Microstructure Effects on Effective Gas Diffusion Coefficient of Nanoporous Materials

Guo, Yangyu; He, Xinting; Huang, W.D.; Wang, Moran

doi:10.1007/s11242-018-1165-4

Cited by 43 publications

(20 citation statements)

References 60 publications

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“…The porosity was approximately 34.6%, and pores of approximately 10 to 100 µm in size were measured. In order for convection to occur within the open pores, the pore diameter should be 10 times the air's mean free path (MFP) 44 , 45 . In other words, the MFP of the air is approximately 64 nm, and heat exchange is thus possible if the pore diameter is greater than 640 nm.…”

Section: Resultsmentioning

confidence: 99%

Fanless, porous graphene-copper composite heat sink for micro devices

Rho

Jang

Bae

et al. 2021

Sci Rep

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Thermal management in devices directly affects their performance, but it is difficult to apply conventional cooling methods such as the use of cooling liquids or fans to micro devices owing to the small size of micro devices. In this study, we attempted to solve this problem by employing a heat sink fabricated using copper with porous structures consisting of single-layer graphene on the surface and graphene oxide inside the pores. The porous copper/single-layer graphene/graphene oxide composite (p-Cu/G/rGO) had a porosity of approximately 35%, and the measured pore size was approximately 10 to 100 µm. The internal GO was reduced at a temperature of 1000 °C. On observing the heat distribution in the structure using a thermal imaging camera, we could observe that the p-Cu/G/rGO was conducting heat faster than the p-Cu, which was consistent with the simulation. Furthermore, the thermal resistance of p-Cu/G/rGO was lower than those of the p-Cu and pure Cu. When the p-Cu/G/rGO was fabricated into a heat sink to mount the light emitting diode (LED) chip, the measured temperature of the LED was 31.04 °C, which was less than the temperature of the pure Cu of 40.8 °C. After a week of being subjected to high power (1000 mA), the light intensity of p-Cu/G/rGO decreased to 95.24%. However, the pure Cu decreased significantly to 66.04%. The results of this study are expected to be applied to micro devices for their effective thermal management.

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Section: Resultsmentioning

confidence: 99%

Fanless, porous graphene-copper composite heat sink for micro devices

Rho

Jang

Bae

et al. 2021

Sci Rep

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“…Based on our previous experience on multiphase displacement in rocks, we believe that the pore size plays a key role on the oil development in tight reservoirs with micro/nano pores. The maximal ball algorithm was used to calculate the local pore size in the porous microstructures in this work.…”

Section: Experimental Methodsmentioning

confidence: 99%

Enhanced oil recovery mechanism and recovery performance of micro‐gel particle suspensions by microfluidic experiments

Lei

Liu

Xie

et al. 2019

Energy Science & Engineering

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Micro‐gel particle suspensions (MGPS) have been proposed for enhanced oil recovery (EOR) in reservoirs with harsh conditions in recent years, yet the mechanisms are still not clear because of the complex property of MGPS and the complex geometry of rocks. In this paper, the micro‐gel particle‐based flooding has been studied by our microfluidic experiments on both bi‐permeability micromodels and reservoir‐on‐a‐chip. A method for reservoir‐on‐a‐chip design has been proposed based on QSGS (quartet structure generation set) to ensure that the flow geometry on chip owns the most important statistical features of real rock microstructures. In the micromodel experiments with heterogeneous microstructures, even if the MGPS has the same macroscopic rheology as the hydrolyzed polyacrylamides (HPAM) solution for flooding, MGPS may lead to significant fluctuations of pressure field caused by the nonuniform concentration distribution of particles. In the reservoir‐on‐a‐chip experiments, clustered oil trapped in the swept pores can be recovered by MGPS because of pressure fluctuation, which hardly happens in the HPAM flooding. Compared with the water flooding, the HPAM solution flooding leads to approximately 17% incremental oil recovery, while the MGPS results in approximately 49.8% incremental oil recovery in the laboratory.

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“…In order for convection to occur within the open pores, the pore diameter should be 10 times the air's mean free path (MFP). [43][44] In other words, the MFP of the air is approximately 64 nm, and heat exchange is thus possible if the pore diameter is greater than 640 nm. A simulation was performed to confirm the heat dissipation ability of p-CuGrGO, and is shown in Figure 3a.…”

Section: Mainmentioning

confidence: 99%

Fanless, Porous graphene-copper composite heat sink for micro devices

Rho

Jang

Bae

et al. 2021

Preprint

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Thermal management in devices directly affects their performance, but it is difficult to apply conventional cooling methods such as the use of cooling liquids or fans to micro devices owing to the small size of micro devices. In this study, we attempted to solve this problem by employing a heat sink fabricated using copper with porous structures consisting of single-layer graphene on the surface and graphene oxide inside the pores. The porous copper/single-layer graphene/graphene oxide composite (p-CuGrGO) had a porosity of approximately 35%, and the measured pore size was approximately 10 to 100 µm. The internal GO was reduced at a temperature of 1000 ℃. On observing the heat distribution in the structure using a thermal imaging camera, we could observe that the p-CuGrGO was conducting heat faster than the p-Cu, which was consistent with the simulation. Furthermore, the thermal resistance of p-CuGrGO was lower than those of the p-Cu and pure Cu. When the p-CuGrGO was fabricated into a heat sink to mount the light emitting diode (LED) chip, the measured temperature of the LED was 31.04 ℃, which was less than the temperature of the pure Cu of 40.8 ℃. After a week of being subjected to harsh conditions, p-CuGrGO observed 95.24% light intensity, but the light intensity of pure Cu decreased to 66.04%. The results of this study are expected to be applied to micro devices for their effective thermal management.

show abstract

Microstructure Effects on Effective Gas Diffusion Coefficient of Nanoporous Materials

Cited by 43 publications

References 60 publications

Fanless, porous graphene-copper composite heat sink for micro devices

Fanless, porous graphene-copper composite heat sink for micro devices

Enhanced oil recovery mechanism and recovery performance of micro‐gel particle suspensions by microfluidic experiments

Fanless, Porous graphene-copper composite heat sink for micro devices

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