| 11. |
- Hu, Zhili, 1983, et al.
(author)
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The Effect of Boundary Conditions on a Theoretical Analysis of Axial Buckling in a Chiral Single-Wall Carbon Nanotube
- 2010
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In: Journal of Computational and Theoretical Nanoscience. - : American Scientific Publishers. - 1546-1955 .- 1546-1963. ; 7:11, s. 2401-2404
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Journal article (peer-reviewed)abstract
- Using molecular dynamics simulation, we predict that under fixed-end boundary condition, for an unsymmetrical chiral single-wall carbon nanotubes (SWCNTs), helix-like stripes would appear on the nanotube shell, and torsional buckling could occur. At the same time, buckling critical strains would be greatly reduce (e.g., similar to 20% for a (8,3) SWCNT) compared with those under simply supported boundary conditions. The mechanism for this decrease is not understood.
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| 12. |
- Hu, Zhili, 1983, et al.
(author)
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The effect of modulus on the performance of thermal conductive adhesives
- 2010
-
In: Proceedings - 2010 11th International Conference on Electronic Packaging Technology and High Density Packaging, ICEPT-HDP 2010; Xi'an; 16 August 2010 through 19 August 2010. - 9781424481422 ; :Article number 5582884, s. 648-651
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Conference paper (peer-reviewed)abstract
- By analyzing the effect of modulus of epoxy and modulus of filler particles on the thermal conductivity of thermal conductive adhesives (TCA), this paper concludes, in contrast to intuition, that the stiffer epoxy will generate a larger contact area, and the "soft" epoxy with modulus of 0.5GPa will create the largest contact area, hence the highest thermal conductivity. Therefore, it is advisable to adopt softer epoxy in TCA. On the other hand, this paper finds that if the shrinkage of epoxy is low, i.e. 1% linear shrinkage, fillers composed of a mixture of Ag flakes and certain high stiffness material will cause a higher thermal conductivity, i.e. 7% larger than that of pure Ag fillers. This suggests that with low shrinkage epoxy, it is advisable to mix Ag flakes with high stiffness particles, e.g. Diamond or SiC. However, when linear shrinkage of epoxy is high, i.e. 3%, the highest thermal conductivity is achieved by using pure Ag fillers. Therefore, in such cases it is not advisable to use Bi-model. © 2010 IEEE.
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| 13. |
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| 14. |
- Wang, Shun, et al.
(author)
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MDS study on the adhesive heat transfer in micro-channel cooler
- 2010
-
In: Proceedings - 2010 11th International Conference on Electronic Packaging Technology and High Density Packaging, ICEPT-HDP 2010; Xi'an; 16 August 2010 through 19 August 2010. - 9781424481422 ; :Article number 5583859, s. 630-633
-
Conference paper (peer-reviewed)abstract
- Carbon nanotube (CNT) can be used in micro-channel cooler construction due to its excellent thermal conductivity. When fabricating CNTs directly onto the chip, the chip could be damaged because of the high temperature required for CNT growth (about 750°C). As a solution, a transfer technique is developed where the desired carbon nanotube pattern can be obtained by taking off a pre-fabricated CNT forest with a designed adhesive, and the transfer process could make the chip or other components immune from the high temperature required for the CNT growth process. This process can also improve the bonding/adhesive strength. Nevertheless, the use of adhesive in the CNT-based micro-channel structure might affect the thermal conduction of the cooling system. In particular, the heat transfer between the heat generator and the CNT fin in the micro-channel cooler shall be evaluated. In this paper the thermal conductivity of the adhesive is studied by molecular dynamics simulation (MDS). The adhesive considered in the present MDS model consists of the epoxy and the curing agent. After the curing process, the epoxy molecules construct a network, which is established in the epoxy matrix generation before the simulation. Nonequilibrium Molecular Dynamics Method (NEMD) is adopted in the modeling and periodic boundary conditions are applied. Furthermore, the heat transfer through CNT and adhesive interface is simulated in this work based on the adhesive results, which can provide information for future macro-analysis of the thermal performance of the CNT microchannel cooler. © 2010 IEEE.
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| 15. |
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| 16. |
- Zhang, Yong, 1982, et al.
(author)
-
Improved Thermal Properties of Three-Dimensional Graphene Network Filled Polymer Composites
- 2022
-
In: Journal of Electronic Materials. - : Springer Science and Business Media LLC. - 1543-186X .- 0361-5235. ; 51:1, s. 420-425
-
Journal article (peer-reviewed)abstract
- This paper presents the improved thermal property of three-dimensional (3D) graphene network modified polydimethylsiloxane (PDMS) composites. It shows that with a 2 wt.% loading of graphene foams (GF), the thermal conductivity of GF/PDMS composite was successfully increased from 0.19 W/mK to 0.42 W/mK, which is 2.2 times higher than that of neat PDMS. However, if GF was transformed into graphene sheets (GS) by sonication, the thermal conductivity of GS/PDMS was decreased to 0.28 W/mK. The remarkable improvement of the thermal properties is attributed to the 3D interconnected graphene network in GF, which form continuous heat transfer networks. Furthermore, the finite element analysis was conducted to evaluate the effect of GFs in composites, where some parameters such as thickness and thermal conductivity were analyzed and discussed. Our results indicate that the continuous 3D GFs holds great potential as fillers to improve the thermal property of polymer materials.
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| 17. |
- Zhang, Y., et al.
(author)
-
Molecular dynamics simulation for the bonding energy of metal-SWNT interface
- 2011
-
In: Proceedings - 12th International Conference on Electronic Packaging Technology and High Density Packaging, ICEPT-HDP 2011, Shanghai, 8-11 August 2011. - 9781457717680 ; , s. 506-509
-
Conference paper (peer-reviewed)abstract
- For this paper, we carried out molecular dynamics simulation to calculate the bonding energy of the metal-SWNT interface. Three kinds of metal, namely iron, nickel and gold, were studied. The results show that the iron-SWNT interface has the strongest bonding energy, and then nickel and gold. To confirm these results, tensile loading tests were also performed to study the breaking force of the metal-SWNT interface. The force needed to debond the metal-SWNT interface is at the order of nano-newton. The more adhesion energy the interface has, the bigger force that must be loaded to break the joint.
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| 18. |
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| 19. |
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