Spent coffee grounds as supporting materials to produce bio-composite PCM with natural waxes

Yoo, Jiwon; Chang, Seong Jin; Wi, Seunghwan; Kim, Sumin

doi:10.1016/j.chemosphere.2019.06.195

Cited by 58 publications

(11 citation statements)

References 32 publications

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“…Several typical porous supporting carriers for the preparation of PCCs have been studied, including metal foam, expanded graphite, carbon nanotube, graphene oxide and graphene aerogel, carbon aerogel, and mesoporous silica . Among the various examined porous substances so far, highly interconnected 3D carbon materials are one of the ideal supporting materials; − in particular, biomass-based carbon materials are favored by many researchers because of their low cost/price, easy availability, and environmental friendliness.…”

Section: Introductionmentioning

confidence: 99%

3D Lamellar Structure of Biomass-Based Porous Carbon Derived from Towel Gourd toward Phase Change Composites with Thermal Management and Protection

Song

Cai

et al. 2020

ACS Appl. Bio Mater.

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The practical application of shape-stable phase change composites (PCCs) is beneficial to thermal energy management and energy conservation due to their superior properties. A shape-stable PCC was fabricated by incorporating poly(ethylene glycol) (PEG) with biomass-based porous carbon that was produced via freeze-drying and carbonization using a low-cost and environmentally friendly fresh towel gourd. The towel gourd derived porous carbon with the characteristics of porosity, unique three-dimensional (3D) lamellar structure, and high specific surface area allowed a high encapsulation capacity (up to 94.5 wt %) for PEG. Structural morphologies, as well as the properties of latent heat storage, thermal reliability, thermal energy management, and thermal protection ability of the fabricated shape-stable PCC, were investigated. The micromorphologies revealed that PEG molecular chains were arranged in a 3D lamellar tissue structure. The shape-stable PCC demonstrated excellent thermal reliability and a high melting latent heat of ∼164.3 J/g. The analysis of infrared thermal images indicated that the shape-stable PCC exhibited remarkable strengths in thermal energy management. The result of the thermal insulation simulation experiment proved that the shape-stable PCC had superior thermal protection ability. This study provided an innovative strategy for the design and development of shape-stable PCCs for great potential in heat-insulating protective textiles, solar thermal energy storage, energy-saving buildings, and infrared stealth of military targets.

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Section: Introductionmentioning

confidence: 99%

3D Lamellar Structure of Biomass-Based Porous Carbon Derived from Towel Gourd toward Phase Change Composites with Thermal Management and Protection

Song

Cai

et al. 2020

ACS Appl. Bio Mater.

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“…Furthermore, the latent heat capacities of melting of both bio‐chars prepared in this work were compared with those of different bio‐based carbons reported in literature (Table 2). 23,29,31‐34,41‐47 As can be seen evidently from the tabulated data, the LHTES properties of the composites are varied depending on the confinement rate and latent heat energy capacity of PCM. Accordingly, both CHW/CA and ACHW/CA composites have higher phase change enthalpies than that of many bio‐based carbon/PCM composites.…”

Section: Resultsmentioning

confidence: 97%

Carbonized waste hazelnut wood‐based shape‐stable composite phase change materials for thermal management implementations

et al. 2021

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Summary Two kinds of new bio‐chars were produced from carbonization of waste hazelnut wood as low‐cost and eco‐friendly supporting matrices to simultaneously solve the seepage and low thermal conductivity problem of capric acid (CA) used as a phase change materials (PCM) for thermal management applications. In the prepared seepage‐free composites, the CA was impregnated by 52 and 64 wt% into porous structure of carbonized hazelnut wood (CHW) and activated carbonized hazelnut wood (ACHW), respectively. The SEM analysis exhibited that the CA was well confined by CHW and ACHW. FTIR and XRD investigations confirmed the existence of good chemical compatibility between CA and CHW/or ACHW. DSC results indicated that the seepage‐free CHW/CA and ACHW/CA composites have melting points of 28.5°C and 28.9°C, and melting enthalpies of 111.3 and 110.3 J/g, respectively. TG analyses revealed that the functioning temperatures of the composites were considerably lower than their thermal degradation temperatures. The LHTES properties and chemical structure of the composites was not altered throughout 1000‐cycling thermal test. The thermal conductivity of CHW/CA and ACHW/CA were 2.70 to 3.05 times higher than that of pure CA. The decrease in melting/solidification time of the composites proved the improvement in their thermal conductivities compared with pure CA. Consequently, the produced bio‐chars can be evaluated as supporter and thermal conductivity enhancer materials (TCEMs) for PCMs; besides, the fabricated composite PCMs can be considered as hopeful admixtures to fabricate of cost‐effective, eco‐friendly and energy‐efficient new types of mortar, concrete and plaster which can be used for thermal management implementations in buildings.

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“…So, two extreme formulations were prepared to study the composites’ properties, namely, a starch ratio of 0.4 (SSCC-40 friability limit) and 1 (SSCC-100 starch only). The starch/water ratio was set at 0.1 to prepare the paste [ 28 ]. Preliminary tests indicated a very brittle constitution of the obtained composites, and glycerol (20% of starch weight) was added to the mix as a starch plasticizer to prevent the sample from being too brittle [ 29 ].…”

Section: Methodsmentioning

confidence: 99%

Spent Coffee Grounds as Building Material for Non-Load-Bearing Structures

et al. 2022

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The gradual development of government policies for ecological transition in the modern construction sector leads researchers to explore new alternative and low environmental impact materials with a particular focus on bio-sourced materials. In this perspective, the mechanical, thermal insulation, and the sound absorption performances of a spent coffee grounds/potato starch bio-based composite were analyzed for potential application in buildings. Based on thermal conductivity and diffusivity tests, the coffee grounds waste biocomposite was characterized as an insulating material comparable with conventional thermal insulation materials of plant origin. Acoustical tests revealed absorption coefficients in the same range as other conventional materials used in building acoustical comfort. This bio-sourced material presented a sufficient compressive mechanical behavior for non-load-bearing structures and a sufficient mechanical capacity to be shaped into building bricks. Mechanical, thermal, and acoustic performances depend on the moisture environment. The groundwork was laid for an initial reflection on how this composite would behave in two opposite climates: the continental climate of Reims in France and the tropical climate of Belém in Brazil.

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Spent coffee grounds as supporting materials to produce bio-composite PCM with natural waxes

Cited by 58 publications

References 32 publications

3D Lamellar Structure of Biomass-Based Porous Carbon Derived from Towel Gourd toward Phase Change Composites with Thermal Management and Protection

3D Lamellar Structure of Biomass-Based Porous Carbon Derived from Towel Gourd toward Phase Change Composites with Thermal Management and Protection

Carbonized waste hazelnut wood‐based shape‐stable composite phase change materials for thermal management implementations

Spent Coffee Grounds as Building Material for Non-Load-Bearing Structures

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