SOLAR ENERGY MATERIALS AND SOLAR CELLS
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2024
·
IF 6.3
Xian Qin,Hui Liu,Jinjia Wei
The reversible reaction of calcium oxide (CaO) carbonation/calcination is a viable energy storage technology that can be used in concentrated solar power plants. However, the use of pure CaO material is limited by the low Tammann temperature of CaCO 3 , which leads to incomplete reaction in the carbonation/calcination cycle process and particle agglomeration and sintering after multiple cycles. These factors affect CO 2 mass transfer and react with deep CaO, resulting in decreased energy storage performance with the increase of number of cycles, which seriously hinders the practical application of the material. In this study, MnCl 2 was employed as a stabilizer to overcome the poor cyclic stability of CaO by using a simple wet impregnation method. Mn 2+ was introduced into the CaO precursor through impregnation and calcination processes, resulting in the formation of Ca 2 MnO 4 . This compound acted as a skeleton to support the CaO structure. Additionally, some of the Cl − reacted with Ca 2+ to produce CaCl 2 , which melted during carbonation and facilitated CO 2 mass transfer. It is worth noting that when the concentration of MnCl 2 is 0.05M, the loaded samples exhibit a high energy storage density of 1710 kJ/kg. Moreover, after 50 cycles of carbonation/calcination, the performance only decreases by 5 %, which is 3.7 times that of the CaO materials of the same period. The proposed CA-MnCl 2 -0.05 material could be applied in concentrated solar power plants for energy storage.
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Journal of Materials Chemistry B
·
2024
·
IF 6.1
Xin Chen,Wenhao Liu,Chi Su,Jianyang Shan,Xiang Li,Yimin Chai,Yaling Yu,Gen Wen
Articular cartilage defects can lead to pain and even disability in patients and have significant socioeconomic loss. Repairing articular cartilage defects remains a long-term challenge in medicine owing to the limited ability of cartilage to regenerate. At present, the treatment methods adopted in clinical practice have many limitations, thereby necessitating the rapid development of biomaterials. Among them, decellularized biomaterials have been particularly prominent, with numerous breakthroughs in research progress and translational applications. Although many studies show that decellularized cartilage biomaterials promote tissue regeneration, any differences in cellular morphology, dynamics, and functionality among various biomaterials upon comparison have not been reported. In this study, we prepared cartilage-derived extracellular matrix (cdECM) biomaterials with different bioactive contents and various physical properties to compare their effects on the morphology, dynamics and functionality of chondrocytes. This cellular multimodal analysis of the characteristics of cdECM biomaterials provided a theoretical basis for understanding the interactions between biomaterials and cells, thus laying an experimental foundation for the translation and application of decellularized cartilage biomaterials in the treatment of cartilage defects.
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ADVANCED FUNCTIONAL MATERIALS
·
2020
·Vol. 31
·期 5
·2008515
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IF 16.836
Lili Sun,Yifan Ma,Haoyi Niu,Yutong Liu,Yuan Yuan,Changsheng Liu
Due to the limited ability for perfusion, traditional intramembranous ossification (IMO) often fails to recapitulate the natural regeneration process of most long bones and craniofacial bones. Alternatively, endochondral ossification (ECO) strategy has emerged and has been evidenced to circumvent the drawbacks in the routine application of IMO. Here, an injectable, poly(glycerol sebacate)- co -poly (ethylene glycol)/polyacrylic acid (PEGS/PAA) hydrogels are successfully developed to induce a hypoxia-mimicking environment and subsequently recapitulate ECO via in situ iron chelation. With the incorporation of PAA, these hydrogels present remarkable viscoelasticity and high efficacy of iron ion-chelating after injection, giving rise to the activation of HIF-1α signaling pathway and suppression of inflammatory responses, and thereby improving chondrogenic differentiation in the early stage and facilitating vascularization in the later stage, which consequently trigger typical ECO. More importantly, through sustained and stable expression of HIF-1α regulated by PEGS/PAA hydrogels throughout the regeneration, a harmonious chondrogenic/osteogenic balance can be struck and thereby accelerating the progress of ECO compared to the PEGS. The findings provide an efficient strategy to achieve in situ ECO via biomaterial-based iron ion-chelating and ensuing hypoxia-mimicking, representing a novel and promising concept for future application in bone regeneration.
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JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY
·
2024
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IF 3.1
Guanru Chen,Fengjian Chu,Shuheng Zhang,Wangyu Li,Shiwen Zhou,Wei Wei,Weiwei Chen,Xiaozhi Wang,Lei Yue,Hongru Feng,Yanli Cui,Yuanjiang Pan
C–H bond ortho-substitution reaction has always been a significant and challenging topic in organic chemistry. We proposed a synthesis method based on microwave plasma torches. High-resolution mass spectrometry was used to monitor rapid reaction products. 2-Alkylbenzimidazole can be formed through the reaction of phenylnitrenium ion and nitriles on a millisecond scale. This reaction can achieve the one-step formation of benzimidazoles from benzene ring single-substituted compounds without the addition of external oxidants or catalysts. A similar C–H bond activation reaction can be accomplished with ketones. Meanwhile, the microwave plasma reactor was modified, and the resulting 2-methylbenzimidazole was successfully collected, indicating the device has good application potential in organic reactions such as C–H bond activation reaction.
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Machines
·
2024
·Vol. 12
·期 11
·817
·
IF 2.1
Xinqi Zou,Zhenghao Ge,Chaobao Wang,Yuyang Xi
The low viscosity of water-lubricated films compromises their load-bearing capacity, posing challenges for practical application. Enhancing the lubrication stability of these films under load is critical for the successful use of seawater-lubricated bearings in engineering. Polydopamine (PDA) shows great potential to address this issue due to its strong bio-inspired adhesion and hydration lubrication properties. Thus, PDA nanoparticles and seawater suspensions were synthesized to promote adhesive lubricating film formation under dynamic friction. The lubrication properties of PDA suspensions were evaluated on Cu ball and ultra-high molecular weight polyethylene (UHMWPE) tribo-pairs, with a detailed comparison to seawater. The results show PDA nanoparticles provide excellent adhesion and lubrication, enhancing the formation of lubricating films during friction with seawater. Under identical conditions, PDA suspensions demonstrated the lowest friction coefficient and minimal wear. At 3 N, friction decreased by 56% and wear by 47% compared to distilled water. These findings suggest a novel strategy for using PDA as a lubricant in seawater for engineering applications.
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Materials Research Express
·
2025
·Vol. 12
·期 1
·015304
·
IF 2.2
Shibo Ren,Jianlin Xu,Lei Niu,Penghui Yang
In this study, the surface flame retardancy of polycarbonate (PC) was improved and the impact of flame retardants on the substrate were minimized by pre-mixing Al2O3 particles with dichloromethane, an infiltration promoter, to form a suspension, and then treating PC with the suspension to form an Al2O3 infiltration layer. For this layer, its structure and composition were characterized, its flame retardancy was evaluated, and its flame retardancy mechanism was investigated. The characterization results confirmed that an Al2O3 infiltration layer was successfully prepared on the PC surface under the aid of dichloromethane and that the involvement of dichloromethane induced certain microscopic pores and voids in the PC, with some dichloromethane remaining within the surface infiltration layer. The surface Al2O3 infiltration layer mainly served as a condensed-phase flame retardant. The infiltration layer prepared using a suspension with a dichloromethane-to-Al2O3 mass ratio of 24:1 not only exhibited a good overall performance but also achieved the best improvement in the PC flame retardancy, such as an increase in the vertical burning rating from HB to V-0, as well as the LOI increased from 24 to 31.3, and a 35% reduction in the peak heat release rate compared to those of pure PC.
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Journal of Bioresources and Bioproducts
·
2024
·
IF 20.2
Yuanlong Guo,Pengcheng Liu,Lei Deng,Changwei Lui,Michael North,Gang Hu,Qitian Huang,Zongbao Kent Zhao,Haibo Xie
Phenolation is one of the effective strategies to synthesize lignin-based polyphenols, improve lignin's properties, and extend its value-added applications in biological, medicinal and cosmetic fields. Herein, by taking the structural feature advantage of lignin, an effective and green strategy was developed to molecularly engineer lignin into a robust lignin-3-(2-hydroxyphenyl)propionate ester (LPPE) derivative via a transesterification reaction between 3,4-dihydrocoumarin (DHC) and the aliphatic hydroxyls in lignin under organocatalysis. The strategy is optimized and the novel derivative was systematically characterized by 1 H, 13 C and 31 P nuclear magnetic resonance (NMR) and Fourier transform infrared (FT-IR) spectroscopy. The findings indicated that the successful introduction of 3-(2-hydroxyphenyl)propionate groups using a OH groups/DHC/organic base molar ratio of 1꞉1꞉0.3 at 120 °C for 6 h increased the content of phenolic hydroxyl groups from 1.793 1 to 3.017 9 mmol/g, and the LPPE exhibited excellent ultraviolet-absorbing and antioxidant performance with up to 90% free radical scavenging activity within 20 min using 5 mg/mL of LPPE. In addition, good biocompatibility and a high Sun protection factor (SPF) value of 40.9 were achieved at 5% ( w ) dosage of LPPE in the cream, indicating its significant application potential in sunscreen.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Jun Hu,Jiangping Guo,Junyan Zhao,Zixun Chen,Mulenga Kalulu,Gaojian Chen,Guodong Fu
The present zwitterionic hydrogel-based wearable sensor exhibits various limitations, such as limited degradation capacity, unavoidable toxicity resulting from initiators, and poor mechanical properties that cannot satisfy practical demands. Herein, we present an initiator and crosslinker-free approach to prepare polyethylene glycol (PEG)@poly[2-(methacryloyloxy)ethyl] dimethyl-(3-sulfopropyl) (PSBMA) interpenetrating polymer network (IPN) hydrogels that are self-polymerized via sunlight-induced and non-covalent crosslinking through electrostatic interaction and hydrogen bonding among polymer chains. The PEG@PSBMA IPN hydrogel possesses tissue-like softness, superior stretchability (∼2344.6% elongation), enhanced fracture strength (∼39.5 kPa), excellent biocompatibility, antibacterial property, reliable adhesion, and ionic conductivity. Furthermore, the sensor based on the IPN hydrogel demonstrates good sensitivity and cyclic stability, enabling effective real-time monitoring of human body activities. Moreover, it is worth noting that the excellent degradability in the saline solution within 8 h makes the prepared hydrogel-based wearable sensor free from the electronic device contamination. We believe that the proposed strategy for preparing physical zwitterionic hydrogels will pave the way for fabricating eco-friendly wearable devices.
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PROCEEDINGS OF THE COMBUSTION INSTITUTE
·
2024
·
IF 5.3
Yuwen Deng,Zaili Xiong,Jijun Guo,Bingzhi Liu,Meirong Zeng,Zhandong Wang,Zhongyue Zhou,Wenhao Yuan,Fei Qi
Elucidating the oxidation chemistry of polycyclic aromatic hydrocarbons (PAHs) aids in understanding the degradation reaction processes of PAHs, as well as their competitive roles in PAH growth. In this work, ozone-assisted oxidation of indene , the smallest prototype PAH molecule, was investigated in an atmospheric jet stirred reactor at 400–550 K. Ab initio quantum chemistry calculations were conducted to characterize the oxidation kinetics of indene and interpret the experimental observations. Fingerprint oxidation products including 2-(2-oxoethyl) benzoic acid, 2-(formylmethyl) benzaldehyde , 1,2-indanedione and 1-indanone were identified by synchrotron vacuum ultraviolet photoionization mass spectrometry . The initial C 9 H 8 O 3 adduct resulting from O 3 -addition to indene exhibits high instability and is primarily detected as 2-(2-oxoethyl)benzoic acid following ozonolysis reactions. Minor amounts of vinylhydroperoxide were also observed as isomeric products of the C 9 H 8 O 3 adduct. Theoretical calculations indicate that indene ozonolysis is highly structure-dependent, where the conformation of the C 9 H 8 O 3 adduct determines the configuration of the resulting Criegee intermediates (CI). The distinctive reaction pathways introduced by the bifunctionalized characteristics of indene-derived large CIs are emphasized in this study. syn -Configuration CI features more conversion pathways compared to anti -CI due to the interaction between CI functionality and the neighboring aldehyde group, among which the bicyclic ring-closure reaction yielding secondary ozonide is most favored. The dioxirane intermediates generated from anti -CIs can undergo the Crossed Acid-forming channel to yield the target acid products, which provides an alternative way for dioxirane conversion. Further theoretical analyses demonstrate that ozonolysis is not the exclusive mechanism for indene oxidation under O 3 -assisted conditions. Instead, it is accompanied by low-temperature reactions initiated by OH/O 2 , leading to key products such as 2-(formylmethyl) benzaldehyde and 1-indanone. The present work aims to unravel the elusive chemistry involved in the O 3 -initiated oxidation of indene, providing new insights into the distinctive kinetics introduced by large bifunctionalized CIs in the ozonolysis of structurally similar PAHs.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 20
·1-11
·
IF 2.8
Wang Yunjie,Liang Fangan,Zou Zhengguang,Zhang Shuchao,Jia Shengkun,Nong Jinxia,Zheng Rong,Song Lijie
Among the cathode materials for lithium-ion batteries (LIBs), vanadium oxides have received extensive attention from researchers due to their abundant reserves and high theoretical specific capacity. Nevertheless, its low electronic conductivity and poor structural stability lead to its poor electrochemical performance. Herein, the V 2 O 5 layered nanofibers prepared by electrostatic spinning technique combined with annealing processes. When the calcination temperature was set to 450 °C, the obtained V 2 O 5 layered nanofiber material (AM450-V 2 O 5 ) had a uniformly dispersed morphology, which conferred more lithium ion insertion sites and thus accelerated lithium ion insertion/(de)insertion. Based on this, the AM450-V 2 O 5 electrode exhibits a high initial discharge specific capacity (250.7 mAh/g at 0.1 A/g) and excellent cycling stability (82% cycle retention at 1 A/g after 150 cycles). These results indicate that the V 2 O 5 layered nanofibers are highly promising as long-life, high-rate cathode materials for next-generation LIBs.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Zhiqi Zhang,Zhong Tao,Yi Zhang,Lei Wu,Zhiman Zhao,Haixiang Xu
Phosphogypsum (PG), a solid waste produced from the wet process of phosphoric acid production, primarily contains impurities such as phosphates. Understanding how phosphates exist is crucial for the purification and resource utilization of PG. This study employs Energy Dispersive X-ray Spectroscopy (EDS), Fourier Transform Infrared Spectrometer (FTIR), X-ray diffraction (XRD), and Density Functional Theory (DFT) simulations to investigate the forms of phosphates within the CaSO 4 · 2 H 2 O lattice. The research findings reveal that the density of phosphorus (P) increases in regions where the density of sulfur (S) decreases. Higher phosphorus doping enhances the interplanar spacing and unit cell volume of CaSO 4 · 2 H 2 O crystals. Upon comparison, it is evident that the energy required for HPO 4 2- substitution of SO 4 2- is the lowest, suggesting that phosphates are most likely to enter the CaSO 4 · 2 H 2 O lattice in the form of HPO 4 2- . Furthermore, HPO 4 2- substitution in CaSO 4 · 2 H 2 O is likely localized, with no inclination towards intralayer substitution. In instances where phosphate replaces SO 4 2- , the electronic distribution near phosphorus atoms mirrors that of sulfur atoms. This study provides a comprehensive, atomic-level elucidation of the presence of phosphates in gypsum, significantly contributing to the rational utilization of solid waste.
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Small
·
2025
·
IF 12.1
Meiting Fu,Kai Jin,Yue Zhang,Richmond Polley,Ruoyu Zhang,Shigang Yang,Debiao Liu
With rising interest in various offshore equipment, bridges, and marine engineering, it is necessary to develop an epoxy resin adhesive that can cure quickly under seawater and has high bonding performance. In this paper, through mimicking mussel adhesive proteins, a biomimetic epoxy resin is designed and prepared for seawater adhesion. A mussel dopamine-like structure with cashew phenol and catechol as the main structure is prepared by the Mannich reaction, and the amino acids in mussel adhesive protein are simulated by the addition of decamethylene diamine. The results show that the adhesive has higher seawater bonding strength (17.65 MPa) and tensile strength (30.31 MPa) under the condition of seawater solidification. The cross-section morphology of the adhesive is still a typical ductile fracture due to the adhesive retaining the toughened properties of the cashew phenol structure, while the catechol structure provides a stronger bonding ability. The apparent activation energy is 45.22 kJ mol −1 indicating in a high curing activity. The ions in seawater can participate in the bonding process of the adhesive, and non-covalent bonds can be formed in the process. The construction strategy that mimics the mussel adhesive protein structure can also be used to design other seawater adhesives.
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