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234 results on '"Gómez, Clara M."'

10. Ultrathin Transparent Nickel Electrodes for Thermoelectric Applications.

Author

Nasiri, Mohammad Ali, Seijas‐Da Silva, Alvaro, Serrano Claumarchirant, José Francisco, Gómez, Clara M, Abellán, Gonzalo, Cantarero, Andrés, and Canet‐Ferrer, Josep

Subjects
NICKEL electrodes, THIN films, THERMOELECTRIC apparatus & appliances, THERMAL conductivity, SEEBECK coefficient, NICKEL films
Abstract

In this work, ultrathin nickel films are developed for application as transparent electrodes in thermoelectric devices. The quality of the films is determined systematically by electrical, optical, and morphological characterization in a series of samples with different thickness. The thermal properties of the films show a dramatic dependence of the Seebeck coefficient on the film thickness. This dependence, with values ranging from −16 to +5 휇V K−1 for thicknesses from 10 to 2 nm, includes a change in the behavior of the thermoelectric response from n‐ to p‐type. It has also been demonstrated that the accurate estimation of the thermal conductivity in thin films is challenging due to substrate effects. In this situation, a differential measurement method based on scanning thermal microscopy is proposed, as in these conditions the measurements are less sensitive to the substrate effects. In further works, the dependence of the thermal properties of ultrathin nickel films can be exploited as a tuning parameter for the design of thermoelectric devices. [ABSTRACT FROM AUTHOR]

Published
2024
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11. Nanoencapsulation of Organic Phase Change Materials in Poly(3,4-Ethylenedioxythiophene) for Energy Storage and Conversion.

Author

Adam-Cervera, Inés, Huerta-Recasens, Jose, Gómez, Clara M., Culebras, Mario, and Muñoz-Espí, Rafael

Subjects
PHASE change materials, ENERGY conversion, ENERGY storage, THERMOELECTRIC apparatus & appliances, LATENT heat, CONDUCTING polymers
Abstract

This work focuses on the encapsulation of two organic phase change materials (PCMs), hexadecane and octadecane, through the formation of nanocapsules of the conducting polymer poly(3,4-ethylenedioxythiophene) (PEDOT) obtained by oxidative polymerization in miniemulsion. The energy storage capacity of nanoparticles is studied by preparing polymer films on supporting substrates. The results indicate that the prepared systems can store and later release thermal energy in the form of latent heat efficiently, which is of vital importance to increase the efficiency of future thermoelectric devices. [ABSTRACT FROM AUTHOR]

Published
2024
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18. Thermoelectric Inks and Power Factor Tunability in Hybrid Films through All Solution Process

Author

Serrano-Claumarchirant, José F., Hamawandi, Bejan, Ergül, Adem, Cantarero, Andrés, Gómez, Clara M., Priyadarshi, Pankaj, Neophytou, Neophytos, Toprak, Muhammet, Serrano-Claumarchirant, José F., Hamawandi, Bejan, Ergül, Adem, Cantarero, Andrés, Gómez, Clara M., Priyadarshi, Pankaj, Neophytou, Neophytos, and Toprak, Muhammet

Abstract

Thermoelectric (TE) materials can have a strong benefit to harvest thermal energy if they can be applied to large areas without losing their performance over time. One way of achieving large-area films is through hybrid materials, where a blend of TE materials with polymers can be applied as coating. Here, we present the development of all solution-processed TE ink and hybrid films with varying contents of TE Sb2Te3 and Bi2Te3 nanomaterials, along with their characterization. Using (1-methoxy-2-propyl) acetate (MPA) as the solvent and poly (methyl methacrylate) as the durable polymer, large-area homogeneous hybrid TE films have been fabricated. The conductivity and TE power factor improve with nanoparticle volume fraction, peaking around 60-70% solid material fill factor. For larger fill factors, the conductivity drops, possibly because of an increase in the interface resistance through interface defects and reduced connectivity between the platelets in the medium. The use of dodecanethiol (DDT) as an additive in the ink formulation enabled an improvement in the electrical conductivity through modification of interfaces and the compactness of the resultant films, leading to a 4-5 times increase in the power factor for both p- and n-type hybrid TE films, respectively. The observed trends were captured by combining percolation theory with analytical resistive theory, with the above assumption of increasing interface resistance and connectivity with polymer volume reduction. The results obtained on these hybrid films open a new low-cost route to produce and implement TE coatings on a large scale, which can be ideal for driving flexible, large-area energy scavenging technologies such as personal medical devices and the IoT., QC 20220520

Published
2022
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22. Electrochemical Deposition of Conductive Polymers on Fabrics.

Author

Serrano-Claumarchirant, Jose F., Muñoz-Espí, Rafael, Cantarero, Andrés, Culebras, Mario, and Gómez, Clara M.

Subjects
MULTIWALLED carbon nanotubes, POLYANILINES, COATED textiles, CONDUCTING polymers, ELECTROTEXTILES, THERMOELECTRIC generators, ELECTRIC conductivity
Abstract

The development of wearable technology has promoted the research of new power supply sources to feed wearable devices without the need of batteries. Wearable thermoelectric generators (wTEGs) can generate energy using the thermal gradient between the human body and the ambient temperature. The most comfortable way to adapt wTEGs to the human body is by using textiles, which are flexible and breathable. In this work, we have developed a method to coat textiles with conductive polymers by electrodeposition on fabrics previously coated with multi-walled carbon nanotubes (MWCNT). The results show that the fabrics coated with polyaniline: sulfuric acid (PANI:H2SO4) present a very low thermal stability, and the variation of the electrical conductivity under wearable stress is not suitable for their use in smart textiles. However, the fabrics coated with poly (3,4-ethylenedioxythiophene: perchlorate) (PEDOT:ClO4) and polypyrrole: perchlorate (PPy:ClO4) show a good thermal stability, positive evolution of the electrical conductivity as a function of the twist angle, bending cycles, and bending radius, demostrating their potential use in practical wearable applications to coat fabrics by electrochemical deposition. [ABSTRACT FROM AUTHOR]

Published
2023
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27. Cover Image, Volume 138, Issue 27

Author

Favero, Diana, primary, Marcon, Victória, additional, Figueroa, Carlos A., additional, Gómez, Clara M., additional, Cros, Ana, additional, Garro, Nuria, additional, Sanchis, Maria J., additional, Carsí, Marta, additional, and Bianchi, Otávio, additional

Published
2021
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33. PEDOT Thin Films with n-Type Thermopower

Author

Serrano-Claumarchirant, José F., primary, Culebras, Mario, additional, Muñoz-Espí, Rafael, additional, Cantarero, Andrés, additional, Gómez, Clara M., additional, and Collins, Maurice N., additional

Published
2019
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39. Effect of Chitin Whiskers on the Molecular Dynamics of Carrageenan-Based Nanocomposites

Author

Universitat Politècnica de València. Departamento de Termodinámica Aplicada - Departament de Termodinàmica Aplicada, Ministerio de la producción, Perú, Ministerio de Economía y Competitividad, Pontificia Universidad Católica del Perú, Carsí Rosique, Marta, Sanchis Sánchez, María Jesús, Gómez, Clara M., Rodriguez, Sol, García-Torres, Fernando, Universitat Politècnica de València. Departamento de Termodinámica Aplicada - Departament de Termodinàmica Aplicada, Ministerio de la producción, Perú, Ministerio de Economía y Competitividad, Pontificia Universidad Católica del Perú, Carsí Rosique, Marta, Sanchis Sánchez, María Jesús, Gómez, Clara M., Rodriguez, Sol, and García-Torres, Fernando

Abstract

[EN] Films of carrageenan (KC) and glycerol (g) with different contents of chitin nanowhiskers (CHW) were prepared by a solution casting process. The molecular dynamics of pure carrageenan (KC), carrageenan/glycerol (KCg) and KCg with different quantities of CHWs as a filler was studied using dielectric relaxation spectroscopy. The analysis of the CHW effect on the molecular mobility at the glass transition, T-g, indicates that non-attractive intermolecular interactions between KCg and CHW occur. The fragility index increased upon CHW incorporation, due to a reduction in the polymer chains mobility produced by the CHW confinement of the KCg network. The apparent activation energy associated with the relaxation dynamics of the chains at T-g slightly increased with the CHW content. The filler nature effect, CHW or montmorillonite (MMT), on the dynamic mobility of the composites was analyzed by comparing the dynamic behavior of both carrageenan-based composites (KCg/xCHW, KCg/xMMT).

Published
2019

47. Desarrollo de un método para obtener nanocompuestos DWCNT/PEDOT para aplicaciones termoeléctricas

Author

Gómez, Clara M., Sanchis, María Jesús, Universitat Politècnica de València. Escuela Técnica Superior de Ingenieros Industriales - Escola Tècnica Superior d'Enginyers Industrials, Villar Gallego, Lina, Gómez, Clara M., Sanchis, María Jesús, Universitat Politècnica de València. Escuela Técnica Superior de Ingenieros Industriales - Escola Tècnica Superior d'Enginyers Industrials, and Villar Gallego, Lina

Abstract

Proyecto Confidencial (Riunet)

Published
2016

49. Rheological study of gel phenomena during epoxide network formation in the presence of sepiolite

Author

Nohales, Andrés, López, Daniel, Culebras, Mario, and Gómez, Clara M.

Subjects
sepiolite, gelation, rheology, macromolecular substances, epoxy resin
Abstract

The dynamic behaviour during the crosslinking of an epoxy polymer near the gel point was monitored using rheological multiple frequency experiments. The influence of a needle-shaped inorganic nanofiller, sepiolite, either non-modified or organically surface modified during the cure process in the presence of an aliphatic and an aromatic hardener was investigated. The validity of various criteria for determining the gel point was examined for the crosslinking of these filled thermosets. The Winter-Chambon criterion at the gel point is obeyed by the unfilled and by the non-modified sepiolite-filled epoxy matrix with either of the two hardeners. However, physical gels are formed in the presence of the organically modified sepiolite and the Winter-Chambon criterion is not valid. For all the systems investigated, the nanofiller reduces the time to reach gelation. Critical relaxation exponents and gel strength have been determined indicating a more elastic and stronger gel in the presence of the aliphatic hardener.

Published
2013

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