A novel core-shell structural montmorillonite nanosheets/stearic acid composite PCM for great promotion of thermal energy storage properties

Yi, Hao; Zhan, Weiquan; Zhao, Yunliang; Qu, Shuguo; Wang, Wei; Chen, Peng; Song, Shaoxian

doi:10.1016/j.solmat.2018.12.015

Cited by 100 publications

(29 citation statements)

References 57 publications

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“…Two conventional methods are used to overcome the low thermal conductivity and volume change of stearic acid: (1) Microencapsulating stearic acid as core material by different kinds of shells such as carbon materials [9,10,11], SiO 2 [12], and montmorillonite (MMT) [13]. Dao and Jeong [10] reported on the effect of ultra-thin graphene shell on the shape stability and thermal conductivity of stearic acid.…”

Section: Introductionmentioning

confidence: 99%

“…Lin et al [12] introduced graphene oxide on the surface of microencapsulated stearic acid/silica and found that the encapsulation efficiency reached 83.33% and the thermal conductivity was increased by 75%, compared with pure stearic acid. Yi et al [13] proposed a core-shell MMT/stearic acid composite with more than 80% stearic acid inside and the thermal conductivity was achieved with a 159.46% increase by MMT nanosheets. (2) Absorbing stearic acid into porous materials such as carbon materials, metal foams, dioxides, clays, expanded vermiculite (EV), and so on [14,15,16,17,18,19,20,21,22,23,24].…”

Section: Introductionmentioning

confidence: 99%

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Stearic Acid/Inorganic Porous Matrix Phase Change Composite for Hot Water Systems

Yang

2019

Molecules

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The storage and utilization of waste heat in low and medium temperature ranges using phase change materials (PCMs) is an effective technology to improve energy utilization efficiency in combined cooling, heating, and power (CCHP) systems. In this paper, stearic acid/inorganic porous matrix phase change composites were developed to store waste heat for hot water systems. Among them, stearic acid/expanded graphite (EG) phase change composite was highlighted and the thermal physical properties, the dynamic response, and the long-term cyclic stability were evaluated. The stearic acid concentrations in the composites were over 95 wt%. The thermal diffusion coefficients were 3–5 times higher than pure stearic acid, independent of composite densities. Accordingly, the heat storage and release times were decreased by up to 41% and 55%, respectively. After 100 cycles, the composites maintained good dynamic response and long-term cyclic stability, with heat storage density of 122–152 MJ/m3. Hence, this stearic acid/EG phase change composite exhibits excellent comprehensive performances. It is also easy to be prepared and flexible for various types of heat exchangers.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Stearic Acid/Inorganic Porous Matrix Phase Change Composite for Hot Water Systems

Yang

2019

Molecules

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“…The XRD patterns of MMT, MMTNS-1, and MMTNS-2 are shown in Figure 2 . The diffraction peaks of each sample could be readily indexed to the monoclinic crystal system of MMT (JCPDS 13-0135) [ 17 ], and no peaks of other materials were observed, which indicated the high purity of the raw material and the exfoliated products. Furthermore, the peak (001) of MMTNS-2 was much broader than that of MMT and MMTNNS-1, which indicated high exfoliation of MMTNS-2.…”

Section: Resultsmentioning

confidence: 99%

Correlation of Montmorillonite Sheet Thickness and Flame Retardant Behavior of a Chitosan–Montmorillonite Nanosheet Membrane Assembled on Flexible Polyurethane Foam

et al. 2019

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Polymer–clay membranes constructed via the layer-by-layer (LbL) assembly, with a nanobrick wall structure, are known to exhibit high flame retardancy. In this work, chitosan–montmorillonite nanosheet (CH–MMTNS) membranes with different thickness of MMTNS were constructed to suppress the flammability of flexible polyurethane (FPU) foam. It was found that a thinner MMTNS membrane was more efficient in terms of reducing the flammability of the FPU foam. This was because such MMTNS membrane could deposit cheek by jowl and form a dense CH–MMTNS membrane on the foam surface, thus greatly limiting the translation of heat, oxygen, and volatile gases. In contrast, a thicker MMTNS constructed a fragmentary CH–MMTNS membrane on the coated foam surface, due to its greater gravity and weaker electrostatic attraction of chitosan; thus, the flame retardancy of a thick MMTNS membrane was lower. Moreover, the finding of different deposition behaviors of MMTNS membranes with different thickness may suggest improvements for the application of clay with the LbL assembly technology.

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“…In the spectrum of SA/Kaol, three vibration modes of C−OH are observable: 1433 cm −1 (the in‐plane bending vibration), 1301 cm −1 (the stretching vibration) and 912 cm −1 (the out‐of‐plane bending vibration). And an adsorption peak appears at 1702 cm −1 associated with the stretching vibration of C=O, indicating the presence of closed‐loop SA dimmers . Indeed, not only in solid but also in liquid phase, carboxylic acids usually exist in the form of closed‐loop dimmers through H‐bonds owing to the strong electronegativity of O atom of carboxyl groups (marked by flaxen block in Figure b and illustrated in Figure )…”

Section: Resultsmentioning

confidence: 99%

Thermal Performance and Interfacial Aspects of Kaolinite‐Based Stearic Acid Composite in the Presence of Nitric Acid

Yang

Zuo

et al. 2019

ChemistrySelect

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The effect of nitric acid on the thermal performance of stearic acid/kaolinite (SA/Kaol) composite phase change materials (PCMs) was studied. SA/Kaol was subjected to HNO3 manipulations at different acidity conditions. The results indicated that inferior thermal properties were detected at the acid‐treated composites with pH < 2. The latent heat value of SA/Kaol‐0.5 demonstrated an obvious reduction of about 30% compared with that of SA/Kaol, and its supercooling extent could reach as many as 11.2 °C while that of SA/Kaol was only 1.4 °C. Based on interfacial reaction analysis, the reduced crystallinity of SA should be attributed to the confinement effect originated from acid molecular clusters, while the supercooling behavior was caused by external ions. These ions could hinder SA molecules from adsorbing to the surface of crystal nucleus and thus delay the solidification process. As a result of segregation effect, the latent heat value of acid‐treated samples was deteriorated but the supercooling extent was relieved during thermal cycles. This work was the first that reported the effect of nitrogen oxides on PCMs. We believe that the results could play an enlightening role in the stability study of thermal property during PCMs practical applications.

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A novel core-shell structural montmorillonite nanosheets/stearic acid composite PCM for great promotion of thermal energy storage properties

Cited by 100 publications

References 57 publications

Stearic Acid/Inorganic Porous Matrix Phase Change Composite for Hot Water Systems

Stearic Acid/Inorganic Porous Matrix Phase Change Composite for Hot Water Systems

Correlation of Montmorillonite Sheet Thickness and Flame Retardant Behavior of a Chitosan–Montmorillonite Nanosheet Membrane Assembled on Flexible Polyurethane Foam

Thermal Performance and Interfacial Aspects of Kaolinite‐Based Stearic Acid Composite in the Presence of Nitric Acid

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