Preparation and characterization of nano-encapsulated n-tetradecane as phase change material for thermal energy storage

Fang, Guiyin; Li, Hui; Yang, Fan; Liu, Xu; Wu, Shu-Pao

doi:10.1016/j.cej.2009.06.019

Cited by 316 publications

(90 citation statements)

References 11 publications

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“…The result showed reduction in the size of the capsules and uniformity was improved with an optimum emulsion speed of up to 8000 rpm. Fang et al [25] used a UF shell to encapsulate tetradecan PCM. The liquid was emulsified at 60℃ for 30min with an emulsion speed of 1500 rpm.…”

Section: In-situ Polymerizationmentioning

confidence: 99%

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

Darkwa

Kokogiannakis

2015

Renewable and Sustainable Energy Reviews

771

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: In-situ Polymerizationmentioning

confidence: 99%

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

Darkwa

Kokogiannakis

2015

Renewable and Sustainable Energy Reviews

771

267

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“…Paraffin wax, as a core material with urea formaldehyde as the shell material [59]; palmitic acid, as a core with aluminium oxyhydroxide (AlOOH) as the shell material [34]; hexadecane or octadecane, as a core with melamine-resin as the shell material [156]; higher hydrocarbons, as a core with amino-aldehyde resins as the shell material [157]; and N-hexadecane as a core with melamine-formaldehyde as the shell material, were encapsulated using this methodology. Through this process, capsules of a size range of 0.05-1100 µm [158][159][160] can be produced and it is capable of encapsulating many oil phase organic compounds [158]. Figure 4 represents the microencapsulation of essence oil by the process of in-situ polymerization [161].…”

Section: In-situ Polymerizationmentioning

confidence: 99%

Micro-Encapsulated Phase Change Materials: A Review of Encapsulation, Safety and Thermal Characteristics

2016

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Phase change materials (PCMs) have been identified as potential candidates for building energy optimization by increasing the thermal mass of buildings. The increased thermal mass results in a drop in the cooling/heating loads, thus decreasing the energy demand in buildings. However, direct incorporation of PCMs into building elements undermines their structural performance, thereby posing a challenge for building integrity. In order to retain/improve building structural performance, as well as improving energy performance, micro-encapsulated PCMs are integrated into building materials. The integration of microencapsulation PCMs into building materials solves the PCM leakage problem and assures a good bond with building materials to achieve better structural performance. The aim of this article is to identify the optimum micro-encapsulation methods and materials for improving the energy, structural and safety performance of buildings. The article reviews the characteristics of micro-encapsulated PCMs relevant to building integration, focusing on safety rating, structural implications, and energy performance. The article uncovers the optimum combinations of the shell (encapsulant) and core (PCM) materials along with encapsulation methods by evaluating their merits and demerits.

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“…The FTIR spectrum of GOT (Figure 4(a)) shows absorption peaks at 3280 cm −1 assigned for O-H stretching vibration [24,25] and 1384 cm −1 for C-O stretching vibration [26,27], and the peak at 1627 cm −1 can be assigned to the C=C ring stretching or H-O-H bending band of the adsorbed H 2 O molecules [28]. Moreover, the entire obvious characteristic for oxygen-containing functional groups (i.e., -COOH) can also be observed in the FTIR spectrum of GOT.…”

Section: Ftir Spectramentioning

confidence: 99%

Facile and Novel in-Plane Structured Graphene/TiO₂ Nanocomposites for Memory Applications

Shehata

Maksoud

Balboul

2018

Advances in Condensed Matter Physics

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Here, we report a simple strategy for the preparation of graphene/TiO 2 nanocomposite by UV-assisted incorporation of TiO 2 nanosol in graphene oxide (GO) dispersion. The proposed method is facile and of low cost without using any photocatalysts or reducing agents; this can open up a new possibility for green preparation of stable graphene dispersions in large-scale production. X-ray diffraction (XRD), Raman spectroscopy, Fourier transform infrared spectroscopy, and transmission electron microscopy (TEM) have been used to characterize carefully the as-prepared composites and to confirm the successful preparation of the nanocomposites. The average crystallite size of TiO 2 nanoparticles calculated from XRD pattern using Rietveld analysis is ∼35 nm. TEM measurements show the adsorption of TiO 2 onto graphene (G) sheets, which prevents the restacking of graphene sheets. Current-voltage and capacitance-voltage measurements were used to investigate the electrical resistive memory properties of GO, GO/TiO 2 , and G/TiO 2 thin films. Observed results show hysteresis behavior due to the charge trapping and detrapping process, indicating that the prepared thin films exhibit an excellent resistance switching memory characteristic for G/TiO 2 device.

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Preparation and characterization of nano-encapsulated n-tetradecane as phase change material for thermal energy storage

Cited by 316 publications

References 11 publications

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

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

Micro-Encapsulated Phase Change Materials: A Review of Encapsulation, Safety and Thermal Characteristics

Facile and Novel in-Plane Structured Graphene/TiO₂ Nanocomposites for Memory Applications

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Preparation and characterization of nano-encapsulated n-tetradecane as phase change material for thermal energy storage

Cited by 316 publications

References 11 publications

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

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

Micro-Encapsulated Phase Change Materials: A Review of Encapsulation, Safety and Thermal Characteristics

Facile and Novel in-Plane Structured Graphene/TiO2 Nanocomposites for Memory Applications

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Product

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Facile and Novel in-Plane Structured Graphene/TiO₂ Nanocomposites for Memory Applications