Preparation of n-tetradecane-containing microcapsules with different shell materials by phase separation method

Yang, Rui; Zhang, Yan; Wang, Xin; Zhang, Yinping; Zhang, Qingwu

doi:10.1016/j.solmat.2009.06.019

Cited by 79 publications

(23 citation statements)

References 22 publications

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“…Loxley and Vincent [83] successfully encapsulated n-Hexadecane with polymethylmethacrylate (PMMA) by using this method. Yang et al [84] also used the same method to produce microencapsulated n-tetradecane with different shell materials (Acrylonitrile-styrene copolymer (AS), acrylonitrile-styrene-butadiene copolymer (ABS) and polycarbonate (PC)). They achieved particle sizes of less than 1μm with melting enthalpy of more than 100 kJ/kg and encapsulation efficiency of 66-75% for all the three shell materials.…”

Section: Other Micro-/nano-encapsulation Methodsmentioning

confidence: 99%

Review of solid–liquid phase change materials and their encapsulation technologies

Darkwa

Kokogiannakis

2015

Renewable and Sustainable Energy Reviews

777

267

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Various types of solid-liquid phase change materials (PCMs) have been reviewed for thermal energy storage applications. The review has shown that organic solid-liquid PCMs have much more advantages and capabilities than inorganic PCMs but do possess low thermal conductivity and density as well as being flammable. Inorganic PCMs possess higher heat storage capacities and conductivities, cheaper and readily available as well as being non-flammable, but do experience supercooling and phase segregation problems during phase change process. The review has also shown that eutectic PCMs have unique advantage since their melting points can be adjusted. In addition, they have relatively high thermal conductivity and density but they possess low latent and specific heat capacities. Encapsulation technologies and shell materials have also been examined and limitations established. The morphology of particles was identified as a key influencing factor on the thermal and chemical stability and the mechanical strength of encapsulated PCMs. In general, in-situ polymerization method appears to offer the best technological approach in terms of encapsulation efficiency and structural integrity of core material. There is however the need for the development of enhancement methods and standardization of testing procedures for microencapsulated PCMs. Abstract: Various types of solid-liquid phase change materials (PCMs) have been reviewed for thermal energy storage applications. The review has shown that organic solid-liquid PCMs have much more advantages and capabilities than inorganic PCMs but do possess low thermal conductivity and density as well as being flammable. Inorganic PCMs possess higher heat storage capacities and conductivities, cheaper and readily available as well as being non-flammable, but do experience supercooling and phase segregation problems during phase change process. The review has also shown that eutectic PCMs have unique advantage since their melting points can be adjusted. In addition they have relatively high thermal conductivity and density but they possess low latent and specific heat capacities. Encapsulation technologies and shell materials have also been examined and limitations established. The morphology of particles were identified as a key influencing factor on the thermal and chemical stability and the mechanical strength of encapsulated PCMs. In general, in-situ polymerization method appears to offer the best technological approach in terms of encapsulation efficiency and structural integrity of core material. There is however the need for the development of enhancement methods and standardization of testing procedures for microencapsulated PCMs.

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Section: Other Micro-/nano-encapsulation Methodsmentioning

confidence: 99%

Review of solid–liquid phase change materials and their encapsulation technologies

Darkwa

Kokogiannakis

2015

Renewable and Sustainable Energy Reviews

777

267

View full text Add to dashboard Cite

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“…The molecular weight of the shell material also influenced the microencapsulation -a lower molecular weight gave greater encapsulation efficiency because of the higher mobility of the shell molecules, but it reduced the shell's strength [34]. Recently, Jin et al [59] have produced microcapsules of PCM using silica as the shell in a one-step procedure without surfactants or dispersants. This allowed fabrication of capsules with controlled size and dispersity incorporating various core materials.…”

Section: Other Methodsmentioning

confidence: 99%

Different Phase Change Material Implementations for Thermal Energy Storage

Karkri

Lefèbvre

Royon

2015

The Handbook of Environmental Chemistry

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This paper presents the principal methods available for phase change material (PCM) implementation in different storage applications. The first part is devoted to a non-exhaustive overview of the various chemical processes used to develop stable PCM (such as microencapsulation, emulsion polymerization or suspension polycondensation, polyaddition, etc.) based on the available literature. The second part deals with shape-stabilized PCM, developed from an intimate combination of a polymer matrix and a phase change element. Materials able to include more thermal energy as usual ones are interesting as they increase the thermal inertia of the system that presents by this way advantages. The energy efficiency of buildings may be improved including PCMs that store and provide enthalpy from one hand and without any significant temperature modification during the phase change process on the other hand. If the solid phase of the PCM does not present any problem, it is not the same for the liquid phase which must be maintained mechanically at its assigned location. Furthermore, the PCM in the solid (and furthermore in the liquid phase) does not have mechanical properties which allow to use it as a structural material able to support charge loads. This paper presents different methods to distribute and maintain the PCM in the thermal solid matrix.

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“…They have large latent heat capacity, negligible supercooling, low vapour pressure, good thermal and chemical stability, selfnucleating behaviour, high latent heat of fusion and wide range of solid-liquid phase change temperatures for many latent heat energy storage applications [5,6]. However, they have some drawbacks such as low thermal conductivity, flammability and high volume change during phase change [7,8].…”

Section: Introductionmentioning

confidence: 99%

Consolidated microcapsules with double alginate shell containing paraffin for latent heat storage

Németh

Tóth

et al. 2015

Solar Energy Materials and Solar Cells

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Double-shell alginate microcapsules containing paraffin phase change material (PCM) were prepared for latent heat storage by a method of repeated interfacial coacervation/crosslinking.The proposed process consisted of three main steps: (1) preparation of paraffin containing core particles by dripping an O/W emulsion of melted paraffin and aqueous sodium alginate into a calcium chloride ionic cross-linking solution, (2) encapsulation of the core particles into double alginate shell by ionic gelation/crosslinking by repeated interactions between the sodium alginate and calcium chloride solutions, and (3) consolidation of the capsule shells by contact heat treatment. The effects of process parameters such as the sodium alginate concentration, the calcium chloride concentration in certain stages of the process, and the contact time between the formed core particles and the surrounding alginate solution on the paraffin content and the mean diameter of capsules were studied by experimental design and statistical evaluations. The prepared PCM capsules had uniform sizes, core/shell structure, double-walled non-porous alginate coating, tunable void space inside the core, and suitably high paraffin content at properly selected process conditions, corresponding to 95.0 J/g melting and 91.7 J/g freezing latent heat capacity. Thermogravimetric analysis and repeated thermal cycling evidenced good thermal stability, and proper mechanical strength for leakage free microcapsules.

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Preparation of n-tetradecane-containing microcapsules with different shell materials by phase separation method

Cited by 79 publications

References 22 publications

Review of solid–liquid phase change materials and their encapsulation technologies

Review of solid–liquid phase change materials and their encapsulation technologies

Different Phase Change Material Implementations for Thermal Energy Storage

Consolidated microcapsules with double alginate shell containing paraffin for latent heat storage

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