Utilize este identificador para referenciar este registo:
https://hdl.handle.net/1822/86972
Registo completo
Campo DC | Valor | Idioma |
---|---|---|
dc.contributor.author | Esteves, David Seixas | por |
dc.contributor.author | Pereira, Manuel F. C. | por |
dc.contributor.author | Ribeiro, Ana | por |
dc.contributor.author | Durães, Nelson | por |
dc.contributor.author | Paiva, Maria C. | por |
dc.contributor.author | Sequeiros, Elsa W. | por |
dc.date.accessioned | 2023-10-18T10:38:48Z | - |
dc.date.available | 2023-10-18T10:38:48Z | - |
dc.date.issued | 2023-06-29 | - |
dc.identifier.citation | Esteves, D.S.; Pereira, M.F.C.; Ribeiro, A.; Durães, N.; Paiva, M.C.; Sequeiros, E.W. Development of MWCNT/Magnetite Flexible Triboelectric Sensors by Magnetic Patterning. Polymers 2023, 15, 2870. https://doi.org/10.3390/polym15132870 | por |
dc.identifier.uri | https://hdl.handle.net/1822/86972 | - |
dc.description.abstract | The fabrication of low-electrical-percolation-threshold polymer composites aims to reduce the weight fraction of the conductive nanomaterial necessary to achieve a given level of electrical resistivity of the composite. The present work aimed at preparing composites based on multiwalled carbon nanotubes (MWCNTs) and magnetite particles in a polyurethane (PU) matrix to study the effect on the electrical resistance of electrodes produced under magnetic fields. Composites with 1 wt.% of MWCNT, 1 wt.% of magnetite and combinations of both were prepared and analysed. The hybrid composites combined MWCNTs and magnetite at the weight ratios of 1:1; 1:1/6; 1:1/12; and 1:1/24. The results showed that MWCNTs were responsible for the electrical conductivity of the composites since the composites with 1 wt.% magnetite were non-conductive. Combining magnetite particles with MWCNTs reduces the electrical resistance of the composite. SQUID analysis showed that MWCNTs simultaneously exhibit ferromagnetism and diamagnetism, ferromagnetism being dominant at lower magnetic fields and diamagnetism being dominant at higher fields. Conversely, magnetite particles present a ferromagnetic response much stronger than MWCNTs. Finally, optical microscopy (OM) and X-ray micro computed tomography (micro CT) identified the interaction between particles and their location inside the composite. In conclusion, the combination of magnetite and MWCNTs in a polymer composite allows for the control of the location of these particles using an external magnetic field, decreasing the electrical resistance of the electrodes produced. By adding 1 wt.% of magnetite to 1 wt.% of MWCNT (1:1), the electric resistance of the composites decreased from 9 × 104 to 5 × 103 Ω. This approach significantly improved the reproducibility of the electrode’s fabrication process, enabling the development of a triboelectric sensor using a polyurethane (PU) composite and silicone rubber (SR). Finally, the method’s bearing was demonstrated by developing an automated robotic soft grip with tendon-driven actuation controlled by the triboelectric sensor. The results indicate that magnetic patterning is a versatile and low-cost approach to manufacturing sensors for soft robotics. | por |
dc.description.sponsorship | This research is part of the PhD project at the Doctoral Program in Advanced Materials and Processing—FEUP. We want to thank CeNTI for providing resources (labs, equipment and consumables) to perform the fabrication and characterisation of the samples. IPC acknowledges the support of the Portuguese Foundation for Science and Technology (FCT) through the National Funds Reference UIDB/05256/2020 and UIDP/05256/2020. This work was also supported by LAETA/INEGI—Associate Laboratory in Energy, Transport and Aeronautics/Institute of Science and Innovation in Mechanical and Industrial Engineering and by the strategic project CERENA—UID/ECI/04028/2019. | por |
dc.language.iso | eng | por |
dc.publisher | Multidisciplinary Digital Publishing Institute (MDPI) | por |
dc.relation | info:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F05256%2F2020/PT | por |
dc.relation | info:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDP%2F05256%2F2020/PT | por |
dc.relation | info:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UID%2FECI%2F04028%2F2019/PT | por |
dc.rights | openAccess | por |
dc.rights.uri | http://creativecommons.org/licenses/by/4.0/ | por |
dc.subject | MWCNT | por |
dc.subject | Ferromagnetic | por |
dc.subject | Flexible and stretchable sensors | por |
dc.subject | Smart composites | por |
dc.subject | Sensor fabrication | por |
dc.subject | Polymer composites | por |
dc.subject | Polymer actuators | por |
dc.subject | Soft robotics | por |
dc.title | Development of MWCNT/Magnetite flexible triboelectric sensors by magnetic patterning | por |
dc.type | article | por |
dc.peerreviewed | yes | por |
dc.relation.publisherversion | https://www.mdpi.com/2073-4360/15/13/2870 | por |
oaire.citationStartPage | 1 | por |
oaire.citationEndPage | 17 | por |
oaire.citationIssue | 1 | por |
oaire.citationVolume | 15 | por |
dc.date.updated | 2023-07-13T14:07:51Z | - |
dc.identifier.eissn | 2073-4360 | - |
dc.identifier.doi | 10.3390/polym15132870 | por |
sdum.journal | Polymers | por |
oaire.version | VoR | por |
Aparece nas coleções: | IPC - Artigos em revistas científicas internacionais com arbitragem |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
---|---|---|---|---|
polymers-15-02870.pdf | 11,82 MB | Adobe PDF | Ver/Abrir |
Este trabalho está licenciado sob uma Licença Creative Commons