rheological properties of the formulated nanocomposites filled with G-py. The electrical current maps of the G-py based epoxy composites, loaded with filler weight percentages both above and below the electric percolation threshold (EPT), were obtained by tunneling atomic force microscopy (TUNA) technique. The possibility to detect low currents also for the sample at lower concentration (0.1 wt%) confirms the good electrical performance of the nanocomposites and, consequently, the successful performed functionalization. The non-covalent modification significantly improves the thermal stability of the unfunctionalized G of about 70 °C, thus causing an increase in the composite oxidative thermostability since the evolution of CO2 shifts to higher values. Moreover, non-covalent functionalization proved to be impactful in imparting an overall enhancement of the nanocomposite mechanical properties due to good bonding between graphene and epoxy matrix, also showing a greater roughness which is decisive in influencing the interface adhesion efficiency.

ACS Style

Maria Rossella Nobile; Marialuigia Raimondo; Carlo Naddeo; Liberata Guadagno. Rheological and Morphological Properties of Non-Covalently Functionalized Graphene-Based Structural Epoxy Resins with Intrinsic Electrical Conductivity and Thermal Stability. Nanomaterials 2020, 10, 1310 .

AMA Style

Maria Rossella Nobile, Marialuigia Raimondo, Carlo Naddeo, Liberata Guadagno. Rheological and Morphological Properties of Non-Covalently Functionalized Graphene-Based Structural Epoxy Resins with Intrinsic Electrical Conductivity and Thermal Stability. Nanomaterials. 2020; 10 (7):1310.

Chicago/Turabian Style

Maria Rossella Nobile; Marialuigia Raimondo; Carlo Naddeo; Liberata Guadagno. 2020. "Rheological and Morphological Properties of Non-Covalently Functionalized Graphene-Based Structural Epoxy Resins with Intrinsic Electrical Conductivity and Thermal Stability." Nanomaterials 10, no. 7: 1310.

Journal article
Published: 25 June 2020 in Materials Today Chemistry
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The applicative potentiality of the nanotechnologies emerges more and more in all fields of science, technology, and medicine. In this context, magnetic nanoparticles have been recently proposed as promising nanomaterials to eliminate, through minimally invasive treatments, small tumours. This work deals with the design and realization of electrospun hybrid membranes of Polycaprolactone (PCL) incorporating magnetic nanoparticles modified with the acid citric-based ligand. The nature of the ligand allows very effective compatibility between nanoparticles and hosting fibers, as deducible by the nanoparticles distribution along the fibers. Dimension and functionalization of the nanoparticles, together with the optimization of the electrospinning parameters allow obtaining highly homogeneous distribution in the diameter of the nanocharged fibers, which ranges between 500 nm and 3 μm. The anticancer activity of the optimized electrospun hybrid membranes has been analyzed toward two different melanoma cell lines: the low metastatic A375 and the high metastatic A2058, using the MTT assay. The formulated membrane exhibited a dose-dependent reduction toward both melanoma cells viability, without a decrease of activity compared to the unfunctionalized Fe3O4 nanoparticles. Promising results have been obtained also considering the antitumor activity of the hybrid Membranes toward uterine HeLa cells. Magnetic properties and structural and morphological characteristics of the functional membranes highlight very promising applications for tuning/enhancing the nanodelivery of drugs and chemotherapy assisted by electroporation technique.

ACS Style

L. Guadagno; M. Raimondo; R. Longo; M. Sarno; M. Iuliano; A. Mariconda; C. Saturnino; J. Ceramella; D. Iacopetta; M.S. Sinicropi. Development and characterization of antitumoral electrospun polycaprolactone/functionalized Fe3O4 hybrid membranes. Materials Today Chemistry 2020, 17, 100309 .

AMA Style

L. Guadagno, M. Raimondo, R. Longo, M. Sarno, M. Iuliano, A. Mariconda, C. Saturnino, J. Ceramella, D. Iacopetta, M.S. Sinicropi. Development and characterization of antitumoral electrospun polycaprolactone/functionalized Fe3O4 hybrid membranes. Materials Today Chemistry. 2020; 17 ():100309.

Chicago/Turabian Style

L. Guadagno; M. Raimondo; R. Longo; M. Sarno; M. Iuliano; A. Mariconda; C. Saturnino; J. Ceramella; D. Iacopetta; M.S. Sinicropi. 2020. "Development and characterization of antitumoral electrospun polycaprolactone/functionalized Fe3O4 hybrid membranes." Materials Today Chemistry 17, no. : 100309.

Chapter
Published: 12 March 2020 in Revolutionizing Aircraft Materials and Processes
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This chapter is focused on current shortcomings of self-healing materials for their applications in aeronautics. In particular, the critical points, which prevented the application and the widespread use of these materials in aircraft structures, will be discussed. After “the state of the art” on the design of current developed structural self-healing materials and their drawbacks for application as aircraft materials, recent achievements in this field, able to overcome current drawbacks, will be described. The possibility to simultaneously impart other specific functions, which can be integrated in the material together with the auto-repair function, will be considered.

ACS Style

L. Guadagno; C. Naddeo; L. Vertuccio; E. Calabrese; G. Barra; M. Raimondo. Self-Healing Mechanisms in Multifunctional Structural Materials. Revolutionizing Aircraft Materials and Processes 2020, 277 -302.

AMA Style

L. Guadagno, C. Naddeo, L. Vertuccio, E. Calabrese, G. Barra, M. Raimondo. Self-Healing Mechanisms in Multifunctional Structural Materials. Revolutionizing Aircraft Materials and Processes. 2020; ():277-302.

Chicago/Turabian Style

L. Guadagno; C. Naddeo; L. Vertuccio; E. Calabrese; G. Barra; M. Raimondo. 2020. "Self-Healing Mechanisms in Multifunctional Structural Materials." Revolutionizing Aircraft Materials and Processes , no. : 277-302.

Journal article
Published: 29 February 2020 in Nanomaterials
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In the present study, nanocomposite materials for structural applications with self-sensing properties are proposed. In particular, suitable processing of epoxy resins filled with carbon nanotubes and expanded graphite characterized by very different aspect ratio leads to nanocomposite systems with high glass transition temperatures and remarkable values of the gauge factor. In particular, this notable property ranges between four, for composites filled with one-dimensional nanofiller, and 39 for composites with two-dimensional (2D) graphite derivatives. The greater sensitivity of the 2D system against permanent deformations is interpreted on the basis of an empirical mathematical model and morphological descriptions. The larger inter-contact area among the graphite layers determines a larger contact resistance change than that occurring among carbon nanotubes. The proposed systems turn out to be very advantageous in strain-sensor applications where damage detection is a key requirement to guarantee the reliability of the structures and the safety of the end-users.

ACS Style

Giovanni Spinelli; Patrizia Lamberti; Vincenzo Tucci; Liberata Guadagno; Luigi Vertuccio. Damage Monitoring of Structural Resins Loaded with Carbon Fillers: Experimental and Theoretical Study. Nanomaterials 2020, 10, 434 .

AMA Style

Giovanni Spinelli, Patrizia Lamberti, Vincenzo Tucci, Liberata Guadagno, Luigi Vertuccio. Damage Monitoring of Structural Resins Loaded with Carbon Fillers: Experimental and Theoretical Study. Nanomaterials. 2020; 10 (3):434.

Chicago/Turabian Style

Giovanni Spinelli; Patrizia Lamberti; Vincenzo Tucci; Liberata Guadagno; Luigi Vertuccio. 2020. "Damage Monitoring of Structural Resins Loaded with Carbon Fillers: Experimental and Theoretical Study." Nanomaterials 10, no. 3: 434.

Journal article
Published: 12 November 2019 in Polymers
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A suitably modified resin film infusion (RFI) process was used for manufacturing carbon fiber-reinforced composites (CFRCs) impregnated with a resin containing nanocages of glycidyl polyhedral oligomeric silsesquioxane (GPOSS) for enhancing flame resistance and multi-wall carbon nanotubes (MWCNTs) to contrast the electrical insulating properties of the epoxy resin. The effects of the different numbers (7, 14 and 24) of the plies on the equivalent direct current (DC) and alternating current (AC) electrical conductivity were evaluated. All the manufactured panels manifest very high values in electrical conductivity. Besides, for the first time, CFRC strings were analyzed by tunneling atomic force microscopy (TUNA) technique. The electrical current maps highlight electrically conductive three-dimensional networks incorporated in the resin through the plies of the panels. The highest equivalent bulk conductivity is shown by the seven-ply panel characterized by the parallel (σ//0°) in-plane conductivity of 16.19 kS/m. Electrical tests also evidence that the presence of GPOSS preserves the AC electrical stability of the panels.

ACS Style

Liberata Guadagno; Luigi Vertuccio; Carlo Naddeo; Marialuigia Raimondo; Giuseppina Barra; Felice De Nicola; Ruggero Volponi; Patrizia Lamberti; Giovanni Spinelli; Vincenzo Tucci. Electrical Current Map and Bulk Conductivity of Carbon Fiber-Reinforced Nanocomposites. Polymers 2019, 11, 1865 .

AMA Style

Liberata Guadagno, Luigi Vertuccio, Carlo Naddeo, Marialuigia Raimondo, Giuseppina Barra, Felice De Nicola, Ruggero Volponi, Patrizia Lamberti, Giovanni Spinelli, Vincenzo Tucci. Electrical Current Map and Bulk Conductivity of Carbon Fiber-Reinforced Nanocomposites. Polymers. 2019; 11 (11):1865.

Chicago/Turabian Style

Liberata Guadagno; Luigi Vertuccio; Carlo Naddeo; Marialuigia Raimondo; Giuseppina Barra; Felice De Nicola; Ruggero Volponi; Patrizia Lamberti; Giovanni Spinelli; Vincenzo Tucci. 2019. "Electrical Current Map and Bulk Conductivity of Carbon Fiber-Reinforced Nanocomposites." Polymers 11, no. 11: 1865.

Journal article
Published: 16 September 2019 in Materials
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Different industrial mixing methods and some of their combinations ((1) ultrasound; (2) mechanical stirring; (3) by roller machine; (4) by gears machine; and (5) ultrasound radiation + high stirring) were investigated for incorporating multi-walled carbon nanotubes (MWCNT) into a resin based on an aeronautical epoxy precursor cured with diaminodiphenylsulfone (DDS). The effect of different parameters, ultrasound intensity, number of cycles, type of blade, and gear speed on the nanofiller dispersion were analyzed. The inclusion of the nanofiller in the resin causes a drastic increase in the viscosity, preventing the homogenization of the resin and a drastic increase in temperature in the zones closest to the ultrasound probe. To face these challenges, the application of high-speed agitation simultaneously with the application of ultrasonic radiation was applied. This allowed, on the one hand, a homogeneous dispersion, and on the other hand, an improvement of the dissipation of heat generated by ultrasonic radiation. The most efficient method was a combination of ultrasound radiation assisted by a high stirring method with the calendar, which was used for the preparation of a carbon fiber reinforced panel (CFRP). The manufactured panel was subjected to dynamic and vibroacoustic tests in order to characterize structural damping and sound transmission loss properties. Under both points of view, the new formulation demonstrated an improved efficiency with reference to a standard CFRP equivalent panel. In fact, for this panel, the estimated damping value was well above the average of the typical values representative of the carbon fiber laminates (generally less than 1%), and also a good vibroacoustic performance was detected as the nanotube based panel exhibited a higher sound transmission loss (STL) at low frequencies, in correspondence with the normal mode participation region. The manufactured panel was also characterized in terms of fire performance using a cone calorimeter and the results were compared to those obtained using a commercially available monocomponent RTM6 (Hexcel composites) epoxy aeronautic resin with the same process and the same fabric and lamination. Compared to the traditional RTM6 resin, the panel with the epoxy nanofilled resin exhibits a significant improvement in fire resistance properties both in terms of a delay in the ignition time and in terms of an increase in the thermal resistance of the material. Compared to the traditional panel, made in the same conditions as the RTM6 resin, the time of ignition of the nanotube-based panel increased by 31 seconds while for the same panel, the heat release rate at peak, the average heat release rate, and the total heat release decreased by 21.4%, 48.5%, and 15%, respectively. The improvement of the fire performance was attributed to the formation of a non-intumescent char due to the simultaneous presence of GPOSS and carbon nanotubes.

ACS Style

Giuseppina Barra; Liberata Guadagno; Luigi Vertuccio; Bartolome Simonet; Bricio Santos; Mauro Zarrelli; Maurizio Arena; Massimo Viscardi. Different Methods of Dispersing Carbon Nanotubes in Epoxy Resin and Initial Evaluation of the Obtained Nanocomposite as a Matrix of Carbon Fiber Reinforced Laminate in Terms of Vibroacoustic Performance and Flammability. Materials 2019, 12, 2998 .

AMA Style

Giuseppina Barra, Liberata Guadagno, Luigi Vertuccio, Bartolome Simonet, Bricio Santos, Mauro Zarrelli, Maurizio Arena, Massimo Viscardi. Different Methods of Dispersing Carbon Nanotubes in Epoxy Resin and Initial Evaluation of the Obtained Nanocomposite as a Matrix of Carbon Fiber Reinforced Laminate in Terms of Vibroacoustic Performance and Flammability. Materials. 2019; 12 (18):2998.

Chicago/Turabian Style

Giuseppina Barra; Liberata Guadagno; Luigi Vertuccio; Bartolome Simonet; Bricio Santos; Mauro Zarrelli; Maurizio Arena; Massimo Viscardi. 2019. "Different Methods of Dispersing Carbon Nanotubes in Epoxy Resin and Initial Evaluation of the Obtained Nanocomposite as a Matrix of Carbon Fiber Reinforced Laminate in Terms of Vibroacoustic Performance and Flammability." Materials 12, no. 18: 2998.

Journal article
Published: 30 July 2019 in Polymers
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Hoveyda-Grubbs 2nd generation catalyst that has the alkylidene functionalized with pyrene (HG2pyrene) was synthesized and characterized. This catalyst can be bound to carbonaceous filler (graphite, graphene or carbon nanotubes) by π-stacking interaction, but, since the catalytic site become poorly accessible to the incoming monomer, its activity in the ROMP (Ring Opening Metathesis Polymerization) is reduced. This is due to the fact that the above interaction also occurs with the aryl groups of NHC ligand of the ruthenium, as demonstrated by nuclear magnetic resonance and by fluorescence analysis of a solution of the catalyst with a molecule that simulated the structure of graphene. Very interesting results were obtained using HG2pyrene as a catalyst in the ROMP of 2-norbornene and 1,5-cyclooctadiene. The activity of this catalyst was the same as that obtained with the classical commercial HG2. Obviously, the polymers obtained with catalyst HG2pyrene have a pyrene as a chain end group. This group can give a strong π-stacking interaction with carbonaceous filler, producing a material that is able to promote the dispersion of other materials such as graphite in the polymer matrix.

ACS Style

Annaluisa Mariconda; Anna Agovino; Marco Sirignano; Liberata Guadagno. Strong Interaction with Carbon Filler of Polymers Obtained by Pyrene Functionalized Hoveyda-Grubbs 2nd Generation Catalyst. Polymers 2019, 11, 1261 .

AMA Style

Annaluisa Mariconda, Anna Agovino, Marco Sirignano, Liberata Guadagno. Strong Interaction with Carbon Filler of Polymers Obtained by Pyrene Functionalized Hoveyda-Grubbs 2nd Generation Catalyst. Polymers. 2019; 11 (8):1261.

Chicago/Turabian Style

Annaluisa Mariconda; Anna Agovino; Marco Sirignano; Liberata Guadagno. 2019. "Strong Interaction with Carbon Filler of Polymers Obtained by Pyrene Functionalized Hoveyda-Grubbs 2nd Generation Catalyst." Polymers 11, no. 8: 1261.

Journal article
Published: 25 July 2019 in Materials
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Electromagnetic and thermal properties of a non-conventional polymer nanocomposite based on thermoplastic Polylactic acid (PLA, Ingeo™) filled, in different weight percentage, with multi-walled carbon nanotubes (MWCNTs), graphene nanoplatelets (GNPs), as well as a mixture of both fillers (MWCNTs/GNPs), are analyzed. The combination of notable electrical, thermal, and electromagnetic (EM) properties of the carbon fillers, in concentrations above the percolation threshold, together with the good processability of the PLA matrix gives rise to innovative filaments for 3D printing. In particular, the shielding efficiency (SE) in the frequency range 26-37 GHz of samples increases from 0.20 dB of unfilled PLA up to 13.4 dB for composites containing MWCNTs and GNPs, corresponding to 4% and 95% of SE, respectively. The thermal conductivity of the PLA loaded with 12 wt % of GNPs is 263% higher than that of the unfilled polymer, whereas an improvement of about 99% and 190% is detected for the PLA matrix loaded with MWCNTs and both fillers, respectively. The EM and thermal characterization is combined with a morphological investigation allowing us to correlate the dispersion states of the fillers within the polymer matrix with the observed EM and thermal properties. The EM and thermal characteristics exhibited by the nanocomposites make them suitable for packaging applications of electronic devices with electromagnetic interference (EMI) shielding and thermal dissipation features.

ACS Style

Giovanni Spinelli; Patrizia Lamberti; Vincenzo Tucci; Rumiana Kotsilkova; Evgeni Ivanov; Dzhihan Menseidov; Carlo Naddeo; Vittorio Romano; Liberata Guadagno; Renata Adami; Darya Meisak; Dzmitry Bychanok; Polina Kuzhir. Nanocarbon/Poly(Lactic) Acid for 3D Printing: Effect of Fillers Content on Electromagnetic and Thermal Properties. Materials 2019, 12, 2369 .

AMA Style

Giovanni Spinelli, Patrizia Lamberti, Vincenzo Tucci, Rumiana Kotsilkova, Evgeni Ivanov, Dzhihan Menseidov, Carlo Naddeo, Vittorio Romano, Liberata Guadagno, Renata Adami, Darya Meisak, Dzmitry Bychanok, Polina Kuzhir. Nanocarbon/Poly(Lactic) Acid for 3D Printing: Effect of Fillers Content on Electromagnetic and Thermal Properties. Materials. 2019; 12 (15):2369.

Chicago/Turabian Style

Giovanni Spinelli; Patrizia Lamberti; Vincenzo Tucci; Rumiana Kotsilkova; Evgeni Ivanov; Dzhihan Menseidov; Carlo Naddeo; Vittorio Romano; Liberata Guadagno; Renata Adami; Darya Meisak; Dzmitry Bychanok; Polina Kuzhir. 2019. "Nanocarbon/Poly(Lactic) Acid for 3D Printing: Effect of Fillers Content on Electromagnetic and Thermal Properties." Materials 12, no. 15: 2369.