Effect of different amounts of surfactant on characteristics of nanoencapsulated phase-change materials

Li, Ming Guang; Zhang, Yang; Xu, Yunhua; Zhang, Dong

doi:10.1007/s00289-011-0492-1

Cited by 52 publications

(19 citation statements)

References 21 publications

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“…For instance, Tseng et al [18] and Jin et al [19] encapsulated paraffin waxes as MEPCM with a PUF shell at the F/U molar ratio of 1.5:1. Li et al [20] and Xin et al [21] fabricated the PUF shell at the F/U molar ratio of around 2:1. Zhang et al [22] and Fang et al [23] were also able to enlarge the F/U ratio to 3.34:1 and 3.45:1, respectively, for the fabrication of PUF shells.…”

Section: Introductionmentioning

confidence: 99%

Microencapsulation of Paraffin with Poly (Urea Methacrylate) Shell for Solar Water Heater

Zhou

et al. 2019

Energies

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Previous research has demonstred that microencapsulated phase change materials (MEPCMs) could significantly increase the energy storage density of solar thermal energy storage (TES) systems. Compared with traditional phase change materials (PCMs), MEPCMs have many advantages since they can limit their exposure to the surrounding environment, enlarge the heat transfer area, and maintain the volume as the phase change occurs. In this study, a new MEPCM for solar TES systems is developed by encapsulation of paraffin wax with poly (urea formaldehyde) (PUF). The experimental results revealed that agglomeration of MEPCM particles occurred during the encapsulation process which affected the uniformity of the particle size distribution profile when sodium dodecyl sulfate was used as an emulsifier. The differential scanning calorimetric (DSC) analysis results showed that the melting temperatures were slightly increased by 0.14–0.72 °C after encapsulation. A thermogravimetric (TG) test showed that the sample weight decreased while the weight loss starting temperature was slightly increased after encapsulation. Overall, the sample UF-2, fabricated with the binary emulsifiers of Brij 35 and Brij 30 and 5% nucleating agent, resulted in good particle dispersion and shell integrity, higher core material content and encapsulation efficiency, as well as improved thermal stability.

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Section: Introductionmentioning

confidence: 99%

Microencapsulation of Paraffin with Poly (Urea Methacrylate) Shell for Solar Water Heater

Zhou

et al. 2019

Energies

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“…Maximum phase change enthalpy of 98.8 J/g and encapsulation efficiency of 82.2% were obtained with 3% mass ratios of polymerizable emulsifier (DNS-86)/core material and 2% co-emulsifier (hexadecane (HD))/core material. Li et al [62] successfully synthesized NEPCM with the two-step miniemulsion polymerization method and achieved a mean particle diameter of 270nm. The experimental results did reveal that by increasing the amount of surfactant material (sodium dodecyl sulphate (SDS)) the phase-change enthalpy of the nanocapsules did also increase but the mean particle size was reduced.…”

Section: Emulsion/miniemulsion Polymerizationmentioning

confidence: 99%

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

Darkwa

Kokogiannakis

2015

Renewable and Sustainable Energy Reviews

748

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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“…The distinguishing characteristic of in situ polymerization is that there are no reactants in the core material compared to interfacial polymerization [4]. Suitable polymers, such as poly(urethane-urea) [13][14][15][16][17], polyurea-formaldehyde [6,18,19], polyurea [20] and polystyrene [21] can be manufactured in one of these ways.…”

Section: Introductionmentioning

confidence: 99%

In situ preparation and characterization of encapsulated high-chain fatty acid ester-based phase change material (PCM) in poly(urethane-urea) by using amino alcohol

Aydın

2013

Chemical Engineering Journal

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Effect of different amounts of surfactant on characteristics of nanoencapsulated phase-change materials

Cited by 52 publications

References 21 publications

Microencapsulation of Paraffin with Poly (Urea Methacrylate) Shell for Solar Water Heater

Microencapsulation of Paraffin with Poly (Urea Methacrylate) Shell for Solar Water Heater

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

In situ preparation and characterization of encapsulated high-chain fatty acid ester-based phase change material (PCM) in poly(urethane-urea) by using amino alcohol

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