Enhanced thermal conductivity of form-stable phase change composite with single-walled carbon nanotubes for thermal energy storage

Qian, Tingting; Li, Jinhong; Feng, Wuwei; Nian, Hongen

doi:10.1038/srep44710

Cited by 50 publications

(31 citation statements)

References 17 publications

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“…Figures 6 a,b show the thermal degradation of CDs and CDs-PEG synthesized by hydrothermal carbonization at the same condition at 220 °C for 6 h. It was observed that CDs-220C-6h showed the slow decomposition according to the heating time, however CDs-PEG showed the rapid degradation at temperature 400 °C regarding the breakdown of PEG molecules passivated on CDs. From the previous report, PEG (Mw = 6000) was thermally decomposed starting from 250 to 400 °C for complete decomposition of PEG 50 . With narrow DTG peak from CDs-PEG illustrated in Fig.…”

Section: Resultsmentioning

confidence: 99%

Facile preparation of aqueous-soluble fluorescent polyethylene glycol functionalized carbon dots from palm waste by one-pot hydrothermal carbonization for colon cancer nanotheranostics

Sangjan

Boonsith

Sansanaphongpricha

et al. 2022

Sci Rep

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Carbon dots (CDs) are categorized as an emerging class of zero-dimension nanomaterials having high biocompatibility, photoluminescence, tunable surface, and hydrophilic property. CDs, therefore, are currently of interest for bio-imaging and nano-medicine applications. In this work, polyethylene glycol functionalized CDs (CD-PEG) were prepared from oil palm empty fruit bunch by a one-pot hydrothermal technique. PEG was chosen as a passivating agent for the enhancement of functionality and photoluminescence properties of CDs. To prepare the CDs-PEG, the effects of temperature, time, and concentration of PEG were investigated on the properties of CDs. The as-prepared CDs-PEG were characterized by several techniques including dynamic light scattering, high-resolution transmission electron microscopy, X-ray photoelectron spectroscopy, fluorescence spectroscopy, Raman spectroscopy, Fourier-transform infrared spectroscopy and Thermogravimetric analysis. The as-prepared CDs under hydrothermal condition at 220 °C for 6 h had spherical morphology with an average diameter of 4.47 nm. Upon modification, CDs-PEG were photo-responsive with excellent photoluminescence property. The CDs-PEG was subsequently used as a drug carrier for doxorubicin [DOX] delivery to CaCo-2, colon cancer cells in vitro. DOX was successfully loaded onto CDs-PEG surface confirmed by FT-IR and Matrix-Assisted Laser Desorption/Ionization Time-of-Flight Mass Spectrometer (MALDI-TOF/MS) patterns. The selective treatment of CDs-PEG-DOX against the colorectal cancer cells, , relative to normal human fibroblast cells was succesfully demonstrated.

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Section: Resultsmentioning

confidence: 99%

Facile preparation of aqueous-soluble fluorescent polyethylene glycol functionalized carbon dots from palm waste by one-pot hydrothermal carbonization for colon cancer nanotheranostics

Sangjan

Boonsith

Sansanaphongpricha

et al. 2022

Sci Rep

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“…In Table 6, the increment ratios in thermal conductivities of the composite PCMs with CNT doping were compared to different clay-based composite PCMs doped with carbon-based additives. 37,67–73 As obviously seen, especially in case of 5 wt% CNTs adding, the increase percentage in thermal conductivity was higher than that of most of the CPCMs. This evaluation exhibits that the improvement in thermal conductivity of the CPCMs can be changed considerably depending on the thermal conductivity of main supporting matrix, additive material and their mass fractions.…”

Section: Resultsmentioning

confidence: 81%

Effects of carbon nanotubes additive on thermal conductivity and thermal energy storage properties of a novel composite phase change material

Sarı

Biçer

Hekimoğlu

2018

Journal of Composite Materials

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Fatty acids are commonly preferred as phase change materials for passive solar thermoregulation due to their several advantageous latent heat thermal energy storage (LHTES) properties. However, further storage container requirement of fatty acids against leakage problem during heating period and also low thermal conductivity significantly limit their application fields. To overcome these drawbacks of capric acid–stearic acid eutectic mixture as phase change material, it was first impregnated with expanded vermiculite clay by melting/blending method and then doped with carbon nanotubes. The effects of carbon nanotubes additive on the chemical/morphological structures and LHTES properties of the composite phase change material and thermal enhanced change phase change materials were investigated by scanning electron microscope, Fourier transform infrared spectroscopy, X-ray diffraction, differential scanning calorimetry and thermogravimetric analysis analysis techniques. The differential scanning calorimetry results showed that the form-stable composite phase change materials and thermal enhanced composite phase change materials have melting temperatures in the range of 24.35–24.64℃ and latent heat capacities between 76.32 and 73.13 J/g. Thermal conductivity of the composite phase change materials was increased as 83.3, 125.0 and 258.3% by carbon nanotubes doping 1, 3 and 5 wt%. The heat charging and discharging times of the thermal enhanced -composite phase change materials were reduced appreciably due to the enhanced thermal conductivity without notably influencing their LHTES properties. Furthermore, the thermal cycling test and thermogravimetric analysis findings proved that all fabricated composites had admirable thermal durability, cycling LHTES performance and chemical stability.

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“…This can be explained by two cases: First, since the CA is held in the porous structure of both carbon materials by the capillary and surface tension forces, its movement which causes the delay of its crystallization is restricted, thereby become more quickly solidified 40 . The second case might be that the supporting CHW and ACHW materials provide heat conduction paths, thereby accelerating the phase transition speed of the CA 20 …”

Section: Resultsmentioning

confidence: 99%

“…During the melting and solidification phase transformations, PCMs perform LHTES function, while the supporter materials prevents PCM seepage in liquid state and ensures the solid shape to be fully preserved 12‐16 . Some of the porous materials commonly used in the production of shape stable composites are attapulgite, 17 expanded perlite, 18 sepiolite, 11 vermiculite, 19 diatomite 14,20 and silica fume 8,21 . However, many of these materials themselves have low thermal conductivity and hence it is obvious that they cannot help increase the thermal conductivity of PCMs.…”

Section: Introductionmentioning

confidence: 99%

Carbonized waste hazelnut wood‐based shape‐stable composite phase change materials for thermal management implementations

et al. 2021

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Summary Two kinds of new bio‐chars were produced from carbonization of waste hazelnut wood as low‐cost and eco‐friendly supporting matrices to simultaneously solve the seepage and low thermal conductivity problem of capric acid (CA) used as a phase change materials (PCM) for thermal management applications. In the prepared seepage‐free composites, the CA was impregnated by 52 and 64 wt% into porous structure of carbonized hazelnut wood (CHW) and activated carbonized hazelnut wood (ACHW), respectively. The SEM analysis exhibited that the CA was well confined by CHW and ACHW. FTIR and XRD investigations confirmed the existence of good chemical compatibility between CA and CHW/or ACHW. DSC results indicated that the seepage‐free CHW/CA and ACHW/CA composites have melting points of 28.5°C and 28.9°C, and melting enthalpies of 111.3 and 110.3 J/g, respectively. TG analyses revealed that the functioning temperatures of the composites were considerably lower than their thermal degradation temperatures. The LHTES properties and chemical structure of the composites was not altered throughout 1000‐cycling thermal test. The thermal conductivity of CHW/CA and ACHW/CA were 2.70 to 3.05 times higher than that of pure CA. The decrease in melting/solidification time of the composites proved the improvement in their thermal conductivities compared with pure CA. Consequently, the produced bio‐chars can be evaluated as supporter and thermal conductivity enhancer materials (TCEMs) for PCMs; besides, the fabricated composite PCMs can be considered as hopeful admixtures to fabricate of cost‐effective, eco‐friendly and energy‐efficient new types of mortar, concrete and plaster which can be used for thermal management implementations in buildings.

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Enhanced thermal conductivity of form-stable phase change composite with single-walled carbon nanotubes for thermal energy storage

Cited by 50 publications

References 17 publications

Facile preparation of aqueous-soluble fluorescent polyethylene glycol functionalized carbon dots from palm waste by one-pot hydrothermal carbonization for colon cancer nanotheranostics

Facile preparation of aqueous-soluble fluorescent polyethylene glycol functionalized carbon dots from palm waste by one-pot hydrothermal carbonization for colon cancer nanotheranostics

Effects of carbon nanotubes additive on thermal conductivity and thermal energy storage properties of a novel composite phase change material

Carbonized waste hazelnut wood‐based shape‐stable composite phase change materials for thermal management implementations

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