Thermal Conductivity of Single-Wall Carbon Nanotube Dispersions:  Role of Interfacial Effects

Nanda, Jagjit; Maranville, Clay; Bollin, Shannon C.; Sawall, Dustyn D.; Ohtani, H.; Remillard, J. T.; Ginder, J. M.

doi:10.1021/jp711164h

Cited by 92 publications

(42 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Using the above equation and considering the experimentally measured thermal conductivity of the S-90 based nanocomposite, K c 5 0.143 W/mK, and b 5 115, d 5 13 nm and K f 5225 W=mK, the interfacial resistance in this sample is calculated as R k 51 310 29 m 2 K/W, which is in good agreement with the values reported in literature [28,41]. Therefore, with increasing sonication time, the interfacial area between nanotubes and surrounding matrix will be dramatically increased, resulting in higher interfacial thermal resistance and hence the lower thermal conductivity.…”

Section: Morphology and Thermal Conductivity Of Tpu/cnt Nanocompositessupporting

confidence: 88%

Effect of carbon nanotube dispersion and network formation on thermal conductivity of thermoplastic polyurethane/carbon nanotube nanocomposites

Pircheraghi

Powell

Bonab

et al. 2016

Polymer Engineering & Sci

View full text Add to dashboard Cite

Carbon nanotubes (CNTs) were dispersed without any solvent in poly(tetramethylene ether glycol), (PTMEG) well above its melting point by ultrasonication in the pulse mode and different times. The polyol/CNT suspensions were used to prepare in situ polymerized thermoplastic polyurethane TPU/CNT nanocomposites with the CNT concentration of $ 0.05 vol%, much below the CNT geometrical percolation threshold calculated at 0.43 vol%. Results of rotational rheological measurements and ultraviolet-visible (UV-Vis) spectroscopy analysis revealed improvement in the nanoscale CNT dispersion with sonication time. Moreover, the optical microscopic images and sedimentation behavior for these samples pointed out to the formation of segregated CNT networks with different microstructures at different sonication times. Through-plane thermal conductivity measurements showed an increase in thermal conductivity of the in situ polymerized TPU/CNT nanocomposites from polyol/CNT suspensions with increasing sonication time followed by a decrease at long sonication times. Different models were used to evaluate the role of CNT dispersion state and created microstructure on thermal conductivity of nanocomposites. The formation of a segregated network at medium sonication times consisting of large CNT aggregates and small bundles increased the nanocomposite thermal conductivity up to 99.7%, while at longer sonication times, an increase in interfacial area with a corresponding increase in kapitza boundary resistance, effectively decreased the system thermal conductivity. POLYM. ENG. SCI.,

show abstract

Section: Morphology and Thermal Conductivity Of Tpu/cnt Nanocompositessupporting

confidence: 88%

Effect of carbon nanotube dispersion and network formation on thermal conductivity of thermoplastic polyurethane/carbon nanotube nanocomposites

Pircheraghi

Powell

Bonab

et al. 2016

Polymer Engineering & Sci

View full text Add to dashboard Cite

show abstract

“…22 Our results show the unique possibility of tuning the ratio of k eff / eff in magnetically controllable nanofluids making them superior to carbon nanotubes based suspensions ͑in terms of reversible tunability͒ for heat transport applications. [23][24][25] Further, our finding shows that magnetically controllable nanofluids can behave like a multifunctional "smart" material that can remove heat and also arrest vibrations ͑act as a damper͒ offering exciting applications in microfluidic devices, MEMS and NEMS, and other nanotechnology based miniature devices.…”

mentioning

confidence: 75%

Magnetically controllable nanofluid with tunable thermal conductivity and viscosity

Shima

Philip

Raj

2009

Applied Physics Letters

124

View full text Add to dashboard Cite

We report the viscosity (η) and thermal conductivity (k) enhancement in a stable magnetic nanofluid containing particles size <10 nm as a function of volume fraction (vol %), shear rate, magnetic field, and time. Without field, the η enhancement of nanoparticle is much larger than that of k. In a nanofluid with 0.078 vol %, the k/η ratio is tunable from 0.725 to 2.35 by controlling the applied field. Our results show that magnetic nanofluids with tunable k/η ratio can be used as multifunctional “smart materials” for miniature cooling cum damping applications.

show abstract

“…As a reference, thermal boundary conductance at the interface of Au/Pd alloy nanoparticle covered with alkanethiol SAM and toluene solvent was measured experimentally and was reported to be 15 MW/ ͑m 2 K͒. 25 In order to discuss the significant difference from the present MD results, the effects of surface curvature of the nanoparticle, a SAM coverage, and an ordering structure of SAM on the thermal boundary conductance have to be investigated. These are currently unclear.…”

Section: B Thermal Boundary Resistancementioning

confidence: 98%

“…[22][23][24] One important factor influencing the effective thermal conductivity is thermal boundary resistance at the particle-solvent interface particularly for the high aspheric particles such as carbon nanotubes. 25 SAM modification is used especially at the metal nanoparticle surfaces in order to inhibit agglomeration of the particles. Therefore, the investigation of the interfacial heat transfer characteristics of SAM interfaces is a critical issue.…”

Section: Introductionmentioning

confidence: 99%

A molecular dynamics study on heat transfer characteristics at the interfaces of alkanethiolate self-assembled monolayer and organic solvent

Kikugawa

Ohara

Kawaguchi

et al. 2009

The Journal of Chemical Physics

View full text Add to dashboard Cite

In this paper, we present molecular dynamics (MD) simulations of interfaces composed of self-assembled monolayers (SAMs) and solvents in order to investigate the heat transfer characteristics at the interface. Two typical normal alkylthiolate SAMs with different chain lengths, i.e., 1-propanethiol C(3)H(7)SH and 1-dodecanethiol (C(12)H(25)SH) chemically adsorbed on Au(111) substrate surfaces, were used, and toluene was adopted as the organic solvent. In addition to the SAM systems, an interface composed of the bare solid substrate and solvent (without SAMs) was analyzed for comparison. Nonequilibrium MD simulations, in which a temperature gradient perpendicular to the interface was imposed, were performed and the difference in thermal boundary resistance in the interface systems was discussed. We observed that the SAM interfaces have smaller thermal resistance when compared with that of the bare solid interface. In order to understand the mechanisms of the small resistance at the SAM-solvent interfaces, the vibrational character of molecules in each phase, which contacted each other at the interface was analyzed and a detailed adsorbed structure of solvent molecule in the interface region was extracted. As a result, a clear difference in these characters was found between the SAM interfaces and bare solid interface.

show abstract

Thermal Conductivity of Single-Wall Carbon Nanotube Dispersions: Role of Interfacial Effects

Cited by 92 publications

References 27 publications

Effect of carbon nanotube dispersion and network formation on thermal conductivity of thermoplastic polyurethane/carbon nanotube nanocomposites

Effect of carbon nanotube dispersion and network formation on thermal conductivity of thermoplastic polyurethane/carbon nanotube nanocomposites

Magnetically controllable nanofluid with tunable thermal conductivity and viscosity

A molecular dynamics study on heat transfer characteristics at the interfaces of alkanethiolate self-assembled monolayer and organic solvent

Contact Info

Product

Resources

About