Improved Thermal Response in Encapsulated Phase Change Materials by Nanotube Attachment on Encapsulating Solid

Barney, Ian T.; Ganguli, Sabyasachi; Roy, Ajit K.; Mukhopadhyay, Sharmila M.

doi:10.1115/1.4007327

Cited by 9 publications

(2 citation statements)

References 18 publications

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“…CNTs offer several advantages as NP supports and several earlier studies have discussed the influence of the physical and chemical nature of various support structures on advanced applications [4]. The CNT-enhanced substrates reported by our group have proved to be useful for several applications such as nanocomposite formation [5], surface adsorption [6], cell scaffolding [7], thermal management materials [8] in addition to support for metallic NPs [9][10][11].…”

Section: Introductionmentioning

confidence: 80%

Silver nanoparticles supported on carbon nanotube carpets: influence of surface functionalization

et al. 2016

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The effectiveness of nanoparticle-based functional devices depends strongly on the surface morphology and area of the support. An emerging powerful approach of increasing the available surface area without decreasing strength or increasing bulk is to attach arrays of suitable nanotubes on the surface, and to attach the necessary nanoparticles to them. Earlier publications by this team have shown that carpet-like arrays of carbon nanotubes (CNT) can be successfully grown on a variety of larger carbon substrates such as graphite, foams and fabric, which offer hierarchical multiscale supporting architecture suitable for the attachment of silver nanoparticles (AgNPs). A limiting factor of pure CNT arrays in fluid-based applications is their hydrophobicity, which can reduce the percolation of an aqueous medium through individual nanotubes. Previous studies have demonstrated that the treatment of CNT carpets with dry (oxygen) plasma can induce reversible wettability, and treatment with wet (sol-gel) coating can impart permanent wettability. In this paper, we report the influence of such treatments on the attachment of AgNPs, and their effectiveness in water disinfection treatments. Both types of hydrophilic surface treatments show an increase in silver loading on the CNT carpets. Oxygenplasma treated surfaces (O-CNTs) show fine and densely packed AgNP, whereas silica-coated nanotubes (silica-CNTs) show uneven clusters of AgNPs. However, O-CNT surfaces lose their hydrophilicity during AgNP deposition, whereas silica-CNT surfaces remain hydrophilic. This difference significantly impacts the antibacterial effectiveness of these materials, as tested in simulated water containing Gram negative Escherichia coli (E. coli, JM109). AgNPs on silicacoated CNT substrates showed significantly higher reduction rates of E. coli compared to AgNPs on plasma-treated CNT substrates, despite the finer and better dispersed AgNP distribution in the latter. These results provide important insights into different aspects of surface modification approaches that can control the wettability of CNT carpets, and their applicability in water treatment applications.

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Section: Introductionmentioning

confidence: 80%

Silver nanoparticles supported on carbon nanotube carpets: influence of surface functionalization

et al. 2016

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“…Others have reported values of 27 W/m-K with the addition of a metallized bonding layer on the CNT array [30]. More recently, studies have reported success with growing CNT arrays on graphite substrates [2,[33][34][35]. It has also been suggested that three-dimensional structures consisting of CNTs joined perpendicular to graphite may be suitable as a high-performance TIM [2].…”

Section: Introductionmentioning

confidence: 99%

Aligned Carbon Nanotube Arrays Bonded to Solid Graphite Substrates: Thermal Analysis for Future Device Cooling Applications

Quinton

Elston

Scofield

et al. 2018

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Carbon nanotubes (CNTs) are known for high thermal conductivity and have potential use as nano-radiators or heat exchangers. This paper focuses on the thermal performance of carpet-like arrays of vertically aligned CNTs on solid graphite substrates with the idea of investigating their behavior as a function of carpet dimensions and predicting their performance as thermal interface material (TIM) for electronic device cooling. Vertically aligned CNTs were grown on highly oriented pyrolytic graphite (HOPG) substrate, which creates a robust and durable all-carbon hierarchical structure. The multi-layer thermal analysis approach using Netzsch laser flash analysis system was used to evaluate their performance as a function of carpet height, from which their thermal properties can be determined. It was seen that the thermal resistance of the CNT array varies linearly with CNT carpet height, providing a unique way of decoupling the properties of the CNT carpet from its interface. This data was used to estimate the thermal conductivity of individual multi-walled nanotube strands in this carpet, which was about 35 W/m-K. The influence of CNT carpet parameters (aerial density, diameter, and length) on thermal resistance of the CNT carpet and its potential advantages and limitations as an integrated TIM are discussed.

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Comparison of Thermal Characteristics of Sensible and Latent Heat Storage Materials Encapsulated in Different Capsule Configurations

Muthukumar

Niyas

2017

Springer Proceedings in Energy

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Improved Thermal Response in Encapsulated Phase Change Materials by Nanotube Attachment on Encapsulating Solid

Cited by 9 publications

References 18 publications

Silver nanoparticles supported on carbon nanotube carpets: influence of surface functionalization

Silver nanoparticles supported on carbon nanotube carpets: influence of surface functionalization

Aligned Carbon Nanotube Arrays Bonded to Solid Graphite Substrates: Thermal Analysis for Future Device Cooling Applications

Comparison of Thermal Characteristics of Sensible and Latent Heat Storage Materials Encapsulated in Different Capsule Configurations

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