Properties of Polysiloxane/Nanosilica Nanodielectrics for Wearable Electronic Devices
Polymer nanodielectrics characterized by good flexibility, processability, low dielectric loss and high dielectric permittivity are materials of interest for wearable electronic devices and intelligent textiles, and are highly in demand in robotics. In this study, an easily scalable and environmenta...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-12-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/12/1/95 |
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| author | Elena Ruxandra Radu Denis Mihaela Panaitescu Laura Andrei Florin Ciuprina Cristian Andi Nicolae Augusta Raluca Gabor Roxana Truşcă |
| author_facet | Elena Ruxandra Radu Denis Mihaela Panaitescu Laura Andrei Florin Ciuprina Cristian Andi Nicolae Augusta Raluca Gabor Roxana Truşcă |
| author_sort | Elena Ruxandra Radu |
| collection | DOAJ |
| description | Polymer nanodielectrics characterized by good flexibility, processability, low dielectric loss and high dielectric permittivity are materials of interest for wearable electronic devices and intelligent textiles, and are highly in demand in robotics. In this study, an easily scalable and environmentally friendly method was applied to obtain polysiloxane/nanosilica nanocomposites with a large content of nanofiller, of up to 30% by weight. Nanosilica was dispersed both as individual particles and as agglomerates; in nanocomposites with a lower amount of filler, the former prevailed, and at over 20 wt% nanosilica the agglomerates predominated. An improvement of both the tensile strength and modulus was observed for nanocomposites with 5–15 wt% nanosilica, and a strong increase of the storage modulus was observed with the increase of nanofiller concentration. Furthermore, an increase of the storage modulus of up to seven times was observed in the nanocomposites with 30 wt% nanosilica. The tensile modulus was well fitted by models that consider the aggregation of nanoparticles and the role of the interface. The dielectric spectra showed an increase of the real part of the complex relative permittivity with 33% for 30 wt% nanosilica in nanocomposites at a frequency of 1 KHz, whereas the loss tangent values were lower than 0.02 for all tested nanodielectrics in the radio frequency range between 1 KHz and 1 MHz. The polysiloxane–nanosilica nanocomposites developed in this work showed good flexibility; however, they also showed increased stiffness along with a stronger dielectric response than the unfilled polysiloxane, which recommends them as dielectric substrates for wearable electronic devices. |
| first_indexed | 2024-03-10T03:29:23Z |
| format | Article |
| id | doaj.art-e0b8323b3f364617ad5af778066d47f4 |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-10T03:29:23Z |
| publishDate | 2021-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-e0b8323b3f364617ad5af778066d47f42023-11-23T12:01:23ZengMDPI AGNanomaterials2079-49912021-12-011219510.3390/nano12010095Properties of Polysiloxane/Nanosilica Nanodielectrics for Wearable Electronic DevicesElena Ruxandra Radu0Denis Mihaela Panaitescu1Laura Andrei2Florin Ciuprina3Cristian Andi Nicolae4Augusta Raluca Gabor5Roxana Truşcă6National Institute for R&D in Chemistry and Petrochemistry ICECHIM, 202 Spl. Indendentei, 060021 Bucharest, RomaniaNational Institute for R&D in Chemistry and Petrochemistry ICECHIM, 202 Spl. Indendentei, 060021 Bucharest, RomaniaELMAT Laboratory, Faculty of Electrical Engineering, University Politehnica of Bucharest, 313 Spl. Indendentei, 060042 Bucharest, RomaniaELMAT Laboratory, Faculty of Electrical Engineering, University Politehnica of Bucharest, 313 Spl. Indendentei, 060042 Bucharest, RomaniaNational Institute for R&D in Chemistry and Petrochemistry ICECHIM, 202 Spl. Indendentei, 060021 Bucharest, RomaniaNational Institute for R&D in Chemistry and Petrochemistry ICECHIM, 202 Spl. Indendentei, 060021 Bucharest, RomaniaNational Research Centre for Micro and Nanomaterials, University Politehnica of Bucharest, 313 Spl. Indendentei, 060042 Bucharest, RomaniaPolymer nanodielectrics characterized by good flexibility, processability, low dielectric loss and high dielectric permittivity are materials of interest for wearable electronic devices and intelligent textiles, and are highly in demand in robotics. In this study, an easily scalable and environmentally friendly method was applied to obtain polysiloxane/nanosilica nanocomposites with a large content of nanofiller, of up to 30% by weight. Nanosilica was dispersed both as individual particles and as agglomerates; in nanocomposites with a lower amount of filler, the former prevailed, and at over 20 wt% nanosilica the agglomerates predominated. An improvement of both the tensile strength and modulus was observed for nanocomposites with 5–15 wt% nanosilica, and a strong increase of the storage modulus was observed with the increase of nanofiller concentration. Furthermore, an increase of the storage modulus of up to seven times was observed in the nanocomposites with 30 wt% nanosilica. The tensile modulus was well fitted by models that consider the aggregation of nanoparticles and the role of the interface. The dielectric spectra showed an increase of the real part of the complex relative permittivity with 33% for 30 wt% nanosilica in nanocomposites at a frequency of 1 KHz, whereas the loss tangent values were lower than 0.02 for all tested nanodielectrics in the radio frequency range between 1 KHz and 1 MHz. The polysiloxane–nanosilica nanocomposites developed in this work showed good flexibility; however, they also showed increased stiffness along with a stronger dielectric response than the unfilled polysiloxane, which recommends them as dielectric substrates for wearable electronic devices.https://www.mdpi.com/2079-4991/12/1/95nanocompositesdielectric propertiesDMAflexible electronicspolysiloxanessilica nanoparticles |
| spellingShingle | Elena Ruxandra Radu Denis Mihaela Panaitescu Laura Andrei Florin Ciuprina Cristian Andi Nicolae Augusta Raluca Gabor Roxana Truşcă Properties of Polysiloxane/Nanosilica Nanodielectrics for Wearable Electronic Devices Nanomaterials nanocomposites dielectric properties DMA flexible electronics polysiloxanes silica nanoparticles |
| title | Properties of Polysiloxane/Nanosilica Nanodielectrics for Wearable Electronic Devices |
| title_full | Properties of Polysiloxane/Nanosilica Nanodielectrics for Wearable Electronic Devices |
| title_fullStr | Properties of Polysiloxane/Nanosilica Nanodielectrics for Wearable Electronic Devices |
| title_full_unstemmed | Properties of Polysiloxane/Nanosilica Nanodielectrics for Wearable Electronic Devices |
| title_short | Properties of Polysiloxane/Nanosilica Nanodielectrics for Wearable Electronic Devices |
| title_sort | properties of polysiloxane nanosilica nanodielectrics for wearable electronic devices |
| topic | nanocomposites dielectric properties DMA flexible electronics polysiloxanes silica nanoparticles |
| url | https://www.mdpi.com/2079-4991/12/1/95 |
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