Synthesis and properties of microencapsulated n-octadecane with polyurea shells containing different soft segments for heat energy storage and thermal regulation

Zhang, Huanzhi; Wang, Xiaodong

doi:10.1016/j.solmat.2009.02.021

Cited by 251 publications

(108 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Fig. 6 shows a process used by Zhang et al [34] to synthesize microencapsulated n-octadecane with polyurea shells which were produced with tolylene 2,4-diisocyanate (TDI) and three different amines namely, ethylene diamine (EDA), diethylene triamine (DETA) and Jeffamine T403. The oil solution was prepared by mixing together TDI and n-octadecane and then adding water to the mixture at a stirring speed of 3000 rpm to produce O/W emulsion.…”

Section: Interfacial Polycondensationmentioning

confidence: 99%

“…Moreover, it's helpful for evaluation of micro/nano-encapsulation process, i.e. : Zhang et al [34] suggested using encapsulation efficiency which was defined as the ratio of the actual core content of the microcapsules to the theoretical core content.…”

Section: Thermal Energy Storage Capacity and Phase Change Temperaturementioning

confidence: 99%

“…Zhang et al [34] used this method for evaluating the durability of samples of MEPCMs. The releasing rate (weight percentage of the released substance) of 10 g of microencapsulated n-octadecane was measured by dispersing it in a 50ml acetone (as an extraction solvent) and at a stirring speed of 200 rpm.…”

Section: Chemical Stabilitymentioning

confidence: 99%

See 2 more Smart Citations

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

Darkwa

Kokogiannakis

2015

Renewable and Sustainable Energy Reviews

781

267

View full text Add to dashboard Cite

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.

show abstract

Section: Interfacial Polycondensationmentioning

confidence: 99%

Section: Thermal Energy Storage Capacity and Phase Change Temperaturementioning

confidence: 99%

See 1 more Smart Citation

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

Darkwa

Kokogiannakis

2015

Renewable and Sustainable Energy Reviews

781

267

View full text Add to dashboard Cite

show abstract

“…2. The DSC results were also used to determine the encapsulation efficiency which is defined as the ratio of the actual core content of the microcapsules to the theoretical core content [24]. The percentages of core material contents for the samples were therefore obtained as 29% for MF-1, 43% for MF-2, 65% for MF-3 49% for MF-4 and 54% for MF-5.…”

Section: Energy Storage Capacity Melting Temperature and Encapsulatimentioning

confidence: 99%

Development of microencapsulated phase change material for solar thermal energy storage

Darkwa

Kokogiannakis

2017

Applied Thermal Engineering

120

View full text Add to dashboard Cite

In this paper a novel microencapsulated phase change material (MF-3) has been developed and tested for solar assisted hot water storage systems. Even though the morphology of the sample was affected by the type of emulsifier used for fabrication it recorded the highest energy storage capacity of 126 kJ/kg with encapsulation efficiency of 97.4% as compared with other developed samples. For the purpose of assessing its thermal effectiveness it was theoretically evaluated in a compacted fixed bed TES unit and found to be capable of achieving a higher energy storage density as well as relatively smaller physical storage size than water based system. Despite the overall effective thermal conductivity being slightly less than water, its value was still about twice as high as most current PCM storage units. Experimental evaluation is therefore strongly encouraged.

show abstract

“…The encapsulated PCMs cannot only maintain their microscopic solid form during the phase change processes to improve the ease of handling but also provide a large heat transfer area [13]. Most of the literatures indicated that both organic polymers and inorganic materials could be employed as shell materials to encapsulate PCMs through chemical processes; such as suspension polymerization [14], interfacial polycondensation [15], in situ polycondensation [16], in situ precipitation [17] and other special in situ processes [18]. These shell materials covered polyurea-formaldehyde resin [19], melamineformaldehyde resin, poly(methyl methacrylate) (PMMA) [20], polystyrene [21], CaCO 3 [22], SiO 2 [23], TiO 2 [24], Al 2 O 3 [25], and so more.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of a Novel Nanoencapsulated n-Eicosane Phase Change Material with Inorganic Silica Shell Material for Enhanced Thermal Properties through Sol-Gel Route

H.G¹,

Zhang²,

Qufu³

2017

J Textile Sci Eng

View full text Add to dashboard Cite

Synthesis and properties of microencapsulated n-octadecane with polyurea shells containing different soft segments for heat energy storage and thermal regulation

Cited by 251 publications

References 38 publications

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

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

Development of microencapsulated phase change material for solar thermal energy storage

Synthesis of a Novel Nanoencapsulated n-Eicosane Phase Change Material with Inorganic Silica Shell Material for Enhanced Thermal Properties through Sol-Gel Route

Contact Info

Product

Resources

About