Design and synthesis of multifunctional microencapsulated phase change materials with silver/silica double-layered shell for thermal energy storage, electrical conduction and antimicrobial effectiveness

Zhang, Xiaoyu; Wang, Xiaodong; Wu, Dezhen

doi:10.1016/j.energy.2016.06.017

Cited by 108 publications

(61 citation statements)

References 65 publications

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“…The thermograms are displayed in Figure , and the specific data of the phase‐change characteristic are presented in Table . From Figure , the melting temperature ( T m ) and crystallization temperature ( T c ) of all of the microPCMs were found to shift to slightly lower temperatures in comparison with those of C18 because the microPCMs had bigger surface areas and the motion of C18 was confined inside a narrow space . As shown in Figure (a,b), C18 and the microPCMs exhibited a single endothermic peak during the heating process, and C18 had a single exothermic peak, but the microPCMs appeared to have multiple exothermic peaks during the cooling process.…”

Section: Resultsmentioning

confidence: 90%

“…In addition, the crystallization enthalpy (Δ H c ) and melting enthalpy (Δ H m ) of the microPCMs were found to decrease significantly in comparison with those of C18. The shell and modified CNTs never underwent any phase change, and only C18 as a PCM could release and store latent heat in the DSC scanning temperature range . Therefore, the phase‐change enthalpies of the microPCMs were mainly influenced by the core–shell weight ratio.…”

Section: Resultsmentioning

confidence: 99%

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Improvements in the thermal conductivity and mechanical properties of phase‐change microcapsules with oxygen‐plasma‐modified multiwalled carbon nanotubes

Sun

Wang

Liu

et al. 2017

J of Applied Polymer Sci

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The thermal properties and mechanical properties are the key factors of phase‐change microcapsules (microPCMs) in energy‐storage applications. In this study, microPCMs based on an n‐octadecane (C18) core and a melamine–urea–formaldehyde (MUF) shell supplemented with O2‐plasma‐modified multiwalled carbon nanotubes (CNTs) were synthesized through in situ polymerization. Meanwhile, two different addition methods, the addition of modified CNTs into the emulsion system or into the polymer system, were compared and examined. Scanning electron microscopy micrographs showed that the microPCMs were spherical and had a broadened size distribution. Fourier transform infrared testing demonstrated that the modified CNTs did not affect C18 coated by MUF resin. The results indicate that the thermal conductivity and mechanical properties of the microPCMs were remarkably improved by the addition of a moderate amount of modified CNTs, but the heat enthalpy and encapsulated efficiency decreased slightly. Moreover, the thermal conductivity and mechanical properties of microPCMs modified with CNTs directly added to the polymer system were superior to those with CNTs added to emulsion system. In particular, when 0.2 g of modified CNTs were added to the polymer system, the thermal conductivity of the microPCMs was improved by 225%, and the breakage rates of the microPCMs at 4000 rpm for 5, 10, and 20 min decreased by 74, 72, and 60%, respectively, compared with that of the microPCMs without modified CNTs. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45269.

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Section: Resultsmentioning

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Improvements in the thermal conductivity and mechanical properties of phase‐change microcapsules with oxygen‐plasma‐modified multiwalled carbon nanotubes

Sun

Wang

Liu

et al. 2017

J of Applied Polymer Sci

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“…This technique ensures the crystalline structure of microcapsule/nanocapsule preferably suitable for inorganic shell materials. For instance, Zhang et al presented the XRD results of Ag/SiO 2 double‐layered micro‐PCM with n ‐eicosane as a core material to investigate the crystalline structure at different reaction time. The good crystallinity was retrained of silica layer on microcapsules surface and only an amorphous silica shell was fabricated onto the n ‐eicosane core.…”

Section: Characteristics Evaluation Techniques Of Epcmsmentioning

confidence: 99%

“…Normally, the EDS technique is carried out in conjunction with scanning electron microscopy (SEM). Zhang et al performed the EDS analysis to investigate the surface elemental distribution of Ag/SiO 2 double‐layered microcapsules with n ‐eicosane as a core material along with atomic percentage. Ma et al determined the chemical elements and purity of paraffin@TiO 2 microcapsules and confirmed the formation of TiO 2 shell onto the surface of paraffin wax.…”

Section: Characteristics Evaluation Techniques Of Epcmsmentioning

confidence: 99%

The micro‐/nano‐PCMs for thermal energy storage systems: A state of art review

et al. 2019

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Summary With advancement in technology—nanotechnology, various thermal energy storage (TES) materials have been invented and modified with promising thermal transport properties. Solid‐liquid phase change materials (PCMs) have been extensively used as TES materials for various energy applications due to their highly favourable thermal properties. The class of PCMs, organic phase change materials (OPCMs), has more potential and advantages over inorganic phase change materials (IPCMs), having high phase change enthalpy. However, OPCMs possess low thermal conductivity as well as density and suffer leakage during the melting phase. The encapsulation technologies (ie, micro and nano) of PCMs, with organic and inorganic materials, have a tendency to enhance the thermal conductivity, effective heat transfer, and leakage issues as TES materials. The encapsulation of PCMs involves several technologies to develop at both micro and nano levels, called micro‐encapsulated PCMs (micro‐PCM) and nano‐encapsulated PCMs (nano‐PCM), respectively. This study covers a wide range of preparation methods, thermal and morphological characteristics, stability, applications, and future perspective of micro‐/nano‐PCMs as TES materials. The potential applications, such as solar‐to‐thermal and electrical‐to‐thermal conversions, thermal management, building, textile, foam, medical industry of micro‐ and nano‐PCMs, are reviewed critically. Finally, this review paper highlights the emerging future research paths of micro‐/nano‐PCMs for thermal energy storage.

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“…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

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Design and synthesis of multifunctional microencapsulated phase change materials with silver/silica double-layered shell for thermal energy storage, electrical conduction and antimicrobial effectiveness

Cited by 108 publications

References 65 publications

Improvements in the thermal conductivity and mechanical properties of phase‐change microcapsules with oxygen‐plasma‐modified multiwalled carbon nanotubes

Improvements in the thermal conductivity and mechanical properties of phase‐change microcapsules with oxygen‐plasma‐modified multiwalled carbon nanotubes

The micro‐/nano‐PCMs for thermal energy storage systems: A state of art review

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

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