Journal of Materiomics
·
2024
·
IF 8.4
Yingzhi Meng,Silin Tang,Zhaojie Wang,Xiang Niu,Hongfang Zhang,Dingyuan Wang,Yisong Bai,Biaolin Peng,Sheng-Guo Lu,Qingqing Ke,Laijun Liu
The electrocaloric effect (ECE) offers a pathway to environmentally sustainable and easily miniaturized refrigeration technology, positioning it as a front-runner for the next generation of solid-state cooling solutions. This research unveils a remarkable ECE in a finely tuned (Ba 0.86 Ca 0.14 ) 0.98 La 0.02 Ti 0.92 Sn 0.08 O 3 ceramic, exhibiting a temperature shift (Δ T ) of 1.6 K across more than 85% of the maximum Δ T (Δ T max ) and spanning an exceptionally wide operational range of 92 K. Our investigation on dielectric responses and ferroelectric polarization-electric field ( P–E ) loops suggests that the broad operational scope results from the fragmentation of extended ferroelectric domains into smaller domains and polar nano-regions (PNRs) supported by PFM analysis. Furthermore, the introduction of La enhances spontaneous polarization by significantly extending the maximum electric field that can be applied, facilitating high-performance ECE at ambient temperature. This study positions BaTiO 3 -based lead-free ceramic as a sustainable alternative for addressing the cooling demands of modern electronic components, marking a significant stride toward next-generation solid-state refrigeration.
研究领域:
材料科学
·
固态制冷技术
✓ 已验证
DOI
高影响因子
Entropy
·
2022
·Vol. 24
·期 6
·765
·
IF 2.738
Haopeng Zeng,Yu Zhang,Lei Zhang,Zhaoyang Chen,Xiaosen Li
Depressurization combined with brine injection is a potential method for field production of natural gas hydrate, which can significantly improve production efficiency and avoid secondary formation of hydrate. In this work, the experiments of hydrate production using depressurization combined with brine injection from a simulated excess-water hydrate reservoir were performed, and the effects of NaCl concentration on hydrate decomposition, temperature change, and heat transfer in the reservoir were investigated. The experimental results indicate that there is little gas production during depressurization in a excess-water hydrate reservoir, and the gas dissociated from hydrate is trapped in pores of sediments. The high-water production reduces the final gas recovery, which is lower than 70% in the experiments. The increasing NaCl concentration only effectively promotes gas production rate in the early stage. The final cumulative gas production and average gas production rate have little difference in different experiments. The NaCl concentration of the produced water is significantly higher than that which is in contact with hydrate in the sediments because the water produced by hydrate decomposition exists on the surface of undissociated hydrate. The high concentration of NaCl in the produced water from the reactor significantly reduces the promoting effect and efficiency of NaCl solution on hydrate decomposition. The injection of NaCl solution decreases the lowest temperature in sediments during hydrate production, and increases the sensible heat and heat transfer from environment for hydrate decomposition. The changes of temperature and resistance effectively reflect the distribution of the injected NaCl solution in the hydrate reservoir.
研究领域:
能源科学
·
地质学
·
化学工程
✓ 已验证
DOI
高影响因子
Advanced Energy Materials
·
2022
·Vol. 13
·期 2
·2202643
·
IF 29.698
Hui Wang,Xiao Jiang,Yuexian Cao,Lulu Qian,Yang Liu,Min Huang,Chunfu Zhang,Yue Hao,Kai Wang,Shengzhong(Frank) Liu
Perovskite solar cells (PSCs), have exhibited potential value for revolutionizing photovoltaic technology for space applications, and they have passed a series of tests in a simulated space environment. Nevertheless, the simulated space environment on land is definitely distinguished from the real-space conditions, and the results cannot completely represent the real operating state of PSCs in space. Herein, PSCs mounted on a high-altitude balloon are launched into near-space and the current–voltage characteristics are measured in situ throughout the 19-h flight, during which the PSCs are exposed directly to near-space and experience wide temperature variation, vacuum, and strong irradiation. Thus, the diurnal performance evolution of PSCs is obtained for the first time and a possible variation mechanism is identified. The PSCs present expected stability and a champion power density of ≈12 mW cm −2 at noon, which is demonstrated as the highest result achieved in near-space for PSCs. Additionally, despite a complex degradation process, the PSCs still deliver a high energy density comparable to that of silicon solar cells. Finally, the challenges facing the space application of PSCs are discussed. This work highlights the feasibility of PSCs in near space and provides direction for further exploration.
研究领域:
材料科学
·
空间科学
✓ 已验证
DOI
高影响因子
Nano Energy
·
2021
·
IF 17.881
Changhong Yang,Chao Feng,Panpan Lv,Jin Qian,Yajie Han,Xiujuan Lin,Shifeng Huang,Xin Cheng,Zhenxiang Cheng
The solid-state cooling technique utilizing electrocaloric (EC) materials is an alternative approach to tackle the greenhouse effect caused by traditional vapor-compression refrigeration. However, such a promising technique is severely hampered by the lack of proper materials considering that most existing EC materials with a single positive/negative EC effect exhibit a limited cooling effect. Here, the coexistence of a positive and negative EC effects has been achieved in a lead-free Na 0.5 Bi 0.5 (Ti 0.97 W 0.01 Fe 0.02 )O 3 ferroelectric film . A state-of-the-art positive adiabatic temperature change (Δ T ) of ~56 K accompanied by an isothermal entropy change (Δ S ) of ~64 J K −1 kg −1 at 143 °C and a large negative Δ T of ~ − 17 K with a Δ S of ~ − 24 J K −1 kg −1 at 55 °C are obtained under a strong electric field strength of 2692 kV cm −1 . Oxygen vacancy-related defect dipoles play a critical role in the negative EC effect at lower temperatures, while the phase transition is responsible for the positive EC effect at higher temperatures. Meanwhile, the film exhibits a high EC strength with a maximum Δ T /Δ E of 0.021 K cm kV −1 , together with a Δ S /Δ E of 0.024 J cm K −1 kg −1 kV −1 . This work ensures a giant total temperature change by utilizing and combining both the negative and positive EC effects in a dual cooling process.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
POLYMER COMPOSITES
·
2025
·
IF 4.7
Xiaofang Zhang,Weimin Xia,Yinghui Wang,Yingjuan Yan,Xusheng Wang
The electrocaloric effect (ECE) in ferroelectric materials is considered a candidate for solid-state refrigeration technology due to its merits of environmental friendliness, high integration, and low energy consumption. Herein, a series of poly(vinylidene fluoride-trifluoroethylene-chlorotrifluoroethylene) (P(VDF-TrFE-CTFE)) terpolymers are synthesized by using the hydrogenation method and are then compounded with the conductive filler graphene nanosheets (GR) to obtain GR/P(VDF-TrFE-CTFE) composites. Benefiting from the large specific surface area of GR, the interfacial polarization of GR/P(VDF-TrFE-CTFE) composite is significantly improved, contributing to a high maximum polarization (~2.35 μC/cm 2 ). As such, a maximum adiabatic temperature change (Δ T ) of ~4.22 K (at 320.6 K) is realized in GR/P(VDF-TrFE-CTFE) composite with 0.05 wt% GR at a low electric field of 50 MV/m, which is an improvement of 51.8% compared to the pure P(VDF-TrFE-CTFE) (Δ T is ~0.08 K at 320.5 K). This result indicates the latent capacity of GR fillers in increasing the ECE of ferroelectric polymer materials, providing a new approach for designing the optimal filler/polymer combination suitable for solid-state refrigeration.
研究领域:
材料科学
·
高分子科学
·
固态制冷
·
纳米技术
·
电热效应
✓ 已验证
产品关联
DOI
高影响因子
Journal of Nano Research
·
2022
·
IF 1.78
Rusul Mohammed Abdallah,Raad M.S. Al-Haddad
There are many methods for synthesizing magnetite nanoparticles. Most methods take a long time, and the result is undesirable. In this paper a green method was used to synthesize nanoparticles because it takes a short time and is both straightforward and eco-friendly. It is done by adding : =1:2 molar ratio solution with different amounts of extract and different amounts of NaOH solution for 20 min at different temperatures, in hotplate stirrers, to control their relative size. UV-Vis spectroscopy, vibrating sample magnetometer technique (VSM), transmission electron microscopy (TEM), and X-ray diffraction (XRD) were used to characterize the magnetite nanoparticles. The result confirms that the changes in amounts of NaOH and extract led to a change in the pH of a solution and that the increase in amounts of the extract caused the low addition of NaOH. These changes influenced the process of synthesis and characterization. The Uv-vis analysis confirms that the surface plasmon resonance had a highly visible brad peak in the 290–460 nm range, as well as a peak shift to shorter wavelengths (blue shift) with a pH change and a peak shift to longer wavelengths (red shift) with a temperature change. TEM imaging confirms that all the synthesized had a spherical shape with size changed according to a parameter change of within 40–9 nm. Magnetic analysis showed the magnetite nanoparticles synthesized have smaller sizes and are superparamagnetic with the influence of particle size on the magnetic properties, including Hc, Ms, and Mr.
研究领域:
材料科学
·
纳米技术
·
化学
·
物理学
✓ 已验证
DOI
高影响因子
Advanced Optical Materials
·
2022
·Vol. 10
·期 10
·2102200
·
IF 10.05
Chong Zhao,Yingkui Li,Wanggui Ye,Xiaofei Shen,Zicheng Wen,Xuanyi Yuan,Yongge Cao,Chaoyang Ma
Colloidal all-inorganic lead halide perovskite nanocrystals (LHP NCs) feature with tunable high-efficiency photoluminescence from blue to red for optoelectronic applications but suffer from instability under water moisture, UV light illumination, high-temperature shock, as well as oxygen erosion. Previous work to improve LHP NCs stability was mainly focused on either glass bulk sealed LHP quantum dots (QDs) with low quantum efficiency, or mesoporous silica matrixes confined LHP QDs with organic ligands still existing. Here, a facile, noncolloidal, ligand-free LHP QDs growth with physical confinement is proposed by integrating the growth of perovskite QDs with the fabrication process of hydrophobic silica-aerogel powders (SAPs). As a result, the as-synthesized mono- and mixed-cesium-lead-halide QDs @ SAPs composites show tunable photoluminescence from purple to deep red. Besides, the Pr 3+ ions doped CsPbBr 3 QDs @ SAPs composites exhibit moderate quantum efficiency, excellent stability under UV illumination, water moisture as well as temperature variation. Furthermore, performances of white LED device encapsulated Pr 3+ doped composite with blue GaN chip and commercial red (Sr, Ca)AlSiN 3 :Eu 2+ phosphor are evaluated. This work demonstrates a facile and general strategy for synthesizing high-stable all-inorganic cesium-lead-halide QDs for applications in white LED and display devices.
研究领域:
材料科学
·
光电技术
·
纳米技术
·
光子学
✓ 已验证
DOI
高影响因子
MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 9
·1-9
·
IF 5.3
Liu Shendong,Chen Xinlian,Zhao Hong,Lin Tianran,Hou Li,Zhao Shulin
An ultrasensitive photothermal assay was designed for point-of-care testing (POCT) of tumor markers based on a filter membrane. Firstly, Cu 2-x Se was successfully encapsulated in liposome spheres with biotin on the surface and connected to carcinoembryonic antigen (CEA) aptamer with 3'end modified biotin by streptavidin. Secondly, the CEA antibody was successfully modified on the surface of the nitrocellulose membrane through simple incubation. Finally, the assay process was completed using a disposable syringe, and the temperature was recorded using a handheld infrared temperature detector. In the range 0–50 ng mL −1 , the temperature change of the nitrocellulose membrane has a strong linear relationship with CEA concentration, and the detection limit is 0.097 ng mL −1 . It is worth noting that the entire testing process can be easily performed in 10 min, much shorter than traditional clinical methods. In addition, this method was successfully applied to the quantitative determination of CEA levels in human serum samples with a recovery of 96.2–103.3%. This rapid assay can be performed by “one suction and one push” through a disposable syringe, which is simple to operate, and the excellent sensitivity reveals the great potential of the proposed strategy in the POCT of tumor biomarkers. Graphical Abstract
研究领域:
生物医学工程
·
分析化学
·
即时诊断
·
癌症生物标志物
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-9
·
IF 14.7
Zhang Shixian,Fu Yuheng,Nie Xinxing,Li Chenjian,Zhou Youshuang,Wang Yaqi,Yi Juan,Xia Wenlai,Song Yiheng,Li Qi,Xiong Chuanxi,Qian Suxin,Yang Quanling,Wang Qing
Room-temperature elastocaloric cooling is considered as a zero-global-warming-potential alternative to conventional vapor-compression refrigeration technology. However, the limited entropy and large-deformation features of elastocaloric polymers hinder the creation of the breakthrough in their caloric responses and device development. Herein, we report that the addition of a small amount of inorganic nanofillers into the polymer induces the aggregate of the effective elastic chains via shearing the interlaminar molecular chains, which provides an additional contribution to the entropy in elastocaloric polymers. Consequently, the adiabatic temperature change of −18.0 K and the isothermal entropy change of 187.4 J kg −1 K −1 achieved in the polymer nanocomposites outperform those of current elastocaloric polymers. Moreover, a large-deformation cooling system with a work recovery efficiency of 56.3% is demonstrated. This work opens a new avenue for the development of high-performance elastocaloric polymers and prototypes for solid-state cooling applications.
研究领域:
材料科学
·
热力学
·
高分子科学
·
能源工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Small
·
2018
·Vol. 14
·期 15
·1704039
·
IF 9.598
Danya Lyu,Shanshan Chen,Weiwei Guo
A novel stimuli-responsive hydrogel system with liposomes serving as both noncovalent crosslinkers and functional small molecules carriers for controlled-release is developed. Liposomes can crosslink polyacrylamide copolymers functionalized with cholesterol-modified DNA motifs to yield a DNA hydrogel system, due to the hydrophobic interaction between cholesteryl groups and the lipid bilayer of liposomes. Functional information encoded DNA motifs on the polymer backbones endow the hydrogel with programmable smart responsive properties. In a model system, the hydrogel exhibits stimuli-responsive gel-to-sol transformation triggered by the opening of DNA motifs upon the presence of a restriction endonuclease enzyme, EcoR I, or temperature change, realizing the controlled-release of liposomes which are highly efficient carriers of active small molecules payloads. Two active molecules, 1,1-dioctadecyl-3,3,3,3-tetramethylindodicarbocyanine perchlorate (DiIC18(5)) and calcein, are chosen as the hydrophobic and hydrophilic model payloads, respectively, to address the feasibility of the releasing strategy. Moreover, the hydrogel exhibits injectable property as well as self-recovery behaviors.
研究领域:
材料科学
·
生物材料
·
纳米技术
·
药物递送系统
·
生物医学工程
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2020
·
IF 5.065
Renren Sun,Yueru Wang,Haixia He,Yameng Wan,Liyuan Li,Jiao Sha,Gaoliang Jiang,Yu Li,Tao Li,Baozeng Ren
Solubility of melatonin in twelve mono-solvents including seven alcohols {methanol (MT), ethanol (ET), n -propanol ( n -PrA), n -butanol ( n -BT), i -butanol ( i -BT), n -pentanol ( n -PT) and n-hexanol ( n -HeA)} and five esters {methyl acetate (MeAC), ethyl acetate (EtAC), n -propyl acetate ( n -PrAC), n -butyl acetate ( n -BtAC) and n -pentyl acetate ( n -PtAC)} was determined by laser monitoring approach from 278.15 K to 323.15 K under 0.1 MPa. The experimental results indicate that the mole solubility of melatonin shows a positive relation with temperature variation. The solubility of melatonin in the twelve pure solvents at 298.15 K has order: MT (0.03570) > ET (0.02536) > n -PrA (0.01965) > n -BT (0.01524) > n -PT (0.01450) > i -BT (0.01267) > n -HeA (0.01136) > MeAC (0.008498) > EtAC (0.006587) > n -PrAC (0.004280) > n -BtAC (0.003410) > n -PtAC (0.02990). Moreover, the miscibility behavior of melatonin was further analyzed by the Hansen solubility parameter (HSP). The solvent effect of melatonin in tested pure solvents was investigated by using the KAT-LSER model. The four thermodynamic models including two-Suffix Margules, NRTL, NRTL-SAC and UNIQUAC models were applied to correlate the experimental solubility data of melatonin. Furthermore, the dissolution thermodynamic properties including the apparent standard dissolution enthalpy (Δ dis H o ), the apparent standard dissolution entropy (Δ dis S o ) and the apparent standard Gibbs energy change (Δ dis G o ) of melatonin in investigated solvents were calculated by van't Hoff equation.
研究领域:
药学
·
物理化学
·
热力学
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）