TC Study of Manufacturable Nano Grease: Evidence of 3D Network Structure

Younes, Hammad; Christensen, Greg; Horton, Mark; Ghaferi, Amal Al; Hong, Haiping; Qiang, Yinhuai

doi:10.1007/s41871-018-0018-7

Cited by 7 publications

(4 citation statements)

References 19 publications

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“…This finding was attributed to the strong 3D percolation network structure that is created by the CNTs, which is strong enough to prevent the magnetic field from pulling the tubes away from each other to align the CNTs that is responsible for improving thermal conductivity, as reported in the literature [7,[26][27][28]. These interesting results have opened the door for a comprehensive study of the thermal conductivity of manufacturable nanogrease [5]. In this study, the thermal conductivity of CNT grease under different concentrations and various magnetic field strengths has been measured.…”

Section: Detailed Discussion About Grease Developmentmentioning

confidence: 53%

“…In many cases, nanotubes are highly tangled, and immense effort must be used to disperse them and make use of their extraordinary properties in a variety of applications, such as grease. Grease is a soft solid or semifluid lubricating material that consists of oil or other fluid mixed with a thickener, the latter usually being metallic stearate [5]. Greases are usually named after their functions or where they are applied, e.g., thermal and wheelbearing greases.…”

Section: Introductionmentioning

confidence: 99%

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Manufacturable Novel Nanogrease with Superb Physical Properties

et al. 2021

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High-performance nanogrease manufactured from carbon nanomaterials is observed to be stable and homogeneous and have superb physical properties, such as thermal and electrical conductivities, compared with current commercial greases made of lithium, calcium, and aluminum. For the first time, carbon nanomaterials have been observed to disperse well as the sole thickeners in oil systems, e.g., polyalphaolefin and polyester (ROYCO), without the aid of any chemical surfactants. Three-dimensional percolation network structures that exist among carbon nanomaterials are easily scalable, which can be attributed to the intermolecular van der Waals forces. Moreover, the introduction of hydrogen bonding in any form to grease significantly increases its thermal and electrical conductivities and substantially reduces the weight percentage of carbon nanomaterials needed to fabricate stable grease. For example, loading of only 1.4 wt% hydroxyl-functionalized multiwalled carbon nanotube (MWNT-OH) with Krytox XHT750 oil leads to a 37.8% increase in thermal conductivity. Moreover, 75% glycerol, 25% water, and 4.5 wt% MWNT-OH yielded the lowest electrical resistivity of 10.0 Ω cm. This finding can be extended to hydrogen bonding materials with functional groups, such as OH, COOH, F, and NH. The nanogrease reported in this study has been manufactured using the three-roll mill method, which is an easy and cost-effective method, as the loading weight percentage of carbon nanomaterials to fabricate stable grease decreases from 12 wt% to 3-4 wt%. Furthermore, the process is easily scalable, reproduced, and optimized. This novel high-performance nanogrease has a high commercial value and numerous applications and could replace current commercial greases.

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Section: Detailed Discussion About Grease Developmentmentioning

confidence: 53%

Section: Introductionmentioning

confidence: 99%

Manufacturable Novel Nanogrease with Superb Physical Properties

et al. 2021

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“…In addition, this study demonstrated that the attachment of the iron oxide at the outer face of the CNTs prevents the formation of the 3D network structure [37]. Furthermore, the results indicate that the TC for SWNTs grease at 10 wt% has not changed regardless of the strength of the magnetic field or its application duration time, because of the strong Van der Waals forces between the SWNTs, which hinder movement and resist the magnetic field [43] ( Fig. 10).…”

Section: Lubricants and Nanogreasementioning

confidence: 79%

A Novel Approach to Fabricate Carbon Nanomaterials–Nanoparticle Solids through Aqueous Solutions and Their Applications

2021

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A better understanding of the bonding and aggregation processes occurring between carbon nanomaterials and metal oxide particles in aqueous solutions is important in the development of novel nanosolids for applications in the areas of sensor development, highly conductive paint, nanotube alignment, polymer composites, Li-ion batteries, and many other areas. The current investigation reviews these processes and presents a detailed description of the aggregation processes occurring between carbon nanomaterials and metal oxide particles (metals) in various aqueous solutions. The results indicate that the charge attraction between the particles results in a strong homogeneous bonding that occurs within the aqueous solution and for the first time demonstrate and describe the aggregation process of these nanoparticles. The relative importance of many parameters that impact the aggregation process is identified and discussed, and guidelines for controlling the aggregation process are presented. This is a simple and cost-effective process to manufacture a novel nano-solid based on carbon nano-material and metal oxide. In addition, the process is easy to scale up and optimize. The methodology could lead to many significant applications as well as commercialization.

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“…This stability and homogeneity of the fabricated grease was ascribed to the formation of the 3D network formation that the carbon nanomaterials can make. Moreover, the fabricated CNTs grease had a high thermal conductivity [11,21]. Christensen et al also examined the impact of using carbon nanofibers in the thermal and electrical conductivity of grease.…”

Section: Introductionmentioning

confidence: 99%

CPU Performance Improvement Using Novel Thermally Conductive Carbon Nano Grease

Grablander¹,

Christensen²,

Bailey³

et al. 2022

Lubricants

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Electronics depend on their ability to shed operational heat to maintain operating temperature. Inferior grease can create preventable problems in electronics. This is typically achieved through a thermal grease or paste. If this grease fails to dissipate heat or maintain thermal contact, then the equipment will have faults. Greases with less-than-optimal performance create excessive wear, heat, and reduced life expectancy. This can cause equipment failures and malfunctions at the most inopportune moments. Thermal greases are applied to Central Processors (CPU) and Graphics Processors (GPU) in avionics LRUs, computers, Solar panels, HVAC systems, and other electronics. A high-performance novel nano grease will shed excess heat and increase device life expectancy. The fabricated nano greases show improvements of up to 80% in thermal conductivity measurements. CPU testing resulted in a 100% decrease in the standard deviation of temperature variation from commercial greases.

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TC Study of Manufacturable Nano Grease: Evidence of 3D Network Structure

Cited by 7 publications

References 19 publications

Manufacturable Novel Nanogrease with Superb Physical Properties

Manufacturable Novel Nanogrease with Superb Physical Properties

A Novel Approach to Fabricate Carbon Nanomaterials–Nanoparticle Solids through Aqueous Solutions and Their Applications

CPU Performance Improvement Using Novel Thermally Conductive Carbon Nano Grease

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