Microencapsulated n -alkane eutectics in polystyrene for solar thermal applications

Döğüşcü, Derya Kahraman; Kızıl, Çınar; Biçer, Alper; Sarı, Ahmet; Alkan, Cemil

doi:10.1016/j.solener.2017.11.072

Cited by 59 publications

(21 citation statements)

References 61 publications

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“…Qiu et al [19] and Li et al [20] have determined Ti for the melting peak of octadecane. The majority of researchers have defined Te [21,22,23,24,25,26,27,28,29,30,31] or Tp [19,20,29,31,32,33,34,35,36,37,38,39,40,41] as the melting temperature. Temperatures T* with insufficient information about their determination have been reported for DSC measurements [42,43,44,45,46,47,48,49,50,51], for adiabatic calorimeters (AC) [52,53,54,55] and for results which have been achieved with other not classified (NC) techniques [6,56,57,58,59,60,61,62].…”

Section: Literature Review Of Thermophysical Properties Of Octadecanementioning

confidence: 99%

“…As for the melting temperature, there are numerous results for the melting enthalpy of octadecane available in the literature. Many of these results were also obtained from the heat flow signal of DSC measurements, but without giving information about the way of determining the peak area which is the measure for the melting enthalpy [19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,47,48,49,50,51]. The peak area depends on the integration limits and the type of the assumed baseline of the heat flow signal [18].…”

Section: Literature Review Of Thermophysical Properties Of Octadecanementioning

confidence: 99%

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Review of Thermophysical Property Data of Octadecane for Phase-Change Studies

et al. 2019

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In this work we derive temperature-dependent functions for the most important material properties needed for phase change studies with octadecane. Over 80 references are reviewed in which at least one thermophysical property of octadecane is measured. The functions are valid ±40 K around the melting temperature and are surrounded by their confidence interval. It turns out that the values for the solid phase have much broader confidence intervals than the ones of the liquid phase. Hence, more accurate measurements are particularly desirable for the solid state material properties.

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Section: Literature Review Of Thermophysical Properties Of Octadecanementioning

confidence: 99%

Section: Literature Review Of Thermophysical Properties Of Octadecanementioning

confidence: 99%

Review of Thermophysical Property Data of Octadecane for Phase-Change Studies

et al. 2019

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“…As shown by a literature survey, many studies have examined PCMs for energy‐saving applications . Döğüşcü et al . reported a theoretical and experimental study of the use of n ‐heptadecane, n ‐octadecane (OD or C 18 ), n ‐nonadecane, n ‐eicosane, n ‐tetracosane, and their eutectic mixtures as PCMs with PSt shell materials.…”

Section: Introductionmentioning

confidence: 99%

“…In this sense, we believed that the preparation of an OD–HD mixture as a core material for encapsulation could reduce the T m of the resulting microencapsulated PCM to a value lower than 28.4°C and make it more appropriate for thermal energy storage systems operating at low temperatures. Furthermore, although there have been some works on paraffin–PSt and paraffin–PSt–DVB microcapsules, such as n ‐heptadecane–PSt–DVB, n ‐tetracosane and OD–PSt–DVB, and OD–PSt, and some n ‐alkanes, such as n ‐tetracosane, n ‐eicosane, n ‐nonadecane, OD, and n ‐heptadecane–PSt–DVB, in the literature, as far as we know there has been no work focusing on encapsulation of OD and HD simultaneously within a microsized poly(styrene‐ co ‐divinyl benzene) [poly(St‐ co ‐DVB)] shell in via the emulsion polymerization method. Moreover, it is known that HD used in the microencapsulation process is not only a PCM but also contributes as a coemulsifier for providing the stabilization of the emulsion system .…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of paraffin microcapsules for energy‐saving applications

Mert

Gumus

2019

J of Applied Polymer Sci

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A series of microencapsulated phase‐change materials (PCMs) with styrene–divinyl benzene shells composed of an n‐octadecane (OD or C18)–n‐hexadecane (HD or C16) mixture as the core were synthesized by an emulsion polymerization method. The effects of the core/shell ratio (C/S) and surfactant concentration (Csurf) on the thermal properties and encapsulation ratios of the PCMs were investigated. The chemical structures and morphological properties of the microcapsules were characterized by Fourier transform infrared (FTIR) spectroscopy and scanning electron microscopy analysis, respectively. The characteristic peaks of the paraffin mixtures and shell material located in the FTIR spectrum of the microencapsulated PCMs proved that the encapsulation of the PCM mixture was performed successfully. The thermal properties of the paraffin microcapsules were determined by differential scanning calorimetry (DSC) and thermogravimetric analysis. DSC analysis demonstrated that the microcapsules containing the maximum amount of paraffin mixture (C/S = 2:1) and the minimum Csurf (45 mmol/L) had the highest latent heat value of 88 kJ/kg and a latent heat of temperature of 21.06°C. Moreover, the maximum encapsulation ratio of the paraffin mixture was found to be 56.77%. With respect to the analysis results, the encapsulated binary mixture, which consisted of OD–HD with a poly(styrene‐co‐divinyl benzene) shell, is a promising material for thermal energy storage applications operating at low temperatures, such as in the thermal control of indoor temperatures and air‐conditioning applications in buildings for desirable thermal comfort and energy conservation. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47874.

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“…Microencapsulation of phase change materials (MEPCMs) is a process of coating PCM droplets with a shell to form microcapsules with diameters of nano‐ to micrometers. So far, many materials have been developed as shell materials to prepare microencapsulated PCMs, including inorganic materials, such as SiO 2 , TiO 2 , and CaCO 3 ; polymers, such as polyurethane, polystyrene, melamine resin, and acrylic; and biomacromolecules, such as silk fibroin, ethyl cellulose, and arabic gum . Melamine resin and acrylic polymers have been the most‐studied shell materials.…”

Section: Introductionmentioning

confidence: 99%

Efficient preparation and characterization of paraffin‐based microcapsules by emulsion polymerization

Yang

2019

J of Applied Polymer Sci

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Microencapsulated phase-change materials (MEPCMs) with paraffin as the core and poly(methyl methacrylate) (PMMA) and PMMA copolymers as the shell were prepared by emulsion polymerization using redox initiators at low temperatures. Fourier transform infrared spectroscopy was used to characterize the chemical composition of MEPCMs. The thermal properties and thermal stabilities of MEPCMs were tested by differential scanning calorimetry and thermogravimetric analysis. The morphologies and sizes of the microcapsules were investigated by scanning electron microscopy and particle size distribution analysis. The results indicated that the yield of microcapsules is as high as 96.2%, and the encapsulation efficiency of paraffin is nearly 100% when the paraffin content in MEPCM is 70%. The MEPCMs have good stability: the leakage ratios of MEPCMs can be less than 1% after 50 heating-cooling cycles. Therefore, the microencapsulation of paraffin using redox initiators has good production and application prospects.

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Microencapsulated n -alkane eutectics in polystyrene for solar thermal applications

Cited by 59 publications

References 61 publications

Review of Thermophysical Property Data of Octadecane for Phase-Change Studies

Review of Thermophysical Property Data of Octadecane for Phase-Change Studies

Preparation and characterization of paraffin microcapsules for energy‐saving applications

Efficient preparation and characterization of paraffin‐based microcapsules by emulsion polymerization

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