The processing of polycarbonate nanocomposites generated with various nanofillers

Becker, Daniela; Coelho, Luci Boa Nova

doi:10.1016/b978-1-78242-308-9.00005-7

Cited by 2 publications

(2 citation statements)

References 57 publications

(96 reference statements)

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“…Recently, MWCNT has been added to one of the triboelectric layers to improve the energy conversion efficiency owing to improved surface charge density of TPU [29][30][31][32]. MWCNT have a high aspect ratio and high conductivity and have been widely used in polymeric matrices to improve the electrical and mechanical properties [33]. Furthermore, polymer-based nanofibers offer better stretchability and effective contact surface area compared to polymer films.…”

Section: Introductionmentioning

confidence: 99%

Functionalized Thermoplastic Polyurethane Nanofibers: An Innovative Triboelectric Energy Generator

Salas,

de Leon,

Abir

et al. 2023

Electronic Materials

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A triboelectric nanogenerator (TENG) is one of the most significantly innovative microdevices for built-in energy harvesting with wearable and portable electronics. In this study, the forcespinning technology was used to synthesize a nanofiber (NF) mat-based TENG. Polyvinylidene fluoride (PVDF) membrane was used as the negative triboelectric electrode/pole, and chemically designed and functionalized thermoplastic polyurethane (TPU) was used as the positive electrode/pole for the TENG. The electronic interference, sensitivity, and gate voltage of the synthesized microdevices were investigated using chemically modified bridging of multi-walled carbon nanotubes (MWCNT) with a TPU polymer repeating unit and bare TPU-based positive electrodes. The chemical functionality of TPU NF was integrated during the NF preparation step. The morphological features and the chemical structure of the nanofibers were characterized using a field emission scanning electron microscope and Fourier-transform infrared spectroscopy. The electrical output of the fabricated MWCNT-TPU/PVDF TENG yielded a maximum of 212 V in open circuit and 70 µA in short circuit at 240 beats per minute, which proved to be 79% and 15% higher than the TPU/PDVF triboelectric nanogenerator with an electronic contact area of 3.8 × 3.8 cm2, which indicates that MWCNT enhanced the electron transportation facility, which results in significantly enhanced performance of the TENG. This device was further tested for its charging capacity and sensory performance by taking data from different body parts, e.g., the chest, arms, feet, hands, etc. These results show an impending prospect and versatility of the chemically functionalized materials for next-generation applications in sensing and everyday energy harvesting technology.

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Section: Introductionmentioning

confidence: 99%

Functionalized Thermoplastic Polyurethane Nanofibers: An Innovative Triboelectric Energy Generator

Salas,

de Leon,

Abir

et al. 2023

Electronic Materials

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“…Two or more materials that can be considered as composite materials that have beneficial chemical and physical properties when connected together, an example is cement with fillers such as the fibre glass or carbon fibres, silica fly ash etc. (Schuster, Becker, & Coelho, 2015;Zaman et al, 2013) Materials at the nanosize level are made by applying one of two main methods: topdown or bottom-up which decompose or divide the original materials to make small pieces in the nanoscale, one dimension or more, or assemble the materials at the atom scale to nanostructure. There is another new definition that depends on the volume or the specific surface area (VSSA).…”

Section: 2mentioning

confidence: 99%

High Performance Reinforced Hemp-Lime Nanocomposite Construction Materials

Khalaf¹

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The aim of the project is to develop high performance, lightweight, durable, and environmentally friendly construction materials. Construction materials should have high compressive and flexural strength, low porosity, low thermal conductivity, low shrinkage and high water vapour permeability (breathability). The following materials were selected to achieve this aim; lime was selected as the base matrix material with hemp (fibres and shives) and wood glue (Poly vinyl acetate, PVAc). Specially selected nanomaterials were used as fillers. The properties of the developed material were used to design an eco-friendly wall consisting of a central 'Core' which will be the load bearing element, highly insulative layers with low thermal conductivity 'Insulators' and outer rendering materials for enhanced aesthetics purpose and breathability 'Renders'. The research conducted in this project enabled a number of different construction materials to be developed, each exhibiting their own characteristics to enable the aims and objectives of the project to be achieved. A summary of the findings is as follows: A load bearing wall requires relatively high compressive and flexural strengths of about 5 MPa and 4.0 MPa, respectively or higher. The 'Core' material designed consisted of 10 wt. % hemp fibres, 12 % PVAc/L, 4 wt. % nZnO (nanozinc oxide) and lime (NHL5, which its quantity was 1 kg for each batch of 4 samples for the whole project) and prepared using air curing method. The compressive strength was 17.7 MPa and the flexural strength was greater than 7.0 MPa, which were the highest results of strength throughout the project. The same mentioned mixture (10 wt. % hemp fibres, 12 % PVAc/L, 4 wt. % nanozinc oxide of lime) was cured using 'Ovendrying', the strengths in compression and flexure were still considerable, being 10 MPa and 4 MPa respectively which were more than the minimum limit of loadbearing material. This material, therefore, due to its high compressive strength, used as the 'Core' load bearing element of the proposed wall in the absence of a timber framework. The 'Insulator' was developed using a water removal 'Solvent exchange' technique and the mixture was 20 wt. % hemp shives, 12 % PVAc/L, 4 wt. % nanozinc oxide and lime. The thermal conductivity was 0.06 W/mK, much lower than that of pure lime which was 0.16 W/mK. The 'Insulator' will be applied in two layers, one on either side of the 'Core'. The 'Render' was developed using lime and 4 wt. % nanozinc oxide by wt. of lime and cured via air curing. It possessed a low porosity (18 %) in comparison to that of pure lime (36.4 %) and low thermal conductivity,  (0.13 W/mK) in comparison to pure lime 0.16 W/mK cured by solvent exchange. Shrinkage was lowest in a Render material containing 4 % wt. nZnO, averaging 750 microstrain (µs) compared to the control sample (lime only) of 2428 µs. Chopped fibres, PVAc and nanozinc oxide were used for the first time with lime and no other examples of this exist in the literature (in the best knowledge of the researcher). Water ...

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The processing of polycarbonate nanocomposites generated with various nanofillers

Cited by 2 publications

References 57 publications

Functionalized Thermoplastic Polyurethane Nanofibers: An Innovative Triboelectric Energy Generator

Functionalized Thermoplastic Polyurethane Nanofibers: An Innovative Triboelectric Energy Generator

High Performance Reinforced Hemp-Lime Nanocomposite Construction Materials

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