CONSTRUCTION AND BUILDING MATERIALS
·
2022
·
IF 7.693
Xing Cao,Ruiqi Zhang,Ning Zhang,Lei Chen,Dongming Chen,Xuebing Li
Organic phase change materials (PCMs) such as fatty acids and fatty alcohols are often trapped by inherent low thermal conductivity for thermal energy storage in buildings. The present study is devoted to ameliorating this problem from an innovative perspective of introducing bio-sourced additive. To promote performance of binary eutectic PCM comprising lauric acid (LA) and 1-hexadecanol (HD), the composite PCMs are developed, where the powdered seashell waste is added as thermal enhancer, and their thermo-physical properties are characterized via DSC, FT-IR, SEM, TGA, cooling curve analysis, accelerated thermal cycling test together with thermal conductivity measurement. Meanwhile, the impacts of two particle sizes, five mixing ratios between two different sizes and two modification approaches of seashell powder (SP) are surveyed meticulously. Experimental results turn out that 80-mesh SP and 300-mesh SP are both capable of providing greater thermal conductivity when dispersed in LA-HD eutectic PCM, and the enhancement level of thermal conduction is even higher for composite PCM containing 300-mesh SP than for composite PCM containing TiO 2 powder. Besides, the thermal conduction ability is strengthened to the maximum extent when 80-mesh SP and 300-mesh SP are combined at mass ratio of 3:7, while the same situation also occurs when seashell powder is treated by high-temperature calcination. The resultant composite PCM possesses encouraging melting temperature and melting enthalpy, and its thermal stability and reliability are well approved. Therefore, we conclude that the seashell powder has the expectable competence to realize performance improvement of organic PCM for application in buildings for thermal energy storage.
研究领域:
建筑材料
·
能源储存
·
可持续发展
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2018
·Vol. 10
·期 5
·498
·
IF 2.935
Wanyong Yu,Na Han,Yongqiang Qian,Xingxiang Zhang,Wei Li
Cellulose was premodified by short-chain fatty acid anhydrides, such as acetic anhydride (CA), propionic anhydride (CP), and butyric anhydride (CB), followed by grafting of polyoxyethylene (2) hexadecyl ether (E2C16) using toluene-2,4-diisocyanate as a coupling agent. The feeding molar ratio of E2C16and the anhydroglucose unit (AGU) was fixed at 4:1, and then a series of CA-g-E2C16, CP-g-E2C16, and CB-g-E2C16copolymers were successfully prepared. The structures and properties of the copolymers were characterized using FTIR (fourier transform infrared spectra),1H-NMR (Proton nuclear magnetic resonance), DSC (Differential scanning calorimeter), POM (polarized light microscopy), TGA (thermogravimetric analysis) and WAXD (wide-angle X-ray diffraction). It was shown that with the anhydride/AGU ratio increasing, the degree of substitution (DS) value of E2C16showed a trend of up first and then down. With the carbon chain length increasing, the DS value of E2C16continuously increases. The phase transition temperature and thermal enthalpy of the copolymers increased with an increasing DS value of E2C16. When the ratio of CB/AGU was 1.5:1, the DS of E2C16was up to the maximum value of 1.02, and the corresponding melting enthalpy and crystallization enthalpy were 32 J/g and 30 J/g, respectively. The copolymers showed solid–solid phase change behavior. The heat resistant temperature of cellulose-based solid–solid phase change materials was always higher than 270 °C. After the grafting reaction, the crystallinity of E2C16decreased, while the crystal type was still hexagonal.Keywords:cellulose;fatty acid anhydride;polyoxyethylene (2) hexadecyl ether;solid–solid phase change
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2022
·
IF 9.463
Lei Chen,Ruiqi Zhang,Xing Cao,Xuebing Li,Yongtao Qu
High latent heat and thermostatic properties of phase change materials (PCMs) have made them the promising materials. Herein, a novel thermally-induced flexible 1-Hexadecanol/Olefin block copolymer/Hexagonal boron nitride (HD/OBC/h-BN) composite phase change material (CPCM) is proposed. Bio-based non-polluting material of HD is employed innovatively as the phase change component. The triggering of HD phase transition can achieve various deformation modes for CPCM, which is beneficial to reduce the thermal contact resistance between CPCM and device. The electrically insulating property of h-BN not only improves the thermal conductivity and the heating/cooling rate of CPCM, but also further solves the problem of the HD leakage (as low as 0.31 wt%). The prepared CPCM with excellent flexibility and high latent heat (above 150 J/g) has good thermal stability and thermal reliability in the working temperature range. This provides developed CPCM greater potential for thermal energy storage (TES) and thermal management (TM) than conventional PCMs.
研究领域:
材料科学
·
热能工程
✓ 已验证
产品关联
DOI
高影响因子
FIBERS AND POLYMERS
·
2020
·Vol. 21
·期 9
·1956-1964
·
IF 1.797
Zhou Meihui,Luo Yan,Du Juan
Higher coating rate and larger enthalpy value of phase change materials (PCMs) are the key content of temperature-regulated textile. The warming impact of traditional temperature-regulated textiles, namely no microencapsulated phase change materials (MPCMs) loading, is impermanent. In this paper, a high-efficiency heat storage and thermo-regulated MPCMs based on butyl stearate (BS)/hexadecanol (HD) binary system was synthesized successfully. It is found that the MPCMs take on spherical shape, as well as relatively uniform particle size. The mean particle size of MPCMs with smooth and compact surface is 1.755 um. Moreover, the phase change temperature of the MPCMs varied from 21.06 °C to 27.33 °C, and the latent heat of MPCMs was up to 73.78 J/g. A new type of intelligent textile material, namely temperature-regulated seaweed fibers were obtained by using wet spinning process adopting the resulted MPCMs. As a result, the MPCMs endows the seaweed fibers good temperature-regulated property.
研究领域:
纺织科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 67
·42129-42137
·
IF 3.108
Bozhen Wu,Liming Shi,Qi Zhang,Wen-Jun Wang
Herein, a novel approach for generating a microencapsulated reversible thermochromic phase change material (RTPCM) is described. The system described uses a spirolactone derivative color former, phenolic hydroxyl compound color developer, and 1-hexadecanol as the phase change material and co-solvent. The microencapsulation is achieved by complex coacervation of modified gelatin containing vinyl groups and gum arabic. This is followed by the crosslinking reaction between vinyl groups on modified gelatin and a divinyl crosslinker and subsequent crosslinking reaction with glutaraldehyde to improve stability and encapsulation efficiency. The influence of various key parameters on properties of the microcapsules (encapsulation efficiency, morphology, and particle size) are reviewed including the substitution degree of vinyl groups on modified gelatin, the type and amount of divinyl crosslinkers, and the core/shell ratio. Thermal properties and reversible color reliability of the generated microcapsules were found to be stable after 100 thermal heating and cooling cycles. Such microcapsules are well suited for latent heat storage and as an indicator for the states of energy saturation and consumption in phase change material applications directly through color change.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Reaction Kinetics Mechanisms and Catalysis
·
2022
·Vol. 135
·期 3
·1621-1634
·
IF 1.843
Gu Xiaoyu,Shi Haonan,Wang Dandan,Chen Jixiang
The carbon-coated Ni (Ni@C) and Ni–In intermetallic compounds (IMCs) (Ni–In@C) catalysts were synthesized via combining one-pot hydrothermal method with glucose as carbon source and the carbonization under N 2 atmosphere. Their reactivities were compared in in situ aqueous phase selective hydrogenation of methyl palmitate to hexadecanol using methanol as a H 2 donor. The Ni@C catalyst dominatingly catalyzes decarbonylation/decarboxylation, accompanying with the serious C–C bond hydrogenolysis and methanation. In contrast, hexadecanol is mainly generated on Ni–In@C, where C–C bond hydrogenolysis and methanation are remarkably inhibited. This is ascribed to the geometric and electronic property of Ni–In IMCs. The hexadecanol yield reaches 84.0% under an optimal condition on Ni–In@C. The structure of NiIn IMC is hydrothermally stable even at 330 °C, and the Ni–In IMCs particles highly resist to sintering and leaching under harsh hydrothermal condition due to the confinement of carbon. Catalyst deactivation is mainly due to the carbonaceous deposition, and the catalyst reactivity is mostly recovered by the regeneration with CO 2 .
研究领域:
催化化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Energy Technology
·
2017
·Vol. 5
·期 11
·2005-2014
·
IF 2.789
Yi Wang,Zhou Liu,Ting Zhang,Zhengfei Zhang
With the aim of improving the shape stability and recycling reliability of hexadecanol (HD), graphene oxide (GO)-grafted hexadecanol (GO- g -HD) shape-stabilized phase-change material (SSPCM) with good thermochemical properties was prepared by oxidizing graphite powders to form GO, which was converted into the acyl chloride and finally condensed with HD. Various characterization techniques were employed to investigate the microstructure, thermal properties, thermal durability, and reliability of the composite. The results show that HD was embedded in the composite with a maximum mass fraction of 62.7 wt % through physical adsorption and covalent bonding. The grafted percentage and density of HD on ultrathin GO sheets are 36.5 wt % and 1.51 mmol g −1 , respectively. The GO- g -HD SSPCM melts at 49.7 °C with a latent heat of 152.3 J g −1 , and freezes at 45.4 °C with a phase-change enthalpy of 129.9 J g −1 . The thermal conductivity of GO- g -HD is measured as 0.519 W m −1 K −1 , which is an improvement of 41.8 % compared with that of neat HD. Moreover, the as-prepared composite also presents excellent chemical and thermal stability, excellent thermal durability, negligible variation in latent heats, and no changes in the phase-change temperatures due to strong covalent bonds and interactions between the matrix and HD. Thus, GO- g -HD is a promising candidate for thermal energy storage in the future because of the very good latent heat, enhanced conductivity, and stability.
研究领域:
材料科学
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热能工程
·
能量存储
✓ 已验证
产品关联
DOI
高影响因子
TEXTILE RESEARCH JOURNAL
·
2018
·
IF 1.54
Na Han,Wenxin Zhang,Xiufang Wang,Xingxiang Zhang,Wei Li,Wanyong Yu
It is a worldwide challenge to efficiently use renewable resources to solve the current energy shortage. The existing cellulose-based material is incapable of proper power storage. In this study, a series of cellulose benzoate-g-polyoxyethylene (2) hexadecyl ether (CB-g-E2C16) solid–solid phase change materials were synthesized with cellulose as the skeleton and polyoxyethylene (2) hexadecyl ether (E2C16) as a functional side chain. The skeleton cellulose and benzoyl chloride restrict the free movement of the molecular chains of E2C16 above the phase transition temperature, leading to a solid–solid phase change. Fourier transform infrared spectroscopy and nuclear magnetic resonance spectroscopy were performed to investigate the chemical structures. The thermal energy-storage properties, thermal reliability and thermal stability of the CB-g-E2C16 were investigated by differential scanning calorimetry and thermogravimetry (TG) methods. The analysis results indicated that the E2C16 chains were successfully grafted onto the cellulose benzoate (CB) backbone and the copolymers exhibited typical solid–solid phase transition behavior. The enthalpy and degree of substitution of graft copolymers CB-g-E2C16 could be adjusted by changing the feeding ratio of the raw materials, reaction temperature and post-processing methods of CB. TG analysis results showed that the CB-g-E2C16 copolymers possessed good thermostability and they keep their stability up to 278℃. Compared with pure cellulose, CB-g-E2C16 copolymers could be dissolved in dimethyl sulfoxide and most of them could be dissolved in N,N-dimethylformamide.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2024
·
IF 6.3
Tao Xu,Runhua He,Gan Fan,Dongqiao Zhang,Jiaming Zhang,Yanliang Du,Wei Zhou,Jing Yang
High temperature will generate when photovoltaic (PV) panel works, which probably reduces circle life and conversion efficiency during working. Typical phase change materials (paraffin, non-paraffin organics or salt hydrates) are restricted due to low thermal conductivity and incongruent melting and super-cooling. Herein, hexadecanol-palmitic acid/expanded graphite (HA-PA/EG) eutectic composite phase change materials with excellent thermal conductivity , leakage property, thermal stability and cycling stability were successfully prepared. The phase change temperature and latent heat of corresponding HA-PA/EG are 43.2 °C and 182.3 kJ/kg, respectively. HA-PA/EG possessed excellent thermal stability, and can meet the temperature requirement of photovoltaic panel during running. Furthermore, HA-PA/EG PCM had stable phase change temperature and latent heat even after 100 cycle heating. When applied in photovoltaic panel, HA-PA/EG could absorb large amount of heat from solar radiation and photovoltaic panel during strong solar radiation. When the solar radiation intensity was 815.9 W/m 2 , the temperature of HA-PA/EG-modified photovoltaic panel was 5.1 °C lower than that of control, and the temperature control by HA-PA/EG had excellent stability in different position. Thanks to the huge heat absorption by HA-PA/EG, the output voltage and power of photovoltaic panel could be considerably improved to 5.7 % and 7.4 % higher than that of control at the solar radiation intensity as 815.9 W/m 2 . Our result demonstrates that HA-PA/EG PCM is promising in the heat management of PV . Our study provides a novel eutectic PCM with suitable phase change temperature and excellent thermal conductivity to control the temperature and improve the corresponding voltage and power performance of PV panel.
研究领域:
材料科学
·
能源工程
·
光伏技术
✓ 已验证
DOI
高影响因子
Polymers
·
2021
·Vol. 14
·期 1
·53
·
IF 4.329
Weipei Li,Liqing Xu,Xiangqin Wang,Ruitian Zhu,Yurong Yan
A novel thermoplastic polyurethane (TPU) PCFs possessing a high loaded ratio and high elasticity was simply prepared by vacuum absorption following wet spinning, then coated by waterborne polyurethane (WPU). Octadecane (OCC), hexadecanol (HEO), and stearic acid (SA), which have different tendencies to form hydrogen bonds with TPU, were selected as PCMs, and their thermal behavior, thermal storge properties, and elasticity were systematically studied, respectively. The hierarchical pore structure though from the sheath to the core part of TPU filaments weakened the influence of the nonfreezing layer and hydrogen bond on the crystallization behavior of PCMs. The resulting HEO/TPU fiber has the highest enthalpy of 208.1 J/g compared with OCC and SA. Moreover, the HEO/TPU fiber has an elongation at break of 354.8% when the phase change enthalpy is as high as 177.8 J/g and the phase change enthalpy is still 174.5 J/g after fifty cycles. After ten tensile recovery cycles, the elastic recovery rate of HEO/TPU fiber was only 71.3%. When the HEO in the fiber was liquid state, the elastic recovery rate of HEO/TPU fiber promoted to 91.6%. This elastic PCFs have excellent thermal cycle stability, elastic recovery, and temperature sensitivity. It has great application potential in the fields of flexible wearable devices, intelligent fabrics, and temperature sensors.Keywords:porous structure fiber;hydrogen bond;elastic;phase change materials
研究领域:
材料科学
·
热能工程
·
纺织科学
·
高分子科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Ling Zhou,Xue-feng Tao,Li-sheng Tang,Ming-Bo Yang,Wei Yang
The incorporation of porous supporting materials to prepare shape-stable phase change materials (PCMs) is of great interest in recent years. However, extensive reported composite PCMs are shape-stable in the air atmosphere but neglected in the water environment. To develop shape-stable and waterproof PCMs is important for their outdoor applications but challenging. Herein, we report a novel cellulose nanocrystal/poly(N-isopropylacrylamide) (CNC/PNIPAM) gel-supported hexadecanol (H-anol) PCM with good thermal storage properties and excellent shape stability in both air and water environments. The CNC/PNIPAM hydrogel is prepared through an ultraviolet-induced C═C cross-linking reaction, and its physical structure and mechanical properties are well characterized. H-anol is then directly immerged into the CNC/PNIPAM alcogel by a facile and low-cost solvent-exchange strategy. The mechanism of the solvent-exchange strategy has been established. Because of the temperature-sensitive hydrophilic/hydrophobic transform behavior of the CNC/PNIPAM network, the CNC/PNIPAM/H-anol PCM displays excellent shape stability in a water environment by forming a dense hydrophobic surface, providing it with great potential in all-weather thermal energy storage applications.
研究领域:
材料科学
·
能量存储
·
复合材料
·
高分子化学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LANGMUIR
·
2021
·
IF 3.882
Nianrong Feng,Jun Deng,Genhui Teng,Dongying Hu
The development of high-performance shape-stable phase change material composites (SPCMs) with high phase change enthalpy and high conversion efficiency, especially with good photochromic properties, is essential for thermal energy storage. Here, we report that one type of SPCMs with both photochromic and phase change energy storage is obtained by incorporating organic binary composite PCMs (hexadecanol/coconut oil, H/C) and photochromic phosphotungstic acid (PA) into Ochroma pyramidale wood-based cellulose microframe (DOW) through simple vacuum impregnation. When the ratio of hexadecanol to coconut oil is 3:7 and the ratio of phosphotungstic acid to N,N-dimethylacetamide is 4:13.6, the SPCM composite material (DOW-H3C7-4PA) represents a high phase transition enthalpy of 163.7 J/g and an appropriate phase transition temperature of 42.55 °C that can be applied to the environmental temperature adjustment of high-temperature areas (>40 °C) mentioned in this paper, in addition to the excellent thermal stability and photochromic stability; for example, even after 100 thermal cycles and UV radiation cycles, its phase transition enthalpy remains almost unchanged. The DOW-H3C7-4PA composite material also shows good shape stability and leakage resistance. In addition, the high photothermal conversion efficiency (65.71%) of DOW-H3C7-4PA is considered to be a promising candidate for photothermal energy storage applications. Therefore, the manufactured SPCMs (DOW-H3C7-4PA) have high latent heat, good melting/freezing cycle reliability, high photochromic stability, and remarkable light-to-heat energy conversion ability, making them show broad application prospects in energy conversion and storage devices.
研究领域:
材料科学
·
储能技术
·
化学工程
·
可持续技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）