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310 results on '"Colangelo, Francesco"'

1. The Perfect Matching Hamiltonian property in Prism and Crossed Prism graphs

Author

Colangelo, Francesco and Romaniello, Federico

Subjects
Mathematics - Combinatorics, 05C15, 05C45, 05C70
Abstract

A graph $G$ has the \emph{Perfect Matching Hamiltonian property} (or for short, $G$ is $PMH$) if, for each one of its perfect matchings, there is another perfect matching of $G$ such that the union of the two perfect matchings yields a Hamiltonian cycle of $G$. In this note, we show that \emph{Prism graphs} $\cP_n$ are not $PMH$, except for the $Cube\ graph$, and indicate for which values of $n$ the \emph{Crossed Prism graphs} $\cCP_n$ are $PMH$., Comment: 19 pages, 9 figures. arXiv admin note: substantial text overlap with arXiv:2106.00513

Published
2024

2. The association scheme on the set of flags of a finite generalized quadrangle

Author

Colangelo, Francesco, Monzillo, Giusy, and Siciliano, Alessandro

Subjects
Mathematics - Combinatorics
Abstract

In this paper, the association scheme defined on the flags of a finite generalized quadrangle is considered. All possible fusions of this scheme are listed, and a full description for those of classes 2 and 3 is given. Furthermore, it is showed that an association scheme with appropriate parameters must arise from the flags of a generalized quadrangle. The same is done for one of its 4-class symmetric fusion.

Published
2024
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3. Electron localization in periodically strained graphene

Author

Giambastiani, Davide, Colangelo, Francesco, Tredicucci, Alessandro, Roddaro, Stefano, and Pitanti, Alessandro

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

Pseudo-magnetic field (PMF) in deformed graphene has been proposed as a promising and flexible method to quantum-confine electronic states and create gaps in the local density of states. Motivated by this perspective, we numerically analyze various different configurations leading to electronic localization and band flattening in periodically strained graphene. In particular, we highlight the existence of a fine structure in the pseudo-Landau levels confined in large-PMF regions, the emergence of states confined to PMF nodes as well as of snake-like orbits. In our paper, we further analyze the importance of the relative rotation and asymmetry of the strain lattice with respect to the atomic lattice and show how it can be used to modulate the PMF periodicity and to create localized orbits far from the strain points. Possible implementations and applications of the simulated structures are discussed.

Published
2021
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5. Green Materials

Author

Singh, Narinder, primary, Colangelo, Francesco, additional, and Farina, Ilenia, additional

Published
2023
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6. Stress-strain in electron-beam activated polymeric micro-actuators

Author

Giambastiani, Davide, Dispinzeri, Fabio, Colangelo, Francesco, Forti, Stiven, Coletti, Camilla, Tredicucci, Alessandro, Pitanti, Alessandro, and Roddaro, Stefano

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics, Physics - Applied Physics
Abstract

Actuation of thin polymeric films via electron irradiation is a promising avenue to realize devices based on strain engineered two dimensional (2D) materials. Complex strain profiles demand a deep understanding of the mechanics of the polymeric layer under electron irradiation; in this article we report a detailed investigation on electron-induced stress on poly-methyl-methacrylate (PMMA) thin film material. After an assessment of stress values using a method based on dielectric cantilevers, we directly investigate the lateral shrinkage of PMMA patterns on epitaxial graphene, which reveals a universal behavior, independent of the electron acceleration energy. By knowing the stress-strain curve, we finally estimate an effective Young's modulus of PMMA on top of graphene which is a relevant parameter for PMMA based electron-beam lithography and strain engineering applications.

Published
2020
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7. Local tuning of WS2 photoluminescence using polymeric micro-actuators in a monolithic van der Waals heterostructure

Author

Colangelo, Francesco, Morandi, Andrea, Forti, Stiven, Fabbri, Filippo, Coletti, Camilla, Di Girolamo, Flavia Viola, Di Lieto, Alberto, Tonelli, Mauro, Tredicucci, Alessandro, Pitanti, Alessandro, and Roddaro, Stefano

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Materials Science
Abstract

The control of the local strain profile in 2D materials offers an invaluable tool for tailoring the electronic and photonic properties of solid-state devices. In this paper, we demonstrate a local engineering of the exciton photoluminescence (PL) energy of monolayer tungsten disulfide (WS2) by means of strain. We apply a local uniaxial stress to WS2 by exploiting electron-beam patterned and actuated polymeric micrometric artificial muscles (MAMs), which we implement onto monolithic synthetic WS2/graphene heterostructures. We show that MAMs are able to induce an in-plane stress to the top WS2 layer of the van der Waals heterostructure and that the latter can slide on the graphene underneath with negligible friction. As a proof of concept for the local strain-induced PL shift experiments, we exploit a two-MAM configuration in order to apply uniaxial tensile stress on well-defined micrometric regions of WS2. Remarkably, our architecture does not require the adoption of fragile suspended microstructures. We observe a spatial modulation of the excitonic PL energy of the WS2 monolayers under stress, which agrees with the expected strain profile and attains a maximum redshift of about 40 meV at the maximum strain intensity point. After the actuation, a time-dependent PL blueshift is observed in agreement with the viscoelastic properties of the polymeric MAMs. Our approach enables inducing local and arbitrary deformation profiles and circumvents some key limitations and technical challenges of alternative strain engineering methods requiring the 2D material transfer and production of suspended membranes., Comment: This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in APL and may be found at https://aip.scitation.org/doi/10.1063/1.5122262

Published
2019
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9. Local anodic oxidation on hydrogen-intercalated graphene layers: oxide composition analysis and role of the silicon carbide substrate

Author

Colangelo, Francesco, Piazza, Vincenzo, Coletti, Camilla, Roddaro, Stefano, Beltram, Fabio, and Pingue, Pasqualantonio

Subjects
Condensed Matter - Materials Science
Abstract

We investigate nanoscale local anodic oxidation (LAO) on hydrogen-intercalated graphene grown by controlled sublimation of silicon carbide (SiC). Scanning probe microscopy (SPM) was used as a lithographic and characterization tool in order to investigate the local properties of the nanofabricated structures. The anomalous thickness observed after the graphene oxidation process is linked to the impact of LAO on the substrate. Micro-Raman spectroscopy was employed to demonstrate the presence of two oxidation regimes depending on the applied bias. We show that partial and total etching of monolayer graphene can be achieved by tuning the bias voltage during LAO. Finally, a complete compositional characterization was achieved by scanning electron microscopy and energy dispersive spectroscopy (EDS)., Comment: 6 pages, 4 figures

Published
2018
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11. Stretching graphene using polymeric micro-muscles

Author

Colangelo, Francesco, Pitanti, Alessandro, Mišeikis, Vaidotas, Coletti, Camilla, Pingue, Pasqualantonio, Pisignano, Dario, Beltram, Fabio, Tredicucci, Alessandro, and Roddaro, Stefano

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Materials Science
Abstract

The control of strain in two-dimensional materials opens exciting perspectives for the engineering of their electronic properties. While this expectation has been validated by artificial-lattice studies, it remains elusive in the case of atomic lattices. Remarkable results were obtained on nanobubbles and nano-wrinkles, or using scanning probes; microscale strain devices were implemented exploiting deformable substrates or external loads. These devices lack, however, the flexibility required to fully control and investigate arbitrary strain profiles. Here, we demonstrate a novel approach making it possible to induce strain in graphene using polymeric micrometric artificial muscles (MAMs) that contract in a controllable and reversible way under an electronic stimulus. Our method exploits the mechanical response of poly-methyl-methacrylate (PMMA) to electron-beam irradiation. Inhomogeneous anisotropic strain and out-of-plane deformation are demonstrated and studied by Raman, scanning-electron and atomic-force microscopy. These can all be easily combined with the present device architecture. The flexibility of the present method opens new opportunities for the investigation of strain and nanomechanics in two-dimensional materials.

Published
2017
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12. Advancements in Lightweight Artificial Aggregates: Typologies, Compositions, Applications, and Prospects for the Future.

Author

Singh, Narinder, Raza, Jehangeer, Colangelo, Francesco, and Farina, Ilenia

Abstract

Currently, the environment and its natural resources face many issues related to the depletion of natural resources, in addition to the increase in environmental pollution resulting from uncontrolled waste disposal. Therefore, it is crucial to identify practical and effective ways to utilize these wastes, such as transforming them into environmentally friendly concrete. Artificial lightweight aggregates (ALWAs) are gaining interest because of their shift in focus from natural aggregates. Researchers have developed numerous ALWAs to eliminate the need for natural aggregates. This article explores the diverse applications of ALWAs across different industries. ALWAs are currently in the research phase due to various limitations compared to the availability of the various natural aggregates that form more durable solutions. However, researchers have discovered that certain artificial aggregates prioritize weight over strength, allowing for the effective use of ALWAs in applications like pavements. We thoroughly studied the various ALWAs discussed in this article and found that fly ash and construction waste are the most diverse sources of primary material for ALWAs. However, the production of these aggregates also presents challenges in terms of processing and optimization. This article's case study reveals that ALWAs, consisting of 80% fly ash, 5% blast-furnace slag, and only 15% cement, can yield a sustainable solution. In the single- and double-step palletization, the aggregate proved to be less environmentally harmful. Additionally, the production of ALWAs has a reduced carbon footprint due to the recycling of various waste materials, including aggregates derived from fly ash, marble sludge, and ground granulated blast-furnace slag. Despite their limited mechanical strength, the aggregates exhibit superior performance, making them suitable for use in high-rise buildings and landscapes. Researchers have found that composition plays a key role in determining the application-based properties of aggregates. This article also discusses environmental and sustainability considerations, as well as future trends in the LWA field. Simultaneously, recycling ALWAs can reduce waste and promote sustainable construction. However, this article discusses and researches the challenges associated with the production and processing of ALWAs. [ABSTRACT FROM AUTHOR]

Published
2024
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15. Anisotropic straining of graphene using micropatterned SiN membranes

Author

Settembrini, Fabiana Francesca, Colangelo, Francesco, Pitanti, Alessandro, Miseikis, Vaidotas, Coletti, Camilla, Menichetti, Guido, Colle, Renato, Grosso, Giuseppe, Tredicucci, Alessandro, and Roddaro, Stefano

Subjects
Condensed Matter - Materials Science
Abstract

We use micro-Raman spectroscopy to study strain profiles in graphene monolayers suspended over SiN membranes micropatterned with holes of non-circular geometry. We show that a uniform differential pressure load $\Delta P$ over elliptical regions of free-standing graphene yields measurable deviations from hydrostatic strain conventionally observed in radially-symmetric microbubbles. The top hydrostatic strain $\bar{\varepsilon}$ we observe is estimated to be $\approx0.7\%$ for $\Delta P = 1\,{\rm bar}$ in graphene clamped to elliptical SiN holes with axis $40$ and $20\,{\rm \mu m}$. In the same configuration, we report a $G_\pm$ splitting of $10\,{\rm cm^{-1}}$ which is in good agreement with the calculated anisotropy $\Delta\varepsilon \approx 0.6\%$ for our device geometry. Our results are consistent with the most recent reports on the Gr\"uneisen parameters. Perspectives for the achievement of arbitrary strain configurations by designing suitable SiN holes and boundary clamping conditions are discussed., Comment: 8 pages, 6 figure (including SI)

Published
2016

16. Thermal noise and optomechanical features in the emission of a membrane-coupled compound cavity laser diode

Author

Baldacci, Lorenzo, Pitanti, Alessandro, Masini, Luca, Arcangeli, Andrea, Colangelo, Francesco, Navarro-Urrios, Daniel, and Tredicucci, Alessandro

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics, Physics - Optics
Abstract

We demonstrate the use of a compound optical cavity as linear displacement detector, by measuring the thermal motion of a silicon nitride suspended membrane acting as the external mirror of a near-infrared Littrow laser diode. Fluctuations in the laser optical power induced by the membrane vibrations are collected by a photodiode integrated within the laser, and then measured with a spectrum analyzer. The dynamics of the membrane driven by a piezoelectric actuator is investigated as a function of air pressure and actuator displacement in a homodyne configuration. The high Q-factor ($\sim 3.4\cdot 10^4$ at $8.3 \cdot 10^{-3}$ mbar) of the fundamental mechanical mode at $\sim 73$ kHz guarantees a detection sensitivity high enough for direct measurement of thermal motion at room temperature ($\sim 87$ pm RMS). The compound cavity system here introduced can be employed as a table-top, cost-effective linear displacement detector for cavity optomechanics. Furthermore, thanks to the strong optical nonlinearities of the laser compound cavity, these systems open new perspectives in the study of non-Markovian quantum properties at the mesoscale.

Published
2016

19. List of contributors

Author

Abdollahnejad, Zahra, primary, Al-Mansour, Ahmed, additional, Al-Tamimi, Adil K., additional, Altıner, Mahmut, additional, Alzaza, A., additional, Bhogayata, Ankur C., additional, Borrachero, M.V., additional, Cao, Trinh, additional, Çevik, Abdulkadir, additional, Chindaprasirt, P., additional, Chindaprasirt, Prinya, additional, Cioffi, Raffaele, additional, Colangelo, Francesco, additional, Dave, Shemal V., additional, Dong, Minhao, additional, Ducman, V., additional, Ekinci, Enes, additional, Elchalakani, Mohamed, additional, Farina, Ilenia, additional, Farzadnia, Nima, additional, Fattah, Kazi P., additional, Gao, Zhili (Jerry), additional, Gholampour, Aliakbar, additional, Gunasekara, Chamila, additional, Illikainen, M., additional, Kantarci, Fatih, additional, Karakoç, Mehmet Burhan, additional, Karhu, M., additional, Kashani, Alireza, additional, Kinnunen, P., additional, Law, David W., additional, Lokuge, Weena, additional, Lopes, Adelino, additional, Lopes, Sérgio, additional, Luukkonen, Tero, additional, Malovrh Rebec, K., additional, Mastali, M., additional, Miraldo, Sérgio, additional, Mohseni, Ehsan, additional, Monzó, J., additional, Niş, Anıl, additional, Ozbakkaloglu, Togay, additional, Özcan, Ahmet, additional, Pacheco-Torgal, Fernando, additional, Payá, J., additional, Petrillo, Antonella, additional, Ruan, Shaoqin, additional, Salzano, Cinzia, additional, Sata, Vanchai, additional, Setunge, Sujeeva, additional, Soriano, L., additional, Sukontasukkul, Piti, additional, Sun, Zengqing, additional, Tashima, M.M., additional, Top, Soner, additional, Travaglioni, Marta, additional, Türkmen, Ibrahim, additional, Vapur, Hüseyin, additional, Xie, Tianyu, additional, Yang, Mijia, additional, Yliniemi, Juho, additional, Zannerni, Ghina M., additional, Zeng, Qiang, additional, Zhao, Xinyu, additional, and Zhou, Xiangming, additional

Published
2022
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21. List of contributors

Author

Abdulsalam, Bahira, primary, Ahmed, Hemn Unis, additional, Ajalloeian, Rassoul, additional, Al-Mansour, Ahmed, additional, Alengaram, U. Johnson, additional, Alsalman, Ali, additional, Ameri, Farshad, additional, Assi, Lateef N., additional, Atabakhsh, Erfan, additional, Behforouz, Babak, additional, Blanco, I., additional, Boroujeni, Mahdi, additional, Boudali, Sara, additional, Busari, Ayobami, additional, Carter, Kealy, additional, Chen, Xueqin, additional, Cioffi, Raffaele, additional, Colangelo, Francesco, additional, Convertino, F., additional, Cossentino, Luigi, additional, Dadsetan, Sina, additional, Das, Shaswat Kumar, additional, de Brito, Jorge, additional, Demartino, Cristoforo, additional, Dhinakaran, G., additional, Divyah, N., additional, Dong, Qiao, additional, Elkordi, A.M., additional, ElSafty, Adel, additional, Evangelista de Lara, Beatriz Leão, additional, Faleschini, Flora, additional, Faraj, Rabar H., additional, Farina, Ilenia, additional, Gajanayake, Akvan, additional, Godbout, Stephan, additional, Hadjimitsis, Diofantos, additional, Hafez, Hisham, additional, Hama ali, Hunar F., additional, Huseien, Ghasan Fahim, additional, Jamalimoghadam, Mohammad, additional, Jena, Malaya Kumar, additional, Karimzadeh, Misagh, additional, Kashani, Alireza, additional, Kazmi, Syed Minhaj Saleem, additional, Khatib, J.M., additional, Krishna, R.S., additional, Kurda, Rawaz, additional, Kyriakides, Nicholas, additional, Lachemi, Mohamed, additional, Li, Jie, additional, Li, Le, additional, Liu, Jiahan, additional, Lu, Tingfeng, additional, Machaka, M.M., additional, Mahmood, Aziz Hasan, additional, Mahmoodi, Obaid, additional, Makul, Natt, additional, Manso, Juan M., additional, Mishra, Subhabrata, additional, Moccia, Ivan, additional, Munir, Muhammad Junaid, additional, Mustakim, Syed Mohammed, additional, Neocleous, Kyriacos, additional, Olivares, Renato, additional, Ortega-López, Vanesa, additional, Palacios, Johann, additional, Panesar, Daman K., additional, Penteado, Carmenlucia Santos Giordano, additional, Petrillo, Antonella, additional, Polydorou, Thomaida, additional, Poncet, Sébastien, additional, Prakash, R., additional, Puca, Salvatore, additional, Qureshi, Tanvir S., additional, Raman, Sudharshan N., additional, Ramondo, Antonio, additional, Revilla-Cuesta, Víctor, additional, Rosado, Laís Peixoto, additional, Ruggiero, Marco, additional, Saberian, Mohammad, additional, Saffarzadeh, Amirhomayoun, additional, Şahmaran, Mustafa, additional, Sahu, Trilochan, additional, Salzano, Cinzia, additional, Scarascia-Mugnozza, G., additional, Schettini, E., additional, Shah, Kwok Wei, additional, Sherwani, Aryan Far H., additional, Shoaei, Parham, additional, Siad, Hocine, additional, Silvestre, José, additional, Skaf, Marta, additional, Soliman, Ahmed, additional, Subramanian, C., additional, Travaglioni, Marta, additional, Tripathy, Ankit Kumar, additional, Vivek, S.S., additional, Vox, G., additional, Wang, Jiyang, additional, Wu, Yu-Fei, additional, Xia, Jin, additional, Xu, Jinyi, additional, Zanini, Mariano Angelo, additional, Zareei, Seyed Alireza, additional, Zeng, Qiang, additional, Zhang, Guomin, additional, Zhang, Jingxuan, additional, Zhang, Runxiao, additional, and Ziehl, Paul, additional

Published
2022
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26. Revealing the atomic structure of the buffer layer between SiC(0001) and epitaxial graphene

Author

Goler, Sarah, Coletti, Camilla, Piazza, Vincenzo, Pingue, Pasqualantonio, Colangelo, Francesco, Pellegrini, Vittorio, Emtsev, Konstantin V., Forti, Stiven, Starke, Ulrich, Beltram, Fabio, and Heun, Stefan

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

On the SiC(0001) surface (the silicon face of SiC), epitaxial graphene is obtained by sublimation of Si from the substrate. The graphene film is separated from the bulk by a carbon-rich interface layer (hereafter called the buffer layer) which in part covalently binds to the substrate. Its structural and electronic properties are currently under debate. In the present work we report scanning tunneling microscopy (STM) studies of the buffer layer and of quasi-free-standing monolayer graphene (QFMLG) that is obtained by decoupling the buffer layer from the SiC(0001) substrate by means of hydrogen intercalation. Atomic resolution STM images of the buffer layer reveal that, within the periodic structural corrugation of this interfacial layer, the arrangement of atoms is topologically identical to that of graphene. After hydrogen intercalation, we show that the resulting QFMLG is relieved from the periodic corrugation and presents no detectable defect sites.

Published
2011
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27. Effect of unit cell shape and structure volume fraction on the mechanical and vibration properties of 3D printed lattice structures.

Author

Singh, Gurminder, Singh, Jasvinder, Singh, Narinder, Farina, Ilenia, Colangelo, Francesco, and Pandey, Pulak Mohan

Subjects
VIBRATION (Mechanics), UNIT cell, CELL morphology, BAND gaps, FUSED deposition modeling
Abstract

Lattice structures have been proven to be one of the best choices since their inception, for various structural and other commercial applications, for enhanced mechanical properties, especially in the case of vibration isolation, where band gaps play a vital role. In the present study, additively manufactured 3D printed lattices are prepared with the help of fused deposition modelling (FDM) under various design variations such as Diamond, Kelvin, and Octa formations. Further, three variations in the form of cell density have been used in all the designs, such as low, medium, and high density. The effect of the design variations on Young's modulus, ultimate compressive strength, and plateau stress have been studied, and comparative analysis amongst the designs has been carried out. In the case of the diamond foam, the Young's modulus of 54.84, 79.43, and 63.13 MPa has been obtained for low, medium, and high density, respectively. However, in the case of Octa formation with a high-density apology, highest value of young modulus is obtained, which is 174.94 MPa. But the plateau stress is the best in the case of high-density diamond topology and least in the case of high-density Octa formation. In addition, the diamond foam with the medium density has shown the best compressive strength, i.e., 5.003 MPa. Moreover, vibration analysis properties were explored; interestingly, it has been seen that the transmissivity of the medium-form structures for all shapes is higher than the others whereas the natural frequency of the Diamond and Octa shapes is lower. Hence the shape and form of the lattice have a significant effect on the final properties of the lattices and lattice structures contribute to structural integrity in terms of better properties and enhanced behaviour. [ABSTRACT FROM AUTHOR]

Published
2024
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32. Characterization of Eco-Friendly Lightweight Aggregate Concretes Incorporating Industrial Wastes

Author

Sadrolodabaee, Payam, Di Rienzo, Gianmarco, Farina, Ilenia, Salzano, Cinzia, Singh, Narinder, Colangelo, Francesco, and Universitat Politècnica de Catalunya. Departament d'Enginyeria Civil i Ambiental

Subjects
Recycled aggregates, Industrial wastes, Waste PET, Mechanics of Materials, Mechanical Engineering, Aggregates (Building materials)--Recycling, Àrids (Materials de construcció) -- Reciclatge, Thermal behavior, Enginyeria civil::Materials i estructures::Materials i estructures de formigó [Àrees temàtiques de la UPC], General Materials Science, MSWI fly ash, Mechanical property, Lightweight concrete
Abstract

Towards the sustainable development goals in the built environment, the use of waste and recycled sources has been attaining great interest among researchers and policy-makers, especially in concrete as the most used construction material. Excess use of natural aggregates, as one of the main components of concrete, causes the depletion of natural resources and the associated environmental problems, thus, the use of artificial and recycled aggregates is of great importance. In this regard, the production of lightweight artificial aggregates from industrial and hazardous wastes may be a promising solution that not only mitigates the depletion of natural resources but also stabilize those kinds of wastes. This study aimed to investigate the production of concrete with recycled aggregates from industrial wastes, mainly municipal solid waste incineration fly ash (MSWI-FA). To this end, different kinds of mix designs to manufacture the aggregates were developed based on MSWI-FA, ground granulated blast furnace slag (GGBFS), marble sludge (MS), and cement. The concrete samples containing different artificial aggregates, as well as recycled polyethylene terephthalate (PET) in the sand form, were produced and the properties, including compressive strength and thermal insulation, were evaluated. The obtained results of the lightweight concrete demonstrated enhanced thermal property (up to 30%), but at least 30% lower resistance with respect to the normal concrete produced from the natural aggregate.

Published
2023
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35. Contributors

Author

Van Acker, Karel, primary, Alba-Rodríguez, Mª Desirée, additional, Azevedo, Cecilia, additional, Bignozzi, Maria Chiara, additional, Bonifazi, Giuseppe, additional, Cao, Mingli, additional, Carrascal, Isidro A., additional, Cha, Gi-Wook, additional, Chindaprasirt, Prinya, additional, Cimentada, Ana, additional, Cioffi, Raffaele, additional, Colangelo, Francesco, additional, Belie, Nele De, additional, del Río Merino, Mercedes, additional, Di Maria, Andrea, additional, Ding, Yining, additional, Dong, Huiwen, additional, Engelsen, Christian John, additional, Etxeberria, Miren, additional, Eyckmans, Johan, additional, Farina, Ilenia, additional, Ferraro, Alberto, additional, Gálvez-Martos, José-Luis, additional, García-González, Julia, additional, García-Navarro, Justo, additional, Gayarre, Fernando López, additional, Ghisellini, Patrizia, additional, Gholampour, Aliakbar, additional, González, Jesús Suárez, additional, Guerra-Romero, M. Ignacio, additional, Guo, Zhanggen, additional, Hanif, Asad, additional, Hong, W.H., additional, Istrate, Ioan-Robert, additional, Jiang, Tianxun, additional, Jiménez-Rivero, Ana, additional, Juan-Valdés, Andrés, additional, Kareem, Abbaas I., additional, Kim, Young-Chan, additional, Kong, Xiangkun, additional, Koutamanis, Alexander, additional, Lafayette, K.P.V., additional, Manzi, Stefania, additional, Marrero, Madelyn, additional, Marshall, Amelia, additional, Moccia, Ivan, additional, Moon, H.J., additional, Nikraz, Hamid, additional, Ozbakkaloglu, Togay, additional, Pacheco-Torgal, F., additional, Paz, D.H.F., additional, Pérez, Carlos López-Colina, additional, Petrillo, Antonella, additional, Polanco, Juan A., additional, Porras-Amores, César, additional, Pozo, Julia Mª Morán-del, additional, Rivero-Camacho, Cristina, additional, Rodríguez-Robles, Desirée, additional, Sainz-Aja, José A., additional, Sata, Vanchai, additional, Serrano López, Miguel A., additional, Serranti, Silvia, additional, Setién, Jesús, additional, Siddique, Rafat, additional, Sivakugan, Nagaratnam, additional, Šljivić-Ivanović, Marija, additional, Smičiklas, Ivana, additional, Sobral, M.C.M., additional, Solís-Guzmán, Jaime, additional, Sun, Yan, additional, Thomas, C., additional, Tu, An, additional, Tuladhar, Rabin, additional, Ulgiati, Sergio, additional, Villoria-Sáez, Paola, additional, and Zhang, Jing, additional

Published
2020
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38. Electron localization in periodically strained graphene.

Author

Giambastiani, Davide, Colangelo, Francesco, Tredicucci, Alessandro, Roddaro, Stefano, and Pitanti, Alessandro

Subjects
*GRAPHENE, *ELECTRON configuration, *DENSITY of states, *ELECTRONS, *SNAKE venom
Abstract

Pseudo-magnetic field (PMF) in deformed graphene has been proposed as a promising and flexible method to quantum-confine electronic states and create gaps in the local density of states. Motivated by this perspective, we numerically analyze various different configurations leading to electronic localization and band flattening in periodically strained graphene. In particular, we highlight the existence of a fine structure in the pseudo-Landau levels confined in large-PMF regions, the emergence of states confined to PMF nodes as well as of snake-like orbits. In our paper, we further analyze the importance of the relative rotation and asymmetry of the strain lattice with respect to the atomic lattice and show how it can be used to modulate the PMF periodicity and to create localized orbits far from the strain points. Possible implementations and applications of the simulated structures are discussed. [ABSTRACT FROM AUTHOR]

Published
2022
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47. List of contributors

Author

Aghayan, I., primary, Al-Adham, Khaleel, additional, Asgharian Jeddi, Ali Asghar, additional, Bhogayata, Ankur C., additional, Bonifazi, Giuseppe, additional, Calzada-Pérez, Miguel Ángel, additional, Colangelo, Francesco, additional, Dalhat, M.A., additional, Elkordi, A., additional, Farina, Ilenia, additional, Foti, Dora, additional, Habib, M.A., additional, Hama, Sheelan M., additional, Herki, B.A., additional, Hilal, Nahla N., additional, Indacoechea-Vega, I., additional, Jamshidi, Masoud, additional, Kaliyavaradhan, Senthil Kumar, additional, Khafajeh, R., additional, Khatib, J.M., additional, Kocakerim, M.M., additional, Korucu, H., additional, La Marca, Floriana, additional, Lastra-González, Pedro, additional, Ling, Tung-Chai, additional, Lupo, Emanuela, additional, Malkapur, Santhosh M., additional, Masirin, Mohd Idrus Mohd, additional, Memarian, Farnaz, additional, Mohammed, A.A., additional, Moroni, Monica, additional, Narasimhan, Mattur C., additional, Pacheco-Torgal, F., additional, Pakravan, Hamid Reza, additional, Pavlík, Z., additional, Pavlíková, M., additional, Saghafi, Amir Masoud, additional, Sarang, Goutham, additional, Serranti, Silvia, additional, Şimşek, B., additional, Tuladhar, Rabin, additional, Usman, Nura, additional, Uygunoğlu, T., additional, Vila-Cortavitarte, Marta, additional, Yin, Shi, additional, and Záleská, M., additional

Published
2019
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48. Characterization of eco-friendly lightweight aggregate concretes incorporating industrial wastes

Author

Universitat Politècnica de Catalunya. Departament d'Enginyeria Civil i Ambiental, Sadrolodabaee, Payam, Di Rienzo, Gianmarco, Farina, Ilenia, Salzano, Cinzia, Singh, Narinder, Colangelo, Francesco, Universitat Politècnica de Catalunya. Departament d'Enginyeria Civil i Ambiental, Sadrolodabaee, Payam, Di Rienzo, Gianmarco, Farina, Ilenia, Salzano, Cinzia, Singh, Narinder, and Colangelo, Francesco

Abstract

Towards the sustainable development goals in the built environment, the use of waste and recycled sources has been attaining great interest among researchers and policy-makers, especially in concrete as the most used construction material. Excess use of natural aggregates, as one of the main components of concrete, causes the depletion of natural resources and the associated environmental problems, thus, the use of artificial and recycled aggregates is of great importance. In this regard, the production of lightweight artificial aggregates from industrial and hazardous wastes may be a promising solution that not only mitigates the depletion of natural resources but also stabilize those kinds of wastes. This study aimed to investigate the production of concrete with recycled aggregates from industrial wastes, mainly municipal solid waste incineration fly ash (MSWI-FA). To this end, different kinds of mix designs to manufacture the aggregates were developed based on MSWI-FA, ground granulated blast furnace slag (GGBFS), marble sludge (MS), and cement. The concrete samples containing different artificial aggregates, as well as recycled polyethylene terephthalate (PET) in the sand form, were produced and the properties, including compressive strength and thermal insulation, were evaluated. The obtained results of the lightweight concrete demonstrated enhanced thermal property (up to 30%), but at least 30% lower resistance with respect to the normal concrete produced from the natural aggregate., Postprint (author's final draft)

Published
2023

49. Experimental-theoretical comparative analysis of PLA-based 3D lattice.

Author

Singh, Narinder, Gurminder singh, Farina, Ilenia, and Colangelo, Francesco

Subjects
POLYLACTIC acid, FUSED deposition modeling, FRACTURE mechanics, TENSILE tests, YOUNG'S modulus, COMPARATIVE studies
Abstract

Lattice materials are one of the most desirable and widely used materials due to the characteristics derived from their geometrical formation as opposed to their chemical composition. In this article, a lattice material has been designed and printed using polymer filament wire made of polylactic acid (PLA) and fused deposition modelling (FDM), followed by mechanical testing. In addition, tensile testing of the PLA printed samples has also been carried out to ascertain the tensile properties of the material in use, and the material has shown 38–40 MPa tensile strength with a Young's modulus value of 1538 ± 120 MPa. The lattice was designed using 3D CAD software, and numerical results were obtained using the Autodesk Inventor simulation module. In addition to the experimental test, theoretical tests were also conducted, and the results were compared to the experimental results. With this methodology, the lattice material failure process can be comprehended. Along with the lattices, the PLA tensile test samples were also prepared and tested to check the feasibility of the PLA being used and ascertain the properties. In addition, it has been observed that after a specific load and deformation, the material's resistance increases due to its increased density and repeated cell interference. The major purpose of the study is to explore the aspects and feasibility of the PLA printed lattice material with complex shapes and explore the application potential of such shapes. [ABSTRACT FROM AUTHOR]

Published
2023
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