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Publikasjoner (10 av 98) Visa alla publikasjoner
Malm, V., Seoane, F. & Nierstrasz, V. (2019). Characterisation of Electrical and Stiffness Properties of Conductive Textile Coatings with Metal Flake-shaped Fillers. Materials, 12(21), 1-18
Åpne denne publikasjonen i ny fane eller vindu >>Characterisation of Electrical and Stiffness Properties of Conductive Textile Coatings with Metal Flake-shaped Fillers
2019 (engelsk)Inngår i: Materials, ISSN 1996-1944, E-ISSN 1996-1944, Vol. 12, nr 21, s. 1-18Artikkel i tidsskrift (Fagfellevurdert) Submitted
Abstract [en]

Two conductive formulations containing different types of micron-sized metal flakes (silver-coated copper (Cu) and pure silver (Ag)) were characterised and used to form highly electrically conductive coatings (conductors) on plain and base-coated woven fabrics, the latter in an encapsulated construction. With e-textiles as the intended application, the fabric stiffness, in terms of flexural stiffness and sheet resistance (Rsh), after durability testing (laundering and abrasion) was investigated and related to user friendliness and long-term performance. Bare and encapsulated conductors with increasing amounts of deposited solids were fabricated by adjusting the knife coating parameters, such as the coating gap height (5, 20, 50, and 200 μm), which reduced the Rsh, as determined by four-point probe (4PP) measurements; however, this improvement was at the expense of increased flexural stiffness of the coated fabrics. The addition of a melamine derivative (MF) as a cross-linker to the Cu formulation and the encapsulation of both conductor types gave the best trade-off between durability and Rsh, as confirmed by 4PP measurements. However, the infrared camera images revealed the formation of hotspots within the bare conductor matrix, although low resistances (determined by 4PP) and no microstructural defects (determined by SEM) were detected. These results stress the importance of thorough investigation to assure the design of reliable conductors applied on textiles requiring this type of maintenance.

Emneord
Conductivity, metal flake, coating, textile, coating parameters, encapsulation, fabric stiffness, durability
HSV kategori
Forskningsprogram
Textil och mode (generell)
Identifikatorer
urn:nbn:se:hb:diva-13942 (URN)10.3390/ma12213537 (DOI)000502798800078 ()2-s2.0-85074669865 (Scopus ID)
Tilgjengelig fra: 2018-04-04 Laget: 2018-04-04 Sist oppdatert: 2020-03-04bibliografisk kontrollert
Malm, V., Nierstrasz, V. & Seoane, F. (2019). Characterisation of Electrical and Stiffness Properties of Conductive Textile Coatings with Metal Flake-Shaped Fillers. Materials, 12(21), 1-18, Article ID 3537.
Åpne denne publikasjonen i ny fane eller vindu >>Characterisation of Electrical and Stiffness Properties of Conductive Textile Coatings with Metal Flake-Shaped Fillers
2019 (engelsk)Inngår i: Materials, ISSN ISSN 1996-1944, Vol. 12, nr 21, s. 1-18, artikkel-id 3537Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Two conductive formulations containing different types of micron-sized metal flakes (silver-coated copper (Cu) and pure silver (Ag)) were characterised and used to form highly electrically conductive coatings (conductors) on plain and base-coated woven fabrics, the latter in an encapsulated construction. With e-textiles as the intended application, the fabric stiffness, in terms of flexural stiffness and sheet resistance (Rsh), after durability testing (laundering and abrasion) was investigated and related to user friendliness and long-term performance. Bare and encapsulated conductors with increasing amounts of deposited solids were fabricated by adjusting the knife coating parameters, such as the coating gap height (5, 20, 50, and 200 μm), which reduced the Rsh, as determined by four-point probe (4PP) measurements; however, this improvement was at the expense of increased flexural stiffness of the coated fabrics. The addition of a melamine derivative (MF) as a cross-linker to the Cu formulation and the encapsulation of both conductor types gave the best trade-off between durability and Rsh, as confirmed by 4PP measurements. However, the infrared camera images revealed the formation of hotspots within the bare conductor matrix, although low resistances (determined by 4PP) and no microstructural defects (determined by SEM) were detected. These results stress the importance of thorough investigation to assure the design of reliable conductors applied on textiles requiring this type of maintenance.

Emneord
conductivity, metal flake, coating, e-textile, encapsulation, durability, stiffness
HSV kategori
Forskningsprogram
Textil och mode (generell)
Identifikatorer
urn:nbn:se:hb:diva-23090 (URN)10.3390/ma12213537 (DOI)
Tilgjengelig fra: 2020-03-30 Laget: 2020-03-30 Sist oppdatert: 2020-04-15bibliografisk kontrollert
Seoane, F., Soroudi, A., Lu, K., Nilsson, D., Nilsson, M., Abtahi, F. & Skrifvars, M. (2019). Textile-Friendly Interconnection between Wearable Measurement Instrumentation and Sensorized Garments—Initial Performance Evaluation for Electrocardiogram Recordings. Sensors, 19(29), 4426
Åpne denne publikasjonen i ny fane eller vindu >>Textile-Friendly Interconnection between Wearable Measurement Instrumentation and Sensorized Garments—Initial Performance Evaluation for Electrocardiogram Recordings
Vise andre…
2019 (engelsk)Inngår i: Sensors, ISSN 1424-8220, E-ISSN 1424-8220, Vol. 19, nr 29, s. 4426-Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The interconnection between hard electronics and soft textiles remains a noteworthy challenge in regard to the mass production of textile–electronic integrated products such as sensorized garments. The current solutions for this challenge usually have problems with size, flexibility, cost, or complexity of assembly. In this paper, we present a solution with a stretchable and conductive carbon nanotube (CNT)-based paste for screen printing on a textile substrate to produce interconnectors between electronic instrumentation and a sensorized garment. The prototype connectors were evaluated via electrocardiogram (ECG) recordings using a sensorized textile with integrated textile electrodes. The ECG recordings obtained using the connectors were evaluated for signal quality and heart rate detection performance in comparison to ECG recordings obtained with standard pre-gelled Ag/AgCl electrodes and direct cable connection to the ECG amplifier. The results suggest that the ECG recordings obtained with the CNT paste connector are of equivalent quality to those recorded using a silver paste connector or a direct cable and are suitable for the purpose of heart rate detection.

Emneord
conductive polymers, wearable technology, smart textiles, textile–electronic integration
HSV kategori
Identifikatorer
urn:nbn:se:hb:diva-23229 (URN)10.3390/s19204426 (DOI)
Tilgjengelig fra: 2020-05-25 Laget: 2020-05-25 Sist oppdatert: 2020-05-28bibliografisk kontrollert
Malm, V., Nierstrasz, V. & Seoane, F. (2018). Electrical resistance characterisations and durability of textile coatings containing metal flake fillers. In: : . Paper presented at 57th Dornbirn Global Fiber Congress, Dornbirn Austria, September 12–14, 2018.
Åpne denne publikasjonen i ny fane eller vindu >>Electrical resistance characterisations and durability of textile coatings containing metal flake fillers
2018 (engelsk)Konferansepaper, Oral presentation only (Fagfellevurdert)
HSV kategori
Forskningsprogram
Textil och mode (generell)
Identifikatorer
urn:nbn:se:hb:diva-15188 (URN)
Konferanse
57th Dornbirn Global Fiber Congress, Dornbirn Austria, September 12–14, 2018
Tilgjengelig fra: 2018-10-08 Laget: 2018-10-08 Sist oppdatert: 2018-11-20bibliografisk kontrollert
Malm, V., Seoane, F. & Nierstrasz, V. (2018). Fused deposition modelling – Towards 3D printed electrodes on fabric for surface electromyography (sEMG). In: : . Paper presented at IDTechEx, Berlin, 11-12 April, 2018..
Åpne denne publikasjonen i ny fane eller vindu >>Fused deposition modelling – Towards 3D printed electrodes on fabric for surface electromyography (sEMG)
2018 (engelsk)Konferansepaper, Poster (with or without abstract) (Annet vitenskapelig)
Abstract [en]

Surface electromyography (sEMG) monitoring has promising applications within the field of human robot communication where wearable electrodes are used as the interface. This research investigates the production of flexible 3D printed electrodes using electrically conductive filaments, of thermoplastic polyurethane containing carbon black, and polyester fabric as substrate. Dry 3D printed electrodes of varying thickness, due to increased number of layers, were compared to conventional electrolytic gel electrodes. Initial tests show that the volume resistivity of 3D printed electrodes increased with increased number of layers. This because, with increased number of layers the diffusion between layers deteriorates and hinders conductive particle connections. Additional heat-treatments using hot press plates to improve diffusion between layers were promising as volume resistivity decreased with 200 % for all samples. As a first step to evaluate the 3D printed electrodes, skin-electrode impedance measurements were performed, and compared with measurements of conventional electrodes. Results showed that resistance and reactance versus frequency curves had similar trending slopes, decreasing with increasing frequency. However, this corresponded only between the thinnest (200 μm) 3D-printed dry electrode having a volume resistivity of 6.2 Ω cm and the conventional gel electrode. Future studies regarding the influence of platform and extruder temperature are planned for, focusing on improved diffusion between layers and increased conduction for proper electron transfer. 

Emneord
3D printing, electrodes, conductive filament, fabric, diffusion, printing parameters, surface electromyography
HSV kategori
Forskningsprogram
Textil och mode (generell)
Identifikatorer
urn:nbn:se:hb:diva-15187 (URN)
Konferanse
IDTechEx, Berlin, 11-12 April, 2018.
Forskningsfinansiär
Region Västra Götaland, 2016-01342
Tilgjengelig fra: 2018-10-08 Laget: 2018-10-08 Sist oppdatert: 2018-11-20bibliografisk kontrollert
Abtahi, F., Anund, A., Fors, C., Seoane, F. & Lindecrantz, K. (2017). Association of Drivers’ sleepiness with heart rate variability. A Pilot Study with Drivers on Real Road. In: : . Paper presented at European Medical and Biological Engineering Confernce Nordic-Baltic Conference on Biomedical Engineering and Medical Physics, EMBEC2017 (pp. 149-152). Springer, Singapore
Åpne denne publikasjonen i ny fane eller vindu >>Association of Drivers’ sleepiness with heart rate variability. A Pilot Study with Drivers on Real Road
Vise andre…
2017 (engelsk)Konferansepaper, Publicerat paper (Annet vitenskapelig)
sted, utgiver, år, opplag, sider
Springer, Singapore, 2017
HSV kategori
Identifikatorer
urn:nbn:se:hb:diva-13764 (URN)
Konferanse
European Medical and Biological Engineering Confernce Nordic-Baltic Conference on Biomedical Engineering and Medical Physics, EMBEC2017
Tilgjengelig fra: 2018-03-03 Laget: 2018-03-03 Sist oppdatert: 2018-03-20bibliografisk kontrollert
Jiong, S., Billing, E., Seoane, F., Zhou, B., Högberg, D. & Hemeren, P. (2017). Categories of touch: Classifying human touch using a soft tactile sensor. In: The robotic sense of touch: From sensing to understanding, workshop at the IEEE International Conference on Robotics and Automation (ICRA), 29 May, Singapore.: . Paper presented at IEEE International Conference on Robotics and Automation (ICRA), Singapore, 29 May, 2017..
Åpne denne publikasjonen i ny fane eller vindu >>Categories of touch: Classifying human touch using a soft tactile sensor
Vise andre…
2017 (engelsk)Inngår i: The robotic sense of touch: From sensing to understanding, workshop at the IEEE International Conference on Robotics and Automation (ICRA), 29 May, Singapore., 2017Konferansepaper, Oral presentation with published abstract (Fagfellevurdert)
HSV kategori
Identifikatorer
urn:nbn:se:hb:diva-13766 (URN)
Konferanse
IEEE International Conference on Robotics and Automation (ICRA), Singapore, 29 May, 2017.
Tilgjengelig fra: 2018-03-03 Laget: 2018-03-03 Sist oppdatert: 2018-04-03bibliografisk kontrollert
Seoane, F. & Atefi, S. R. (2017). Electrical bioimpedance enabling prompt intervention in traumatic brain injury. In: SPIE Micro-and Nanotechnology Sensors, Systems, and Applications IX: . Paper presented at SPIE Defense + Commercial Sensing 2017, Annaheim, April 9-13, 2017.
Åpne denne publikasjonen i ny fane eller vindu >>Electrical bioimpedance enabling prompt intervention in traumatic brain injury
2017 (engelsk)Inngår i: SPIE Micro-and Nanotechnology Sensors, Systems, and Applications IX, 2017Konferansepaper, Publicerat paper (Fagfellevurdert)
HSV kategori
Identifikatorer
urn:nbn:se:hb:diva-13763 (URN)10.1117/12.2263672 (DOI)000411756000016 ()2-s2.0-85024393605 (Scopus ID)
Konferanse
SPIE Defense + Commercial Sensing 2017, Annaheim, April 9-13, 2017
Tilgjengelig fra: 2018-03-03 Laget: 2018-03-03 Sist oppdatert: 2018-12-07bibliografisk kontrollert
Hafid, A., Benouar, S., Kedir-Talha, M., Abtahi, F., Attari, M. & Seoane, F. (2017). Full Impedance Cardiography measurement device using Raspberry PI3 and System-on-Chip biomedical Instrumentation Solutions. IEEE journal of biomedical and health informatics
Åpne denne publikasjonen i ny fane eller vindu >>Full Impedance Cardiography measurement device using Raspberry PI3 and System-on-Chip biomedical Instrumentation Solutions
Vise andre…
2017 (engelsk)Inngår i: IEEE journal of biomedical and health informatics, ISSN 2168-2194, E-ISSN 2168-2208Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Impedance Cardiography (ICG) is a non-invasive method for monitoring cardiac dynamics using Electrical Bioimpedance (EBI) measurements. Since its appearance more than 40 years ago, ICG has been used for assessing hemodynamic parameters. This paper present a measurement system based on two System on Chip (SoC) solutions and Raspberry PI, implementing both a full 3-lead ECG recorder and an impedance cardiographer, for educational and research development purposes. Raspberry PI is a platform supporting Do-It-Yourself project and education applications across the world. The development is part of Biosignal PI, an open hardware platform focusing in quick prototyping of physiological measurement instrumentation. The SoC used for sensing cardiac biopotential is the ADAS1000, and for the EBI measurement is the AD5933. The recording were wirelessly transmitted through Bluetooth to a PC, where the waveforms were displayed, and hemodynamic parameters such as heart rate, stroke volume, ejection time and cardiac output were extracted from the ICG and ECG recordings. These results show how Raspberry PI can be used for quick prototyping using relatively widely available and affordable components, for supporting developers in research and engineering education. The design and development documents, will be available on www.BiosignalPI.com, for open access under a Non Commercial-Share A like 4.0 International License.

sted, utgiver, år, opplag, sider
IEEE, 2017
HSV kategori
Identifikatorer
urn:nbn:se:hb:diva-13769 (URN)10.1109/JBHI.2017.2783949 (DOI)000447833100019 ()29990025 (PubMedID)2-s2.0-85038859857 (Scopus ID)
Tilgjengelig fra: 2018-03-03 Laget: 2018-03-03 Sist oppdatert: 2018-12-07bibliografisk kontrollert
Vega-Barbas, M., Pau, I., Augusto, J. C. & Seoane, F. (2017). Interaction patterns for smart spaces. A confident interaction design solution for pervasive sensitive IoT services. IEEE Access
Åpne denne publikasjonen i ny fane eller vindu >>Interaction patterns for smart spaces. A confident interaction design solution for pervasive sensitive IoT services
2017 (engelsk)Inngår i: IEEE Access, E-ISSN 2169-3536Artikkel i tidsskrift (Fagfellevurdert) Published
sted, utgiver, år, opplag, sider
IEEE, 2017
HSV kategori
Identifikatorer
urn:nbn:se:hb:diva-13767 (URN)10.1109/ACCESS.2017.2777999 (DOI)000425679700010 ()2-s2.0-85035770904 (Scopus ID)
Tilgjengelig fra: 2018-03-03 Laget: 2018-03-03 Sist oppdatert: 2018-12-21bibliografisk kontrollert
Organisasjoner
Identifikatorer
ORCID-id: ORCID iD iconorcid.org/0000-0002-6995-967X