IMT Institutional Repository: No conditions. Results ordered -Date Deposited. 2024-03-28T10:09:27ZEPrintshttp://eprints.imtlucca.it/images/logowhite.pnghttp://eprints.imtlucca.it/2018-03-28T13:09:05Z2018-03-28T13:09:05Zhttp://eprints.imtlucca.it/id/eprint/4062This item is in the repository with the URL: http://eprints.imtlucca.it/id/eprint/40622018-03-28T13:09:05ZInkjet printed 2D-crystal based strain gauges on paperWe present an investigation of inkjet printed strain gauges based on two-dimensional (2D) materials. The technology leverages water-based and biocompatible inks to fabricate strain measurement devices on flexible substrates such as paper. We demonstrate that the device performance and sensitivity are strongly dependent on the printing parameter (i.e., drop-spacing, number of printing passes, etc.). We show that values of the Gauge Factor up to 125 can be obtained, with large sensitivity (>20) even when small strains (0.3) are applied. Furthermore, we provide preliminary examples of heterostructure-based strain sensors, enabled by the inkjet printing technology.C. CasiraghiM. MacucciK. ParvezR. WorsleyY. ShinF. BronteClaudia Borriclaudia.borri@imtlucca.itMarco Paggimarco.paggi@imtlucca.itG. Fiori2017-09-29T09:27:58Z2017-09-29T09:27:58Zhttp://eprints.imtlucca.it/id/eprint/3816This item is in the repository with the URL: http://eprints.imtlucca.it/id/eprint/38162017-09-29T09:27:58Z(a cura di) Atti del Convegno GIMC-GMA 2016Marco Paggimarco.paggi@imtlucca.itAndrea Bacigalupoandrea.bacigalupo@imtlucca.itStefano BennatiClaudia Borriclaudia.borri@imtlucca.itMauro Corradomauro.corrado@polito.itAndrea GizziPaolo Sebastiano Valvo2017-09-29T09:03:06Z2017-09-29T09:03:06Zhttp://eprints.imtlucca.it/id/eprint/3817This item is in the repository with the URL: http://eprints.imtlucca.it/id/eprint/38172017-09-29T09:03:06ZPercolation properties of the free volume generated by two rough surfaces in contactThe mechanism of fluid leakage trough the free volume between rough surfaces in
contact is relevant in physics and in many engineering applications. In the present study, the
normal contact problem between randomly generated fractal rough surfaces is solved using the
boundary element method. Then, an algorithm for the evaluation of the network involved in
the percolation of fluid is proposed. Numerical results are synthetically collected in diagrams
relating the free volume involved in the percolation to the dimensionless statistical parameters
of the rough surfacePaolo Cinatpaolo.cinat@imtlucca.itMarco Paggimarco.paggi@imtlucca.itClaudia Borriclaudia.borri@imtlucca.it2017-09-29T09:00:45Z2017-09-29T09:00:45Zhttp://eprints.imtlucca.it/id/eprint/3818This item is in the repository with the URL: http://eprints.imtlucca.it/id/eprint/38182017-09-29T09:00:45ZSimulazione numerica e confronto con misure sperimentali del processo di raffreddamento di barriere termiche.Claudia Borriclaudia.borri@imtlucca.itAlessio FossatiAlessandro LavacchiTiberio BacciUgo Bardi2017-09-29T08:56:06Z2017-09-29T08:56:06Zhttp://eprints.imtlucca.it/id/eprint/3819This item is in the repository with the URL: http://eprints.imtlucca.it/id/eprint/38192017-09-29T08:56:06ZNet energy return (EROEI) of Thermal Barrier Coatings in turbine enginesClaudia Borriclaudia.borri@imtlucca.itUgo BardiCarlo GiolliAndrea GiorgettiS. MeneghettiJ. NocivelliA. Scrivani2017-09-29T08:54:43Z2017-09-29T08:54:43Zhttp://eprints.imtlucca.it/id/eprint/3820This item is in the repository with the URL: http://eprints.imtlucca.it/id/eprint/38202017-09-29T08:54:43ZCurrent Density Simulations in the Electrodeposition from Ionic Liquids: Effects of the Conductivity.The overall goal of this work is the
use of COMSOL Multiphysics in the modelling
of the current density distributions for the
electrodeposition of Aluminium coatings from
Ionic Liquids. The local current distribution is
strongly dependant on the conductivity and on
the geometry of the galvanic cell and can only be
performed by the numerical solution of the
PDE’s governing the system. The ability to
predict the local current density on an electrode
is crucial to eventually evidence portions where
the deposition may be invalidate.I. PerissiClaudia Borriclaudia.borri@imtlucca.itStefano CaporaliAlessandro Lavacchi2017-09-29T08:52:40Z2017-09-29T08:52:40Zhttp://eprints.imtlucca.it/id/eprint/3821This item is in the repository with the URL: http://eprints.imtlucca.it/id/eprint/38212017-09-29T08:52:40ZFinite element analysis of thermal fatigue in thermal barrier coatings (TBC)A Finite element model of plasma sprayed
TBC’s was developed to estimate the stress
induced by thermal cycling experiments. A heat
transfer analysis was performed to evaluate the
temperature distribution on the specimen during the cooling under an impinging air jet; temperature measurements performed with an infrared pyrometer on the cooled samples show good agreement with the evaluated data. These results were then integrated in a structural
mechanic model as thermal load. The COMSOL Multiphysics® Thermal-Structural interaction model allowed to determine the dependence of the stress on the temperature fieldsClaudia Borriclaudia.borri@imtlucca.itAlessandro LavacchiAlessio FossatiIlaria PerissiUgo Bardi2017-09-28T15:30:32Z2017-09-28T15:30:32Zhttp://eprints.imtlucca.it/id/eprint/3812This item is in the repository with the URL: http://eprints.imtlucca.it/id/eprint/38122017-09-28T15:30:32ZTopology simulation and contact mechanics of bifractal rough surfaces*A numerical method to generate bifractal surfaces due to a modification of the slope of the power spectral density function in the low- or high-frequency range is proposed. The method has been applied to simulate real surfaces of Ginkgo Biloba leaf scanned at two different magnifications by matching the corresponding experimental power spectral densities. Slight differences have been found in the statistical distributions of the asperity heights and curvatures for the lowest magnification that had marginal influence on the frictionless normal contact response of the surface. For highest magnification, however, the statistics of the simulated numerical surface were quite different from those of the real one, leading also to a significant difference in the normal contact results.Claudia Borriclaudia.borri@imtlucca.itMarco Paggimarco.paggi@imtlucca.it2017-09-28T15:29:25Z2017-09-28T15:29:25Zhttp://eprints.imtlucca.it/id/eprint/3813This item is in the repository with the URL: http://eprints.imtlucca.it/id/eprint/38132017-09-28T15:29:25ZA two-scale constitutive parameters identification procedure for elasto-plastic fractureConstitutive parameters identification for elasto-plastic fracture is a complex problem due to the interplay between two forms of material nonlinearity, viz. plasticity and cohesive fracture. In the present study we examine this problem in relation to Copper specimens covered by Silver used in photovoltaic modules as electrical conductors. Uniaxial tensile tests on un-notched and notched specimens are performed with a tensile stage inside a scanning electron microscope, monitoring crack growth for each imposed far-field displacement. Parameters identification is then performed by considering an elasto-plastic constitutive relation with isotropic hardening for the continuum and a polynomial cohesive zone model (CZM) with two free parameters. For a better numerical-experimental fitting, a four-parameter CZM should be used to independently control the CZM stiffness and the fracture energy. To do so effectively, a constrained optimization procedure with a two-scale objective function is outlined.Valerio Carollovalerio.carollo@imtlucca.itClaudia Borriclaudia.borri@imtlucca.itMarco Paggimarco.paggi@imtlucca.it2017-09-28T06:29:05Z2017-09-28T06:29:05Zhttp://eprints.imtlucca.it/id/eprint/3811This item is in the repository with the URL: http://eprints.imtlucca.it/id/eprint/38112017-09-28T06:29:05ZEvolution of fatigue damage in flexible photovoltaic modulesClaudia Borriclaudia.borri@imtlucca.itMariacristina Gagliardimariacristina.gagliardi@imtlucca.itMarco Paggimarco.paggi@imtlucca.it2016-12-27T09:12:15Z2016-12-27T09:12:15Zhttp://eprints.imtlucca.it/id/eprint/3616This item is in the repository with the URL: http://eprints.imtlucca.it/id/eprint/36162016-12-27T09:12:15ZAdhesive behaviour of bonded paper layers: Mechanical testing and statistical modellingIn this study, an experimental methodology based on micromechanical testing inside a scanning electron microscope is proposed to characterise bonding of paper layers connected by wet pressing. The peeling force–displacement evolution law that characterises the delamination of micromechanical double cantilever beam specimens of paper tissue have been extracted from such peeling tests. It is observed that the force–displacement evolution curve achieves a steady-state value related to the effective adhesive energy of the interface. This behaviour is explained by examining the complex load transfer mechanism between the layers exerted by cellulose fibrils. A statistical approach is used for the computation of the effective adhesive energy. It is argued that the observed force–displacement evolution law may be satisfactory described by a stochastic model that depends on the distribution function of the fibrils strength, and on two geometrical distribution functions related to the in-plane and out-of-plane fibrils angles with respect to the undeformed interface configuration. Some applications of the proposed model are demonstrated on examples.Claudia Borriclaudia.borri@imtlucca.itMarco Paggimarco.paggi@imtlucca.itJosé ReinosoFeodor M Borodich2016-11-23T09:04:15Z2017-11-29T13:22:13Zhttp://eprints.imtlucca.it/id/eprint/3600This item is in the repository with the URL: http://eprints.imtlucca.it/id/eprint/36002016-11-23T09:04:15ZPolymer Nanoparticles as Smart Carriers for the Enhanced Release of Therapeutic Agents to the CNSBackground: The brain is the most protected organ in the human body; its protective shield, relying on a complex system of cells, proteins and transporters, prevents potentially harmful substances from entering the brain from the bloodstream but, on the other hand, it also stops drugs administered via the systemic route. To improve the efficacy of pharmacological treatments, targeted drug delivery by means of polymer nanoparticles is a challenging but, at the same time, efficient strategy.
Methods: Thanks to a highly multidisciplinary approach, several ways to overcome the brain protection have provided effective solutions to treat a large number of diseases. Important advances in polymer science, together with the development of novel techniques for nanocarrier preparation, and the discovery of novel targeting ligands and molecules, allow a fine-tuning of size, shape, chemicophysical properties and surface chemistry of functional particulate systems; it enables the improvement of the therapeutic performances for several drugs, also toward districts that are difficult to be treated, such as the brain.
Conclusion: This review focuses on the great strides made from scientists and doctors in the development of polymer nano-sized drug delivery systems for brain diseases. Even though the optimal nanocarrier was not yet discovered, important advances were made to strive for safer, performant and successful systems, with the expectation to find soon better solutions to cure some still untreatable pathologies.Mariacristina Gagliardimariacristina.gagliardi@imtlucca.itClaudia Borriclaudia.borri@imtlucca.it2015-11-02T14:37:29Z2017-03-27T14:28:03Zhttp://eprints.imtlucca.it/id/eprint/2802This item is in the repository with the URL: http://eprints.imtlucca.it/id/eprint/28022015-11-02T14:37:29ZTopological characterization of antireflective and hydrophobic rough surfaces: are random process theory and fractal modeling applicable?The random process theory (RPT) has been widely applied to predict the joint probability distribution functions (PDFs) of asperity heights and curvatures of rough surfaces. A check of the predictions of RPT against the actual statistics of numerically generated random fractal surfaces and of real rough surfaces has been only partially undertaken. The present experimental and numerical study provides a deep critical comparison on this matter, providing some insight into the capabilities and limitations in applying RPT and fractal modeling to antireflective and hydrophobic rough surfaces, two important types of textured surfaces. A multi-resolution experimental campaign using a confocal profilometer with different lenses is carried out and a comprehensive software for the statistical description of rough surfaces is developed. It is found that the topology of the analyzed textured surfaces cannot be fully described according to RPT and fractal modeling. The following complexities emerge: ( i ) the presence of cut-offs or bi-fractality in the power-law power-spectral density (PSD) functions; ( ii ) a more pronounced shift of the PSD by changing resolution as compared to what was expected from fractal modeling; ( iii ) inaccuracy of the RPT in describing the joint PDFs of asperity heights and curvatures of textured surfaces; ( iv ) lack of resolution-invariance of joint PDFs of textured surfaces in case of special surface treatments, not accounted for by fractal modeling.Claudia Borriclaudia.borri@imtlucca.itMarco Paggimarco.paggi@imtlucca.it2014-03-03T14:22:13Z2014-03-03T14:22:13Zhttp://eprints.imtlucca.it/id/eprint/2171This item is in the repository with the URL: http://eprints.imtlucca.it/id/eprint/21712014-03-03T14:22:13ZSeparation of particles from suspensions using transverse force field: a mass transport analysisWe report the calculation of the efficiency for particle separation processes occurring in suspension under transverse force field in a circular duct. The calculation has been performed for a laminar fluid flow directed toward the duct vertical axis. The force field acting on the suspended particles only, is orthogonal to the duct. In the dimensionless calculations occurs a dimensionless group, Ca, which provides a tool for the dimensioning of the purification section.Alessandro LavacchiUgo BardiClaudia Borriclaudia.borri@imtlucca.itM. OrfeiAlexander Tolstogouzov2014-03-03T14:13:47Z2014-03-03T14:17:25Zhttp://eprints.imtlucca.it/id/eprint/2169This item is in the repository with the URL: http://eprints.imtlucca.it/id/eprint/21692014-03-03T14:13:47ZPurification of liquid indium by electric current-induced impurity migration in a static transverse magnetic field We have developed an original method for indium purification. Our approach is based on the directional transfer of impurities by applying crossed electric and magnetic fields to the melting volume. The method reduced the concentration of nickel and tin by a factor of 10 while copper was reduced by a factor of 3. A simple hydrodynamic mass transport model describing the process was also derived.Ugo BardiClaudia Borriclaudia.borri@imtlucca.itAlessandro LavacchiAlexander TolstogouzovE.B. TruninO.E Trunina2014-03-03T14:05:58Z2014-03-03T14:05:58Zhttp://eprints.imtlucca.it/id/eprint/2168This item is in the repository with the URL: http://eprints.imtlucca.it/id/eprint/21682014-03-03T14:05:58ZIsothermal oxidation resistance comparison between air plasma sprayed, vacuum plasma sprayed and high velocity oxygen fuel sprayed CoNiCrAlY bond coats Commercial CoNiCrAlY powders with the same chemical composition were sprayed by vacuum plasma spraying (VPS), air plasma spraying (APS) and high velocity oxygen fuel (HVOF) onto Hastelloy X superalloy substrates obtaining coatings of comparable thickness. After coating, samples were maintained at 1273 K in air for different periods up to 3000 h. Morphological, microstructural and compositional analyses were performed in order to assess the high temperature oxidation resistance provided by the different spraying systems. HVOF technique provided bond coats with higher oxidation resistance compared to APS and VPS.Martina Di FerdinandoAlessio FossatiAlessandro LavacchiUgo BardiFrancesca BorgioliClaudia Borriclaudia.borri@imtlucca.itCarlo GiolliAndrea Scrivani2014-03-03T13:54:01Z2014-03-03T13:54:01Zhttp://eprints.imtlucca.it/id/eprint/2167This item is in the repository with the URL: http://eprints.imtlucca.it/id/eprint/21672014-03-03T13:54:01ZPolyfunctional recognition of pyridinedicarboxylate anions with macrocyclic polyamine receptors containing heteroaromatic groupsThe interaction of the biologically relevant anions deriving from the six pyridinedicarboxylic acids (H2PDC) with two macrocyclic receptors containing a pentamine chain and a bipyridine (1) or a phenanthroline (2) moiety, as well as with the aliphatic analogue 21aneN7 (3), was studied by means of spectroscopic methods (UV−vis, NMR) and potentiometric titrations affording the stability constants of the adducts formed. All three receptors form stable complexes with the substrates thanks to the formation of several salt bridges and hydrogen bond contacts, as observed in the crystal structure of the H83(2,6-PDC)4·H2O·0.5EtOH solid compound. Additional π-stacking interactions between the aromatic moieties of substrates and receptors enhance the stability of complexes with 1 and 2. Compounds 1 and 2 show a marked selectivity toward 2,6- pyridinedicarboxylate anions. In particular, 1 is able to perform a very efficient recognition of these species in the presence of 2 and 3. Molecular modeling calculations suggested that such recognition ability of 1 can be ascribed to a superior structural and electrostatic complementarity with the substrate compared to 2 and 3. Carla BazzicalupiAndrea BenciniAntonio BianchiClaudia Borriclaudia.borri@imtlucca.itAndrea DanesiEnrique Garcia-EspañaClaudia GiorgiBarbara Valtancoli2014-03-03T13:05:06Z2014-03-03T14:07:02Zhttp://eprints.imtlucca.it/id/eprint/2165This item is in the repository with the URL: http://eprints.imtlucca.it/id/eprint/21652014-03-03T13:05:06ZCyclic voltammetry simulation at microelectrode arrays with COMSOL MultiphysicsThe present paper reports the results obtained applying the general purpose software COMSOL Multiphysics® to the finite elements simulation of Cyclic Voltammetries (CV’s) at microelectrodes arrays (MEA). CV’s at inlaid micro disk electrode arrays have been simulated benchmarking our results with those obtained by Compton with the finite difference method. Then the influence of meshing on the quality of the simulated data have been investigated showing that bad meshing may provide shapes with no physical meaning. Simulations have also been performed on recessed micro disk arrays in order to show the effect of the depth of the recess on the voltammetric wave shape. We found that COMSOL Multiphysics® provides a flexible and straightforward route to the simulation of electrochemical systems with complex geometry.Alessandro LavacchiUgo BardiClaudia Borriclaudia.borri@imtlucca.itStefano CaporaliAlessio FossatiI. Perissi