Preparation and characterization of capric-myristic-stearic acid eutectic mixture/modified expanded vermiculite composite as a form-stable phase change material

Wei, Haiting; Xie, Xiuzhen; Li, Xiangqi; Lin, Xingshui

doi:10.1016/j.apenergy.2016.06.109

Cited by 98 publications

(29 citation statements)

References 37 publications

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“…The modified VMT (MVMT) was separated by filtrated and washed with a large volume of distilled water to remove excess CTAB. The product was dried and ground until no Br − was detected by 0.1 mol AgNO 3 solution

CTAB solution \to_{70 ° normalC æ, 2 normalh}^{VMT} \to_{Washing}^{Filtrating} MVMT

…”

Section: Methodsmentioning

confidence: 99%

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Vermiculite/polyacrylamide copolymers microspheres for profile control in oilfields

Shen

Wang

et al. 2017

J of Applied Polymer Sci

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Polyacrylamide copolymers (PAMVT) microspheres were prepared through inverse emulsion polymerization by using acrylic acid (AA), 2-acrylamido-2-methylpropane sulfonic acid (AMPS) as functional monomers, N,N 0 -methylene bis-acrylamide (MBA) as crosslinker and modified vermiculite (MVMT) with the single-factor experiments. The initial and swelled particle sizes were tested through the dynamic light scattering (DLS). The swelled particle size under the optimum conditions could be 1.98 lm. The structure was characterized through Fourier transform infrared (FTIR), which indicated that vermiculite has successfully modified and the polymerization reaction was completed. The scanning electron microscopy (SEM) shows that MVMT was evenly filled with PAM copolymers. The water absorption capacity can be up to 80.2%. The recovery efficiency of the water flooding was increased from 69.33% to 77.56%. All these results indicated that the microspheres emulsions could be used as profile control agent to enhance the recovery efficiency.

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CTAB solution \to_{70 ° normalC æ, 2 normalh}^{VMT} \to_{Washing}^{Filtrating} MVMT

…”

Section: Methodsmentioning

confidence: 99%

“…In order to enhance the compatibility with PAM, an organic method was taken to modify the structure of VMT by using cetyl trimethylammonium bromide (CTAB). As a cationic surfactant, CTAB is easy to be intercalated into interlayer space of VMT . After modifying, VMT could obtain a bigger space to integrate with PAM copolymers .…”

Section: Introductionmentioning

confidence: 99%

Vermiculite/polyacrylamide copolymers microspheres for profile control in oilfields

Shen

Wang

et al. 2017

J of Applied Polymer Sci

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“…FS‐PCMs are composite materials composed of PCMs and a carrier matrix, where the shape of the working material remains unchanged when a phase change occurs. Common carrier substrates include expanded vermiculite, [7] expanded perlite, [8] diatomite, [9] expanded graphite, [10] foam metal, [11] and other porous materials. In recent years, FS‐PCMs are also used in the field of building energy saving, such as PCMs walls and wall panels, shutters, tiles and building blocks [12–15]…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Composite Phase Change Materials Based on Lauric‐Myristic Acid and Expanded Vermiculite with Carbon Layer

Liu

Zhang

et al. 2021

ChemistrySelect

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The low thermal conductivity and poor shape stability of phase change materials (PCMs) limit their application in the field of energy‐saving buildings. Lauric‐myristic acid (LA‐MA)/modified expanded vermiculite (MEV) composites as form‐stable phase change materials (FS‐PCMs) were prepared in this study. To improve their heat transfer properties, expanded vermiculite (EV) was impregnated with sucrose, starch and glucose solutions and then carbonized at a high temperature to attain MEVs, which act as a matrix in the PCMs. LA‐MA was adsorbed into the MEVs to obtain the LA‐MA/MEV FS‐PCMs. Scanning electron microscopy (SEM) shows that both EV and MEV have highly porous structures and can be used as PCMs carriers. The composite PCMs impregnated with starch obtain the best heat transfer properties in comparison with the other two samples. The melting temperature of the composite PCMs is 34.2 °C and the melting latent heat value is 141.9 J/g. Thermogravimetric analysis (TGA) shows that the composite PCMs present good thermal stability. Overall, LA‐MA/MEV FS‐PCMs are promising energy efficient materials that can be used as building materials.

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“…One main obstacle of these CPCMs affiliations is that paraffin in CPCMs flow since melting and cause to be unavoidable external the metal foams. To dominate the permeation difficulty, form‐stable phase changes materials (FSPCMs) which used polymer as the backing material, comprising high‐density polyethylene, 23,24 polyurethane, 25,26 polyethylene glycol, 27 expanded vermiculite, 28 and the ethylene‐vinyl acetate copolymers, 29 are practical in Li‐ion battery TM. The backing material may retain the form of the FSPCM in the solid‐mood when the temperature of the surrounding is superior to the melting spot of the PCM 30 .…”

Section: Introductionmentioning

confidence: 99%

Thermal behavior of lithium batteries used in electric vehicles using phase change materials

Bashirpour‐Bonab

2020

Int J Energy Res

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Electric vehicles equipped with lithium-ion batteries face a huge challenge, and the fact that battery life is very much affected by the temperature conditions of their operating environment, the heat reduces battery life cycle and time and increases the likelihood of thermal degradation and explosion. This problem has forced engineers to cool the battery. The methods used to cool the battery includes a cool water method (passing water or a dielectric fluid from the battery pack), cooling air (blowing air into the battery compartment by the fan), using a refrigeration system (such as cooling screens), and the use of phase-change material (PCM). In this research after reviewing and referring to valid authorities, it was found that PCMs are superior to all three other cooling systems because the airconditioning system is not very desirable due to the high-temperature gradient between the battery cells. Also, cooling and refrigeration systems with refrigerant gases will also cost a very high cost on the electric car. The results of the studies showed that the cooling the battery using the PCM creates a similar temperature profile between the batteries in the battery pack, the temperature gradient is much smaller than the air cooler and cool water, and the final cost will be much lower. Also, it performs more efficiently in high-speed road dynamics and increases the battery life of an electric car or electric hybrid. K E Y W O R D S electric vehicles, lithium-ion batteries, phase-change materials (PCMs), thermal energy storage (TES)

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Preparation and characterization of capric-myristic-stearic acid eutectic mixture/modified expanded vermiculite composite as a form-stable phase change material

Cited by 98 publications

References 37 publications

Vermiculite/polyacrylamide copolymers microspheres for profile control in oilfields

Vermiculite/polyacrylamide copolymers microspheres for profile control in oilfields

Preparation and Characterization of Composite Phase Change Materials Based on Lauric‐Myristic Acid and Expanded Vermiculite with Carbon Layer

Thermal behavior of lithium batteries used in electric vehicles using phase change materials

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