A5052000143- Phase Equilibria and Thermodynamics
- Thermodynamic properties of mixtures
- Chemical Thermodynamics and Molecular Structure
- Lubricants and Their Additives
- Ionic liquids properties and applications
- Rheology and Fluid Dynamics Studies
- Tribology and Wear Analysis
- Gear and Bearing Dynamics Analysis
- Material Dynamics and Properties
- Tribology and Lubrication Engineering
- Refrigeration and Air Conditioning Technologies
- Force Microscopy Techniques and Applications
- Scientific Measurement and Uncertainty Evaluation
- Diamond and Carbon-based Materials Research
- nanoparticles nucleation surface interactions
- Adsorption, diffusion, and thermodynamic properties of materials
- Surfactants and Colloidal Systems
- Adhesion, Friction, and Surface Interactions
- Polymer Foaming and Composites
- Elasticity and Material Modeling
- Plant biochemistry and biosynthesis
- Inorganic and Organometallic Chemistry
- Soil Mechanics and Vehicle Dynamics
- Electrochemical Analysis and Applications
- Nanofluid Flow and Heat Transfer
Universidade de Santiago de Compostela
2014-2024
Centre National de la Recherche Scientifique
2004-2010
Universidade de Vigo
2004-2010
Université Clermont Auvergne
2008
Université de Pau et des Pays de l'Adour
2003-2004
Laboratoire de Dynamique des Fluides
2002-2004
One of the potential applications ionic liquids (ILs) is their use as lubricants or lubricant additives. The choice cation and anion ILs, well side chain design, determine fundamental properties, which permits us to create tailor-made additives among other functional fluids. In this work we have studied 10 ILs for report densities viscosities from 283.15 K (and some at lower temperatures) up 373.15 K. fall in range hydraulic fluid lubricants. Four these were composed by...
New density data for diethyl adipate (DEA) over 12 isotherms [(293.15 ≤ T 403.15) K] and 15 isobars [(0.1 p 140) MPa] are reported. This paper presents also the calibration procedure we propose a new experimental equipment. Data reliability has been verified pressure temperature intervals by comparing our results toluene 1-butanol with previous literature data. A total of 732 points have measured in framework this work. The uncertainty is estimated to be ± 0.5 kg·m−3 (around 0.05 %)....
This study presents new Nano-enhanced Phase Change Materials, NePCMs, formulated as dispersions of functionalized graphene nanoplatelets in a poly(ethylene glycol) with mass-average molecular mass 400 g·mol-1 for possible use Thermal Energy Storage. Morphology, functionalization, purity, and thermal stability the nanomaterial and/or were characterized. Design parameters NePCMs defined on basis temporal nanoplatelet using dynamic light scattering. Influence loading solid-liquid phase change...
In this work, a scaling concept based on relaxation theories of the liquid state was combined with relation previously proposed by authors to provide general framework describing dependency viscosity pressure and temperature. Namely, viscosity−pressure coefficient (∂η/∂p)T expressed in terms state-independent exponent, γ. This factor determined empirically from versus Tvγ curves. New equations for pressure− temperature−viscosity coefficients were derived, which are considerable technological...
Casalini and Roland [Phys. Rev. E 69, 062501 (2004); J. Non-Cryst. Solids 353, 3936 (2007)] other authors have found that both the dielectric relaxation times viscosity, η, of liquids can be expressed solely as functions group (TV (γ)), where T is temperature, V molar volume, γ a state-independent scaling exponent. Here we report exponents γ, for viscosities 46 compounds, including 11 ionic liquids. A generalization this thermodynamic to transport properties, namely, self-diffusion...
New experimental densities are reported for squalane and branched pentaerythritol tetra(2-ethylhexanoate), PEB8, in the compressed liquid state over temperature range from (278.15 to 353.15) K pressures up 45 MPa. The reliability of technique procedure 25 MPa has been verified our previous works, present work they were checked by comparing heptane with literature data. A total 297 density values have measured a high-pressure vibrating tube densimeter. correction factor due sample viscosity...
The paper presents a new reference correlation for the viscosity of squalane at 0.1 MPa. should be valuable as it is first to cover moderately high range, from 3 118 mPa s. It based on measurements carried out this work, well other critically evaluated experimental data literature. valid 273 373 K average absolute percentage deviation fit 0.67, and expanded uncertainty, with coverage factor k = 2, 1.5%.
This paper presents new reference correlations for both the density and viscosity of squalane at high pressure. These are based on critically evaluated experimental data taken from literature. In case density, correlation, Tait equation, is valid 273 to 473 K pressures 200 MPa. At 0.1 MPa, it has an average absolute deviation 0.03%, a bias −0.01%, expanded uncertainty (at 95% confidence level) 0.06%. Over whole range pressures, correlation 0.05%, −0.004%, 0.18%. viscosity, two presented, one...
The experimental measurements of dynamic viscosity for squalane, pentaerythritol tetra-2-ethylhexanoate (PEB8), and tetranonanoate (PEC9) have been performed using a Ruska rolling-ball viscometer over the temperature range 303.15−353.15 K pressure 0.1−60 MPa. A total 2016 rolling time obtained determination 252 data. available literature data squalane at high pressures compared with new measurements, an average deviation 1.5% has obtained, which is within uncertainty (±3%). higher values are...
This research is based on the investigation of tribological properties a biodegradable polymeric ester lubricant (BIOE) additivated with two different pristine graphene nanoplatelets (GnPs), named as GnP7 and GnP40. These GnPs have lateral sizes 7 40 μm, thickness 3 10 nm, respectively. Four nanoadditive loadings: 0.015, 0.035, 0.055 0.075 wt% been used. Stability nanolubricants has investigated using visual control refractive index evolution during time, revealing slightly better stability...
The main motivation of this work is to verify the reliability a high-pressure viscosity measurement technique that was recently installed in our laboratory. A total 2520 experimental measurements rolling time have been performed. Hexane and decane were used calibrate apparatus, dynamic heptane has measured calibration method. Our results agree with literature values average absolute deviations lower than uncertainty (±2%). In second step, hexane, heptane, as reference substances, verified...