On the lack of thermal percolation in carbon nanotube composites

Shenogina, Natalia; Shenogin, Sergei; Xue, Liping; Keblinski, Pawel

doi:10.1063/1.2056591

Cited by 236 publications

(173 citation statements)

References 13 publications

(13 reference statements)

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“…9,21 The absence of a significant increase in thermal conductivity at low loadings is attributed to the modest difference of the constituent thermal conductivities and the large interfacial thermal resistance between the polymer matrix and SWNT, as previously described. 11,22 Weak thermal coupling between the SWNT and polymers causes large interfacial thermal resistance.…”

Section: Resultsmentioning

confidence: 99%

Single Wall Carbon Nanotube/Polyethylene Nanocomposites: Nucleating and Templating Polyethylene Crystallites

2006

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The thermal and electrical conductivities in nanocomposites of single walled carbon nanotubes (SWNT) and polyethylene (PE) are investigated in terms of SWNT loading, the degree of PE crystallinity, and the PE alignment. Isotropic SWNT/PE nanocomposites show a significant increase in thermal conductivity with increasing SWNT loading, having 1.8 and 3.5 W/mK at a SWNT volume fraction of φ ∼ 0.2 in low-density PE (LDPE) and high-density PE (HDPE), respectively. This increase in SWNT/HDPE is more than additive and suggests a reduction of the interfacial thermal resistance. Fitting the thermal conductivity data of the SWNT/ HDPE nanocomposites with two models indicates that the thermal conductivity relies on a percolating SWNT network. Oriented SWNT/HDPE nanocomposites exhibit higher thermal conductivities, which are attributed primarily to the aligned PE matrix.

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Section: Resultsmentioning

confidence: 99%

Single Wall Carbon Nanotube/Polyethylene Nanocomposites: Nucleating and Templating Polyethylene Crystallites

2006

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“…The large TBR at CNT/matrix interface can be attributed to the fundamental property -high Kapitza resistance [18] between one-dimensional (1D) CNTs and 3D bulk owing to the large difference in the phonon density of states (DOS). It was also suggested that the lack of thermal percolation in CNT composites can negatively affect their heat conduction properties [19]. Interestingly, the electrical percolation thresholds f T for CNT composites are very low, f~0.1 vol.…”

Section: Figurementioning

confidence: 99%

Graphene–Multilayer Graphene Nanocomposites as Highly Efficient Thermal Interface Materials

2012

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We found that an optimized mixture of graphene and multilayer graphene -produced by the high-yield inexpensive liquid-phase-exfoliation technique -can lead to an extremely strong enhancement of the cross-plane thermal conductivity K of the composite. The "laser flash" measurements revealed a record-high enhancement of K by 2300 % in the graphene-based polymer at the filler loading fraction f =10 vol. %. It was determined that a relatively high concentration of single-layer and bilayer graphene flakes (~10-15%) present simultaneously with thicker multilayers of large lateral size (~ 1 m) were essential for the observed unusual K enhancement. The thermal conductivity of a commercial thermal grease was increased from an initial value of ~5.8 W/mK to K=14 W/mK at the small loading f=2%, which preserved all mechanical properties of the hybrid. Our modeling results suggest that graphene -multilayer graphene nanocomposite used as the thermal interface material outperforms those with carbon nanotubes or metal nanoparticles owing to graphene's aspect ratio and lower Kapitza resistance at the graphene -matrix interface.

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“…Presence of adsorbed polymer layers around the fillers prevent the formation of percolation network and filler-filler phonon transfer. Even if the fillers are in direct contact with each other, due to their [292] small contact area, the matrix and its interfacial resistance play a key role in heat transfer [272].…”

Section: Thermal Conductivitymentioning

confidence: 99%

A review on the role of interface in mechanical, thermal, and electrical properties of polymer composites

Kashfipour

Mehra

Zhu

2018

Adv Compos Hybrid Mater

163

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Composite materials and especially polymer composites are widely used in daily life and different industries due to their vastly different properties and design flexibility. It is known that the properties of the composites are strongly related to the properties of its constituents. However, it has been reported in many studies, experimentally and by simulations, that the characteristics of the composites do not follow the rule of mixing. It means that in addition to properties of the constituents, there are other parameters affecting the final physicochemical properties of composites. The interfacial interactions between fillers and host is one of the factors which can strongly affect the properties of the composite. In this review, we summarized the type of interactions between the constituents, their improvement techniques, interaction measurement methods, and the effects of interfacial interactions on thermal, mechanical, and electrical properties of composites.

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On the lack of thermal percolation in carbon nanotube composites

Cited by 236 publications

References 13 publications

Single Wall Carbon Nanotube/Polyethylene Nanocomposites: Nucleating and Templating Polyethylene Crystallites

Single Wall Carbon Nanotube/Polyethylene Nanocomposites: Nucleating and Templating Polyethylene Crystallites

Graphene–Multilayer Graphene Nanocomposites as Highly Efficient Thermal Interface Materials

A review on the role of interface in mechanical, thermal, and electrical properties of polymer composites

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