Nano-Micro Letters
·
2023
·Vol. 15
·期 1
·1-12
·
IF 26.6
Liu Hanqing,Zhou Feng,Shi Xiaoyu,Sun Keyan,Kou Yan,Das Pratteek,Li Yangeng,Zhang Xinyu,Mateti Srikanth,Chen Ying,Wu Zhong-Shuai,Shi Quan
Phase change materials have a key role for wearable thermal management, but suffer from poor water vapor permeability, low enthalpy value and weak shape stability caused by liquid phase leakage and intrinsic rigidity of solid–liquid phase change materials. Herein, we report for the first time a versatile strategy for designed assembly of high-enthalpy flexible phase change nonwovens (GB-PCN) by wet-spinning hybrid graphene-boron nitride (GB) fiber and subsequent impregnating paraffins (e.g., eicosane, octadecane). As a result, our GB-PCN exhibited an unprecedented enthalpy value of 206.0 J g −1 , excellent thermal reliability and anti-leakage capacity, superb thermal cycling ability of 97.6% after 1000 cycles, and ultrahigh water vapor permeability (close to the cotton), outperforming the reported PCM films and fibers to date. Notably, the wearable thermal management systems based on GB-PCN for both clothing and face mask were demonstrated, which can maintain the human body at a comfortable temperature range for a significantly long time. Therefore, our results demonstrate huge potential of GB-PCN for human-wearable passive thermal management in real scenarios.
研究领域:
材料科学
·
纺织工程
·
热能工程
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Lanwei Li,Chengxiao Peng,Jing Chen,Zheng Ma,Yanqun Chen,Shuyao Li,Jianli Wang,Chao Wang
Phase transition will lead to abrupt change of thermoelectric material’s properties, which will have a negative influence on the application of thermoelectric device. Therefore, avoiding the phase transition of Ag 2 S is particularly important for its heat collection applications. In this work, we reported, for the first time, that Cu-Se co-alloying in Ag 2 S can suppress phase transition and improve thermoelectric properties. Specifically, different elements and compounds alloying in Ag 2 S samples were prepared, and their influences on the phase change behavior and thermoelectric performance stability of Ag 2 S are systematically studied. It is found that the free enthalpy decreases and the heat absorption peak disappears for the Cu-Se co-alloyed Ag 2 S sample. In addition, the average lattice thermal conductivity is greatly reduced, and the κ L of Ag 1.8 Cu 0.2 S 0.5 Se 0.5 is around 0.27 W m −1 K −1 from 330 K to 450 K. Therefore, a high ZT is obtained for Cu-Se co-alloyed Ag 2 S.
研究领域:
材料科学
·
凝聚态物理
·
热电材料
·
无机非金属材料
·
功能材料
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Qiao You,Mingxing Li,Ying Yuan,Xiaolan Liang,Yunhua Chen,Chaoyang Wang,Li Zhou,Tao Wang,Hongxia Liu
Solar energy interfacial evaporation represents a promising and sustainable approach with considerable potential for seawater desalination and wastewater treatment. Nonetheless, creating durable evaporators for continuous operation presents a challenge. Motivated by natural self-healing mechanisms, this study developed a novel 3D hybrid aero-hydrogel, which exhibited a self-healing efficiency of 89.4 % and an elongation at break post-healing of 637.7 %, featuring self-healing capabilities and continuous operation potential. Especially, the incorporation of hyperbranched water-soluble polymers (peach gum polysaccharide) endow the final solar water evaporators with a lower evaporation enthalpy of water, resulting in that the refined SVG3, with a notable water surface architecture and an expanded evaporation area, achieved a steam generation rate of 2.13 kg m −2 h −1 under 1 Sun. Notably, SVG2 achieved a high evaporation rate of 2.43 kg m −2 h −1 with the combined energy input of 1 Sun and 6 V, significantly surpassing the rate of 1.96 kg m −2 h −1 without voltage input. The results indicate that electrical energy significantly enhances and synergizes with SVG, facilitating continuous operation both day and night through the combined use of solar energy and electrical input. This study offers insightful perspectives for the strategic design of multifunctional hydrogels for solar water evaporation.
研究领域:
材料科学
·
环境科学
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2017
·
IF 3.648
Jialin Xie,Fang Wang,Dong Fu
The surface tensions (γ) of 2-diethylaminoethanol (DEAE)–tetramethylammonium glycinate ([N 1111 ][Gly]), DEAE–1-butyl-3-methylimidazolium glycinate ([Bmim][Gly]) and DEAE–1-butyl-3-methylimidazolium l -lysinate ([Bmim][Lys]) aqueous solutions were measured by using the BZY-1 surface tension meter. The temperature ranged from 303.2 K to 323.2 K. The mass fractions of DEAE and amino acid ionic liquids (AAILs) respectively ranged from 0.30 to 0.50 and 0.025 to 0.075. A thermodynamic equation was proposed to model the surface tension and the calculated results agreed well with the experiments. The effects of temperature and mass fractions of DEAE and AAILs on the surface tension were demonstrated on the basis of experiments and calculations. The surface enthalpy and surface entropy were determined and their concentration dependences were illustrated.
研究领域:
物理化学
·
表面科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2013
·
IF 2.297
Jun-Feng Wang,Xiao-Lan Wang
Two mixed alkali-alkaline earth metal borates of NaSrBO 3 and KSr 4 B 3 O 9 have been synthesized by high-temperature solid state reaction, which were further characterized by XRD, FT-IR, DTA-TG techniques and chemical analysis. The molar enthalpies of solution of NaSrBO 3 (s) and KSr 4 B 3 O 9 (s) in 2.00 cm 3 of 1 mol · dm −3 HCl(aq), at T = 298.15 K were measured to be −(206.84 ± 0.43) kJ · mol −1 and −(494.59 ± 0.53) kJ · mol −1 , respectively. The molar enthalpy of solution of NaCl(s) in 2.00 cm 3 of {1 mol · dm −3 HCl + H 3 BO 3 + Sr(OH) 2 · 8H 2 O}(aq) mixed solvent at T = 298.15 K was measured to be (5.17 ± 0.02) kJ · mol −1 . From these data and with the incorporation of the previously determined enthalpies of solution of H 3 BO 3 (s) in HCl(aq) of Sr(OH) 2 · 8H 2 O(s) in (HCl + H 3 BO 3 )(aq), and of KCl(s) in {HCl + H 3 BO 3 + Sr(OH) 2 · 8H 2 O}(aq), together with the use of the molar enthalpies of formation for NaCl(s)/KCl(s), Sr(OH) 2 · 8H 2 O(s), H 3 BO 3 (s), HCl(aq) and H 2 O(l), the standard molar enthalpies of formation of NaSrBO 3 (s) and KSr 4 B 3 O 9 were calculated to be −(1653.1 ± 1.4) kJ · mol −1 and −(5071.1 ± 3.4) kJ · mol −1 on the basis of the designed thermochemical cycles, respectively.
研究领域:
无机化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2023
·Vol. 15
·期 9
·2108
·
IF 5
Shi-Chang Hou,Dao-Wei Zhang,Jun Chen,Xiao-Xiao Guo,Abdul Haleem,Wei-Dong He
Because of the increasing scarcity of water resources, the desalination of seawater by photothermal evaporation with harvested solar energy has gradually become a popular research topic. The interconnected macroporous cryogel prepared from polymerization and crosslinking below the freezing temperature of the reactant solution has an excellent performance in photothermal water evaporation after loading photothermal materials. In this study, polyacrylamide (PAM) cryogels were prepared by cryo-polymerization and sulfonated in an alkaline solution containing formaldehyde and Na2SO3. Importantly, the evaporation enthalpy of water in sulfonated PAM cryogel was reduced to 1187 J·g−1due to the introduction of sulfonate groups into PAM, which was beneficial to increase the photothermal evaporation rate and efficiency. The sulfonated PAM cryogels loaded with polypyrrole and the umbrella-shaped melamine foam substrate were combined to form a photothermal evaporation device, and the evaporation rate was as high as 2.50 kg·m−2·h−1under one-sun radiation. Meanwhile, the evaporation rate reached 2.09 kg·m−2·h−1in the 14 wt% high-concentration saline solution, and no salt crystals appeared on the surface of the cryogel after 5 h of photothermal evaporation. Therefore, it was evidenced that the presence of sulfonate groups not only reduced the evaporation enthalpy of water but also prevented salting-out from blocking the water delivery channel during photothermal evaporation, with a sufficiently high evaporation rate, providing a reliable idea of matrix modification for the design of high-efficiency photothermal evaporation materials.Keywords:polymeric cryogel;polyacrylamide;photothermal evaporation;evaporation enthalpy;sulfonating modification
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FLUID PHASE EQUILIBRIA
·
2016
·
IF 1.846
Hua Sun,Lu Wang,Baoshu Liu
The solubility of α-glycine in water with different additives (sodium nitrate, ammonium nitrate , ammonium sulfate , and ammonium chloride) was measured under atmospheric pressure across the temperature range of (293.15–343.15) K at intervals of 10.00 K using a dynamic laser method. Solubility was found to increase with increasing temperature and additive level. The experimental data were correlated with the modified Apelblat model, nonrandom two-liquid model (NRTL), and λh model. The R 2 of the fitting regression indicated good applicability of these models to the glycine solubility data in the studied systems ( R 2 > 0.99). Apparent standard enthalpy, entropy, and Gibbs free energy changes of the solution were calculated based on the van't Hoff equation to elucidate the dissolution mechanism. The results showed that the dissolving process of glycine was endothermic, and the main dissolution driving force contributor was enthalpy in all the additive + water systems studied. By means of enthalpy-entropy compensation analysis, a non linear Δ H sol Θ versus Δ G sol Θ enthalpy-entropy compensation plot with positive and negative slopes was obtained for the systems studied. The evaluated values of H E showed that the mixing process of α-glycine in all the systems studied was exothermic.
研究领域:
物理化学
·
热力学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 20
·9723-9732
·
IF 8.867
Jiaguang Zheng,Xuezhang Xiao,Liuting Zhang,Shouquan Li,Hongwei Ge,Lixin Chen
A remarkable improvement in the hydrogen desorption performance of Mg(BH4)2–NaBH4 eutectic composite is achieved by simply ball-milling with fluorographene (FG). It is found that the desorption temperature of Mg(BH4)2–NaBH4 (∼200 °C) is still too high and liquid phase appears during dehydrogenation. Particularly, the novel bowl-like 3D Mg(BH4)2–NaBH4–FG composite can be formed after ball-milling. The novel Mg(BH4)2–NaBH4–FG exhibits a low dehydrogenation temperature of 114.9 °C with 6.9 wt% of pure hydrogen in seconds. In-depth investigations show that such greatly improved hydrogen desorption properties of the Mg(BH4)2–NaBH4–FG composite could be ascribed to both the “novel bowl-like 3D structure” with large specific surface area and the “reactant destabilized modification” owing to the decrease of the reaction enthalpy caused by the formation of NaMgF3. This finding provides a facile preparation of complex borohydride composites with low dehydrogenation temperature and fast rate, which accelerates its practical application in fuel cells.
研究领域:
材料科学
·
氢能存储
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2019
·
IF 2.298
Shuanshi Fan,Shali You,Yanhong Wang,Xuemei Lang,Chi Yu,Shenglong Wang,Zunzhao Li,Wentao Li,Yuanzhi Liu,Zheng Zhou
In this work, binary gas mixtures of 92 mol % CH4/CO2 and ternary gas mixtures of 87 mol % CH4/5 mol % C2H6/CO2 were studied as simulate associated petroleum gas. It mainly consists of two parts: one is the hydrate phase equilibrium of the binary and ternary gas mixtures both in water and 0.293 mol % tetra-n-butyl ammonium bromide (TBAB) solution by isochoric pressure-search method, and the other is the enthalpy of hydrate dissociation calculated by the Clausius–Clapeyron equation. The hydrate phase equilibrium measured temperature ranged from 278.61 to 289.46 K and pressure from 2.12 to 10.06 MPa with 24 points in total. The results show that the hydrate phase equilibrium line of 87 mol % CH4/5 mol % C2H6/CO2 + water was shifted about 2.4 K toward the higher temperature compared to that of 92 mol % CH4/CO2 + water. After adding 0.293 mol % TBAB, it could be found that the hydrate phase equilibrium line of binary gas mixtures and ternary gas mixtures in 0.293 mol % TBAB(aq) were shifted about 5.3 and 2.7 K toward the higher temperature compared to that of water. Besides, the enthalpy of the hydrate dissociation in 0.293 mol % TBAB(aq) is much higher than that in water. Average enthalpy of the hydrate dissociation of binary gas mixture hydrate increased from 62.46 kJ/mol in water to 160.21 kJ/mol in 0.0293 mol % TBAB(aq). Meanwhile the average enthalpy of hydrate dissociation of ternary gas mixture hydrate increased from 72.89 kJ/mol in water to 181.61 kJ/mol in 0.0293 mol % TBAB(aq).
研究领域:
化学工程
·
能源科学
✓ 已验证
DOI
高影响因子
Matter
·
2024
·
IF 17.3
Xueyan Hu,Peiying Hu,Ling Liu,Liming Zhao,Siyuan Dou,Weibang Lv,Yi Long,Jin Wang,Qingwen Li
Increasing extreme heat stress puts humans at risk of heat stroke and dehydration in outdoor environments. However, current personal thermal management (PTM) approaches in hot summers suffer from low cooling efficiency. Here, we designed a lightweight, hierarchically porous hydrogel (HPHG) with low density, robust breaking strength, high evaporation enthalpy, high solar reflectance, and infrared emissivity, and controlled evaporation speed. The HPHG shows strong and prolonged passive cooling: sub-ambient temperature cooling up to 22.5°C under direct sunlight and a prolonged cooling time of >15 h. The HPHG can also be fabricated into a lightweight cooling vest (<350 g), achieving an average temperature drop of 11°C compared to air temperature. The concept of HPHG proposed in this study opens an avenue for hydrogel as a lightweight and wearable material in PTM and solves the bottleneck problem of passive cooling under extreme heat stress in an outdoor environment.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Senliang Xi,Xiaojun Wang,Kudzaishe Caren Tome,Tonghuan Zhang,Zongying Han,Meng Gao,Shixue Zhou,Hao Yu
The hydrogen storage performances of MgH 2 improved by the addition of Ni and SAPO-34 were studied in detail. The mixture of MgH 2 with Ni and SAPO-34 was a physical reaction as shown by the X-ray diffraction (XRD) results. The SAPO-34 and Ni were uniformly distributed on the surface of MgH 2 . The thermodynamic and kinetic properties of 90MgH 2 /5Ni/5SAPO-34 were investigated by differential scanning calorimetry (DSC) and pressure-composition-isothermal (PCI) methods. The results showed that the dehydrogenation activation energy of 90MgH 2 /5Ni/5SAPO-34 decreased by 64.3 kJ/mol compared with that of MgH 2 . In addition, the relationship between the value of dehydrogenation heat and hydrogen content was also investigated by in-situ calorimetry. The enthalpy value of each sample in the dehydrogenation processes were calculated by in-situ calorimetry measurement. The dehydrogenation enthalpies of as-milled MgH 2 and 90MgH 2 /5Ni/5SAPO-34 were 63.2 kJ/mol H 2 and 53.6 kJ/mol H 2 , respectively. Thus, the co-doping of Ni and SAPO-34 contributed significantly to decrease the thermodynamic stability and improve the hydrogen sorption kinetic properties of MgH 2 .
研究领域:
材料科学
·
氢储能技术
·
物理化学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2016
·
IF 1.835
Peipei Zhu,Yanxin Chen,Yanan Zhou,Yan Xiao,Jinbo Ouyang,Xin Huang,Gaohong He,Baohong Hou,Wei Chen
In this work, solubility data of 1,3-dimethylurea (DMU) in methanol, ethanol, 1-propanol, 1-butanol, 1-pentanol, 1-hexanol, 1-heptanol, and 1-octanol were measured by synthetic method from T = 288.15 to 328.15 K at ordinary pressure. It turned out that the solubility data increased as temperature and solvent polarity increased. The molecular interactions in solution have been studied by the linear energy relationship. Furthermore, based on two thermodynamic models (i.e., modified Apelblat and Wilson), the experimental results were fitted and analyzed. Finally, the thermodynamic properties of solution, including entropy, enthalpy, and Gibbs energy were calculated. These results indicate that in all selected solvents the dissolution behavior were endothermic, entropy-driven, and not spontaneous.
研究领域:
物理化学
·
热力学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）