Category: Materials Science and Technology

Mechanical micro-probing as a versatile technique for the surface engineering: from mapping to patterning (Ph.D. Thesis)

In the last decades, nanoscience and nanotechnology raised their role and impact in industry due to the increasing importance of the analysis and characterization of materials at the nano-scale. In fact, at a such small (10-9 m) scale, materials exhibit properties (such as strength, stiffness, hardness but also electrical resistivity and conductivity or optical absorption) that are significantly different from the properties of the same matter at bulk scale. For this reason, it has been necessary to realize and develop...

“Litografia tramite nanoindentazione per patterning superficiale : effetti locali sull’energia libera superficiale e meccanismi di adesione”

La tematica in oggetto può essere suddivisa in tre fasi di ricerca: 1)        Studio dell’energia libera superficiale di materiali selezionati in funzione dei parametri del patterning superficiale; 2)        Misure locali di energia libera superficiale su micro particelle per applicazioni biomediche; 3)        Effetti di adesione in micro e nano dispositivi (M.E.M.S.). La nano-fabbricazione interessa qualsiasi processo che produce pattern di strutture con dimensioni minori di 100 nanometri in almeno una dimensione. L’electron-beam litography (EBL) e l’incisione tramite Focused ion beam (FIB)...

3D FIB nanolithography using nanomachining technics

  The Focused Ion Beam (FIB)microscopes are extermely versatile and powerful instruments for materials research. It’s a tool to realize sample imaging, sectioning,  ion-lithography and nano/micro machining on surfaces. The art to produce complex shapes at the nanoscales is often limited with the default pattern engine included in the instrument software or you need to buy a very expensive add-in for enlarging the potentiality of your pattern strategy. An alternative way to improve the complexity of your pattern is the ‘stream file’....

Design, development and characterization of stress-optimized Ti-TiN multilayer PVD-coatings

Residual stresses in PVD-coating deteriorate the adhesion of coatings and adversely affect the performance of coated components.  Although it might have positive effects such as resistance to cracking, wear and fatigue failure. A proper control of residual stress is essential for successful coating development. Multilayer system with alternate hard (ceramic) and soft (metallic) layers in comparison with monolayer, offer much more ease: to control residual stresses, improve adhesion, increase overall thickness and produce the toughening response. However, in order to...

Miniaturized piezoelectric sensors integrated into a highly expandable polymeric network.

My research activity is part of a bigger project “Morphing Locally and Globally Structures with Multiscale Intelligence by Mimicking Nature” (MORPHOSIS), funded by European Research Council (ERC Starting Grant 2012) which is related to the realization of intelligent morphing materials by integrating several innovative materials/technologies. Within this framework, my research is related to the realization of miniaturized piezoelectric-based devices and their integration into a highly expandable polymeric network. The research activity goes all the way from the material fabrication to...

Development of integrated methods, based on nanoindentation and Focused Ion Beam (FIB), for space resolved mechanical characterization

My work has contributed to the development of a procedure for the proper evaluation of mechanical maps in multi-phase materials, publication. This activity was published as “Mechanical property measurements of heterogeneous materials by selective nanoindentation: Application to LiMn2O4 cathode” (Materials Science & Engineering A 593 (2014) 92–102) The purchase of a new head of the nanoindenter has given the opportunity to further implement the development of the technique for the mapping of the elastic modulus and hardness, by the use...