RSC Advances
·
2017
·Vol. 7
·期 19
·11244-11252
·
IF 3.108
Hongwei Cao,Feixuanyu Qi,Ruowang Liu,Fengtao Wang,Caixia Zhang,Xiaoni Zhang,Yuye Chai,Lanlan Zhai
Hydrogen bonding was used to enhance the crystallinity and thus increase the phase change enthalpy of thermoplastic poly(ethylene glycol)-based polyurethane. With novel hydrogen bonding between two hard segments (NH⋯N) in N-methyldiethanolamine-extended polyurethane (NPU), the intensity of the NH⋯OC hydrogen bond between two hard segments increased, while that of the NH⋯O hydrogen bond between soft and hard segments decreased. The crystallinity and energy storage capability of NPU benefited from these and was thus enhanced. The phase change enthalpy was approximately 140 J g−1, which is very close to the highest value reported for cross-linked polyurethane. In addition, the crystallinity and crystallite perfection of NPU increased with the regular arrangement of soft segments and the microphase separation between soft and hard domains. The influence of the three different hydrogen bonds on the phase change enthalpy, crystallinity, crystallization morphology and microphase structure of the soft segment was discussed.
研究领域:
材料科学
·
能源存储
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产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 101
·99361-99366
·
IF 3.289
Lan Lei,Lin Feng,Binglei Song,Zhaolan Zhai,Shibin Shang,Zhanqian Song
Modification of the molecular structures of surfactants is a feasible way to construct ionic liquid crystals (ILCs) with novel properties. Five quaternary ammonium gemini surfactants with different spacers, whose head groups were substituted by four hydroxyethyl groups, abbreviated as 12(2OH)-s-12-(2OH) (s = 3, 4, 5, 6, 8), were prepared. The mesomorphic behaviors of these gemini surfactants were investigated by polarized optical microscopy (POM), differential scanning calorimetry (DSC), X-ray diffraction (XRD) and temperature-dependent FT-IR spectroscopy. These surfactants form smectic A (SmA) phases, the region of which is dependent on the spacer length. The presence of suitable spacer length and multiple hydroxyl groups is helpful in stabilizing the mesophases. Noticeably, because of synergistic effect of the spacer and the hydroxyl groups, the phase enthalpy change of SmA to crystal transitions can be slowly released below the phase transition temperature. This interesting discovery, which has never been reported in ILC systems formed by small molecular weight surfactants, could pave the way for special applications of ILCs in the area of sustained-release materials of heat and could widen the application of ionic liquid crystals.
研究领域:
材料科学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2023
·
IF 6.9
Yifan Jia,Guoxing Liao,Yang Wu,Oleksandr Mykhaylyk,Paul D. Topham,Xue-Hui Dong,Changzhong Chen,Qianqian Yu,LinGe Wang
Form-stable phase change fibers (PCFs) that are composed of stable supporting material (as polymer matrix) and phase change material (PCM, as working ingredient) have become novel smart materials, being widely applied in energy storage, thermal regulation and the biomedical field . However, the inherent limitation of PCFs is the restriction of the supporting material on the crystallization of the PCM, which results in low phase change enthalpy (Δ H ). Here, six different types of PCF comprised of poly(lactic acid) (PLA, as supporting material) and poly(ethylene glycol) (PEG, as PCM) have been fabricated. Their morphology, phase change performance and structural transitions during phase change have been extensively studied. We reveal that the crystallizability and glass transition temperature of PLA have a dominating influence on Δ H . In the optimum system, PLA/PEG PCFs can achieve up to 104 J/g Δ H which is close to the theoretical value of pristine PEG. This high-performance PCF also exhibits only 2.5% Δ H loss after 100 thermal cycles and good ability in thermal energy storage and thermal regulation. This work provides a promising form-stable PCF and introduces a new strategy towards developing high Δ H PCFs by selecting suitable supporting materials.
研究领域:
材料科学
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能源存储
·
生物医学工程
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Wentao Wang,Xiaoqiao Fan,Jinjing Qiu,Malik Muhammad Umair,Benzhi Ju,Shufen Zhang,Bingtao Tang
Temperature regulation of magnetic thermotherapy used for the treatment of diseases needs to be precise and accurately controllable. Substantial efforts have been focused recently on manipulating the parameters of alternating magnetic field (AMF) and developing nanoparticles with low Curie temperatures for a desired thermotherapy temperature. Herein, a simple and effective approach for temperature control in magnetic thermotherapy through phase transition is reported. In general, extracorporeal magnetic thermotherapy materials are synthesized by introducing superparamagnetic nanoparticles in a phase change material with high phase transition enthalpy in the thermotherapy temperature range of 41 °C–47 °C. Given the magnetothermal effect of superparamagnetic nanoparticles and temperature control characteristics by phase transition of a phase change material, the temperature of the material in AMF can be self-regulated in the thermotherapy range. Moreover, the materials exhibit excellent thermal stability, form-stable properties, and outstanding reproducibility in temperature control for repeated use. This novel strategy may open a promising avenue for the study of temperature self-controlled thermotherapy.
研究领域:
医学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2023
·
IF 6.9
Chenzhen Liu,Huanxin Cao,Peng Yang,Kun Huang,Zhonghao Rao
Microencapsulation technology solves the problems that phase change materials (PCM) are easy to leak, difficult to transport, and vulnerable to contamination. However, the shell materials are mostly organic materials with low thermal conductivity , which limits their specific application in the field of thermal energy storage . In this regard, in order to enhance the thermal conductivity, a novel type of microencapsulated phase change materials (MicroEPCM) based on an n-eicosane core and a phenol-formaldehyde resin shell modified by nano-BN and nano-SiC, respectively, were fabricated via in-situ polymerization method. The effect of the mass fractions (2, 4 and 6 wt%) of nano-additives on the performance of MicroEPCM-BN and MicroEPCM-SiC was systematically investigated. The morphology, chemical structure and thermal properties of modified MicroEPCM were characterized by SEM , FTIR, XRD and DSC , respectively, to determine the optimum incorporation of nano-additives. Conclusions are as follows: modified MicroEPCM still had a spherical morphology with an average particle size range of 2–8 μm. Furthermore, the addition of nano-additives significantly improved the thermal conductivity of MicroEPCM, and the thermal conductivity gradually increased with the progressive increase in nano-additives content. MicroEPCM-4%BN and MicroEPCM-6%SiC had the best overall performance with phase change enthalpies of 145.83J/g and 131.30J/g, respectively, and the thermal conductivity increased by 61 % and 97 %, respectively, compared to that of MicroEPCM without nano-additives. They also showed excellent thermal cycling and degradation stability. Consequently, MicroEPCM modified by nano-additives will have great potential for thermal energy storage applications.
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
高影响因子
Nano Energy
·
2022
·
IF 19.069
Piao Cheng,Zhaodi Tang,Xiao Chen,Jianhang Xu,Panpan Liu,Xiaowei Zhang,Ge Wang
With increasing global installation of photovoltaic panels and more complex functionalities of smart electronic devices, a fundamental problem in photovoltaic conversion and electronic device operation is massive heat generation, which severely reduces energy utilization efficiency and service life. Herein, we proposed a self-powered thermal management strategy integrating metal-organic framework (MOF) and liquid-gas phase change hydrogel ((Poly (vinyl alcohol)/CaCl 2 ·6H 2 O, PVA/CH), which is much beyond traditional solid-liquid phase change materials in phase change enthalpy . Benefiting from the self-adaptive capability of MOF, MOF@PVA/CH bilayer was capable of efficiently evaporating water molecules with a rate of ∼0.90 kg m −2 h −1 at higher temperature and capturing water molecules with a rate of 0.21 g g −1 from the surrounding humid air at lower temperature for self-regeneration. Specifically, this self-adaptive passive cooling strategy tremendously boosted the thermal management efficiency of the simulative heater, and reduced the surface temperature of solar cell by 18 ℃. Our proposed approach provides a promising reference for achieving high cooling efficiency, low-energy consumption, and self-powered thermal management for thermo-related devices.
研究领域:
材料科学
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能源工程
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2025
·
IF 6.3
Ruishuo Guo,Huijia Wang,Qingwen Wen,Xin Xu,Yanlan Zhou,Xiaoqiang Shao,Ni Li
Phase change capsules effectively address the limitations of leakage and poor stability of phase change materials (PCMs). In this study, SiO 2 @n-Octadecane phase change nanocapsules (PCNCs) with controllable size and structure are prepared by controlling material ratios. When Water-to-EtOH ratio is 2:1 and C 18 -to-TEOS ratio is 3:3 in the reaction system, prepared PCNCs show excellent phase change enthalpy of 152.9 J/g and high encapsulation ratio of 73.77 %, with desirable thermal stability and reliability. After the irradiation of simulating sunlight for 1500 s, the PCNCs achieved a temperature buffer of 6 °C compared with blank cotton fabric, and the cotton fabric with the PU coating containing the PCNCs presents up to 13.2 °C temperature reduction compared with original cotton fabric. The prepared SiO 2 @n-Octadecane PCNCs present excellent heat storage and thermal management performance and effective strategy to develop long-term thermal comfort smart textiles.
研究领域:
材料科学
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纳米技术
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热工工程
·
智能纺织
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LOSS PREVENTION IN THE PROCESS INDUSTRIES
·
2023
·
IF 3.5
Lei Ni,Dongyan Yang,Yinshan Liu,Chenghao Li,Qiang Chen,Juncheng Jiang,Yong Pan
Reaction thermal runaway accidents occur frequently and occupy a high proportion in chemical accidents. Reducing accidents by controlling reaction temperature is of great implication to enhance the safety level of chemical processes. Phase change materials (PCMs) have a good energy storage potential, which can rapidly convert the reaction exotherm in the reaction process into its own phase change latent heat, urgently control the reaction temperature, and enhance the process thermal safety level. In this study, using n -octadecane as the core and melamine-formaldehyde (MF) resin as the shell, microencapsulated phase change materials (microPCMs) was made, which has a smooth spherical shape, good thermal stability , and a phase change enthalpy up to 162.87 J/g. The homogeneous esterification reaction of 2-butanol (2 B) and propionic anhydride (PA) was selected as the target reaction, and then the reaction was scaled up equivalently to investigate the effect of amplification to the reaction system. The results indicated that the temperature control of the esterification reaction system by microPCMs is the synergy between physical inhibition and chemical inhibition. The reaction temperature could be controlled by adding microPCMs, and the temperature control effect improved with the increase of microPCMs addition. In large scale reactors, microPCMs still has certain temperature control ability after being added.
研究领域:
化学工程
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材料科学
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安全工程
✓ 已验证
产品关联
DOI
高影响因子
ENERGY AND BUILDINGS
·
2022
·
IF 7.201
Z.H. Kuai,Ting Yan,Y.J. Huo,Kai Wang,W.G. Pan
At present, low heat storage capacity of organic phase change materials (PCMs) becomes a common problem, and the addition of matrix can contribute to its application in practical engineering. Mixing the porous expanded graphite (EG) with Co 3 O 4 via carbonation of ZIF-67 uniformly, the composite materials PVP@Co 3 O 4 /EG were prepared by crosslinking the agent PVP (polyvinyl pyrrolidone), simultaneously the multilayer structure porous OC-PVP@Co 3 O 4 /EG composites were prepared by melt-blending method with octadecanol (OC). The thermophysical properties of the composite PCMs appeared the difference by adjusting the ratio of OC to Co 3 O 4 . The micromorphology, phase transition enthalpy and phase transition temperature of composite PCMs were determined by scanning electron microscope (SEM) and differential scanning calorimeter (DSC). The multilayer structure prepared by Co 3 O 4 and EG is conducive to the effective transmission of phonons around the axial point, and achieves the goal of efficient heat transfer between PCMs and the external environment. The obtained OC-PVP@Co 3 O 4 /EG (Co 3 O 4 :EG = 1:8) PCMs exhibited excellent thermal conductivity (11.4 W∙m −1 ∙K −1 ), large phase change enthalpy (187.04 kJ∙kg −1 ). The infrared imaging verified that the infrared light intensity of two thermally conductive substrates (Co 3 O 4 :EG = 1:4, 1:8) in the exothermic stage was less than the ratio of Co 3 O 4 :EG is 1:4 and 1:8, which was in accordance with the results of the charging/discharging experiments.
研究领域:
材料科学
·
热能工程
·
能量存储
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Xinquan Zou,Yaoting Song,Yi Zhang,Lu Xing,Jiani Yan,Jikui Wang
During the charging/discharging process, a large amount of heat is constantly generated inside the supercapacitor . Therefore, thermal management of supercapacitors is crucial. In this work, a calcium alginate/polyaniline/polyethylene glycol (CA/PANI/PEG) double network multifunctional aerogels were prepared for thermal energy storage and electrochemical energy storage Due to the strong hydrogen bonding between PANI and CA and ionic cross-linking between CA molecular chains , the CA/PANI double network structure can be used to solidify PEG. CA/PANI/PEG aerogels can form stable porous network structures with excellent properties. For example, due to the in-situ thermal management of CA/PANI/PEG, CA/PANI/PEG exhibits a higher specific capacitance than the traditional PANI-based electrode at 55 °C. More importantly, the CA/PANI/PEG aerogel not only possessed a high enthalpy of phase transition (162.1 J/g) but also showed superior capacitive performance (175 mF/cm 2 at 0.1 mA/cm 2 at 55 °C). After 10,000 charge/discharge cycle tests, it can maintain 84.5 % of the initial capacitance. This study opens up a new way for the development and application of PCMs in the thermal management of supercapacitors.
研究领域:
材料科学
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能源存储
·
纳米技术
·
电化学
·
热管理
✓ 已验证
产品关联
DOI
高影响因子
APPLIED ENERGY
·
2024
·
IF 10.1
Jiyan Li,Yong Long,Yanju Jing,Jiaqing Zhang,Silu Du,Rui Jiao,Hanxue Sun,Zhaoqi Zhu,Weidong Liang,An Li
The development of efficient solar photothermal conversion and energy storage composite (SPCSC) is of great significance in solving the imbalance between supply and demand of solar energy utilization in time and space. Herein, we prepare multi-shell hollow spheres by selecting glucose as the template and magnesium carbonate trihydrate (MgCO 3 ·3H 2 O) and chloroplatinic acid hexahydrate (H 2 PtCl 6 ·6H 2 O) as raw materials by hydrothermal-calcination method. Octadecylamine (ODA) is loaded into MSHS by vacuum impregnation to prepare SPCSC with excellent comprehensive properties (MSHS@ODA). The multi-layer hollow microspheres provide the micro-nano space structure for ODA, enhance the heat transfer rate of MSHS@ODA, effectively solve the leakage problem, and enable MSHS@ODA to have a fast photothermal response. MSHS@ODA possesses a high light absorption (75.5%), thermal conductivity (0.35 W·m −1 ·K −1 ), and photothermal conversion. The phase change enthalpy can reach 130.7 J·g −1 and maintain a high energy storage density during 100 cyclic phase change tests. Specifically, MSHS@ODA decreases the operating temperature of lithium-ion batteries by 8 °C during discharge, ensuring their stable operation within the optimal temperature range. Based on the above merits, MSHS@ODA may find useful applications in solar thermal storage and effectively managing the thermal conditions of lithium-ion batteries.
研究领域:
材料科学
·
储能
·
太阳能
·
热管理
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Xiaoguang Zhao,Yili Tang,Jie Wang,Yihang Li,Daokui Li,Xiaochao Zuo,Huaming Yang
Fully stimulating the capacity of light-driven phase change materials (PCMs) for efficient capture, conversion, and storage solar energy requires an ingenious combination of PCMs, supporting structural materials, and photothermal materials, therefore motivating the synergistic effects between the components. Herein, this work thoroughly explores the interaction forces between PCMs and supporting structural materials and the synergy between PCMs and photothermal materials in photothermal conversion. Rejoicingly, when capitalizing on the prepared directional channel structure of hierarchically porous composite aerogel (PEPG) as a supporting structural material, a superior paraffin wax (PW) encapsulation rate of 85.11% is achieved, and the prepared PEPG2-PW has a high phase change enthalpy of 182.9 J/g. The van der Waals force and Lewis acid-base action between PEPG and PW molecules reveal the excellent stabilities of PEPG-PW. More importantly, the PEPG2-PW has an ultrahigh photothermal conversion efficiency of 95.2% under 1 sun irradiation and durability. Most importantly, the COMSOL Multiphysics software calculations demonstrate that transparent PW can anchor sunlight on the surface of graphite nanoplates, converting it into heat by enhancing the loss of graphite backbone lattice vibrations, and the accumulated heat is then stored in molten PW. This work provides some design principles for high-efficiency solar-thermal conversion materials.
研究领域:
材料科学
·
能源存储
·
光热工程
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纳米技术
·
复合材料
✓ 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）