Cumulative pore volume, pore size distribution and phases percolation in porous inorganic polymer composites: Relation microstructure and effective thermal conductivity

Kamseu, Elie; Ngouloure, Zénabou N. M.; Naït-Ali, Benoît; Zékeng, S.; Melo, Uphie Chinje; Rossignol, Sylvie; Leonelli, Cristina

doi:10.1016/j.enbuild.2014.11.066

Cited by 75 publications

(45 citation statements)

References 22 publications

(60 reference statements)

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“…As previously discussed, in the material investigated here The thermal conductivity of the material, calculated as the average on three samples, was of 0.073 W/mK at 30 • C for an average bulk density of 313 kg/m 3 , a value in line with previous studies on alkali activated foams [18,32,33,38] and lower than other lightweight inorganic materials for thermal insulation such as aerated concrete [39,40]. As evidenced from many literature studies, the thermal conductivity of a porous material mainly relates with its density, a parameter which in turn is determined by different factors such as the solid/liquid ratio, the curing temperature, the addition of surfactants/foaming agents and the raw materials used [9,17,21,32,33]. The latter, however, seem to play a less significant role, as the results here obtained can be directly compared with those obtained different geopolymers, regardless the nature of the precursors.…”

Section: Thermal Propertiessupporting

confidence: 66%

“…Insulating and flame-resistant materials have been recently developed as greener alternatives to the more traditional petrochemical-derived solutions [6]: an increasing use of renewable resources and new manufacturing processes integrating wastes are being largely adopted in the production of insulating products [1,4,[7][8][9]. Nevertheless, fully meeting the technical and safety requirements and at the same time reducing the environmental impact of the manufacturing process still represents an issue to address.…”

Section: Introductionmentioning

confidence: 99%

“…As well as being excellent candidates for the development of thermal insulating and flame-resistant products, geopolymers have the advantage that they can be obtained from a wide range of by-products and waste materials, including coal combustion ashes, biomass ashes, metallurgical slags, construction and demolition wastes and the like, having therefore a negligible impact on the environment [7,9,22]. Among them, ashes derived from the combustion of vegetal and animal residues still represent an understudied source material for the production of alkali activated materials, given their peculiar chemical nature largely based on calcium phosphates, alkali sulphates and chlorides and only secondarily on reactive aluminosilicates [23,24].…”

Section: Introductionmentioning

confidence: 99%

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Porous Geopolymer Insulating Core from a Metakaolin/Biomass Ash Composite

et al. 2017

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Ashes derived from the combustion of vegetal and animal biomass still represent a mostly unexplored secondary raw material for the production of alkali-activated materials, given their peculiar chemical nature. In this work, calcium phosphate biomass ashes were successfully used as partially reactive fillers in a metakaolin-based geopolymer composite to produce, by direct foaming, sustainable and lightweight boards with thermal insulating properties. The investigated materials were obtained by activating a blend of metakaolin and biomass ash in a weight ratio of 1: 1 and foamed with the addition of H 2 O 2 in measure of 5 wt. %, to maximize the volume of disposed ash and ensure adequate properties to the material at the same time. The obtained geopolymer composite was characterized by microstructural, chemical-physical, mechanical and thermal analysis: the obtained results showed that biomass ash and metakaolin well integrated in the microstructure of the final porous material, which was characterized by a density of about 310 kg/m 3 and a thermal conductivity of 0.073 W/mK at a mean test temperature of 30 • C, coupled with an acceptable compressive strength of about 0.6 MPa. Dilatometric and thermogravimetric analysis, performed up to 1000 • C, highlighted the thermal stability of the composite, which could be regarded as a promising material for low-cost, self-bearing thermal insulating partitions or lightweight cores for thermostructural sandwich panels.

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Section: Thermal Propertiessupporting

confidence: 66%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Porous Geopolymer Insulating Core from a Metakaolin/Biomass Ash Composite

et al. 2017

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“…Hence, the enhancement of heat dissipation abilities of materials used in these sensitive devices has become very crucial (Lee et al 2012a,b). The inclusion of thermal interface materials (TIMs) placed between heat sources and heat sinks is necessary for efficient thermal management (Hou et al 2015, Kamseu et al 2015. Figure 1 illustrates the preparation of thermally conductive polymer nanocomposites (PNCs) fabricated through inclusion of thermally conductive nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Recently emerging trends in thermal conductivity of polymer nanocomposites

Idumah

Hassan²

2016

Reviews in Chemical Engineering

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Due to escalating power densities in electronics, information, communication, energy storage, aerospace, and automobile technologies, heat dissipation has become immensely essential for the efficient performance and reliability of photonic, electronics, optoelectronics, and other devices in order to proactively prevent premature failure due to overheating. The functionalization and synergistic inclusion of thermally conducting nanoparticles such as carbon derivatives and metallic and ceramic fillers into polymer matrices have resulted in development of thermally conducting polymer nanocomposites. This has enlarged the scope of application of these materials in areas hitherto restricted due to poor thermal conductivity and, therefore, opened broad windows of opportunities for polymer nanocomposites as emerging alternative replacements for metal components in various applications where effective heat dissipation is compulsory for device performance. Thus, this paper critically discusses globally emerging technologies applied in the development of thermally conductive polymer nanocomposites for various industrial applications.

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“…e main challenge on inorganic insulation materials' development is related to the production of a high porous material with sufficient mechanical properties. Geopolymer foams can be produced by the introduction of foaming agents such as hydrogen peroxide [18][19][20][21], metal powders [22][23][24], or silica fumes [25][26][27]. eir foaming action is due to the oxygen or hydrogen formation in alkaline conditions according to the following reactions:…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Porous Fly Ash‐Based Geopolymers Using Si as Foaming Agent

Kioupis

Kavakakis

Tsivilis

et al. 2018

Advances in Materials Science and Engineering

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is paper concerns the synthesis of foamed geopolymers using fly ash and metallic Si as the binder and the porogent agent, respectively. e Taguchi approach was applied in order to study the effect of some significant synthesis parameters such as the Si foaming agent content (% w/w fly ash based), the alkali type (R : Na or K), and the alkalinity (R/Al molar ratio) of the activation solution on the compressive strength and apparent density of the foamed geopolymers. e final products were characterized by means of XRD, FTIR, and SEM, while optical microscopy was applied for the evaluation of the porosity. Lightweight geopolymers with a compressive strength of 2.08-14.88 ΜPa and an apparent density of 0.84-1.55 g/cm 3 were prepared by introducing a Si content up to 0.2% w/w on fly ash basis.

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Cumulative pore volume, pore size distribution and phases percolation in porous inorganic polymer composites: Relation microstructure and effective thermal conductivity

Cited by 75 publications

References 22 publications

Porous Geopolymer Insulating Core from a Metakaolin/Biomass Ash Composite

Porous Geopolymer Insulating Core from a Metakaolin/Biomass Ash Composite

Recently emerging trends in thermal conductivity of polymer nanocomposites

Synthesis and Characterization of Porous Fly Ash‐Based Geopolymers Using Si as Foaming Agent

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