Preparation and application of low-temperature binary eutectic lauric acid-stearic acidSiO2 phase change microcapsules

Wang, Baoming; Shi, Min; Yao, Huaiying; Yang, Xin; Guo, Shuang; Liu, Yong; Hua, Quanxian; Shen, Bo; Liu, Pengfeï; Tang, Jianwei

doi:10.1016/j.enbuild.2022.112706

Cited by 23 publications

(4 citation statements)

References 40 publications

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“…As illustrated in Figure 3, LA demonstrates seven characteristic peaks at 2912, 2849, 1693, 1470, 1302, 942, and 720 cm −1 . The absorption peak at 2912 cm −1 corresponds to the stretching vibration of the –CH 3 group, [ 33 ] and the absorption peak at 2849 cm −1 is caused by the stretching vibration of the –CH 2 group. [ 34 ] The stretching vibration associated with the C═O group in LA can be observed at a characteristic peak of 1693 cm −1 .…”

Section: Resultsmentioning

confidence: 99%

“…[ 35 ] The peak observed at 1470 cm −1 corresponds to the shear flexion vibrations of –CH 2 and –CH 3 . [ 33,36 ] The absorption peaks at 942 and 1302 cm −1 are ascribed to the out‐of‐plane bending vibration and the in‐plane bending vibration of the hydroxyl (–OH) group. [ 37,38 ] The peak at 721 cm −1 is attributed to the in‐plane swinging vibration of the –CH 2 group.…”

Section: Resultsmentioning

confidence: 99%

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Preparation and Thermal Performances of Lauric Acid/Polyvinyl Butyral/Graphene Nanoplates Composite Phase Change Materials

Wang,

Fu,

Fang

2024

Physica Status Solidi (a)

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In recent years, there has been significant progress in the development and application of phase change materials (PCMs) for thermal energy storage. The new lauric acid (LA)/polyvinyl butyral (PVB)/graphene nanoplates (GNP) composite phase change materials (CPCM) are prepared using the solution blending method, in which LA acts as PCM, PVB serves as support material, and GNP is used as thermally conductive enhancer. The prepared CPCM with 80 wt% LA can retain stable shape without leakage. The Fourier‐transform infrared and X‐ray diffractometer results indicate that there is no chemical reaction among the various components of the CPCM. The differential scanning calorimeter results show the CPCM3 (with 80 wt% LA and 5 wt% GNP) has melting latent heat of 134.41 KJ Kg−1 with melting temperature of 41.73 °C. The thermal conductivity tests present that thermal conductivity of CPCM3 is 0.689 W (m K)−1, which is 3.83 times that of the PCM2. The thermogravimetric analyzer results verify that the CPCM possess good thermal stability within the operating temperature range of 35–45 °C without any degradation. The thermal cycling tests indicate that CPCM have good thermal reliability. Therefore, it has promising applications in building energy conservation, solar thermal systems, thermal management, and textiles.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Preparation and Thermal Performances of Lauric Acid/Polyvinyl Butyral/Graphene Nanoplates Composite Phase Change Materials

Wang,

Fu,

Fang

2024

Physica Status Solidi (a)

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“…where, Tm is the melting temperature of mixture (K) Ti is the melting temperature of the ith substance (K) Xi is the molar fraction of the ith substance Hi is the latent heat of the ith substance (J•mol −1 ) R is gas constant (8.315 J•mol −1 •K −1 ) Wang et al [30] prepared a low-eutectic temperature microcapsule material by encapsulating the lauric acid and stearic acid binary eutectic material as the core in the silica shell. When the encapsulation rate reached 80.98%, the phase transition temperature was 27.9 °C and the latent heat was 170.3 J/g.…”

Section: Eutectic Materialsmentioning

confidence: 99%

Types of Phase Change Materials and Encapsulated Methods for Microcapsules in Cold Storage: Review and One Case Study

Zhang,

Rao

et al. 2024

Preprint

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The preparation of phase change materials(PCMs) provides promising solutions for the technology implementation and popularization of renewable energy in both industries of thermal and refrigeration industries. This work focuses on the low temperature PCMs using in energy storage. The cutting-edge PCMs are expected to provide flexible temperature according to the preservation temperature of application systems. Moreover, the microencapsulated PCM (m-PCM) is potential to improve both the energy storage and refrigeration system performance by decreasing the leakage of the PCM and providing a better thermal conductivity.In this regard, this paper provides a guided technological tour on the materials selection and the preparation methods for the m-PCMs, which remains elusive in the field of low temperature energy storage. Based on the comparative analysis on the existing researches, the effects and potential of different materials and preparation methods on the thermal properties of m-PCMs were summarized and demonstrated. At last, a novel m-PCM with the ntetradecane as core and polystyrene as shell, as well as its corresponding efficient preparation method was preliminarily proposed and tested to verify its improvement.

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“…The organic-based SLPCM microcapsules have certain limited applications due to the flammable features and low thermal conductivity of organic-based shells [ 12 ]. In comparison to organic-based shells, inorganic-based shells demonstrate nonflammability, better thermal conductivity, higher mechanical strength, and higher stiffness [ 13 , 14 ]. Therefore, the inorganic-based SLPCM microcapsules exhibited a fast thermal response and an enhanced heat transfer for reversible and recyclable heat energy storage and release, which have been widely studied in recent years.…”

Section: Introductionmentioning

confidence: 99%

Multifunctional BiOI/SiO2/Fe3O4@n-Docosane Phase-Change Microcapsules for Waste Heat Recovery and Wastewater Treatment

2023

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Waste heat and organic contaminants are significant issues in water pollution, which has caused ecological problems and threatened human health. To provide an effective solution for wastewater recovery, we designed a novel type of multifunctional phase-change microcapsule. This type of microcapsule was synthesized using n-docosane as a core and a SiO2/Fe3O4 composite as a base shell through in situ interfacial polycondensation with the assistance of a Fe3O4 nanoparticle as a Pickering emulsion stabilizer, followed by the deposition of BiOI nanosheets on the surface of the SiO2/Fe3O4 composite shell. Benefiting from the n-docosane core, the resultant microcapsules obtained phase-change enthalpies of 46.8–115.7 J/g for absorbing waste heat from wastewater. The deposited BiOI nanosheets promoted photocatalysis for the microcapsules to degrade organic contaminants in wastewater. Owing to the magnetic response of the Fe3O4 nanoparticles, the separability and recyclability of the microcapsules were improved significantly by magnetic separation. Moreover, the microcapsules demonstrate outstanding phase-change reversibility, thermal cycling stability, and shape stability due to the tight SiO2/Fe3O4 composite shell. This study provides a promising approach for designing and developing multifunctional phase-change microcapsules for waste heat recovery and wastewater treatment.

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Preparation and application of low-temperature binary eutectic lauric acid-stearic acidSiO2 phase change microcapsules

Cited by 23 publications

References 40 publications

Preparation and Thermal Performances of Lauric Acid/Polyvinyl Butyral/Graphene Nanoplates Composite Phase Change Materials

Preparation and Thermal Performances of Lauric Acid/Polyvinyl Butyral/Graphene Nanoplates Composite Phase Change Materials

Types of Phase Change Materials and Encapsulated Methods for Microcapsules in Cold Storage: Review and One Case Study

Multifunctional BiOI/SiO2/Fe3O4@n-Docosane Phase-Change Microcapsules for Waste Heat Recovery and Wastewater Treatment

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