POLYMER DEGRADATION AND STABILITY
·
2024
·
IF 6.3
Tianyu Liu,Ying Tao,Xiuyuan Ni
Organometallic flame retardants (OFRs) are currently attracting intensive attention. Here, we synthesized a new zinc-chelated OFR, ZnDSi, which was incorporated with phosphorus, silicon, and nitrogen functional moieties. The resulting ZnDSi exhibited strong intumescent properties upon heating and demonstrated high thermal stability, with a decomposition temperature (T d, 5 % ) of 349 °C, making it suitable for the melt-processing of most engineering plastics. Comparative experiments demonstrated that the chelated zinc converted the properties of the resultant OFR, including its intumescence, thermostability and hydrophobicity. The ZnDSi was tested in polyamide 66 (PA66) for the flame-retardant properties. Incorporating 10 wt% of ZnDSi into PA66 attained a limiting oxygen index of 29.1 %, accompanied by the reduction of the peak heat release rate by 35.0 % and total heat release by 28.2 % when compared to the pure PA66 sample, according to the cone calorimeter tests. Mechanism investigation was conducted to probe into the interactions between zinc and organic components through a custom apparatus for pyrolytic gas analysis, and it was found that zinc could reduce the soot release by suppressing the formation of the soot precursors during the pyrolysis. This work contributes to a deeper understanding of how metal elements function in OFR systems, which may conduce to developing OFRs with advanced performance.
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Nature Energy
·
2025
·
IF 60.1
Liu Yuan,Mao Huican,Bai Rui,Weng Suting,Zhang Qiangqiang,Rong Xiaohui,Chen Xiao,Zhang Chu,Han Shuai,Ding Feixiang,Wang Xuefeng,Lu Yaxiang,Zhao Junmei,Wei Fei,Chen Liquan,Hu Yong-Sheng
Side reactions between high-voltage cathodes and electrolytes remain a critical obstacle to the advancement of solid-state batteries—particularly for Na-ion systems—due to the higher Na + /Na redox potential. Despite recent extensive efforts, achieving a long cycle life is still challenging at the 4.2 V cut-off (versus Na + /Na). Here we design a room-temperature isotropic epitaxial growth to achieve a relatively uniform and dense metal–organic framework epilayer on Na 3 V 2 O 2 (PO 4 ) 2 F surfaces. Despite using polyethylene oxide, a typical ether-based solid polymer electrolyte, the cathode with isotropic epilayer exhibits enhanced cycling performance at the 4.2 V cut-off (retaining up to 77.9% of its initial capacity after 1,500 cycles). Combining experimental measurements and theoretical analyses, the key factor governing isotropic epitaxial growth behaviour is explicitly elucidated. Furthermore, we develop a self-designed high-sensitivity characterization method, in situ linear sweep voltammetry coupled with gas chromatography–mass spectrometry, to elucidate the failure mechanism of polyethylene oxide on Na 3 V 2 O 2 (PO 4 ) 2 F surfaces and and to reveal the excellent electrochemical stability of the isotropic epilayer. Interestingly, the universality of this approach has also been validated, highlighting its strong potential as an effective strategy for enabling high-energy-density batteries.
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ADVANCED MATERIALS
·
2018
·Vol. 30
·期 31
·1801021
·
IF 21.95
Xiangling Tian,Hongyu Luo,Rongfei Wei,Chunhui Zhu,Qianyi Guo,Dandan Yang,Fengqiu Wang,Jianfeng Li,Jianrong Qiu
Pulsed lasers operating in the mid-infrared (3–25 µm) are increasingly becoming the light source of choice for a wide range of industrial and scientific applications such as spectroscopy, biomedical research, sensing, imaging, and communication. Up to now, one of the factors limiting the mid-infrared pulsed lasers is the lack of optical switch with a capability of pulse generation, especially for those with wideband response. Here, a semiconductor material of bismuth oxyselenide (Bi 2 O 2 Se) with a facile processibility, constituting an ultrabroadband saturable absorber for the mid-infrared (actually from the near-infrared to mid-infrared: 0.8–5.0 µm) is exhibited. Significantly, it is found that the optical response is associated with a strong nonlinear character, showing picosecond response time and response amplitude up to ≈330.1% at 5.0 µm. Combined with facile processibility and low cost, these solution-processed Bi 2 O 2 Se materials may offer a scalable and printable mid-infrared optical switch to open up the long-sought parameter space which is crucial for the exploitation of compact and high-performance mid-infrared pulsed laser sources.
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ADVANCED MATERIALS
·
2021
·Vol. 33
·期 36
·2102096
·
IF 30.849
Qiang Ma,Shenglong Liao,Yingchao Ma,Yanji Chu,Yapei Wang
Elastomers presenting good elasticity, ductility, and chemical resistance at low temperatures can serve as superior performers for explorations in extremely cold environments. However, no commercially available elastomer to date can comprehensively fulfill those demands. Here, a perfluoropolyether (PFPE)-based network crosslinked by dynamic urethane chemistry is demonstrated, which may satisfy the demands of application in ultracold environments. As the crucial constitute in such a crosslinked network, PFPE provides the elastomer with excellent elasticity at a temperature down to −110 °C and outstanding ductility within the cryogenic temperature range. Importantly, the high proportion of fluorocarbon segment also provides wonderful compatibility to most organic solvents, accounting for the low-swelling characteristics of the elastomer in sealing applications. Furthermore, the dynamic crosslinking feature allows the cured elastomer to be reprocessed like thermoplastic polymers, which affords great promise to recycle and reuse the elastomer after its disposal. Inherently, this elastomer would inspire a worldwide interest in the design of elastic devices that are adaptable to extremely low temperature.
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ADVANCED MATERIALS
·
2025
·
IF 26.8
Xiangyu Sheng,Zhijian Du,Zhiyi Gao,Jianxiong Xu,La Li,Guozhen Shen
The bidirectional modulation of cerebral neurons in the brain possesses enhancement and inhibition of neural activity, which is of great interest in the treatment of motor nerve disorders and emotional disorders, and cognitive defects. However, existing approaches usually rely on electrical/electrochemical stimulations, which show low security by implanting metal probes and unidirectional currents with single modulation. Herein, an implantable in-hydrogel wireless supercapacitor-activated neuron system consisting of the coil, diode bridge circuit, in-hydrogel supercapacitor, and stimulation electrodes is fabricated, which provides a bidirectional and adjustable ion diffusion current to safely and effectively excite and inhibit brain neurons. The designed in-hydrogel supercapacitor exhibits a high storage charge ability of ≈90 times larger than the devices without hydrogel encapsulation, owing to the in situ radical addition mechanism. Moreover, the in-hydrogel electrodes are implanted into the thalamus, amygdala, and prefrontal lobes of the brain to evoke the corresponding changes in potential intensity and frequency through the external chargeable coil and diode bridge circuit, which verifies the potential of the multimodule supercapacitor in amelioration and treatment Parkinson's, severe depression, and Alzheimer's disease.
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高影响因子
Science Robotics
·
2020
·Vol. 5
·期 48
·
IF 18.684
Xiong Yang,Wanfeng Shang,Haojian Lu,Yanting Liu,Liu Yang,Rong Tan,Xinyu Wu,Yajing Shen
Millirobots that can adapt to unstructured environments, operate in confined spaces, and interact with a diverse range of objects would be desirable for exploration and biomedical applications. The continued development of millirobots, however, requires simple and scalable fabrication techniques. Here, we propose a minimalist approach to construct millirobots by coating inanimate objects with a composited agglutinate magnetic spray. Our approach enables a variety of one-dimensional (1D), 2D, or 3D objects to be covered with a thin magnetically drivable film (~100 to 250 micrometers in thickness). The film is thin enough to preserve the original size, morphology, and structure of the objects while providing actuation of up to hundreds of times its own weight. Under the actuation of a magnetic field, our millirobots are able to demonstrate a range of locomotive abilities: crawling, walking, and rolling. Moreover, we can reprogram and disintegrate the magnetic film on our millirobots on demand. We leverage these abilities to demonstrate biomedical applications, including catheter navigation and drug delivery.
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ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Xinyue Kang,Jiatian Song,Jiuzhou Liu,Siwei Cao,Zhengmeng Lin,Hongyu Jiang,Yiqing Yang,Xiangran Cheng,Yulu Ai,Xuemei Sun,Kaiwen Zeng,Zhengfeng Zhu,Huisheng Peng
Fiber gel dye-sensitized solar cells (FGDSCs) are recognized as an effective solution for high-performance, durable and safe wearable power supply. However, poor and unstable interfaces between fiber electrodes and gel electrolytes are bottleneck problems that have restricted the photovoltaic performances of FGDSCs and their stabilities during deformations. Here, an FGDSC with stable interlaced interfaces is designed by incorporating polymerized gel electrolyte into the aligned channels in fiber electrodes and the gaps between photoanode and counter electrode in situ. The interlaced structure of gel electrolyte in FGDSC improves the interfacial stability and provided stable channels for rapid ion diffusions, offering efficient charge transports at interfaces. The resulting FGDSC thus produced a high power conversion efficiency of 7.95%, and it is further maintained by over 90% after bending for 5000 cycles. These FGDSCs can be integrated with fiber batteries as a self-charging power system, demonstrating an effective power solution for wearables.
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Nano Energy
·
2023
·
IF 17.6
Lin Peng,Zhong Lin Wang,Xia Cao,Liqun Zhang
The asymmetric and anisotropic conductive properties of Janus membranes is drawing considerable attention for the development of self-powered wearable electronics because it is a potential platform for endowing sustainable power sources such as triboelectric nanogenerator with high performance and multifunctionality . Herein, we prepared ultrathin electrically anisotropic Janus membranes by mixing liquid metal (LM) nanoparticles with a hydroxyethyl cellulose (HEC) suspension. The density deposited LM-HEC Janus film shows both excellent insulating properties on the HEC side and directly writable and conductive path properties on the LM side. A folding structured triboelectric nanogenerator (FS-TENG) was thus developed based on the insulating property of the HEC side for Morse code encrypted communication as well as Braille typewriters. Besides, a tactile sensor with visible light feedback functions was constructed using the functional circuit that was built on the conducting LM side, which promotes the design of wearable energy-autonomous sensing system by intrinsically integrating the self-power function with visual sensing parts. The simple preparation method applied in this study shed new light on the design and fabrication of flexible electronics that are based on Janus films.
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RSC Advances
·
2024
·Vol. 14
·期 49
·36181-36192
·
IF 3.9
Bo Zhang,Chaoqi Li,Shasha Liu,Lixuan Zhuang,Weiqi Zhang,Limei Huang,Zhenzhen Jia,Dongdong Chen,Xiang Li
A CaMnO3/g-C3N4 heterostructure, demonstrating promising photocatalytic performance for tetracycline (TC), was successfully synthesized using a straightforward calcination approach in this study. A series of characterization methods were employed to assess the physicochemical properties and visible-light responsiveness of the synthesized photocatalysts. The photocatalytic degradation rates of TC for the three prepared samples were evaluated. The results indicate that the CaMnO3/g-C3N4 composite exhibits the highest photocatalytic activity under visible-light irradiation, surpassing that of the individual components. Specifically, the degradation rate of CaMnO3/g-C3N4 is 0.031 min−1, which is 2.07 and 2.82 times greater than that of the pristine g-C3N4 and CaMnO3, respectively. Our findings highlight the significant potential of eco-friendly perovskites in developing visible-light-activated g-C3N4-based heterostructures for practical photocatalytic applications.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Jiale Li,Weigang Gu,Dajun Wu,Xuekun Hong,Shi Tao,Bin Qian,Shaohui Xu,Paul K. Chu
The oxygen evolution reaction (OER) is a four-electron-proton reaction requiring a large overpotential. In order to improve the electrocatalytic activity of iron-based OER electrocatalysts, the overpotential must be reduced in order to improve the efficiency and cost-effectiveness. Herein, FeCo LDH, FeCo 2 O 4 , RuO 2 /FeCo 2 O 4 , and Ru/CoFe LDH are synthesized on carbon cloth (CC) by a simple hydrothermal and annealing technique. The materials are characterized systematically, and their electrocatalytic OER properties are evaluated in detail. RuO 2 /FeCo 2 O 4 delivers superior OER performance in 1 M KOH, such as a low onset potential 1.55 V at a current density of 10 mA/cm −2 , a Tafel slope of 85.2 mV/dec −1 , as well as robust stability. The Mott-Schottky analysis reveals that the built-in electric field accelerates charge transfer and enhances the catalytic activity of RuO 2 /FeCo 2 O 4 .
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Materials Today Communications
·
2024
·
IF 3.7
Zhihua Feng,Bo Tang,Kexin Liu,Qingqing Hou,Zhangting Dang,Cui Yang,Xiufu Hua,Qiushuo Yu,Lingling Wang,Renbo Wei
The chemical transformation of CO 2 into high-value-added products is not only favourable to environmental preservation, but also promising for economy. Developing novel and practical catalysts play a critical role in facilitating conversion of CO 2 and the synthesis of high value-added chemicals. Herein, we present the fabrication of biphenyl-typed copper phthalocyanine polymer (BPh-CuPc) from 4,4’-bis(3,4-dicyanophenoxy)biphenyl via a one-pot synthesis procedure, and application of it as a promising catalyst for CO 2 conversion into cyclocarbonate. FTIR, XPS, UV–vis, TGA and SEM measurements confirm the successful fabrication of BPh-CuPc. Attributing to the existence of copper ions which can act as a Lewis acid to activate epoxide, and phthalocyanine rings that is positive for CO 2 absorption, within the chemical framework of BPh-CuPc, it exhibits excellent catalytic activity for CO 2 conversion into cyclic carbonates under mild conditions when combined with tetrabutylammonium iodide (TBAI). As a result, a 98 % yield and 99 % selectivity are obtained for the BPh-CuPc/TBAI system in CO 2 /propylene oxide conversion under condition of 90 °C, 8 h and 2.0 MPa. The obtained high yield and selectivity, as well as remarkable stability and versatility, validate the promising application of BPh-CuPc as a CO 2 conversion catalyst. Synopsis Attributing to the existence of copper ions and phthalocyanine rings within the chemical framework, BPh-CuPc exhibits excellent catalytic activity for CO 2 conversion into cyclic carbonates under mild conditions.
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JOURNAL OF TEXTURE STUDIES
·
2025
·Vol. 56
·期 5
·e70040
·
IF 2.5
Jiale Kuang,Xiaojun Sun,Yan Zhang,Yanfeng Li,Shikun Liu,Shixin Yu,Jingjing Liu
Astringency is a complex oral sensation characterized by dryness and constriction in the mouth. It is typically induced by polyphenol-rich foods and beverages such as wine and tea. The quantitative assessment of astringency intensity has become a prominent research focus in the food science field. In this study, an in vitro oral tribological method was developed based on a soft–hard friction interface. An oral-like sensory structure was constructed using biomimetic materials to replicate tongue–palate contact. The frictional behavior carried out in this structure is similar to that of the palate-tongue friction contact in the oral cavity. Thus, the structure allows for the detection of the effect of changes in the nature of food in the oral cavity on the tongue and the palate, which can be quantified by the coefficient of friction. Porcine gastric mucin (PGM), which shares functional similarities with salivary proteins, was employed as a model sensory material. This allowed the device to capture the interaction mechanisms between astringent compounds (e.g., tannins) and salivary proteins. A calibration curve was established by fitting friction coefficient data across a range of tannin concentrations. Subsequently, commercial wine samples were tested. The tribological system detected changes at the mucin–wine soft–hard interface, and the measured friction coefficient served as a quantitative indicator of astringency intensity. This study provides a feasible and reproducible experimental approach for the quantification of food astringency.
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