A5022487306- Photoacoustic and Ultrasonic Imaging
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Thermography and Photoacoustic Techniques
- Ultrasound Imaging and Elastography
- Optical Coherence Tomography Applications
- Ultrasonics and Acoustic Wave Propagation
- Nanoplatforms for cancer theranostics
- High-pressure geophysics and materials
- Thermal properties of materials
- Advanced Thermoelectric Materials and Devices
- Optical Imaging and Spectroscopy Techniques
- Photodynamic Therapy Research Studies
- Material Dynamics and Properties
- Thermal Radiation and Cooling Technologies
- Ultrasound and Hyperthermia Applications
- Calibration and Measurement Techniques
- Corneal surgery and disorders
- thermodynamics and calorimetric analyses
- Corneal Surgery and Treatments
- Electrowetting and Microfluidic Technologies
- Field-Flow Fractionation Techniques
- Heat Transfer and Boiling Studies
- Calcium Carbonate Crystallization and Inhibition
- Crystallography and molecular interactions
University of Washington
2021-2022
Tufts University
2020-2021
University of Colorado Boulder
2021
University of Bern
2018-2020
Laboratoire d'Acoustique de l'Université du Mans
2019
Centre National de la Recherche Scientifique
2013-2019
Le Mans Université
2016-2019
Université de Lille
2013-2015
Université Lille Nord de France
2013-2015
Université du littoral côte d'opale
2013-2014
Computed ultrasound tomography in echo mode (CUTE) allows determining the spatial distribution of speed-of-sound (SoS) inside tissue using handheld pulse-echo (US). This technique is based on measuring changing phase beamformed echoes obtained under varying transmit (Tx) and/or receive (Rx) steering angles. The SoS reconstructed by inverting a forward model describing how related to shift. Thanks straight-ray approximation, this linear and can be inverted real-time when implemented...
We present the depolarization field effects (Maxwell-Wagner-Sillars effect) for thermal transport properties of polymer dispersed liquid crystal composites under a frequency-dependent electric field. The experiments were conducted on polystyrene/4-Cyano-4${}^{\ensuremath{'}}$-pentylbiphenyl (PS/5CB) PDLCs 73 vol.% and 85 (LC) concentrations. A self-consistent approximation model is used to deduce electrical LC materials as well threshold Electric field-varying (at constant frequency) also...
Abstract Skin broadly protects the human body from undesired factors such as ultraviolet radiation and abrasion helps conserve temperature hydration. Skin’s elasticity its level of anisotropy are key to aesthetics function. Currently, however, treatment success is often speculative subjective, rarely based on skin’s elastic properties because there no fast accurate non-contact method for imaging elasticity. Here we report a non-invasive image characterize anisotropy. It combines acoustic...
Recent advances in nanostructured materials have spurred the development of improved thermoelectric (TE) devices. Performances these systems are strongly linked to their thermal conductivities. Accurate measurement techniques parameters therefore required assess efficiency new materials. In this work, (thermal diffusivity, conductivity, and effusivity) composites based on oxidised or unoxidised carbon nanotubes at 6.6 wt. % mixed with doped nanofibrous polyaniline been measured a novel...
Water ice is a molecular solid whose behavior under compression reveals the interplay of covalent bonding in molecules and forces acting between them. This determines high-pressure phase transitions, elastic plastic ${\mathrm{H}}_{2}\mathrm{O}$ ice, which are properties needed for modeling convection internal structure giant planets moons solar system as well ${\mathrm{H}}_{2}\mathrm{O}$-rich exoplanets. We investigated experimentally theoretically transitions cubic at room temperature high...
Dynamic optical coherence elastography (OCE) tracks mechanical wave propagation in the subsurface region of tissue to image its shear modulus. For bulk waves, lateral resolution reconstructed modulus map (i.e., elastographic resolution) can approach that tomography (OCT), typically a few tens microns. Here we perform comprehensive numerical simulations and acoustic micro-tapping OCE experiments show for typical situation guided bounded media, such as cornea, cannot reach OCT is mainly...
The recently introduced photothermoelectric (PTE) effect is proposed as an alternative for measuring dynamic thermal parameters of solid samples. front PTE configuration, together with the thermal-wave resonator cavity method a scanning procedure, was used to measure value effusivity. back chopping frequency incident radiation parameter, leads direct measurement diffusivity. A theory based on above two detection configurations developed and its application solids, covering large range...
High accuracy, non-contact measuring methods for finding thermal properties of liquid samples using photothermal infrared radiometry (PTR) are presented. The use transparent windows to confine micro volume and the implementation front and/or back signal detection procedures helped successful PTR technique liquids with high proficiency. We present two configurations, so-called back–front find diffusivity effusivity samples. Sensitivity studies error analyses included prove robustness each...
Photodynamic therapy (PDT), a spatially localized phototoxic that involves irradiation of photosensitizer (PS) with specific wavelengths light, has shown exceptional promise in impacting cancer treatment outcomes, particularly oral cancer. To reduce PDT outcome variability, attempts toward image-guided personalized are being pursued by monitoring PS uptake either via fluorescence or photoacoustic imaging (PAI), nonionizing modality dependent on optical absorption properties the tissue....
Single-crystal elastic moduli ${C}_{ij}$, shear modulus $G$, and Zener anisotropic ratio $A$ of solid argon having the face-centered cubic (fcc) structure were determined at high pressures between 12 64 GPa using a combination experimental theoretical approaches. The data, namely, maximal minimal values product longitudinal sound velocity refractive index $n\ifmmode\cdot\else\textperiodcentered\fi{}{V}_{L}$, obtained from 3D scanning inhomogeneities in compressed samples technique...
Photoacoustic (PA) imaging–a technique combining the ability of optical imaging to probe functional properties tissue and deep structural ultrasound–has gained significant popularity in past two decades for its utility several biomedical applications. More recently, light-emitting diodes (LED) are being explored as an alternative bulky expensive laser systems used PA their portability low-cost. Due large beam divergence LEDs compared traditional beams, it is imperative quantify angular...
A new and accurate method for the thermal characterization of thermoelectric liquids is proposed. The experiment based on a self-generated voltage due to Seebeck effect. This provided by sample when one its two faces thermally excited using modulated laser. used tetradodecylammonium nitrate salt/1-octanol mixture, with high coefficient. properties (thermal diffusivity, effusivity, conductivity) are found compared those obtained other photothermal techniques. In addition this, study...
Picosecond acoustic interferometry is used to monitor in time the motion of phase transition boundary between two water ice phases, VII and VI, coexisting at a pressure 2.15 GPa when compressed diamond anvil cell room temperature. By analyzing time-domain Brillouin scattering signals accumulated for single incidence direction probe laser pulses, it possible access ratios sound velocity values refractive indices involved distinguish structural recrystallization process. Two-dimensional...
Handheld imaging of the tissue’s speed-of-sound (SoS) is a promising multimodal addition to diagnostic ultrasonography for examination tissue composition. Computed ultrasound tomography in echo mode (CUTE) probes spatial distribution SoS, conventionally via scanning under varying angle transmission, and quantifying—in spatially resolved way—phase variations beamformed echoes. So far, this technique not applicable lumen vessels, where blood flow clutter inhibit phase tracking With goal enable...
Picosecond laser ultrasonics is an experimental technique for the generation and detection of ultrashort acoustic pulses using ultrafast lasers. In transparent media, it often referred to as time-domain Brillouin scattering (TDBS). It provides opportunity monitor propagation nanometers-length determine acoustical, optical, acousto-optical parameters materials. We report on application TDBS evaluating effect Praseodymium (Pr) substitution elasticity multiferroic (Bi1−xPrx)(Fe0.95Mn0.05)O3...
In this work, we report that gold nanorods coated with hydrophobically-modified mesoporous silica shells not only enhance photoacoustic (PA) signal over unmodified nanorods, but the relationship between PA amplitude and input laser fluence is strongly nonlinear. Mesoporous of ~14 nm thickness ~3 pores were grown on showing near infrared absorption. The was rendered hydrophobic addition dodecyltrichlorosilane, then re-suspended in aqueous media a lipid monolayer. Analysis revealed an...
The recently introduced photothermoelectric (PTE) effect is proposed for investigating the dynamic thermal parameters of condensed matter samples. front detection configuration, together with thermal-wave resonator cavity (TWRC) method as scanning procedure, was used to measure value effusivity. back TWRC technique and/or chopping frequency incident radiation parameter, leads direct measurement diffusivity. Recent applications solid (materials different values parameters) and liquid...
Abstract Skin broadly protects the human body from undesired factors such as ultraviolet radiation and abrasion helps conserve temperature hydration. Skin’s elasticity its level of anisotropy are key to aesthetics function. Currently, however, treatment success is often speculative subjective, rarely based on skin’s elastic properties because there no fast accurate non-contact method for imaging elasticity. Here we report a non-invasive image characterize anisotropy. It combines acoustic...