Thermal and morphological studies on novel PCM microcapsules containing n-hexadecane as the core in a flexible shell

Lashgari, Somayeh; Arabi, Hassan; Mahdavian, Ali Reza; Ambrogi, Veronica

doi:10.1016/j.apenergy.2016.12.158

Cited by 104 publications

(33 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It should be noted that the PCM solidification processes in cold storage are different from those in heat storage in terms of internal pressure and deformation mechanism of shells [20,25,26]. Because of the volume shrinkage of PCM during solidification in cold storage application, the internal pressure of microcapsule decreases while the external pressure is constant [27,28].…”

Section: Introductionmentioning

confidence: 99%

Thermo-mechanical analysis of microcapsules containing phase change materials for cold storage

Tchuenbou-Magaia

Al‐Duri

et al. 2018

Applied Energy

View full text Add to dashboard Cite

Microencapsulated phase change material slurries (MEPCMSs) offer a potentially efficient and flexible solution for cryogenic-temperature cold storage. In this paper, the phase change material (PCM) microcapsules prepared to form MEPCMSs for cryogenictemperature cold storage consist of Dowtherm J (DJ) as core material and melamine formaldehyde (MF) as primary shell material. DJ is an aromatic mixture with diethylbenzene as the main component. Composite shell materials are adopted to avoid cracking by adding aluminium oxide (Al 2 O 3) nanoparticles or copper (Cu) coating into/on MF shell. In order to explore the heat transfer behaviour and mechanical stability of the microcapsules during the solidification process of PCM, a thermo-mechanical model is established by taking into account of energy conservation, pressure-dependent solid-liquid equilibria, Lamé's equations and buckling theory. Based on the proposed model, the effects of shell thickness, shell compositions and microcapsule size are therefore studied on the variations of pressure difference, freezing point, and latent heat. The cause of shell deformation is clearly explained and the shell buckling modes are predicted using the model, which agree well with the experimental observations. The critical core/shell size ratios of avoiding buckling are proposed for the microcapsules with different compositions. Simultaneously incorporation of Al 2 O 3 nanoparticles and Cu coating into/on MF shell can markedly enhance the resistant to buckling. In addition, special attention is paid to cold energy storage capacity of MEPCMSs, which has considerable superiority compared to packed pebble beds.

show abstract

Section: Introductionmentioning

confidence: 99%

Thermo-mechanical analysis of microcapsules containing phase change materials for cold storage

Tchuenbou-Magaia

Al‐Duri

et al. 2018

Applied Energy

View full text Add to dashboard Cite

show abstract

“…They also concluded that the fabricated PCMs were suitable for passive thermal energy storage applications. Lashgari et al . developed PCM microcapsules containing n ‐hexadecane (HD or C 16 ) with different shell materials.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of paraffin microcapsules for energy‐saving applications

Mert

Gumus

2019

J of Applied Polymer Sci

View full text Add to dashboard Cite

A series of microencapsulated phase‐change materials (PCMs) with styrene–divinyl benzene shells composed of an n‐octadecane (OD or C18)–n‐hexadecane (HD or C16) mixture as the core were synthesized by an emulsion polymerization method. The effects of the core/shell ratio (C/S) and surfactant concentration (Csurf) on the thermal properties and encapsulation ratios of the PCMs were investigated. The chemical structures and morphological properties of the microcapsules were characterized by Fourier transform infrared (FTIR) spectroscopy and scanning electron microscopy analysis, respectively. The characteristic peaks of the paraffin mixtures and shell material located in the FTIR spectrum of the microencapsulated PCMs proved that the encapsulation of the PCM mixture was performed successfully. The thermal properties of the paraffin microcapsules were determined by differential scanning calorimetry (DSC) and thermogravimetric analysis. DSC analysis demonstrated that the microcapsules containing the maximum amount of paraffin mixture (C/S = 2:1) and the minimum Csurf (45 mmol/L) had the highest latent heat value of 88 kJ/kg and a latent heat of temperature of 21.06°C. Moreover, the maximum encapsulation ratio of the paraffin mixture was found to be 56.77%. With respect to the analysis results, the encapsulated binary mixture, which consisted of OD–HD with a poly(styrene‐co‐divinyl benzene) shell, is a promising material for thermal energy storage applications operating at low temperatures, such as in the thermal control of indoor temperatures and air‐conditioning applications in buildings for desirable thermal comfort and energy conservation. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47874.

show abstract

“…PCMs, which absorb energy upon melting and release heat upon solidifying, have been used in various energy storage applications, such as energy‐saving buildings, solar energy utilization, and temperature‐regulating clothing. PCMs include salt hydrates, fatty acids, esters, and paraffins . Among them, paraffins have attracted more attention for their versatile phase‐change temperatures, high enthalpy, low degree of supercooling, good thermal stability, and relatively low cost.…”

Section: Introductionmentioning

confidence: 99%

“…Microencapsulation of phase change materials (MEPCMs) is a process of coating PCM droplets with a shell to form microcapsules with diameters of nano‐ to micrometers. So far, many materials have been developed as shell materials to prepare microencapsulated PCMs, including inorganic materials, such as SiO 2 , TiO 2 , and CaCO 3 ; polymers, such as polyurethane, polystyrene, melamine resin, and acrylic; and biomacromolecules, such as silk fibroin, ethyl cellulose, and arabic gum . Melamine resin and acrylic polymers have been the most‐studied shell materials.…”

Section: Introductionmentioning

confidence: 99%

Efficient preparation and characterization of paraffin‐based microcapsules by emulsion polymerization

Yang

2019

J of Applied Polymer Sci

View full text Add to dashboard Cite

Microencapsulated phase-change materials (MEPCMs) with paraffin as the core and poly(methyl methacrylate) (PMMA) and PMMA copolymers as the shell were prepared by emulsion polymerization using redox initiators at low temperatures. Fourier transform infrared spectroscopy was used to characterize the chemical composition of MEPCMs. The thermal properties and thermal stabilities of MEPCMs were tested by differential scanning calorimetry and thermogravimetric analysis. The morphologies and sizes of the microcapsules were investigated by scanning electron microscopy and particle size distribution analysis. The results indicated that the yield of microcapsules is as high as 96.2%, and the encapsulation efficiency of paraffin is nearly 100% when the paraffin content in MEPCM is 70%. The MEPCMs have good stability: the leakage ratios of MEPCMs can be less than 1% after 50 heating-cooling cycles. Therefore, the microencapsulation of paraffin using redox initiators has good production and application prospects.

show abstract

Thermal and morphological studies on novel PCM microcapsules containing n-hexadecane as the core in a flexible shell

Cited by 104 publications

References 34 publications

Thermo-mechanical analysis of microcapsules containing phase change materials for cold storage

Thermo-mechanical analysis of microcapsules containing phase change materials for cold storage

Preparation and characterization of paraffin microcapsules for energy‐saving applications

Efficient preparation and characterization of paraffin‐based microcapsules by emulsion polymerization

Contact Info

Product

Resources

About