Enhanced thermal conductivity of geopolymer nanocomposites by incorporating interface engineered carbon nanotubes

Zhu, Yong; Qian, Yi-Fan; Wang, Xue; Li, Jiaqiang; Bi, Sheng; Kong, Lijuan; Liu, Wanshuang; Zhang, Ling

doi:10.1016/j.coco.2021.100691

Cited by 28 publications

(26 citation statements)

References 21 publications

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“…Cho 41 noted a percolation threshold of about 3-wt% GNPs by electrical conductivity but no large change in thermal conductivity. Zhu et al, 42 working with similar phase fractions but using CNTs, also did not see a large change in thermal conductivity. An approach that could merit further investigation is a combination of nanoscale particles and microscale particles or longer fibers, as described by Chen et al, 46 Burger et al, 47 and Baruch et al 78 to try to produce long, conductive segments through the matrix with relatively small insulating barriers between them.…”

Section: Resultsmentioning

confidence: 91%

“…[23][24][25] Most work reported on metakaolin GP composite thermal conductivity has involved adding materials or structural features, including glass microspheres, 26 polystyrene (PS), 27,28 cork, 29 mineral particles, 30 rubber disks, 31 and induced porosity, [32][33][34][35][36][37][38] to improve their insulating ability. On the other hand, only few fillers have been evaluated in metakaolin GP composites for increased thermal conductivity (quartz, 39 SiC, 40 graphene nanoplatelets [GNPs], 41 carbon nanotubes [CNTs], 42 diamond, 43 and calcite 44 ). Waste materials to increase the thermal conductivity of GP composites have also not yet been tested.…”

Section: Introductionmentioning

confidence: 99%

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Thermal conductivity of several geopolymer composites and discussion of their formulation

Samuel

Inumerable

Stumpf

et al. 2022

Int J Applied Ceramic Tech

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We fabricated 50.8-mm cube-shaped samples of metakaolin geopolymer (GP) composites with various additives chosen to increase or decrease the thermal conductivity of the composite. Sodium-based GP (NaGP) and GP composites were more conductive than potassium-based GP (KGP) composites for a given phase fraction of filler, but the maximum amount of filler phase was higher with KGP due to the lower viscosity of the KGP mixture. The highest thermal conductivity achieved was about 8 W/m K by KGP + 44-vol% graphite flakes, whereas NaGP + 27 vol% graphite flakes reached 4.7 W/m K. The thermal conductivity was strongly affected by the moisture remaining in the composite, which appeared to have a greater effect at higher filler content. On the other hand, the size of alumina particles (6, 40, or 120 µm) did not have any apparent effect on thermal conductivity for the same filler content. Larger particles caused less change in mixture viscosity, though, thus permitting incorporation of higher filler phase fractions and therefore higher thermal conductivity.

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Section: Resultsmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Thermal conductivity of several geopolymer composites and discussion of their formulation

Samuel

Inumerable

Stumpf

et al. 2022

Int J Applied Ceramic Tech

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“…Thermal parameters of the studied samples are introduced in Table 5 . These are the results of the mutual combination of several effects: (i) porosity and, thus, bulk density, (ii) low thermal conductivity and specific heat of diatomite frustules [ 16 , 17 ] and (iii) high thermal conductivity and specific heat of CNTs [ 18 , 19 ]. In MOC-REF-CNT0.2, the effect of CNTs addition prevailed, whereas the use of CNTs increased both the thermal conductivity and specific heat.…”

Section: Resultsmentioning

confidence: 99%

MOC-Diatomite Composites Filled with Multi-Walled Carbon Nanotubes

et al. 2021

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The studies focusing on magnesium oxychloride cement (MOC) composites have recently become fairly widespread because of MOC’s excellent mechanical properties and environmental sustainability. Numerous fillers, admixtures and nano-dopants were studied in order to improve the overall performance of MOC-based derivatives. Some of them exhibited specific flaws, such as a tendency to aggregate, increase in porosity, aeration of the composite matrix, depreciation in water resistance and mechanical strength, etc. In this manuscript, MOC-based composites doped by multi-walled carbon nanotubes (MWCNTs) are designed and tested. In order to modify the final properties of composites, diatomite was admixed as partial substitution of MgO, which was used in the composition of the researched material in excess, i.e., the majority of MgO constituted part of MOC and the rest served as fine filler. The composites were subjected to the broad experimental campaign that covered SEM (scanning electron microscopy), EDS (energy dispersive spectroscopy), HR-TEM (high-resolution transmission electron microscopy), XRD (X-ray diffraction), OM (optical microscopy) and STA-MS (simultaneous thermal analysis with mass spectroscopy). For 28 days hardened samples, macrostructural and microstructural parameters, mechanical properties, hygric and thermal characteristics were experimentally assessed. The incorporation of MWCNTs and diatomite resulted in the significant enhancement of composites’ compactness, mechanical strength and stiffness and reduction in water absorption and rate of water imbibition. The thermal properties of the enriched MOC composites yielded interesting values and provided information for future modification of thermal performance of MOC composites with respect to their specific use in practice, e.g., in passive moderation of indoor climate. The combination of MWCNTs and diatomite represents a valuable modification of the MOC matrix and can be further exploited in the design and development of advanced building materials and components.

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“…Due to the low thermal conductivity of polymer packaging materials, the thermal conductivity of the polymer is usually improved by adding high thermal conductivity fillers. The filler-filled thermal conductive polymer materials are mainly prepared by adding high thermally conductive metal materials (such as copper powder, , silver powder, − metal sheet, and wire − ), carbon materials (such as carbon fiber, − graphene, − graphite, − carbon nanotube, − and carbon black − ) or high thermal conductive inorganic fillers (such as aluminum nitride, , boron nitride, − silicon nitride, , silicon carbide, − magnesium oxide, , silicon oxide, alumina, − barium titanate, and zinc oxide) and other high thermal conductivity fillers (such as MXene − ). Filler-filled thermal conductive polymer composites have the advantages of a simple preparation method, low cost, suitable types of polymers, and fillers.…”

Section: Introductionmentioning

confidence: 99%

Epoxy Composites with High Thermal Conductivity by Constructing Three-Dimensional Carbon Fiber/Carbon/Nickel Networks Using an Electroplating Method

et al. 2021

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Heat dissipation problem is the primary factor restricting the service life of an electronic component. The thermal conductivity of materials has become a bottleneck that hinders the development of the electronic information industry (such as light-emitting diodes, 5G mobile phones). Therefore, the research on improving the thermal conductivity of materials has a very important theoretical value and a practical application value. Whether the thermally conductive filler in polymer composites can form a highly thermal conductive pathway is a key issue at this stage. The carbon fiber/carbon felt (CF/C felt) prepared in the study has a three-dimensional continuous network structure. The nickel-coated carbon fiber/carbon felt (CF/C/Ni felt) was fabricated by an electroplating deposition method. Three-dimensional CF/C/Ni/epoxy composites were manufactured by vacuum-assisted liquid-phase impregnation. By forming connection points between the adjacent carbon fibers, the thermal conduction path inside the felt can be improved so as to improve the thermal conductivity of the CF/C/Ni/epoxy composite. The thermal conductivity of the CF/C/Ni/epoxy composite (in-plane K∥) is up to 2.13 W/(m K) with 14.0 wt % CF/C and 3.70 wt % Ni particles (60 min electroplating deposition). This paper provides a theoretical basis for the development of high thermal conductivity and high-performance composite materials urgently needed in industrial production and high-tech fields.

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Enhanced thermal conductivity of geopolymer nanocomposites by incorporating interface engineered carbon nanotubes

Cited by 28 publications

References 21 publications

Thermal conductivity of several geopolymer composites and discussion of their formulation

Thermal conductivity of several geopolymer composites and discussion of their formulation

MOC-Diatomite Composites Filled with Multi-Walled Carbon Nanotubes

Epoxy Composites with High Thermal Conductivity by Constructing Three-Dimensional Carbon Fiber/Carbon/Nickel Networks Using an Electroplating Method

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