Results overview: Found 22 records in 0.02 seconds.
Articles, 19 records found
Books and collections, 1 records found
Research literature, 2 records found
Articles 19 records found  1 - 10next  jump to record:
1.
6 p, 1.6 MB A novel contactless technique for thermal field mapping and thermal conductivity determination : two-laser Raman thermometry / Reparaz, Juan Sebastian (Institut Català de Nanociència i Nanotecnologia) ; Chavez-Angel, Emigdio (Universitat Autònoma de Barcelona. Departament de Física) ; Wagner, Markus R. (Institut Català de Nanociència i Nanotecnologia) ; Graczykowski, Bartlomiej (Institut Català de Nanociència i Nanotecnologia) ; Gomis-Bresco, Jordi (Institut Català de Nanociència i Nanotecnologia) ; Alzina, Francesc (Institut Català de Nanociència i Nanotecnologia) ; Sotomayor Torres, Clivia M. (Institut Català de Nanociència i Nanotecnologia)
We present a novel contactless technique for thermal conductivity determination and thermal field mapping based on creating a thermal distribution of phonons using a heating laser, while a second laser probes the local temperature through the spectral position of a Raman active mode. [...]
2014 - 10.1063/1.4867166
Review of Scientific Instruments, Vol. 85, issue 3 (March 2014) , art. 34901  
2.
13 p, 281.1 KB Modification of Akhieser mechanism in Si nanomembranes and thermal conductivity dependence of the Q-factor of high frequency nanoresonators / Chavez-Angel, Emigdio (Universitat Autònoma de Barcelona. Departament de Física) ; Zarate, R.A. (Universidad Católica del Norte. Departamento de Física) ; Gomis-Bresco, Jordi (Institut Català de Nanociència i Nanotecnologia) ; Alzina, Francesc (Institut Català de Nanociència i Nanotecnologia) ; Sotomayor Torres, Clivia M. (Institut Català de Nanociència i Nanotecnologia)
We present and validate a reformulated Akhieser model that takes into account the reduction of thermal conductivity due to the impact of boundary scattering on the thermal phonons' lifetime. We consider silicon nanomembranes with mechanical mode frequencies in the GHz range as textbook examples of nanoresonators. [...]
2014 - 10.1088/0268-1242/29/12/124010
Semiconductor Science and Technology, Vol. 29, issue 12 (Dec. 2014) , art. 124010  
3.
16 p, 190.5 KB Synthesis and optical characterization of Er-doped bismuth titanate nanoparticles grown by sol-gel hydrothermal method / Fuentes, Sandra (Centro para el Desarrollo de la Nanociencia y la Nanotecnología (Chile)) ; Muñoz, Pamela (Universidad Católica del Norte) ; Llanos, Jaime (Universidad Católica del Norte) ; Vega, Mauricio (Universidad Católica del Norte) ; Martin, Inocencio R. (Universidad de La Laguna) ; Chávez Ángel, Emigdio (Institut Català de Nanociència i Nanotecnologia)
The Er-doped bismuth titanate (BiTiO, BIT) nanoparticles were synthesized by a combined sol-gel and hydrothermal method under a partial oxygen pressure of 30 bar. The composition and morphology were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and Raman scattering. [...]
2017 - 10.1016/j.ceramint.2016.11.200
Ceramics international, Vol. 43, Issue 4 (March 2017) , p. 3623-3630  
4.
7 p, 2.1 MB Enhanced thermoelectric properties of lightly Nb doped SrTiO3 thin films / Bhansali, Sweta (Institut Català de Nanociència i Nanotecnologia) ; Khunsin, Worawut (Institut Català de Nanociència i Nanotecnologia) ; Chatterjee, Arindom (Institut Català de Nanociència i Nanotecnologia) ; Santiso, José (Institut Català de Nanociència i Nanotecnologia) ; Abad, B. (Instituto de Microelectrónica de Madrid) ; Martín González, Marisol (Instituto de Microelectrónica de Madrid) ; Jakob, G. (Johannes Gutenberg-Universität Mainz. Institut für Physik) ; Sotomayor Torres, Clivia M. (Institut Català de Nanociència i Nanotecnologia) ; Chávez Ángel, Emigdio (Institut Català de Nanociència i Nanotecnologia)
Novel thermoelectric materials developed for operation at room temperature must have similar or better performance along with being as ecofriendly as those commercially used, e. g. , BiTe, in terms of their toxicity and cost. [...]
2019 - 10.1039/c9na00361d
Nanoscale advances, Vol. 1, Issue 9 (September 2019) , p. 3647-3653  
5.
33 p, 1.2 MB 2D Phononic Crystals : Progress and Prospects in Hypersound and Thermal Transport Engineering / Sledzinska, Marianna (Institut Català de Nanociència i Nanotecnologia) ; Graczykowski, Bartlomiej (Max Planck Institute for Polymer Research) ; Maire, Jeremie (Institut Català de Nanociència i Nanotecnologia) ; Chávez Ángel, Emigdio (Institut Català de Nanociència i Nanotecnologia) ; Sotomayor Torres, Clivia M. (Institut Català de Nanociència i Nanotecnologia) ; Alzina, Francesc (Institut Català de Nanociència i Nanotecnologia)
The central concept in phononics is the tuning of the phonon dispersion relation, or phonon engineering, which provides a means of controlling related properties such as group velocity or phonon interactions and, therefore, phonon propagation, in a wide range of frequencies depending on the geometries and sizes of the materials. [...]
2020 - 10.1002/adfm.201904434
Advanced functional materials, Vol. 30, Issue 8 (February 2020) , art. 1904434  
6.
11 p, 3.2 MB From thermal to electroactive graphene nanofluids / Rueda García, Daniel (Institut Català de Nanociència i Nanotecnologia) ; Rodríguez Laguna, María del Rocío (Institut Català de Nanociència i Nanotecnologia) ; Chávez Ángel, Emigdio (Institut Català de Nanociència i Nanotecnologia) ; Dubal, Deepak P. (Institut Català de Nanociència i Nanotecnologia) ; Cabán Huertas, Zahilia (Institut Català de Nanociència i Nanotecnologia) ; Benages Vilau, Raúl (Institut Català de Nanociència i Nanotecnologia) ; Gómez Romero, Pedro 1959- (Institut Català de Nanociència i Nanotecnologia)
Here, we describe selected work on the development and study of nanofluids based on graphene and reduced graphene oxide both in aqueous and organic electrolytes. A thorough study of thermal properties of graphene in amide organic solvents (N,N-dimethylformamide, N,N-dimethylacetamide, and N-methyl-2-pyrrolidone) showed a substantial increase of thermal conductivity and specific heat upon graphene integration in those solvents. [...]
2019 - 10.3390/en12234545
Energies, Vol. 12, Issue 23 (December 2019) , art. 4545  
7.
Development of low-melting point molten salts and detection of solid-to-liquid transitions by alternative techniques to DSC / Rodríguez Laguna, María del Rocío (Institut Català de Nanociència i Nanotecnologia) ; Gómez Romero, Pedro 1959- (Institut Català de Nanociència i Nanotecnologia) ; Sotomayor Torres, Clivia M. (Institut Català de Nanociència i Nanotecnologia) ; Lu, Ming-Chang (National Taiwan University. Department of Mechanical Engineering) ; Chávez Ángel, Emigdio (Institut Català de Nanociència i Nanotecnologia)
The 'Solar salt' (60% NaNO-40% KNO, wt. %) is the most used heat transfer and storage material in high temperature CSP systems. The main drawback is its high melting temperature of 228 °C, which requires extra-energy to keep it in the liquid state and avoid damage to pipes at low temperatures. [...]
2019 - 10.1016/j.solmat.2019.110107
Solar energy materials and solar cells, Vol. 202 (November 2019) , art. 110107  
8.
36 p, 2.1 MB Subamorphous thermal conductivity of crystalline half-Heusler superlattices / Chávez Ángel, Emigdio (Johannes Gutenberg-Universität Mainz. Institut für Physik) ; Reuter, N. (Johannes Gutenberg-Universität Mainz. Institut für Physik) ; Komar, P. (Johannes Gutenberg-Universität Mainz. Institut für Physik) ; Heinz, S. (Johannes Gutenberg-Universität Mainz. Institut für Physik) ; Kolb, U. (Johannes Gutenberg-Universität Mainz. Institut für anorganische und analytische Chemie) ; Kleebe, H.J. (Technische Universität Darmstadt. Institut für Angewandte Geowissenschaften) ; Jakob, G. (Johannes Gutenberg-Universität Mainz. Institut für Physik)
The quest to improve the thermoelectric figure of merit has mainly followed the roadmap of lowering the thermal conductivity while keeping unaltered the power factor of the material. Ideally an electron-crystal phonon-glass system is desired. [...]
2019 - 10.1080/15567265.2018.1505987
Nanoscale and microscale thermophysical engineering, Vol. 23, issue 1 (August 2019) , p. 1-9  
9.
20 p, 7.8 MB Nanowire forest of pnictogen-chalcogenide alloys for thermoelectricity / Singhal, Dhruv (Université Grenoble Alpes) ; Paterson, Jessy (Université Grenoble Alpes) ; Ben-Khedim, Meriam (Technology RandD. STMicroelectronics) ; Tainoff, Dimitri (Université Grenoble Alpes) ; Cagnon, Laurent (Université Grenoble Alpes) ; Richard, Jacques (Université Grenoble Alpes) ; Chávez Ángel, Emigdio (Institut Català de Nanociència i Nanotecnologia) ; Jaramillo Fernández, Juliana (Institut Català de Nanociència i Nanotecnologia) ; Sotomayor Torres, Clivia M. (Institut Català de Nanociència i Nanotecnologia) ; Lacroix, David (Université de Lorraine. Centre national de la recherche scientifique) ; Bourgault, Daniel (Université Grenoble Alpes) ; Buttard, Denis (Université Grenoble Alpes) ; Bourgeois, Olivier (Université Grenoble Alpes)
Pnictogen and chalcogenide compounds have been seen as high-potential materials for efficient thermoelectric conversion over the past few decades. It is also known that with nanostructuration, the physical properties of these pnictogen-chalcogenide compounds can be further enhanced towards a more efficient heat conversion. [...]
2019 - 10.1039/c9nr01566c
Nanoscale, Vol. 11, Issue 28 (July 2019) , p. 13423-13430  
10.
18 p, 1.1 MB Self-sustained coherent phonon generation in optomechanical cavities / Navarro Urrios, Daniel (Institut Català de Nanociència i Nanotecnologia) ; Gomis Bresco, Jordi (Institut Català de Nanociència i Nanotecnologia) ; Alzina, Francesc (Institut Català de Nanociència i Nanotecnologia) ; Capuj, N.E. (Universidad de la Laguna) ; García Fernández, Pedro David (Institut Català de Nanociència i Nanotecnologia) ; Colombano Sosa, Martín (Institut Català de Nanociència i Nanotecnologia) ; Chávez Ángel, Emigdio (Institut Català de Nanociència i Nanotecnologia) ; Sotomayor Torres, Clivia M. (Institut Català de Nanociència i Nanotecnologia)
Optical forces can set tiny objects in states of mechanical self-sustained oscillation, spontaneously generating periodic signals by extracting power from steady sources. Miniaturized self-sustained coherent phonon sources are interesting for applications such as mass-force sensing, intra-chip metrology and intra-chip time-keeping among others. [...]
2016 - 10.1088/2040-8978/18/9/094006
Journal of optics, Vol. 18, Núm. 9 (September 2016) , art. 94006  

Articles : 19 records found   1 - 10next  jump to record:
Books and collections 1 records found  
1.
4 p, 239.4 KB On the Enhancement of the Thermal Conductivity of Graphene-Based Nanofluids / Rodríguez Laguna, María del Rocío (Institut Català de Nanociència i Nanotecnologia) ; Sotomayor Torres, Clivia M. (Institut Català de Nanociència i Nanotecnologia) ; Gómez Romero, Pedro 1959- (Institut Català de Nanociència i Nanotecnologia) ; Chávez Ángel, Emigdio (Institut Català de Nanociència i Nanotecnologia)
Heat transfer fluids have been extensively used in both low-temperature and high temperature applications (e. g. microelectronics cooling and concentrated solar power). However, their low thermal conductivity is still a limit on performance. [...]
Cork : IEEE, 2018 (Proceedings of the IEEE Conference on Nanotechnology) - 10.1109/NANO.2018.8626244
IEEE 18th International Conference on Nanotechnology (IEEE-NANO), 2018, p. 8626244  

Research literature 2 records found  
1.
169 p, 10.2 MB Heat transfer fluids : from fundamental aspects of graphene nanofluids at room temperature to molten salts formulations for solar-thermal conversion / Rodríguez Laguna, María del Rocío, autor. ; Gómez Romero, Pedro, 1959- supervisor acadèmic. ; Sotomayor Torres, Clivia M, supervisor acadèmic. ; Chávez Ángel, Emigdio, supervisor acadèmic. ; Ros i Badosa, Josep, supervisor acadèmic. ; Universitat Autònoma de Barcelona. Departament de Química
Los fluidos de transferencia de calor, y en particular los nanofluidos, se pueden considerar un elemento esencial en diversos sectores industriales y su rendimiento es clave para una adecuada aplicación en tecnologías que van desde la gestión térmica y la refrigeración, a la generación de energía solar térmica y eléctrica mediante el uso de intercambiadores de calor. [...]
Heat transfer fluids and nanofluids constitute an important element in the industry and their performance is key to the successful application in technologies that go from heat management and cooling to heat exchangers in thermal-solar energy and electricity generation. [...]

[Barcelona] : Universitat Autònoma de Barcelona, 2019.  
2.
240 p, 2.8 MB Confined acoustic phonons in si nanomembranes: impact on thermal properties / Chávez Ángel, Emigdio ; Sotomayor Torres, Clivia M., dir. ; Mompart Penina, Jordi, dir. (Universitat Autònoma de Barcelona. Departament de Física) ; Universitat Autònoma de Barcelona. Departament de Física
La tendencia de la miniaturización tecnológica ha conducido a la generación de densidades de potencia que exceden los 100 watts/cm2, los cuales están en el orden del calor producido en los reactores termonucleares. [...]
The miniaturization trend of the technology has led to power level densities in excess 100 watts/cm2, which are in the order of the heat produced in a nuclear reactor. The need for new cooling techniques has positioned the thermal management on the stage the last years. [...]

[Barcelona] : Universitat Autònoma de Barcelona, 2014  

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