Hydrogen bonding enhanced thermally conductive carbon nano grease

Christensen, Greg; Younes, Hammad; Hong, George; Lou, Ding; Hong, Haiping; Widener, Christian; Bailey, Craig D. C.; Hrabe, Rob

doi:10.1016/j.synthmet.2019.116213

Cited by 24 publications

(15 citation statements)

References 16 publications

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“…Christensen et al also investigated the TC of CNT grease [31]. They reported approximately 545.9% improvement in the TC of the grease over the base oil using 12 wt% CNFs with NYE blank grease.…”

Section: Detailed Discussion About Grease Developmentmentioning

confidence: 99%

“…Reprinted with permission from Ref. [31] Base oil Carbon material Carbon (wt%) Thermal conductivity (W/mK) Thermal conductivity percent increase (%) outperform the nanotubes, a mixture of the two can obtain good results. Figure 9 shows pictures of two grease samples.…”

Section: Detailed Discussion About Grease Developmentmentioning

confidence: 99%

“…Moreover, the effect of adding Reprinted with permission from Ref. [31] Fig. 10 Wear rates of three materials under PAO/CNT lubrication conditions with 220 N and 520 N loads.…”

Section: Future Work and Commercial Applicationmentioning

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: 99%

Section: Detailed Discussion About Grease Developmentmentioning

confidence: 99%

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Manufacturable Novel Nanogrease with Superb Physical Properties

et al. 2021

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“…Nanogrease is another important application for the aggregated nanoparticle CNTs. Several publications have appeared in recent years discussing the fabrication of nanogreases using aggregated nanoparticle CNTs with high thermal and electrical conductivity properties [33][34][35][36][37][38][39][40][41][42]. A study by Younes et al concluded that SWNTs form a strong 3D net structure because of the strong Van der Waals forces and this is the main reason behind the creation of stable SWNT nanogrease, as shown in Fig.…”

Section: Lubricants and Nanogreasementioning

confidence: 99%

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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“…Among them, thermal silicone grease (TSG) is a widely used thermally conductive composite interface material, which can maintain a semi-solid state at 200 • C and above, and maintain chemical stability for a long time. According to personal needs, the addition of additives into TSG can also make it conductive, insulating or flame retardant [6,7]. At the same time, the TSGs have no specific material composition and ratio; Han et al…”

Section: Introductionmentioning

confidence: 99%

Preparation of Binary Thermal Silicone Grease and Its Application in Battery Thermal Management

Liu¹,

Huang²,

Cao³

et al. 2020

Materials

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To improve the problems of large interface thermal resistance and low heat dissipation efficiency in battery thermal management (BTM), this paper uses methyl silicone oil as the matrix, AIN, copper powder (CP), and carbon fiber (CF) as thermally conductive fillers, and acetone and stearic acid as particle surface modification components. A variety of binary thermal silicone greases (TSGs) with different compositions were prepared. Different instruments were used to test the material properties of TSGs, and a better TSG was selected to coat the interface between battery and phase change material (PCM) for battery charging and discharging experiments. Through the analysis of experimental data, it was found that among the TSGs made of three mixed fillers (AIN/CP, AIN/CF, CP/CF), the three TSGs had good thermal stability, and their thermal degradation temperature both exceeded 300 °C. As the ratio of thermally conductive filler was gradually changed from 5:1 to 1:5, the TSG containing CP/CF had higher thermal conductivity and lower volume resistivity, while the TSG containing AIN/CF had the least damage due to interface wear. The acidification treatment of thermally conductive filler can improve the adsorption and compatibility of thermally conductive particles and silicone oil, and reduce the oil separation rate of TSGs. The prepared expanded graphite (EG)/paraffin wax (PW) composite phase change material (CPCM) has a relatively large latent heat of phase change, which can effectively control the temperature of the battery, but coating TSG between the battery and the CPCM can further enhance the heat dissipation effect of the battery.

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Hydrogen bonding enhanced thermally conductive carbon nano grease

Cited by 24 publications

References 16 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

Preparation of Binary Thermal Silicone Grease and Its Application in Battery Thermal Management

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