CONSTRUCTION AND BUILDING MATERIALS
·
2025
·
IF 8
Wenxiu Jiao,Jiaxing Zhang,Zhiyong Zhang,Aimin Sha,Meng Jia
Adding phase change materials (PCMs) to asphalt pavements can effectively reduce temperature sensitivity and delay snow and ice accumulation. This study aims to develop solid-solid phase change materials (SSPCMs) for asphalt pavements, with a focus on winter road de-icing. First, the suitability of polyethylene glycol (PEG) and polytetramethylene ether glycol (PTMEG) with varying molecular weights as soft segments was systematically evaluated based on phase change performance, thermal stability, phase change cycling stability, and specific heat capacity. SSPCMs were synthesized using a two-step solution polymerization method, with successful synthesis confirmed by FTIR analysis. The influence of different soft-to-hard segment ratios on phase change performance was also examined. PTMEG2000 exhibited excellent performance, with an exothermic phase change temperature range from 8.5°C to -1.2°C and an enthalpy of 94.3 J/g. Its thermal decomposition onset temperature was 266.05°C, and its performance remained stable after 20 thermal cycles. The incorporation of hard segments led to a reduction in both phase change enthalpy and the initial phase change temperature. At a molar ratio of 4,4′-diphenylmethane diisocyanate (MDI) to PTMEG2000 of 2.4:1, the phase change temperature range was 4.1°C to -5.1°C, with an enthalpy of 37.1 J/g, demonstrating great potential as a de-icing material for roads in cold climates.
研究领域:
材料科学
·
土木工程
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Jiaqing He,Qiang Zhou,Zhiqing Ge,Shunfeng Jiang,Jiahe Li,Wei Feng,Haiyang Yang
Temperature-responsive hydrogels including lower critical solution temperature (LCST)- and upper critical solution temperature (UCST)-type hydrogels are attractive in various fields. However, the swift switch between LCST and UCST stimuli-responsive behaviors remains intriguing and challenging. Here is reported a kind of hydrogel with pH-gated LCST and UCST response behaviors. This is achieved using the hydrogen bonding between carboxylic acid groups of poly(acrylic acid- co -acrylamide) and hydroxyl groups of hydroxypropyl cellulose (HPC). The poly(acrylic acid- co -acrylamide)-HPC (PACA-HPC) hydrogels exhibit pH-gated reversible LCST-UCST phase transition behavior. When the transparent PACA-HPC hydrogel is placed in an acid bath, the COO − groups get protonated, rapidly forming hydrogen bonds with HPC to render a light-scattering state making the hydrogel opaque. Furthermore, the opaque hydrogel exhibits UCST phase transition behavior at 20–45 °C. When the opaque PCAC-HPC hydrogel is placed in an alkaline environment, hydrogen-bonded complexes gradually dissociate as the COOH groups are deprotonated to form a homogeneous transparent state. The transparent hydrogel exhibits LCST phase transition behavior at 20–45° C. Therefore, is shown the hydrogen bonding strategy to fabricate hydrogels with tunable LCST and UCST responses. With this pH-gated hydrogel with switchable LCST/UCST responsive behaviors, are demonstrated its applications in smart windows and information encryption.
研究领域:
材料科学
·
化学工程
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2025
·
IF 26.8
Guangfa Wang,Peijia Bai,Shaoheng Yuan,Yiwen Bo,Zhengxue Zhou,Ding Zhang,Rujun Ma
Electro-phase change materials (electro-PCM), based on the electrocaloric effect, have attracted significant attention and achieved rapid development in the field of cooling technology owing to their environmental protection, low energy consumption, and miniaturization. However, due to their limited isothermal entropy change and thermal conductivity, the cooling capacity of the electro-PCM devices has severely limited their cooling effect on electronic devices. Here, with the synergistic electro-thermal phase changes, the entropy change and thermal conductivity of electro-PCM are significantly improved by stacking it with thermo-phase change materials (thermo-PCM). Compared with that of the electro-PCM, the entropy change and thermal conductivity of electro-thermal phase change materials (ETPCM) stack can be up to 4.68-fold (from 28.31 to 132.35 J kg −1 K −1 at electric field of 100 MV m −1 ) and 2.39-fold (from 0.18 to 0.43 W m −1 ·K −1 ), respectively. The practicality of this strategy has also been fully validated by cooling a simulated electronic chip (1.75 W cm −2 ) with a temperature drop of 49.32 K after constructing ETPCM stack-based cooling device using the electrostatic actuation prototype. The synergistic enhancement of entropy change and thermal conductivity paves the way for the future direction of electrocaloric cooling toward interdisciplinary fusion.
研究领域:
材料科学
·
热工工程
·
应用物理
·
电子散热
·
能源效率
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2019
·
IF 3.42
Huiping Song,Xu Lei,Fangbin Xue,Haibin Wu,Fangqin Cheng
Composite phase-change coating with coal-fly-ash-based zeolite as carrier was investigated in this paper. Coal-fly-ash-based mesoporous zeolite was impregnated in the melted binary (capric acid–palmitic acid) / ternary (capric acid–palmitic acid–paraffin) phase-change substances to prepare the phase-change particles. Then these phase-change particles were used as the functional fillers to prepare the phase-change coatings. The phase-change temperatures of binary and ternary zeolite phase-change particles were 24.33 and 24.50 ℃ (at which the human body feels comfortable), and the phase-change latent heats were 66.36 and 83.52 J/g, respectively. Their thermal stabilities were also favorable. Based on the phase-change materials’ appearance and property tests, the phase-change coatings showed good energy-storage and temperature-regulation abilities when the mixing ratio of emulsion, kaolin, and phase-change particles was 6:5:2. Therefore, the phase change coating using zeolite phase change particles as filler is potential to conserve energy in buildings.
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2014
·
IF 5.03
Changzhong Chen,Wenmin Liu,Zhiqiang Wang,Kelin Peng,Wanli Pan,Qian Xie
This study deals with the preparation and characterization of the composites of polyethylene glycol (PEG)/the synthesized polymeric solid-solid phase change material (SSPCM) as novel form stable phase change material (FSPCM) for thermal energy storage . The synthesized SSPCM can play two roles in the FSPCM: the supporting material and the phase change working substance. The influence of PEG content on crystalline properties and phase change behaviors of the FSPCMs was investigated. The polarizing optical microscopy (POM) images of FSPCMs show that all FSPCMs have the spherocrystal morphology, and the spherocrystal size of SSPCM increases with the increasing of PEG percent. The results from differential scanning calorimetry (DSC) indicate that the prepared FSPCMs with different PEG contents have high thermal storage density, and the enthalpy efficiency of them is much higher than that of the traditional FSPCMs due to the synergistic phase change effect of PEG and SSPCM. The Fourier transform infrared spectroscopy (FTIR) spectrum and DSC curve of the FSPCMs after thermal cycling are almost the same as those of the original samples, which indicates that the FSPCMs have excellent thermal reliability and reusability . The work not only supplied a kind of novel FSPCMs with high performances, but also proposed a new way to solve the problem of enthalpy decline of traditional FSPCMs and synthesized polymeric SSPCMs compared with solid-liquid PCMs.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2019
·
IF 3.517
Yongyichuan Zhang,Xuelai Zhang,Xiaofeng Xu,Mengyao Lu
Phase change materials can store and release large amounts of heat over a small temperature range. Phase transition interval and phase change latent heat are important indicators for phase change materials, which determine phase change materials application in different temperature zones. Due to DSC has the quality error in sampling. Therefore, the T-history method is used here to derive the phase change interval, the phase change latent heat and the thermal conductivity of phase change materials. We chose CaCl 2 •6H 2 O composite SAT, DA-MA and OA phase change materials to improve the t-history method. The formula for phase transition interval, phase change latent heat and thermal conductivity is derived. The T-history method is more accurate and can compensate for the inaccuracy of DSC. The improved T-history method is not affected by mass, and the calculated thermophysical parameters are more representative, which is suitable for the parameter calculation of phase change materials with large mass.
研究领域:
材料科学
·
热物理学
✓ 已验证
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
RSC Advances
·
2016
·Vol. 6
·期 48
·42643-42648
·
IF 3.289
Xiaosheng Du,Haibo Wang,Xu Cheng,Zongliang Du
A novel phase change material (PCM), namely, comb polyurethane with polyethylene oxide segments as side chains (DMPEG–PU), was synthesized through the reaction between diethanolamine-modified monomethoxy polyethylene glycol (MPEG) with isophorone diisocyanate and 1,4-butanediol. The crystalline property, phase change property, and thermal stability were characterized by differential scanning calorimetry (DSC), thermogravimetric analysis (TG), wide-angle X-ray diffraction (WAXD), scanning electronic microscopy (SEM), and polarization optical microscopy (POM). An accelerated thermal cycling test was then conducted to reveal the thermal reliability of the synthesized DMPEG–PU. The WAXD patterns and POM images showed that the synthesized DMPEG–PU possesses a completely crystalline structure and smaller spherulites compared with the pristine MPEG. The DSC results showed that DMPEG–PU (with 85% weight percentage of MPEG) is a typical solid–solid PCM with high thermal transition enthalpy of more than 120 J g−1, which is higher than the thermal transition enthalpy of polyethylene glycol-based polyurethane. TG results showed that the synthesized DMPEG–PU exhibits satisfactory thermal stability.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
HEAT AND MASS TRANSFER
·
2021
·Vol. 58
·期 3
·407-417
·
IF 2.464
Zhang Dongxue,Wang Xin,Dong Yantao,Lu Nan,Lan Xiaozheng
Normal alkane tetracosane (C 24 ) as a representative compound containing alkyl chains was loaded into various porous materials to obtain form-stable phase change materials (PCMs). In the pores of controlled porous glasses (CPGs), silica gels (SGs), SBA-15 and KIT-6, C 24 acquired tunable phase transition temperatures. By changing the pore sizes, C 24 displayed regulated temperature windows of around 6 K (via melting) and 10 K (via solid phase transition) in the CPGs, 9 K in the SG pores (via melting) and about 13 K in SBA-15 (via melting). Phase transition temperatures, degree of supercooling and enthalpies of phase transitions exhibited linear dependence on the reverse pore diameter. The transition temperature and enthalpy change also had relevance to pore geometries. The phase sequences and solid structures of C 24 in the pores changed largely. The study provides an insight into thermal properties of nano-sized PCMs.
研究领域:
材料科学
·
热能工程
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 29
·14624-14633
·
IF 11.301
Changren Xiao,Guoqing Zhang,Zhenghui Li,Xiaoqing Yang
Despite being an advanced battery thermal management (BTM) strategy, the phase change material (PCM) cooling technology still suffers from the low thermal stability of the PCMs in practical applications, which leads to the leakage of the phase change ingredient, shape change or even collapse concerns under high temperature. Here we propose a creative idea for constructing a cross-linked polymeric structure with aliphatic side chains, namely, polymer PCM (PoPCM), through a facile one-step free-radical polymerization of octadecyl acrylate and crosslinkers. The aliphatic chains “tied up” on the cross-linked polymeric skeleton via “chemical bonding” and provided a high latent heat of 98.8 J g−1 without leakage, and therefore, delivered a stable solid–solid phase change behavior during long-term operation. The thermosetting 3-dimensional cross-linked structure simultaneously endowed the PoPCM with the anti-volume-expansion capability and excellent heat tolerance up to 250 °C without any deformation or leakage. When applied for BTM, the solid–solid PoPCM module demonstrated excellent and stable heat dissipation performance. The maximum temperature was 45.3 °C, and the temperature difference of the battery module could be controlled below 3.1 °C during the cyclic charge–discharge tests. Combining with the industrially available reagents and the simple preparation procedure at the kilogram level, we believe that this new strategy can present PCMs with superior feasibility for practical application in BTM.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
RENEWABLE ENERGY
·
2022
·
IF 8.634
Lu Liu,Xuelai Zhang,Xiangwei Lin
Benefitting from high storage density, phase change material (PCM) has been widely utilized in cold chain logistics. However, the phase change process of composites is normally non-isothermal, which will lead to phase change hysteresis (PCH). The exploration of the mechanism and influence factors of PCH remains a huge challenge. In this paper, a nanocomposite PCM (NCPCM) based on paraffin (PA) was prepared to address this issue via the two-step method. Here, the applications of multi-walled carbon nanotubes (MWCNTs) and sodium dodecylbenzene sulfonate (SDBS) were contributed to the enhancement of thermal conductivity and suspension stability. Subsequently, after various characterization techniques, the results showed that thermal conductivity of the NCPCM with 1.0 wt% MWCNTs and a 2:1 mass ratio of MWCNTs and SDBS increased by 1.86 times. Moreover, the NCPCM exhibited high thermal charging-discharging efficiency, thermal stability, and cyclic stability. More importantly, the PCH has been studied via the dynamic differential scanning calorimetry (DSC) method. The effects of temperature range, temperature changing rate, and sample mass on the hysteresis degree were investigated. Furthermore, the PCH was interpreted in terms of energy storage, temperature delay, internal thermal resistance , crystallinity , and interfacial free energy . It was proved that the NCPCM possesses a smaller hysteresis degree when the temperature range was −40–50 °C, temperature changing rate was 10 K min −1 , and sample mass was within 10 mg.
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
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
危险品化学品经营许可证（带存储）