AICHE JOURNAL
·
2023
·
IF 3.7
Jingwei Zhang,Jianhong Xu,Zhuo Chen
Micro-packed beds have the advantages of excellent heat and mass transfer efficiency and high safety, which have been successfully applied to hydrogenation and oxidation reactions. The dispersion behavior of multiphase flow is closely related to mass transfer and reaction performance. However, the study of dispersion law in micro-packed beds is not sufficient. This work investigated the dispersion behavior of gas–liquid/liquid–liquid two-phase flow in micro-packed beds. The average size and distribution of droplets/bubbles were measured in different systems. Key parameters that affect the dispersion characteristics of the two phases were observed experimentally, including gas/liquid phase flow rate, size of the packing, and physical parameters of the systems. The experimental results showed that gas–liquid and liquid–liquid dispersion processes exhibited different characteristics due to the different physical parameters of liquid and gas as the dispersed phase. The fracture driving force of the gas–liquid process was mainly from the continuous liquid phase, while the fracture driving force of the liquid–liquid process came from both the dispersed phase and the continuous phase.
研究领域:
化学工程
·
传热传质学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Chao Deng,Xiaoxin Li,Mustafa Kemal Bayazit,Barun Kumar Chakrabarti,Guo-Ming Weng
The polysulfide/iodide flow battery is a promising candidate for large-scale energy storage systems, but the technology suffers from a notably low Coulombic efficiency. This phenomenon arises because the crossover of hydroxide ions triggers the disproportionation reaction of I3– ions in the posolyte. To mitigate these issues, a middle chamber filled with Na2SO4 solution is created between two cation-exchange membranes to separate the posolyte and negolyte chambers of the PSIFB, thereby constructing a trichamber reactor. This middle chamber can serve as a reservoir for the cross-transportation OH– ions during charge-discharge processes, thereby minimizing their adverse effects on the posolyte. Experimental results reveal that the introduction of the middle chamber leads to a 97.3% reduction in the concentration of OH– ions within the posolyte. Furthermore, finite element analysis demonstrates that the trichamber configuration significantly reduces the flux of OH– ions entering the posolyte, achieving levels even lower than half of those in the dual-chamber structure. This innovative architecture markedly enhances the Coulombic efficiency from approximately 78% in the dual-chamber structure to around 91% in the trichamber structure with a high-concentration electrolyte (4 M NaI and 3 M Na2S2), while concurrently sustaining a highly competitive energy density of 20.05 W h Lposolyte+negolyte–1 at 75% state-of-charge. These findings demonstrate an effective strategy for improving the performance of the polysulfide/iodide flow battery through OH– management, showing potential for developing more efficient flow battery systems for renewable energy storage applications
研究领域:
电化学能源存储
·
液流电池技术
·
电化学工程
·
可再生能源存储
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
·
2021
·
IF 9.127
Lixing Xia,Wenbo Huo,Huaizhi Gao,Heng Zhang,Fengming Chu,Hao Liu,Zhan'ao Tan
Solubility of redox active materials (RAMs) is key to realize high volume capacity and energy density in aqueous organic redox flow batteries (AORFBs). In anthraquinone (AQ)-based RAMs, hydrophilic groups substituted at β-sites (2,3,6,7) are expected to improve water-miscibility much better than α-sites (1,4,5,8). In this work, we find an anomalous case: 3-((9,10-dioxo-9.10-dihydroanthracen-2-yl)amino)-N,N,N-trimethylpropan-1-aminium chloride (2-DPAQCl) functioned with the hydrophilic groups surprisingly exhibits poor solubility with less than 0.05 M, however its isomer 3-((9,10-dioxo-9,10-dihydroanthracen-1-yl)amino)-N,N,N-trimethylpropan-1-aminium chloride (1-DPAQCl) shows high solubility at 1.44 M in water. The results from 1 H nuclear magnetic resonance (NMR) and infrared (IR) spectra suggest that intermolecular hydrogen bonds (HBs) are formed between N–H donors and Cl − acceptors in 2-DPAQCl, which is different from the case for 1-DPAQCl that N–H donors interact with neighboring C O acceptors as intramolecular HBs. Benefited from the intramolecular HBs, water is prone to break the interaction between solute molecules than that in 2-DPAQCl, leading to better water-solubility. Electrochemical investigations indicate that the peak-to-peak separations ΔE pp of 1-DPAQCl is very narrow in unbuffered aqueous solution as well as in buffered aqueous solution at pH 7.0, implying its highly electrochemical reversibility and facile reaction kinetics, which further indicates 1-DPAQCl is suitable to serve as a negative RAM for neutral AORFBs.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Yanhao Liu,Shubin Li,Jiang Zhu,Lili Fan,Lu Wang
Excessive blood loss caused by severe trauma is often life-threatening, so a kind of hemostatic material with superior performance is urgently needed to achieve rapid hemostasis of wounds. Here, we prepared CDCS/PF/PVA/Agar hydrogels by blending chitosan modified by catechol groups, PF127-NH 2 micelles, PVA and agarose. The hydrogel showed adjustable swelling and degradation properties. The CDCS/PF/PVA/Agar hydrogel exhibited exceptional mechanical properties with an elastic modulus of 351.4 kPa after four freeze-thaw cycles, surpassing traditional polysaccharide hydrogels by 7–20 fold. Its tissue adhesion strength reached 16.24 kPa in air and 11.23 kPa under wet conditions, enabled by catechol-mediated covalent bonding and amino group interactions. In vivo experiments demonstrated rapid hemostasis within 170 s in mouse liver injury models, reducing blood loss by 75.4 % compared to untreated controls. This study provides a robust strategy for designing polysaccharide hydrogels integrating mechanical resilience, rapid hemostasis, antibacterial activity, and biosafety, offering significant potential for clinical wound management.
研究领域:
生物医学工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MACROMOLECULES
·
2018
·
IF 5.914
Zhukang Du,Xiaolong Yan,Renfeng Dong,Kang Ke,Biye Ren,Zhen Tong
Telechelic associative polymers (TAPs) can form a dynamic transient network in water and have been widely used as rheological modifiers for improving solution rheological properties in many industrial fields. In this work, we designed and prepared a novel photoresponsive coumarin-functionalized telechelic associative model polymer (CouTAP), which was used to investigate the influence of light-induced dimerization of coumarin end groups on the polymer structure and solution rheological properties. The effects of light intensity, irradiation time, polymer concentration, and temperature on the transient network and rheological behavior of the CouTAP aqueous solution were studied in detail. The rheological properties of the dimerized CouTAP aqueous solution show weak temperature dependence, and the dynamics hardly depends on concentration due to the transformation of triblock to multiblock polymers. A novel transient network model composed of train loops and bridges covalently linked to train loops was proposed to describe the unique solution properties. This work will not only provide new insights into the influence of the light-induced dimerization of coumarin end groups on the network structure and rheological properties of CouTAP solution but also opens a new perspective for the controlled self-assembly of amphiphilic polymers and some special applications of TAPs in the manufacturing and transmission of soft materials, waterborne coating, inks, medicines, cosmetics, and so on.
研究领域:
高分子化学
·
材料科学
·
流变学
✓ 已验证
产品关联
DOI
高影响因子
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
·
2023
·Vol. 120
·期 28
·e2302907120
·
IF 11.1
Xiaoguang Li,Xianglong Pang,Haohao Jiang,Mei Duan,Heng Liu,Zhujun Yang,Yuhang Xi,Thomas P. Russell
Millifluidics, the manipulation of liquid flow in millimeter-sized channels, has been a revolutionary concept in chemical processing and engineering. The solid channels that contain the liquids, though, are not flexible in their design and modification, and prevent contact with the external environment. All-liquid constructs, on the other hand, while flexible and open, are imbedded in a liquid environment. Here, we provide a route to circumvent these limitations by encasing the liquids in a hydrophobic powder in air that jams on the surface, containing and isolating flowing fluids, offering flexibility and adaptability in design, as manifest in the ability to reconfigure, graft, and segment the constructs. Along with the open nature of these powder-contained channels that allow arbitrary connections/disconnections and substance addition/extraction, numerous applications can be opened in the biological, chemical, and material arenas.
研究领域:
化学工程
·
生物学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 50
·76263-76274
·
IF 5.19
Zhou Anhui,Qiu Zhaofu,Yang Ji,Yan Ruiqi
The all-vanadium redox flow battery (VRFB) is becoming a promising technology for large-scale energy storage due to its advantages such as scalability and flexibility. In recent years, the VRFB has been successfully developed and put into use in many countries. It is expected that the abandoned VRFB will generate a large amount of vanadium waste. To our knowledge, there are few reports on the disposal of spent VRFBs. Herein, chitosan-coated nano-zero-valent iron (CS-Fe 0 ) is proposed for the first time as adsorbents for the treatment of spent VRFBs. It can provide a new approach to deal with the upcoming large number of spent VRFBs. The calculated maximum adsorption capacity for V(V) of chitosan and CS-Fe 0 reached 209.5 and 511.3 mg/g at 288 K, respectively. CS-Fe 0 showed better adsorption performance than chitosan under different pH conditions and is easy to be separated from the liquid phase. The Freundlich isotherm was suitable for the adsorption process of chitosan, and CS-Fe 0 was more consistent with the Langmuir isotherm. Ionic strength (0.05–0.5 M) had a positive effect on the adsorption capacity of CS-Fe 0 , and the influence of coexisting anions on CS-Fe 0 could be negligible. FTIR and XPS analyses revealed that the primary mechanisms were the electrostatic attraction of chitosan and redox of Fe 0 . The present study confirmed that CS-Fe 0 could be a potential material to efficiently trap V(V) from the VRFB electrolyte.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Carbon Neutralization
·
2024
·
IF 0
Longwei Li,Rongrong Li,Shaojie Zhou,Wenjun Xu,Yu Li,Jingmin Zhang,Lei Gao,Xiong Pu
Zinc bromine flow batteries (ZBFBs) are well suited for stationary energy storage due to their attractive features of high energy density and low cost. Nevertheless, the ZBFBs suffer from low power density and limited efficiency owing to the relatively severe polarization of the Br 2 /Br − redox couple. Herein, a three-dimensional (3D) hierarchical composite electrode based on core-shell Ni/NiO heterostructures anchored on graphite felt (Ni/NiO@GF) is designed to promote the kinetics of the Br 2 /Br − couple, so as to improve the power density and efficiency of the ZBFB. In this design, the highly conductive carbon felt and Ni cores provide a composite electrode with a 3D electron transporting framework to guarantee excellent electronic conductivity, while the NiO shells possess great absorption ability to Br 2 and brilliant catalytic activity for the Br 2 /Br − redox reaction to reduce the electrochemical polarization. As a result, an enhanced ZBFB with Ni/NiO@GF electrode shows an outstanding energy efficiency of 86% at 20 mA cm −2 and can be operated at a current density of up to 160 mA cm −2 with a respectable energy efficiency of 67%. These results exhibit a promising strategy to fabricate catalytic electrodes for high-performance ZBFBs.
研究领域:
电化学
·
能源存储
·
材料科学
✓ 已验证
DOI
Talanta Open
·
2024
·
IF 4.1
Mingtao Sun,Yiyu Jiang,Wenshan Liang,Hui Zeng,Huiwen Chen,Min Zhang
An affordable droplet-based flow analyzer incorporating peristaltic micro-pumps has been developed for fluorescent ammonium sensing. The cost-effective peristaltic micro-pumps, modified using 3D-printing techniques, feature a 3D-printed pump base integrated with a Hall sensor to monitor the rotation of the pump motor. This setup generates a pulse flow instead of a continuous flow, delivering specific volumes (typically between 3 to 4 μL) of solution with each rotation. By using separate pumps to deliver the aqueous and oil phases, these phases merge to form a droplet flowing stream. The relative standard deviation (RSD) values for droplet volumes range from 3.97 % to 5.99 % ( n =50) across different pumps. The analyzer utilizes a reaction between ammonium, ortho-phthalaldehyde, and sulfite to produce a fluorescent derivative, allowing for sensitive detection of low ammonium concentrations. A custom light-emitting diode (LED)-based fluorescence detector has been fabricated using 3D printing, ensuring cost-effective production. The analyzer provides a limit of detection of 0.02 μM (3 σ ) and an RSD of 0.15 % ( n =10, 1 μM ammonium). This analyzer offers several practical advantages, including reduced reagent consumption and the potential for further development in distributed on-site analysis. The use of 3D printing facilitates rapid prototyping and customization, making the system adaptable to various analytical applications.
研究领域:
分析化学
·
环境科学
·
生物技术
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-11
·
IF 15.7
Wang Zhigui,Lu Guolong,Wei Tianran,Meng Ge,Cai Haoxiang,Feng Yanhong,Chu Ke,Luo Jun,Hu Guangzhi,Wang Dingsheng,Liu Xijun
Aqueous redox flow batteries (RFBs) incorporating polysulfide/iodide chemistries have received considerable attention due to their safety, high scalability, and cost-effectiveness. However, the sluggish redox kinetics restricted their output energy efficiency and power density. Here we designed a defective MoS 2 nanosheets supported Co single-atom catalyst that accelerated the transformation of S 2− /S x 2− and I − /I 3 − redox couples, hence endow the derived polysulfide–iodide RFB with an initial energy efficiency (EE) of 87.9% and an overpotential of 113 mV with an average EE 80.4% at 20 mA cm −2 and 50% state-of-charge for 50 cycles, and a maximal power density of 95.7 mW cm −2 for an extended cycling life exceeding 850 cycles at 10 mA cm −2 and 10% state-of-charge. In situ experimental and theoretical analyses elucidate that Co single atoms induce the generation of abundant sulfur vacancies in MoS 2 via a phase transition process, which synergistically contributed to the enhanced adsorption of reactants and key reaction intermediates and improved charge transfer, resulting in the enhanced RFB performance.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Zhongxiao Cong,Yuanfang Song,Yuxi Song,Ying Li,Ao Tang
The all-vanadium flow battery (VFB) is a promising candidate for long-duration energy storage. Flow field design is deemed as a critical approach to realize high power density operation for VFBs. However, conventional graphite bipolar plates still face mechanical limitations for practical stack uses, so there is an urgent need to explore alternative design strategies. Herein, a carbon paper based serpentine flow field (SFF) design is proposed for high power density VFB operation, which simultaneously reduces pressure drop and concentration polarization . Finite element analyses firstly compare different SFF designs and reveal effectively reduced pressure drop and promoted flow velocity across the electrode for 100 % SFF design. Subsequently, the 100 % SFF design presents significantly reduced concentration polarization at 200 mA cm −2 and 85 % SOC , which outperforms non-flow field and other SFF designs. Moreover, the full cell experiments demonstrate an enhanced voltage efficiency of 83.6 % at 200 mA cm −2 along with higher discharge capacity. By further coupling 100 % SFF with Bi catalyst, the VFB cell finally proves to deliver a 79 % voltage efficiency at 300 mA cm −2 and stably operate over 1000 cycles, which highlights the great potential of proposed design strategy to realize high power density VFB operations.
研究领域:
能源材料科学
·
电化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Peng Xue,Xiao-Tian Jiang,Mi Qu,Tiqing Zhao,You-Hong Jiang,Yifan Ying,Yong Luo,Dan Wang,Guang-Wen Chu,Jian-Feng Chen,Shi-Gang Sun,Hong-Gang Liao
The nucleation and growth of crystals from solutions are fundamental to materials synthesis and its applications. The mass transfer at micro/nano region in solution will greatly influence the crystal growth process, however, to our knowledge, there is rarely research at this scale due to the technique limit. By using in situ liquid cell transmission electron microscopy (TEM), we observed the crystal growth at flow condition with high resolution in real time. Interestingly, we found a flow induced formation of the solute rich dense liquid phase near surface at ultra-low precursor concentration, which then transformed to nanocrystals. The dendritic crystal growth was accelerated by the dense phase droplet merging and the anisotropic crystal growth was controlled by dense phase shape evolution. Our study deepens the understanding of crystal growth mechanisms, which is crucial to determine reaction dynamics and design hierarchical nanomaterials.
研究领域:
材料科学
·
纳米技术
·
化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）