The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Jindun Liu - One of the best experts on this subject based on the ideXlab platform.
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recent advances in Halloysite Nanotube derived composites for water treatment
Environmental science. Nano, 2016Co-Authors: Huixian Wang, Yatao Zhang, Bin Zhang, Jindun LiuAbstract:Halloysite Nanotubes (HNTs) are naturally occurring clay mineral with nanotubular structures and have found increasing potential applications in industrial fields. Here, after a brief introduction of the general structure, main properties and newly emerging applications of HNTs, particular attention is paid to HNT-derived applications in water treatment. We mainly review the recent progress in applications of HNT-derived nanocomposites in heavy metal ion, dye or organic pollutant removal from wastewater and HNT-containing membranes for water filtration. The HNT-derived composites exhibit superior properties for water treatment in various ways and are promising to be used in practical applications. Finally, we summarize the predominant mechanisms acting in the applications of water treatment and future prospects are discussed.
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preparation and antibacterial activity of copper nanoparticle Halloysite Nanotube nanocomposites via reverse atom transfer radical polymerization
RSC Advances, 2014Co-Authors: Xiaoxu Ding, Huixian Wang, Weihang Chen, Jindun Liu, Yatao ZhangAbstract:Copper nanoparticle supported Halloysite Nanotubes with a 15 nm lumen and 30 nm external diameter via surface initiation reverse atom transfer radical polymerization were fabricated and showed good antibacterial activity against Escherichia coli (E. coli).
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potent antibacterial activity of a novel silver nanoparticle Halloysite Nanotube nanocomposite powder
Journal of Inorganic Biochemistry, 2013Co-Authors: Yatao Zhang, Bing Zhang, Haoqin Zhang, Yifeng Chen, Jindun LiuAbstract:Halloysite Nanotubes (HNTs), natural Nanotube, have been developed as a support for loading of antibacterial agents. Firstly, HNTs were modified by silane coupling agent (KH-792). And then, modified HNTs were immersed in silver nitrate solution and a complex reaction between the two amino groups of KH-792 and silver ions formed, leading to large clusters on the surface of HNTs. Finally, these silver containing clusters were converted into silver nanoparticles (Ag NPs) with about 5nm diameter by reduction process. A new antibacterial agent, Ag NPs/HNTs, was characterized by X-ray fluorescence (XRF), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM) and scanning transmission electron microscopy-energy dispersive X-ray analysis (STEM-EDX). The antibacterial test indicated that Ag NPs/HNTs showed good antibacterial performance against Gram-negative bacteria (Escherichia coli) and Gram-positive bacteria (Staphylococcus aureus).
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Halloysite Nanotube fe3o4 composite for removal of methyl violet from aqueous solutions
Desalination, 2012Co-Authors: Jingmin Duan, Ruichao Liu, Tong Chen, Bing Zhang, Jindun LiuAbstract:Abstract The magnetic composite of Fe3O4-Halloysite Nanotube (HNT) was prepared by chemical precipitation method. The prepared adsorbents were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), vibrating sample magnetometer (VSM), and multipoint Brunauer–Emmett–Teller (MBET). The results revealed that Fe3O4 particles with diameter of 3–5 nm dispersed on the Nanotube surface and formed a composite with Halloysite. The Fe3O4–HNTs composite exhibited fine magnetic property (Ms = 8.47 emu/g) and could be easily separated from aqueous solution by the application of an external magnetic field. Adsorption results showed that Fe3O4–HNTs composite could maintain a high adsorption capacity for methyl violet (MV) when the pH, concentration of metal ion and temperature varied. Adsorption kinetics was best described by the pseudo-second-order model. Equilibrium data fitted well with the Langmuir isotherm. The used Fe3O4–HNTs could be regenerated by simple calcinations. The recovered adsorbents could be used again for MV removal and magnetic separation. Because of the excellent adsorption capacity at different conditions, reproducibility and separability, Fe3O4–HNTs composite is a promising candidate for removing cationic dye from waste water.
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the removal of dye from aqueous solution using alginate Halloysite Nanotube beads
Chemical Engineering Journal, 2012Co-Authors: Lin Liu, Bing Zhang, Yazhen Wan, Yinde Xie, Rui Zhai, Jindun LiuAbstract:Abstract The Halloysite Nanotube (HNT) has already been extensively investigated to remove various organic pollutants and metal ions, and how to prepare the beads with excellent absorbability, stability, and reusability is critical to its practical application. In this study, we prepared a new kind of porous beads by immobilizing Halloysite Nanotubes with alginate (Alg). The as-prepared product was characterized by scanning electron microscope (SEM). The SEM image shows that hybrid bead is a porous structure comprised of accumulated Halloysite Nanotubes. Besides, the batch and column adsorption experiments of methylene blue (MB) were applied to evaluate its adsorption performance. In batch adsorption, the influences of pH, contact time and temperature on its adsorption capacity were investigated. The adsorption kinetic and isotherm models were established, and the maximum adsorption capacity of about 250 mg/g at 308 K can be deduced from the model. After 10 successive adsorption–desorption cycles, the removal efficiency of MB could be kept above 90%. Furthermore, the results of column experiments indicate that the removal efficiency could maintain above 90% after 1500 bed volumes of waste-water were treated. The obtained results indicated that the Alg–HNT hybrid beads could be an effective adsorbent in practical application for dye removal.
Bing Zhang - One of the best experts on this subject based on the ideXlab platform.
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potent antibacterial activity of a novel silver nanoparticle Halloysite Nanotube nanocomposite powder
Journal of Inorganic Biochemistry, 2013Co-Authors: Yatao Zhang, Bing Zhang, Haoqin Zhang, Yifeng Chen, Jindun LiuAbstract:Halloysite Nanotubes (HNTs), natural Nanotube, have been developed as a support for loading of antibacterial agents. Firstly, HNTs were modified by silane coupling agent (KH-792). And then, modified HNTs were immersed in silver nitrate solution and a complex reaction between the two amino groups of KH-792 and silver ions formed, leading to large clusters on the surface of HNTs. Finally, these silver containing clusters were converted into silver nanoparticles (Ag NPs) with about 5nm diameter by reduction process. A new antibacterial agent, Ag NPs/HNTs, was characterized by X-ray fluorescence (XRF), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM) and scanning transmission electron microscopy-energy dispersive X-ray analysis (STEM-EDX). The antibacterial test indicated that Ag NPs/HNTs showed good antibacterial performance against Gram-negative bacteria (Escherichia coli) and Gram-positive bacteria (Staphylococcus aureus).
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Halloysite Nanotube fe3o4 composite for removal of methyl violet from aqueous solutions
Desalination, 2012Co-Authors: Jingmin Duan, Ruichao Liu, Tong Chen, Bing Zhang, Jindun LiuAbstract:Abstract The magnetic composite of Fe3O4-Halloysite Nanotube (HNT) was prepared by chemical precipitation method. The prepared adsorbents were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), vibrating sample magnetometer (VSM), and multipoint Brunauer–Emmett–Teller (MBET). The results revealed that Fe3O4 particles with diameter of 3–5 nm dispersed on the Nanotube surface and formed a composite with Halloysite. The Fe3O4–HNTs composite exhibited fine magnetic property (Ms = 8.47 emu/g) and could be easily separated from aqueous solution by the application of an external magnetic field. Adsorption results showed that Fe3O4–HNTs composite could maintain a high adsorption capacity for methyl violet (MV) when the pH, concentration of metal ion and temperature varied. Adsorption kinetics was best described by the pseudo-second-order model. Equilibrium data fitted well with the Langmuir isotherm. The used Fe3O4–HNTs could be regenerated by simple calcinations. The recovered adsorbents could be used again for MV removal and magnetic separation. Because of the excellent adsorption capacity at different conditions, reproducibility and separability, Fe3O4–HNTs composite is a promising candidate for removing cationic dye from waste water.
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preparation and thermal energy properties of paraffin Halloysite Nanotube composite as form stable phase change material
Solar Energy, 2012Co-Authors: Jiangshan Zhang, Yazhen Wan, Dandan Mei, Xiang Zhang, Bing ZhangAbstract:Abstract Phase change materials (PCMs) have attracted extensively interests in solar storage. In the study, we prepared a new kind of composite PCM by impregnating paraffin (P) into Halloysite Nanotube. The as-prepared composite PCM was characterized by TEM, FT-IR and DSC analysis techniques. The composite can absorb paraffin as high as 65 wt.% and maintain its original shape perfectly without any paraffin leakage after subjected to 50 melt–freeze cycles. The melting temperature and latent heat of composite (P/HNT: 65/35 wt.%) were determined as 57.16 °C and 106.54 J/g by DSC. Graphite was added into the P/HNT composite to improve thermal storage performance, and the melting time and freezing time of the composite were reduced by 60.78% and 71.52% compared with the composite without graphite, respectively. Due to its high adsorption capacity, high heat storage capacity, good thermal stability and simple preparation method, the composite can be considered as cost-effective latent heat storage material for practical application.
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the removal of dye from aqueous solution using alginate Halloysite Nanotube beads
Chemical Engineering Journal, 2012Co-Authors: Lin Liu, Bing Zhang, Yazhen Wan, Yinde Xie, Rui Zhai, Jindun LiuAbstract:Abstract The Halloysite Nanotube (HNT) has already been extensively investigated to remove various organic pollutants and metal ions, and how to prepare the beads with excellent absorbability, stability, and reusability is critical to its practical application. In this study, we prepared a new kind of porous beads by immobilizing Halloysite Nanotubes with alginate (Alg). The as-prepared product was characterized by scanning electron microscope (SEM). The SEM image shows that hybrid bead is a porous structure comprised of accumulated Halloysite Nanotubes. Besides, the batch and column adsorption experiments of methylene blue (MB) were applied to evaluate its adsorption performance. In batch adsorption, the influences of pH, contact time and temperature on its adsorption capacity were investigated. The adsorption kinetic and isotherm models were established, and the maximum adsorption capacity of about 250 mg/g at 308 K can be deduced from the model. After 10 successive adsorption–desorption cycles, the removal efficiency of MB could be kept above 90%. Furthermore, the results of column experiments indicate that the removal efficiency could maintain above 90% after 1500 bed volumes of waste-water were treated. The obtained results indicated that the Alg–HNT hybrid beads could be an effective adsorbent in practical application for dye removal.
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preparation of capric acid Halloysite Nanotube composite as form stable phase change material for thermal energy storage
Solar Energy Materials and Solar Cells, 2011Co-Authors: Dandan Mei, Ruichao Liu, Yatao Zhang, Bing Zhang, Jindun LiuAbstract:Abstract A novel form-stable composite as phase change material (PCM) for thermal energy storage was prepared by absorbing capric acid (CA) into Halloysite Nanotube (HNT). The composite PCM was characterized by TEM, FT-IR and DSC analysis techniques. The composite can contain capric acid as high as 60 wt% and maintain its original shape perfectly without any CA leakage after subjected to 50 melt-freeze cycles. The melting temperature and latent heat of composite (CA/HNT: 60/40 wt%) were determined as 29.34 °C and 75.52 J/g by DSC. Graphite (G) was added into the composite to improve thermal storage performance and the thermal storage and release rates were increased by 1.8 times and 1.7 times compared with the composite without graphite, respectively. Due to its high adsorption capacity of CA, high heat storage capacity, good thermal stability, low cost and simple preparation method, the composite can be considered as cost-effective latent heat storage material for practical applications such as solar energy storage, building energy conservation and agricultural greenhouse in the near future.
Yu Dong - One of the best experts on this subject based on the ideXlab platform.
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data for water and gas barrier properties of poly vinyl alcohol pva starch st glycerol gl Halloysite Nanotube hnt bionanocomposite films experimental characterisation and modelling approach
Composites Part B-engineering, 2019Co-Authors: Zainab Waheed Abdullah, Yu Dong, Ning Han, Shaomin LiuAbstract:Abstract In this study, ecofriendly polyvinyl alcohol (PVA)/starch (ST)/glycerol (GL)/Halloysite Nanotube (HNT) bionanocomposite at HNT contents of 0.25, 0.5, 1, 3 and 5 wt% were prepared in a solution casting process. Barrier properties against water vapour and gases of such bionanocomposite films were detected to consistently improve with increasing the HNT content when compared with those of PVA/ST/GL blends owing to tortuous paths generated at different HNT dispersion levels. Water vapour permeabilities of such blends and corresponding bionanocomposites increased in a linear manner when the temperature and relative humidity gradient increased from 25 to 55 °C and 10%-70%, respectively. Nonetheless, such permeabilities of bionanocomposites appeared to be less dependent of temperature and relative humidity gradient with increasing the HNT content. An accurate measurement of HNT aspect ratios with the aid of atomic force microscopy (AFM) yielded better agreement between experimental data and Nielsen model with respect to relative permeability of bionanocomposites. Overall, our fabricated bionanocomposites demonstrated good water and gas barrier properties to prolong the shelf life of avocados and peaches with great potential of being used as effective food packaging materials.
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biodegradable and water resistant poly vinyl alcohol pva starch st glycerol gl Halloysite Nanotube hnt nanocomposite films for sustainable food packaging
Frontiers in Materials, 2019Co-Authors: Zainab Waheed Abdullah, Yu DongAbstract:As a novel biodegradable material, poly (vinyl) alcohol (PVA)/starch (ST)/ glycerol (GL)/ Halloysite Nanotube (HNT) nanocomposite films were prepared by solution casting at the HNT contents of 0.25, 0.5, 1, 3 and 5 wt%. Water absorption capacity and water solubility of nanocomposite films were decreased remarkably by 44.24 and 48.05%, respectively, with increasing the HNT content from 0 to 5 wt% when compared with those of biopolymer matrices. Moreover, the water contact angle of nanocomposite films increased by 21.36o with the incorporation of HNTs. The presence of HNTs appeared to reduce the overall migration rates for PVA/ST/GL/HNT nanocomposite films when interacting with either hydrophilic or lipophilic food simulants. However, the migration rates of HNTs alone were enhanced with increasing the HNT contents in hydrophilic, lipophilic and acidic food simulants. On the other hand, the biodegradation rate and light transmittance of nanocomposite films were reduced linearly by 18.56 and 26.90% with increasing the HNT content from 0 to 5 wt%. Overall, novel PVA/ST/GL/HNT nanocomposite films in this study offer highly competitive material with excellent water resistance, good biodegradability and acceptable transparency to be potentially used for sustainable food packaging particularly targeting lipophilic and acidic foodstuffs.
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polylactic acid pla Halloysite Nanotube hnt composite mats influence of hnt content and modification
Composites Part A-applied Science and Manufacturing, 2015Co-Authors: Yu Dong, Jordan Marshall, Hazim J Haroosh, Soheila Mohammadzadehmoghadam, Dongyan Liu, Kintak LauAbstract:Abstract Polylactic acid (PLA)/Halloysite Nanotube (HNT) composite mats were successfully fabricated via electrospinning. Composite mats reinforced by both unmodified and modified HNTs with a dispersant BYK-9076 were prepared at the HNT contents of 0, 1, 5 and 10 wt%/v. The influence of HNT content and modification was investigated comprehensively, based on several characterisation techniques such as scanning electron microscopy (SEM), X-ray diffraction (XRD) analysis, mechanical testing, differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and Fourier transform infrared spectroscopy (FTIR). Typical modified Halpin–Tsai model and modified Halpin–Tsai laminate hybrid model in conventional composite theory were used, which were found difficult to predict the entire experimental data of elastic moduli for PLA/HNT composite mats, possibly arising from the nanosized effect of HNTs and some electrospun PLA nanofibres within composite mats.
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multi response analysis in the material characterisation of electrospun poly lactic acid Halloysite Nanotube composite fibres based on taguchi design of experiments fibre diameter non intercalation and nucleation effects
Applied Physics A, 2013Co-Authors: Yu Dong, Hazim J Haroosh, Kintak Lau, Thomas Bickford, Hitoshi TakagiAbstract:Poly (lactic acid) (PLA)/Halloysite Nanotube (HNT) composite fibres were prepared by using a simple and versatile electrospinning technique. The systematic approach via Taguchi design of experiments (DoE) was implemented to investigate factorial effects of applied voltage, feed rate of solution, collector distance and HNT concentration on the fibre diameter, HNT non-intercalation and nucleation effects. The HNT intercalation level, composite fibre morphology, their associated fibre diameter and thermal properties were evaluated by means of X-ray diffraction (XRD) analysis, scanning electron microscopy (SEM), imaging analysis and differential scanning calorimetry (DSC), respectively. HNT non-intercalation phenomenon appears to be manifested as reflected by the minimal shift of XRD peaks for all electrospun PLA/HNT composite fibres. The smaller-fibre-diameter characteristic was found to be sequentially associated with the feed rate of solution, collector distance and applied voltage. The glass transition temperature (T g) and melting temperature (T m) are not highly affected by varying the material and electrospinning parameters. However, as the indicator of the nucleation effect, the crystallisation temperature (T c) of PLA/HNT composite fibres is predominantly impacted by HNT concentration and applied voltage. It is evident that HNT’s nucleating agent role is confirmed when embedded with HNTs to accelerate the cold crystallisation of composite fibres. Taguchi DoE method has been found to be an effective approach to statistically optimise critical parameters used in electrospinning in order to effectively tailor the resulting physical features and thermal properties of PLA/HNT composite fibres.
Dandan Mei - One of the best experts on this subject based on the ideXlab platform.
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preparation and thermal energy properties of paraffin Halloysite Nanotube composite as form stable phase change material
Solar Energy, 2012Co-Authors: Jiangshan Zhang, Yazhen Wan, Dandan Mei, Xiang Zhang, Bing ZhangAbstract:Abstract Phase change materials (PCMs) have attracted extensively interests in solar storage. In the study, we prepared a new kind of composite PCM by impregnating paraffin (P) into Halloysite Nanotube. The as-prepared composite PCM was characterized by TEM, FT-IR and DSC analysis techniques. The composite can absorb paraffin as high as 65 wt.% and maintain its original shape perfectly without any paraffin leakage after subjected to 50 melt–freeze cycles. The melting temperature and latent heat of composite (P/HNT: 65/35 wt.%) were determined as 57.16 °C and 106.54 J/g by DSC. Graphite was added into the P/HNT composite to improve thermal storage performance, and the melting time and freezing time of the composite were reduced by 60.78% and 71.52% compared with the composite without graphite, respectively. Due to its high adsorption capacity, high heat storage capacity, good thermal stability and simple preparation method, the composite can be considered as cost-effective latent heat storage material for practical application.
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preparation of capric acid Halloysite Nanotube composite as form stable phase change material for thermal energy storage
Solar Energy Materials and Solar Cells, 2011Co-Authors: Dandan Mei, Ruichao Liu, Yatao Zhang, Bing Zhang, Jindun LiuAbstract:Abstract A novel form-stable composite as phase change material (PCM) for thermal energy storage was prepared by absorbing capric acid (CA) into Halloysite Nanotube (HNT). The composite PCM was characterized by TEM, FT-IR and DSC analysis techniques. The composite can contain capric acid as high as 60 wt% and maintain its original shape perfectly without any CA leakage after subjected to 50 melt-freeze cycles. The melting temperature and latent heat of composite (CA/HNT: 60/40 wt%) were determined as 29.34 °C and 75.52 J/g by DSC. Graphite (G) was added into the composite to improve thermal storage performance and the thermal storage and release rates were increased by 1.8 times and 1.7 times compared with the composite without graphite, respectively. Due to its high adsorption capacity of CA, high heat storage capacity, good thermal stability, low cost and simple preparation method, the composite can be considered as cost-effective latent heat storage material for practical applications such as solar energy storage, building energy conservation and agricultural greenhouse in the near future.
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preparation of stearic acid Halloysite Nanotube composite as form stable pcm for thermal energy storage
International Journal of Energy Research, 2011Co-Authors: Dandan Mei, Bing Zhang, Ruichao Liu, Haoqin Zhang, Jindun LiuAbstract:A novel form-stable composite as phase change material (PCM) for thermal energy storage was prepared by absorbing stearic acid (SA) into Halloysite Nanotube (HNT). The composite PCM was characterized by TEM, FT-IR and DSC analysis techniques. The composite can contain SA as high as 60 wt% and maintain its original shape perfectly without any SA leakage after subjected to 50 melt–freeze cycles. The melting temperature and latent heat of composite (SA/HNT: 60/40 wt%) were determined as 53.46°C and 93.97 J g−1 by DSC. Graphite was added into the SA/HNT composite to improve thermal storage performance, and the melting time and freezing time of the composite were reduced by 65.3 and 63.9%, respectively. Because of its high adsorption capacity of SA, high heat storage capacity, good thermal stability, low cost and simple preparation method, the composite can be considered as cost-effective latent heat storage material for practical application. Copyright © 2011 John Wiley & Sons, Ltd.
Ruichao Liu - One of the best experts on this subject based on the ideXlab platform.
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Halloysite Nanotube fe3o4 composite for removal of methyl violet from aqueous solutions
Desalination, 2012Co-Authors: Jingmin Duan, Ruichao Liu, Tong Chen, Bing Zhang, Jindun LiuAbstract:Abstract The magnetic composite of Fe3O4-Halloysite Nanotube (HNT) was prepared by chemical precipitation method. The prepared adsorbents were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), vibrating sample magnetometer (VSM), and multipoint Brunauer–Emmett–Teller (MBET). The results revealed that Fe3O4 particles with diameter of 3–5 nm dispersed on the Nanotube surface and formed a composite with Halloysite. The Fe3O4–HNTs composite exhibited fine magnetic property (Ms = 8.47 emu/g) and could be easily separated from aqueous solution by the application of an external magnetic field. Adsorption results showed that Fe3O4–HNTs composite could maintain a high adsorption capacity for methyl violet (MV) when the pH, concentration of metal ion and temperature varied. Adsorption kinetics was best described by the pseudo-second-order model. Equilibrium data fitted well with the Langmuir isotherm. The used Fe3O4–HNTs could be regenerated by simple calcinations. The recovered adsorbents could be used again for MV removal and magnetic separation. Because of the excellent adsorption capacity at different conditions, reproducibility and separability, Fe3O4–HNTs composite is a promising candidate for removing cationic dye from waste water.
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preparation of capric acid Halloysite Nanotube composite as form stable phase change material for thermal energy storage
Solar Energy Materials and Solar Cells, 2011Co-Authors: Dandan Mei, Ruichao Liu, Yatao Zhang, Bing Zhang, Jindun LiuAbstract:Abstract A novel form-stable composite as phase change material (PCM) for thermal energy storage was prepared by absorbing capric acid (CA) into Halloysite Nanotube (HNT). The composite PCM was characterized by TEM, FT-IR and DSC analysis techniques. The composite can contain capric acid as high as 60 wt% and maintain its original shape perfectly without any CA leakage after subjected to 50 melt-freeze cycles. The melting temperature and latent heat of composite (CA/HNT: 60/40 wt%) were determined as 29.34 °C and 75.52 J/g by DSC. Graphite (G) was added into the composite to improve thermal storage performance and the thermal storage and release rates were increased by 1.8 times and 1.7 times compared with the composite without graphite, respectively. Due to its high adsorption capacity of CA, high heat storage capacity, good thermal stability, low cost and simple preparation method, the composite can be considered as cost-effective latent heat storage material for practical applications such as solar energy storage, building energy conservation and agricultural greenhouse in the near future.
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preparation of stearic acid Halloysite Nanotube composite as form stable pcm for thermal energy storage
International Journal of Energy Research, 2011Co-Authors: Dandan Mei, Bing Zhang, Ruichao Liu, Haoqin Zhang, Jindun LiuAbstract:A novel form-stable composite as phase change material (PCM) for thermal energy storage was prepared by absorbing stearic acid (SA) into Halloysite Nanotube (HNT). The composite PCM was characterized by TEM, FT-IR and DSC analysis techniques. The composite can contain SA as high as 60 wt% and maintain its original shape perfectly without any SA leakage after subjected to 50 melt–freeze cycles. The melting temperature and latent heat of composite (SA/HNT: 60/40 wt%) were determined as 53.46°C and 93.97 J g−1 by DSC. Graphite was added into the SA/HNT composite to improve thermal storage performance, and the melting time and freezing time of the composite were reduced by 65.3 and 63.9%, respectively. Because of its high adsorption capacity of SA, high heat storage capacity, good thermal stability, low cost and simple preparation method, the composite can be considered as cost-effective latent heat storage material for practical application. Copyright © 2011 John Wiley & Sons, Ltd.
