SURFACE & COATINGS TECHNOLOGY
·
2024
·
IF 5.3
Xinzi Zhong,Liyun Cao,Tian Ji,Jianfeng Huang,Yijun Liu,Xuetao Shen,Yong Zhao,Zhiwen Cheng,Ting Liu
Antioxidant SiO 2 coating exhibits low cost and great compatibility with existing uses, but is strongly limited by its poor fluidity and high oxygen permeability from 973 K to 1273 K. Therefore, the hierarchical-design Glass/MoSi 2 -B 2 O 3 @SiO 2 -SiC coating was fabricated on C/C composite by a simple embedding method, and followed by a hot dip process. This composite yielded excellent combination of long-term antioxidant abilities and thermal shock resistances. As oxidized at 973 K for 1500 h, its mass loss was 0.35 %, and only 0.66 % at 1073 K for 2600 h. After thermal shocks 270 times, the weight loss was only 0.56 %. Interestingly, the Glass/MoSi 2 coating acted as a self-healing encapsulation shelter against oxygen, whilst the B 2 O 3 @SiO 2 layer yielded stable healing effect. The B 2 O 3 @SiO 2 microcapsule facilitated the activation of B 2 O 3 , SiO 2 phases, and borosilicate glass sequentially as temperature rose, leveraging their unique advantages in defect healing. Through the synergistic effects of interface encapsulation and defect self-healing, the oxygen kept osmotic diffusion. This study underscores the significance of hierarchical designs in coatings, facilitating structure optimizations and enhancing antioxidant capabilities at multiple levels.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Jiangping Jing,Zhuoyuan Chen,Chang Feng,Mengmeng Sun,Jian Hou
Photoelectrochemical cathodic protection is emerging as a green and environmental method to protect metals against corrosion. Graphitic carbon nitride (g-C 3 N 4 ) shows great application potential in this area because of its high efficiency, high stability and low cost. However, the pristine g-C 3 N 4 shows amphoteric properties, resulting in its failure in providing photoelectrochemical cathodic protection for the coupled metal in NaCl solution. In this work, a K&I co-doping technique was performed to modulate the band structure of g-C 3 N 4 , and an n-type g-C 3 N 4 (n-C 3 N 4 ) was obtained. The changes in the molecular structure were studied by SEM, HRTEM , XRD , EDS, XPS and FT-IR technologies. The n-type semiconductor characteristics were verified by the photoinduced i-V curves, SKP potential distributions and pH drift techniques. The n-C 3 N 4 can generate positive photocurrent in the whole investigated potential range, making it able to provide photoelectrochemical cathodic protection for the coupled 316L stainless steel in NaCl solution. This work is very helpful for promoting the application of g-C 3 N 4 in the fields of the photoelectric conversion and the photoelectrochemical cathodic protection.
研究领域:
材料科学
·
腐蚀与防护
·
电化学
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高影响因子
WATER RESEARCH
·
2017
·
IF 6.942
Dehua Xia,Yan Li,Guocheng Huang,Ran Yin,Taicheng An,Guiying Li,Huijun Zhao,Anhuai Lu,Po Keung Wong
This study introduces natural occurring magnetic pyrrhotite (NP) as an environmentally friendly, easy available, and cost-effective alternative catalyst to activate persulfate (PS) of controlling microbial water contaminants. The E. coli K-12 inactivation kinetics observed in batch experiments was well described with first-order reaction. The optimum inactivation rate ( k = 0.47 log/min) attained at a NP dose of 1 g/L and a PS dose of 1 mM, corresponding to total inactivation of 7 log 10 cfu/mL cells within 15 min. Measured k increased > 2-fold when temperature increased from 20 to 50 °C; and > 4-fold when pH decreased from 9 to 3. Aerobic conditions were more beneficial to cell inactivation than anaerobic conditions due to more reactive oxygen species (ROS) generated. ROS responsible for the inactivation were identified to be SO 4 − > OH > H 2 O 2 based on a positive scavenging test and in situ ROS determination. In situ characterization suggested that PS effectively bind to NP surface was likely to form charge transfer complex (≡Fe(II)⋯O 3 SO OSO 3 - ), which mediated ROS generation and E. coli K-12 oxidation. The increased cell-envelope lesions consequently aggravated intracellular protein depletion and genome damage to cause definite bacterial death. The NP still maintained good physiochemical structure and stable activity even after 4 cycle. Moreover, NP/PS system also exhibited good E. coli K-12 inactivation efficiency in authentic water matrices like surface water and effluents of secondary wastewater.
研究领域:
环境科学
·
微生物学
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PubMed
高影响因子
Frontiers of Chemical Science and Engineering
·
2022
·Vol. 16
·期 6
·996-1002
·
IF 4.803
Zhang Changgeng,Zhang Qi
Recent advances in novel electroactive devices have placed new requirements on material development. High-performance dielectric elastomers with good mechanical stretchability and high dielectric constant are under high demand. However, the current strategy for fabricating these materials suffers from high cost or low thermal stability, which greatly hinders large-scale industrial production. Herein, we have successfully developed a novel strategy for improving the dielectric constant of polymeric elastomers via deep eutectic solvent inclusion by taking advantage of the low cost, convenient and environmentally benign synthesis process and high ionic conductivity from deep eutectic solvents. The as-prepared composite elastomers showed good stretchability and a greatly enhanced dielectric constant with a negligible increase in dielectric dissipation. Moreover, we have proven the universality of our strategy by using different types of deep eutectic solvents. It is believed that low-cost, easy-synthesis and environmentally friendly deep eutectic solvents including composite elastomers are highly suitable for large-scale industrial production and can greatly broaden the application fields of dielectric elastomers.
研究领域:
材料科学
·
电活性设备
·
聚合物科学
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2018
·Vol. 28
·期 29
·1801989
·
IF 13.325
Lei Liu,Yu Chen,Yihao Xie,Peng Tao,Qinyi Li,Chenglin Yan
Carbon-based materials are considered to be one of the most promising materials for negative electrodes of the future, because of their good chemical stability, high electrical conductivity, and environmental benignity. However, to date, the underlying principles of K-ion storage in carbonaceous anodes remain elusive, which greatly hinders the development of such a category of anodes. Herein, the ultrastable K-ion storage of carbonaceous anode through systematic analyses, including comprehensive electrochemical characterizations, kinetics calculations, and structural/compositional evolution mechanism studies, is theoretically elucidated and experimentally verified. Specifically, it is found that the uniquely envelope-like nitrogen-doped carbon nanosheets with high pseudocapacitive could bring ultrastable storage of potassium ions, delivering a high initial reversible capacity of 367 mAh g −1 at a current density of 50 mA g −1 and retain 70.5 and 75.6% at current densities of 500 and 1000 mA g −1 after 1000th cycle, respectively. This study could enlighten researchers on further progress in the field of carbonaceous K-ion battery negative electrode with a long cycle life.
研究领域:
材料科学
·
电化学
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CELL CALCIUM
·
2026
·
IF 4
Zi-Yang Huang,Yu-Yun Zhou,Xin-Ni Sun,Yi-Ran Ye,Fei-Fei Huang,Jie Sheng,Dan-Yang Zou,Ting-Ting Tang,Zi-Ying Yang,Tong-Zhen Weng,Xin-Rui Ling-Hu,Wai Hou Tang,Yun-Xin Zhu,Lei Chen,Su Qu,Wen-Liang Zhou,Yi-Lin Zhang
The epididymis establishes a unique hyper-potassium luminal microenvironment essential for sperm maturation and storage, which is largely orchestrated by epididymal epithelial ion transport. Although the transient receptor potential melastatin 8 (TRPM8) is broadly expressed across various organ systems, its physiological role in male reproduction has remained largely unexplored. This study demonstrated that TRPM8 was predominantly expressed in rat epididymal epithelial cells. Activation of TRPM8 by either the exogenous agonist WS-12 or the endogenous hormone testosterone triggered a decrease in short-circuit current ( I SC ) response in primary cultured rat epididymal epithelial cells. This I SC response was suppressed by removal of extracellular K + or by pharmacological inhibition of Ca 2+ -activated potassium channels (K Ca ), Na + -K + ATPase or the Na + -K + -Cl − cotransporter, indicating that TRPM8 mediated transepithelial K + secretion in a Ca 2+ -dependent manner. Consistently, TRPM8 activation increased intracellular Ca 2+ concentration in primary rat epididymal epithelial cells, which could be abolished by the removal of extracellular Ca 2+ . An in vivo study showed functional TRPM8 deficiency disrupted the luminal hyper-potassium microenvironment in rat epididymis. Moreover, impaired sperm motility and reduced male fertility were observed in TRPM8-deficient rats, which could be rescued by restoring luminal hyper-potassium microenvironment through K Ca activation. Overall, this study elucidates a crucial role for TRPM8 in establishing the epididymal hyper-potassium microenvironment, offering valuable insights into the physiological function of TRPM8 in male reproductive health and disease.
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高影响因子
Laser & Photonics Reviews
·
2026
·
IF 9.7
Yan Xiang,Zhixiong Xu,Tongcheng Wei,Miaomiao Ma,Nan Yang,Pengpeng Dai,Meng Zhang,Xintong Zhang
Wide-temperature color-stable luminescence is a critical requirement for high-performance phosphor-converted light-emitting diodes (pc-LEDs). However, broadband emitters, particularly Bi 3+ -activated phosphors, universally suffer from thermally induced spectral drift. This behavior originates from their intrinsic sensitivity to temperature-dependent crystal-field reconfiguration and electron–phonon coupling (EPC) under thermal cycling conditions. To overcome the above bottleneck, we propose a lattice engineering strategy grounded in an intrinsically low-thermal-expansion host, using Gd 2 Zr 2 O 7 (GZO) as a model system. Benefiting from its ultralow coefficient of thermal expansion (6.56 × 10 −6 K −1 ), the GZO host robustly suppresses lattice distortion and markedly attenuates EPC effects over an ultra-wide temperature range (6–423 K). Such unique structural characteristics decouple Bi 3+ emission from thermally driven lattice dynamics, endowing the phosphor with intrinsic thermal spectral stability. The optimized composition, Gd 2 Zr 2 O 7 : 0.03Bi 3+ , demonstrates outstanding chromatic stability across the entire temperature range, with negligible average CIE coordinate deviations of Δ Δ $\Delta $ x = 0.00987 and Δ Δ $\Delta $ y = 0.01205. Furthermore, it exhibits unique excitation- and temperature-responsive luminescence, enabling flexible dual-mode spectral modulation. This study transforms the design route of wide-temperature color-stable phosphors from passive external heat dissipation to active intrinsic low-expansion host engineering and provides a general strategy for exploiting anti-color-drift broadband luminescent materials.
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ACS Applied Polymer Materials
·
2025
·
IF 4.7
Yehui Liang,Xiaoying Li,Guanxiang Zhong,Ruoyu Chen,Wenyang Kou,Kai Wang,Hetao Chu
Polyimide films have been widely used in the fields of microelectronics and aerospace due to their exceptional overall performance. However, achieving simultaneous improvements in the dielectric, toughness, and mechanical properties of PI films has been a critical and challenging problem. Herein, pyromellitic dianhydride and 4,4′-oxydianiline were used as reactive monomers to prepare polyamic acid porous microspheres (PM) (PAA–PM) and polyimide PM (PI–PM) using a multiple emulsion method. The results show that PAA–PM has high transverse relaxation times (T2) in the precursor solution, which enables high additive capacity, and its homogeneous dispersion in the precursor solution benefits from the hydrogen bond interactions between the carboxyl groups of PAA–PM and the molecular chains of the precursor. Due to the formation of a microcross-linking bridged structure between PAA–PM and the precursor after thermal imidization, the toughness of the final composite film was increased by 332.6% compared to pure PI film, while the tensile strength and elongation at break were improved by 24.5% and 71.1%, respectively. In addition, the dielectric constant decreased by 23.1% (from 3.63 to 2.79 at 1 MHz) and the incorporation of microspheres has almost no effect on thermal stability of the film (T5% of 559.46 °C). The PM effectively mitigated the deterioration of dielectric properties caused by the reduction of the free volume fraction during the thermal stretching of the films.
研究领域:
材料科学
·
微电子学
·
航空航天工程
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高影响因子
BIOSENSORS & BIOELECTRONICS
·
2019
·
IF 9.518
Ting Ye,Heng Gao,Qingqing Zhang,Chenxiao Yan,Yali Yu,Yifan Fei,Longlong Gao,Xiaoshun Zhou,Yong Shao
Due to the high abundance of K + in environments and K + -induced high stability of G-quadruplex (G4), developing a selective G4-based fluorescent sensor for other metal ions with K + tolerance is a great challenge. Herein, we found that even in the presence of 15000-fold excess of K + , Ba 2+ exhibits a highly specific binding with a human telomeric G4 (htG4) in comparison with other G4-binding metal ions such as Pb 2+ and Sr 2+ . This specific binding event can be recognized by a natural fluorophore of hypericin with a lighting-up fluorescence response. Interestingly, inverting the polarity of the most 3' G in htG4 can sensitize the Ba 2+ response with the retaining Ba 2+ specificity and K + tolerance. This polarity inversion of htG4 causes a G4 conformation change in K + and the polarity-inverted htG4 tends to favorably dimerize in response to the Ba 2+ specific binding. To our knowledge, this is the first report that polarity inversion of G4 can be applied to construct a selective metal sensor with K + tolerance. Our findings will open a new way to conveniently regulate the G4 conformation and stability by polarity inversion towards developing high-performance sensors.
研究领域:
化学
·
材料科学
·
生物技术
·
纳米技术
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DOI
PubMed
高影响因子
ACS Applied Polymer Materials
·
2022
·
IF 4.855
Fengping Liu,Jing Sun,Qiang Fang
Two biobased functional monomers (M1 and M2) derived from isoeugenol have been successfully prepared through the Ullmann–Ma and the Piers–Rubinsztajn reactions in an overall yield of more than 81%. These two monomers have also been converted into the cross-linked polymers by a thermo-curing reaction. The obtained polymers display good thermostability, hydrophobicity, and low-dielectric performance. Among them, cured M1 exhibits a higher glass transition temperature (Tg) of 384 °C and a lower coefficient of thermal expansion (CTE) of 53 ppm/°C in a range of the temperatures from 25 to 350 °C, while cured M2 displays good dielectric properties with a dielectric constant (Dk) of 2.53 and a dielectric loss (Df) of 1.21 × 10–3 at a frequency of 5 GHz. Such good dielectric properties for cured M2 remain stable even keeping it in boiling water for 96 h. The thermo-curing reaction of the mixture of two monomers in a molar ratio of 1:1 was also investigated and the results indicated that the formed polymer (cured B1) had good comprehensive performances with a Tg of 265 °C, CTE of 67 ppm/°C, Dk of 2.62, and Df of 1.96 × 10–3. Such data are superior to those of many commercial dielectric materials, suggesting that the two biobased monomers are suitable as the precursors of dielectric materials for the application in high-frequency communication.
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高影响因子
Materials Today Communications
·
2021
·
IF 3.383
Min Shen,Tingting Pan,Juewei Ning,Jiayan Shi,Hongtian Liu,Yanqing Tian
We report on the fabrication of K + fluorescent sensor P2 based on thermoresponsive poly(N-isopropylacrylamide) and small molecule K + fluorescent sensor KS. P2 changed its size with a range from 35 °C to 42 °C and exhibited lower critical solution temperature (LCST) at 38 °C. The LCST affected the polymer’s nanostructures and microenvironment of KS, which in turn affected P2 ’s fluorescence intensities and responses to K + . Furthermore, P2 exhibited high selectivity and sensitivity to K + with a dynamic response range from 1 to 20 mM, enabling its suitableness for extracellular K + analysis. The sensor was further used to in situ monitor the K + fluctuation of Escherichia coli and B. Subtilis 168 bacteria under lysozyme stimulation in 96 well plate by a high throughput analysis approach, and cell species dependent K + release was observed. The PNIPAM-based K + sensor P2 shows potential application in antimicrobial drugs/peptides screening.
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2020
·Vol. 30
·期 17
·2000675
·
IF 16.836
Yang Hu,Wu Tang,Qihang Yu,Xinxin Wang,Wenqiang Liu,Jiahui Hu,Cong Fan
Organic redox-active molecules are inborn electrodes to store large-radius potassium (K) ion. High-performance organic cathodes are important for practical usage of organic potassium-ion batteries (OPIBs). However, small-molecule organic cathodes face serious dissolution problems against liquid electrolytes. A novel insoluble small-molecule organic cathode [ N , N ′-bis(2-anthraquinone)]-perylene-3,4,9,10-tetracarboxydiimide (PTCDI-DAQ, 200 mAh g −1 ) is initially designed for OPIBs. In half cells (1–3.8 V vs K + /K) using 1 m KPF 6 in dimethoxyethane (DME), PTCDI-DAQ delivers a highly stable specific capacity of 216 mAh g −1 and still holds the value of 133 mAh g −1 at an ultrahigh current density of 20 A g −1 (100 C). Using reduced potassium terephthalate (K 4 TP) as the organic anode, the resulting K 4 TP||PTCDI-DAQ OPIBs with the electrolyte 1 m KPF 6 in DME realize a high energy density of maximum 295 Wh kg −1 cathode (213 mAh g −1 cathode × 1.38 V) and power density of 13 800 W Kg −1 cathode (94 mAh g −1 × 1.38 V @ 10 A g −1 ) during the working voltage of 0.2–3.2 V. Meanwhile, K 4 TP||PTCDI-DAQ OPIBs fulfill the superlong lifespan with a stable discharge capacity of 62 mAh g −1 cathode after 10 000 cycles and 40 mAh g −1 cathode after 30 000 cycles (3 A g −1 ). The integrated performance of PTCDI-DAQ can currently defeat any cathode reported in K-ion half/full cells.
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危险品化学品经营许可证（带存储）