A novel physicomechanical approach to dispersion of carbon nanotubes in polypropylene composites

Kim, G.M.; Kil, Taegeon; Lee, Haeng‐Ki

doi:10.1016/j.compstruct.2020.113377

Cited by 26 publications

(14 citation statements)

References 39 publications

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“…This method of fabrication established without sonic treatment has poor flowability and the agglomerates of the nanofillers were not dispersed properly 191 . The physico‐mechanical technique produces synergistic effect of silica fume while ultrasonication produces physical shock to the filler bundles, which in turn tends to improve the dispersion 192 . One of the studies found that sonication process alone is not sufficient for dispersing GNP in water and thus necessitates the combination of mechanical and surfactant treatments for homogeneous dispersion 193 .…”

Section: Process and Methods Of Dispersion Technologymentioning

confidence: 99%

Smart cement‐sensor composite: The evolution of nanomaterial in developing sensor for structural integrity

Kanagasundaram

Elavenil

2023

Structural Concrete

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The integration of self‐sensing ability and different functional properties of nanomaterials into construction materials leads to smart and multifunctional cementitious sensor composites. Significant evolution of the Structural Health Monitoring (SHM) has helped to elevate the life span and mitigate damages of the structure. Developing smart cementitious sensor composite with electrical properties as a parent element and embedding it in the structural components have proved to be advantageous in terms of evaluating the damages, monitoring the periodic health and life assessment of the structures. In this review, the copious development processes and various methods of designing smart‐sensing cementitious composites have been scrutinized. This work recapitulates the principle of self‐sensing technique, typical functional fillers, trends of percolation threshold, dispersing material, dispersion technology, and also describes the required sensing ability of the sensors using the conduction theory. Subsequently application of smart cement‐sensors in structural components for SHM is discussed. In addition, this review article provides comprehensive information on the effects of nano materials and their dispersion in the development for smart and multifaceted cementitious sensor composites with enhanced sensitivity parameters and economic benefits that are suitable for future prospects.

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Section: Process and Methods Of Dispersion Technologymentioning

confidence: 99%

Smart cement‐sensor composite: The evolution of nanomaterial in developing sensor for structural integrity

Kanagasundaram

Elavenil

2023

Structural Concrete

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“…The multi-walled CNTs, having a specific gravity, diameter, and length of 1.32, 10–40 nm, and 10 μm, respectively, were received from Hyosung Inc. (Seoul, Korea). The CNTs showed the presence of a defect or carbonaceous compounds in Raman spectra [ 24 ]. The acetone was procured from Carlo Erba Reagents.…”

Section: Methodsmentioning

confidence: 99%

Electrical Stability and Piezoresistive Sensing Performance of High Strain-Range Ultra-Stretchable CNT-Embedded Sensors

et al. 2022

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Highly flexible and stretchable sensors are becoming increasingly widespread due to their versatile applicability in human/robot monitoring sensors. Conductive polymeric composites have been regarded as potential candidates for such sensors, and carbon nanotubes (CNTs) are widely used to fabricate such composites. In the present study, CNT-embedded high flexible sensors were fabricated using a facile three-roll milling method, which mitigates the drawbacks of the conventional fabrication methods. CNTs content varied between 0.5 and 4.0 wt.%, and the percolation threshold range was obtained via conductivity/resistivity values of the fabricated sensors. Following this, the electrical stability of the sensors was examined against the various DC and AC signals. Furthermore, the fabricated sensors were stretched up to 500% strain, and their sensitivity against varying strain amplitudes was investigated in terms of the change in resistance and gauge factors. Lastly, the fabricated sensors were applied to human fingers for monitoring finger bending and releasing motions to validate their potential applications. The experimental results indicated that these sensors have a percolation threshold of around 2% CNTs content, and the sensors fabricated with 2 to 4% CNTs content showed measurable resistance changes against the applied strain amplitudes of 50–500%. Among these sensors, the sensor with 2% CNTs content showed the highest sensitivity in the studied strain range, exhibiting a resistance change and gauge factor of about 90% and 1.79 against 50% strain amplitude and about 18,500% and 37.07 against 500% strain amplitude, respectively. All these sensors also showed high sensitivity for finger motion detection, showing a resistance change of between 22 and 69%.

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“…This was shown as an effective way of dispersing CNTs into PVDF with polyvinylpyrrolidone (PVP) being used as the plasticizer. [ 192 ] Kim et al [ 193 ] discovered that, in PP/CNT composites produced by solvent casting, CNTs were positively charged in xylene but, when a polycarboxylate‐type superplasticizer was added, the zeta potential became negative. This enabled the superplasticizer to wrap around the CNTs and induce repulsion between CNTs.…”

Section: Carbonaceous Fillersmentioning

confidence: 99%

Emerging Research in Conductive Materials for Fused Filament Fabrication: A Critical Review

Simunec¹,

Sola²

2022

Adv Eng Mater

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The progress of Industry 4.0 and the advancement of robotic design are revealing a significant gap in the capabilities of current manufacturing techniques and the selection of materials that are available in electronics. Present‐day electrical systems largely rely on metals, but there is a driving need to develop new electrically conductive objects with a wide range of material properties, including expanded flexibility and softness, and with increasingly complex geometries. Electrically conductive composites can replace traditional metal‐based systems. In particular, thermoplastic composites become electrically conductive with the incorporation of conductive fillers or polymers while retaining to a large extent the processability of the thermoplastic matrix. This is where fused filament fabrication (FFF), an additive manufacturing (AM) technique capable of processing a variety of thermoplastic‐matrix feedstock materials, can be leveraged to create electrically conductive objects with new functionalities. While there is an increasing number of publications describing the FFF of electrical objects such as sensors and circuits, there is no comprehensive review outlining the functioning mechanisms, drawbacks, and advantages of FFF as applied to conductive materials. The present review fills this lacuna by offering a critical analysis of the specific challenges and solutions to promote FFF of electrically conductive polymers and composites.

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A novel physicomechanical approach to dispersion of carbon nanotubes in polypropylene composites

Cited by 26 publications

References 39 publications

Smart cement‐sensor composite: The evolution of nanomaterial in developing sensor for structural integrity

Smart cement‐sensor composite: The evolution of nanomaterial in developing sensor for structural integrity

Electrical Stability and Piezoresistive Sensing Performance of High Strain-Range Ultra-Stretchable CNT-Embedded Sensors

Emerging Research in Conductive Materials for Fused Filament Fabrication: A Critical Review

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