A5067893714- Force Microscopy Techniques and Applications
- Acoustic Wave Resonator Technologies
- Ultrasonics and Acoustic Wave Propagation
- Acoustic Wave Phenomena Research
- Mechanical and Optical Resonators
- Ultrasound and Cavitation Phenomena
- Ultrasound and Hyperthermia Applications
- Photoacoustic and Ultrasonic Imaging
- Integrated Circuits and Semiconductor Failure Analysis
- Underwater Acoustics Research
- Near-Field Optical Microscopy
- Thermography and Photoacoustic Techniques
- Theoretical and Computational Physics
- Material Dynamics and Properties
- Material Properties and Applications
- High-pressure geophysics and materials
- Optical and Acousto-Optic Technologies
- Quantum optics and atomic interactions
- Diamond and Carbon-based Materials Research
- Blood properties and coagulation
- Photonic Crystals and Applications
- Advanced MEMS and NEMS Technologies
- Nonlinear Dynamics and Pattern Formation
- Lipid Membrane Structure and Behavior
- Liquid Crystal Research Advancements
Sapienza University of Rome
2009-2023
University of Žilina
2008
Istituto Nazionale per la Fisica della Materia
2004-2006
Institute of Acoustics and Sensors "Orso Mario Corbino"
1991-2003
Institute of Radio-Engineering and Electronics
1992
Institute for Energetics and Interphases
1989
Abstract In this multimethodological study, microstructural observations of fault rocks are combined with micromechanical property analyses (contact resonance atomic force microscopy (CR‐AFM)) and rotary friction experiments (Slow‐ to High‐Velocity rotary‐shear Apparatus apparatus) find evidence seismic aseismic slip understand the nanoscale rheology clay‐bearing, carbonate‐hosted faults. Fluidized structures, truncated clasts, pores vesicles, phyllosilicate nanosized spherules tubes suggest...
Atomic force acoustic microscopy (AFAM) is a dynamical AFM-based technique very promising for nondestructive analysis of local elastic properties materials. AFAM represents powerful investigation tool in order to retrieve quantitative evaluations the mechanical parameters, even at nanoscale. The determination by strongly influenced number experimental parameters that, present, are not fully under control. One such issues that evaluation require knowledge tip geometry effectively contacting...
By measuring fracton mode displacements in artificial piezoelectric composities with hierarchical structure, we find direct evidence of their localized and self-similar character. Clear indications the existence multiple phonon regimes are also presented.
Two contact resonance frequencies atomic force acoustic microscopy imaging technique has been used to evaluate local indentation modulus of a diamondlike carbon film deposited on molybdenum foil by laser ablation from glassy target. Acoustic images were obtained measuring both first and second frequency at each point the scanned area, then numerically evaluating stiffness reconstructing an bidimensional pattern. The wide difference values allows detect presence residual agglomerates in film.
An atomic force microscopy (AFM) based technique is proposed for the characterization of both indentation modulus and hardness compliant materials. A standard AFM tip used as an indenter to record versus curves analogous those obtained in tests. In order overcome lack information about apex geometry, requires calibration using a set reference samples whose mechanical properties have been previously characterized by means independent technique, such indentation. Due selected samples, has...
Mode conversion is an important feature of wave propagation used in ultrasonic nondestructive testing with Lamb waves. When a packet given central frequency, and correspondent wavenumber, impinges on the free edge plate, reflected generally weighed combination all possible modes compatible frequency. Under particular conditions, only one distinct wavenumber compared to incident one. In such case, according Snell's law, reflection angle different from (anomalous reflection). this article,...
We present an extensive investigation of the normal modes vibration a prototype hierarchical continuous system, consisting Cantor-like sequence piezoelectric and resin elements. From detailed analysis density states, displacement profiles, eigenvalue-spacing distributions, evidence is found for existence multiple fracton phonon regimes. The role resonant effect disorder, which may be primary importance in real systems, are also discussed detail.
Abstract The thermoacoustic effect of isolated single‐wall carbon nanotubes aligned between electrodes is experimentally observed for the first time by imaging emitted acoustic wave using an atomic force microscopy‐based technique specifically developed task. capability such a single‐point measurements verified on layers with two injecting alternate electric current. then demonstrated to allow acquisition, simultaneously topography, images reflecting pressure at fixed distance from sample....
We show experimental evidence of extremely low thresholds for subharmonic generation ultrasonic waves in one-dimensional artifical piezoelectric plates with Cantor-like structure, as compared to the corresponding homogeneous and periodical plates. The origin this apparent anomaly is theoretically investigated by studying anharmonic coupling between normal modes. demonstrate that large enhancement nonlinear interaction results from more favorable frequency spatial matching coupled modes...
The quality and health safety of water used for refrigeration flushing the handpieces, water-syringes other components dental units is considerable importance. Water crosses these devices by a system intersected small plastic tubes (about 2 mm diameter), named unit lines (DUWLs). DUWLs may be heavily colonized many bacterial species in planktonic phase, adherent or biofilm lifestyle, resulting potential risk infection, not only all professionals who routinely use devices, but also...
Experimental evidence is given for the unnoticeable time delay undergone by an acoustic Lamb wave pulse in penetrating a forbidden barrier, represented narrowed plate region propagation path. Measurements, which use technique unique to waves overcoming typical objections made packet experiments, have been performed various aluminium plates several frequencies and different barrier lengths show value of traversal close zero that appears be independent from length.
Electrostatic tip-sample interactions currently represent the main limitation to accurate quantitative analysis of magnetic force microscopy (MFM) data. Controlled magnetization MFM (CM-MFM) represents a smart solution overcome this as it allows one identify electrostatic artifacts and subtract them from standard images, thus enabling investigation properties materials at nanometer scale. CM-MFM, however, requires not only magnetization, but also in situ demagnetization probe. In particular,...
Ultrasound contrast agents are used in echographic imaging techniques to enhance image contrast. In addition, they may represent an interesting solution the problem of non-invasive temperature monitoring inside human body, based on some thermal variations their physical properties. Contrast agents, indeed, inserted into blood circulation and reach most important organs body; consequently, any thermometric property that possess, could be exploited for realizing a thermometer. They essentially...
Near and far fields of a particular ${(S}_{1})$ Lamb mode, generated on steel plate by means wedge transducer, are investigated. These show an oscillating behavior the radial profile acoustic field amplitude that can be interpreted modelled as interference phenomenon between forward backward propagating parts simultaneously at interface transducer plate.