Superior thermal transport properties of vertically aligned carbon nanotubes tailored through mesoscale architectures

Chawla, Komal; Cai, Jizhe; Thompson, Dakotah; Thevamaran, Ramathasan

doi:10.1016/j.carbon.2023.118526

Cited by 10 publications

(2 citation statements)

References 62 publications

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“…Replacing or supplementing this foam with MWCNT composite elements could allow lighter, slimmer, and more durable pads and helmets to be produced without sacrificing cushioning performance [17,18]. For example, CHAWLA et al [19] fabricated MWCNT/polyurethane composite foam which showed increased compressive strength and energy absorption compared to pure polyurethane foam. The stiffness and abrasion resistance of current outer shell materials like plastic and leather could also potentially be improved by CNT composites.…”

Section: Introductionmentioning

confidence: 99%

Optimizing mechanical properties of multi-walled carbon nanotube reinforced thermoplastic polyurethane composites for advanced athletic protective gear

2024

Matéria (Rio J.)

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This study investigates the mechanical properties of thermoplastic polyurethane (TPU) composites reinforced with multi-walled carbon nanotubes (MWCNTs) for application in athletic protective gear. The objectives were to (1) systematically evaluate the effects of MWCNT loading level and alignment on the tensile, compressive, hardness, and impact properties; (2) identify an optimal MWCNT content range for balanced enhancements; and (3) explore scalable fabrication methods. MWCNT/TPU composites with 0.5-4 wt% loading were prepared by solution mixing and compression molding. Mechanical testing revealed significant improvements, with 62 MPa tensile strength (+19%), 507 MPa modulus (+23%), and 10% higher impact energy absorption achieved at 1-4 wt% MWCNT. MWCNT alignment further enhanced the properties, while loadings above 2 wt% showed some embrittlement. Microstructural characterization evidenced good MWCNT dispersion and interfacial bonding. The results demonstrate that low MWCNT additions can substantially enhance the strength, stiffness, and impact resistance of TPU. This indicates great potential for developing advanced, lightweight athletic protective equipment like helmets and pads with improved energy absorption and durability. Future work will focus on optimizing composite processing and design for specific gear applications.

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Section: Introductionmentioning

confidence: 99%

Optimizing mechanical properties of multi-walled carbon nanotube reinforced thermoplastic polyurethane composites for advanced athletic protective gear

2024

Matéria (Rio J.)

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“…Graphene, boron nitride, and their derivatives, including carbon nanotubes (CNTs) and boron nitride nanotubes (BNNTs), have emerged as promising thermal interface materials for micro- and nanoelectronic devices . These materials are highly valued for their exceptional thermal conductivity, , chemical stability, , and hardness and stiffness. , In addition, these materials have some other interesting properties. For example, a CNT can also be used as a carrier for anticancer drugs such as doxorubicin (DOX), thereby improving the drug delivery efficiency in the body and reducing damage to noncancerous cells. − Borophene nanolayers are considered to be ideal candidates for the next generation of lithium-ion battery negative electrode materials due to their excellent specific capacity and superior conductivity .…”

Section: Introductionmentioning

confidence: 99%

Thermal Rectification in Graphene–Boron Nitride Nanotube Hybrid Structures: An Independent Control Mechanism for Forward and Backward Heat Flux

Wu,

Liu,

Wang

et al. 2024

ACS Appl. Mater. Interfaces

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The weak van der Waals interactions in the out-ofplane direction result in markedly low thermal conductivity in onedimensional (1D) and two-dimensional (2D) materials, which substantially restricts their applications. Developing three-dimensional (3D) columnar hybrid structures, featuring high thermal conductivity both within and beyond the plane, effectively addresses this challenge. This study investigated a 3D hybrid structure composed of graphene and boron nitride nanotubes (GR-BNNTs) using non-equilibrium molecular dynamics simulations. This approach allowed the examination of the formation mechanisms and key factors influencing thermal rectification (TR) in these materials. Our findings reveal a novel mechanism for independently regulating forward and backward heat fluxes in GR-BNNTs. By manipulating the thermal properties of the BNNTs and the graphene layer, the TR ratio can be controlled flexibly. Additionally, we identify specific strategies for independently adjusting the heat flux, such as altering the intercolumn distance of BNNTs, which impacts the backward flux merely, while applying strain to affect the forward flux merely. This research introduces a novel concept of independent regulation of forward and backward heat fluxes, providing significant insights into phonon thermal transport in 3D hybrid structures.

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Review on functionalized CNTs reinforced silicone rubber composites for potential wearable applications

Kumar,

Alam,

Park

2024

Polymer Composites

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Wearable technology refers to the devices that are integrated with textiles, or implanted in the body or plants for smart monitoring. Hence, this wearable technology has attracted tremendous attention from researchers globally due to its smart functions to be useful for mankind. The key target of this review is to examine the potential of rubber composite materials for such wearable devices. The rubber composites reviewed explore silicone rubber as a rubber matrix (SR). Another objective includes the use of multi‐walled carbon nanotubes (MWCNTs) in pristine and functionalization forms explored as reinforcing fillers. Moreover, prospects of CNT including their structure, properties, and types are explored both in pristine and functionalized state are reviewed. Following this, the mechanical, and electrical, properties of such composites are reviewed. The reported results show that the reinforcing properties are strongly improved by adding functional groups to CNT in rubber composite. These improvements in reinforcing properties are assisted by the functional groups like carboxyl (OH), carbonyl (CO), epoxy, and alkoxy (CO) on the surface of filler are useful. They assist in improving the filler‐rubber compatibility thereby improving filler dispersion and thus finally mechanical and electrical properties. Following this, such improved properties are explored for specific real‐time wearable technologies. This real‐time monitoring includes nursing plant pulse growth monitoring, health monitoring, and humidity sensors. The review further proposes that the functionalized CNTs can be useful for obtaining robust real‐time strain‐sensing monitoring. Moreover, it assists in obtaining sharp response time, strain sensitivity, and good stretchability. Finally, the prospects and challenges are explored discussing the real‐time monitoring of these sensors.Highlights Configurations for nursing plant growth and other monitoring parameters are reviewed. The properties of pristine and functionalized carbon nanotubes reinforced silicone rubber for wearable technology were reviewed. The mechanical, and electrical aspects of functionalized carbon nanotubes were comparatively reviewed. Applications such as wearable strain sensors, humidity sensors, and wearable plant pulse monitoring sensors were reported.

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Superior thermal transport properties of vertically aligned carbon nanotubes tailored through mesoscale architectures

Cited by 10 publications

References 62 publications

Optimizing mechanical properties of multi-walled carbon nanotube reinforced thermoplastic polyurethane composites for advanced athletic protective gear

Optimizing mechanical properties of multi-walled carbon nanotube reinforced thermoplastic polyurethane composites for advanced athletic protective gear

Thermal Rectification in Graphene–Boron Nitride Nanotube Hybrid Structures: An Independent Control Mechanism for Forward and Backward Heat Flux

Review on functionalized CNTs reinforced silicone rubber composites for potential wearable applications

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