JOURNAL OF SOLID STATE CHEMISTRY
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2026
·
IF 3.2
Zheng-Xuan Ni,Wei Bao,Ming-Yang Shi,Jia-Jia Zhao,Li-Zhuang Chen
H/F substitution drives the coordination reconstruction of Mn 2+ in hybrid chlorides. • Isolated [MnCl 4 ] 2- tetrahedra change to face-sharing [Mn 2 Cl 9 ] 5- units. • The four-to-six coordination change enables green-to-red emission centered at 634 nm. • The fluorinated non-centrosymmetric crystal exhibits phase-transition and piezoelectric responses. Regulation of the Mn 2+ coordination environment is an effective approach for tuning the luminescence of Mn-based hybrid halides. However, the use of H/F substitution on organic cations to regulate the coordination environment of Mn 2+ and thereby tune the emission color remains rarely explored. In this work, H/F substitution was introduced into the piperidinium cation, driving the transformation of Mn-Cl coordination units from four-coordinate to six-coordinate structures and yielding the zero-dimensional hybrid chloride (4-F-Hpip) 5 [Mn 2 Cl 9 ]. This material crystallizes in the chiral non-centrosymmetric P 4 1 2 1 2 space group and contains face-sharing dinuclear [Mn 2 Cl 9 ] 5- units with octahedrally coordinated Mn 2+ . The resulting ligand-field change gives rise to broad red emission centered at 634 nm, while the compound also exhibits a reversible phase transition. In addition, a flexible PBAT composite film containing 10 wt% (4-F-Hpip) 5 [Mn 2 Cl 9 ] generates an open-circuit voltage of approximately 4.9 V. Its luminescent and piezoelectric responses were further integrated into a conceptual dual-input information encryption scheme. This work establishes H/F substitution as an effective cation engineering strategy for regulating Mn 2+ coordination and luminescence in hybrid manganese halides. Download: Download high-res image (198KB) Download: Download full-size image
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Qiang Gao,Xiaomei Wu,Xiangsheng Ma
Series of novel energy-saving window coatings based on F–Nb–TiO 2 /SiO 2 nanocomposites with superhydrophobic self-cleaning performance were successfully prepared. Surface modification of F–Nb–TiO 2 and SiO 2 nanoparticles by aminopropyl triethoxy silane and perfluorooctyltriethoxysilane produced hydrophobic powders. With the help of the hierarchical structures of F–Nb–TiO 2 /SiO 2 nanocomposites, superhydrophobic surfaces were obtained. The water contact angle of the composite coatings reached 155.6°. The prepared superhydrophobic coatings shown superior anti-fouling property and good mechanical performance. Furthermore, the composite coating can shield most of solar radiation. The composite coating lowed the air temperature of the simulate house by 11 °C in the outdoor thermal experiments. The integration of good solar filtration and exceptional anti-fouling performance makes F–Nb–TiO 2 /SiO 2 coatings suitable candidates for energy-saving window coatings.
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Haotian Liu,Liang Shi,Cheng Liu,Dainan Zhang,Kui Liu,Huaiwu Zhang
Ion substitution engineering is an effective procedure in refining the crystal structure and performance for the microwave dielectric ceramics . In this study, MgTa 2 O 6- x F 2 x ( x = 0.1, 0.2, 0.3, 0.4, 0.5, 0.6) ceramics were synthesized using the conventional solid-phase reaction method. The effects of F − substitution for O 2− in MgTa 2 O 6 matrix were systematically investigated. The correlations between the crystal structure and the microwave dielectric properties were analyzed. The solution of F − into the oxygen sites was confirmed by the XRD and Raman spectra. The introduction of F − improved the morphology as well as the stability of the crystal structure significantly, which successfully depressed the electromagnetic wave loss through the bulk and enhanced the quality factor ( Q × f ) by nearly 50%, reaching up to 179,000 GHz (7.15 GHz) in the sample of x = 0.4 at the sintering temperature of 1425 °C.
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JOURNAL OF MOLECULAR MODELING
·
2021
·Vol. 27
·期 6
·1-8
·
IF 1.81
Xu Shuhong,Tan Linfeng,Liu Fan,Cui Yiping,Wang Chunlei,Zhang Rong
Optical properties of N- and F-doping triangular-shaped carbon molecules have been investigated in theory and experiment. The theoretical results showed that carbon molecules with impurity F and Cl have the same characters with pure carbon. Doping N into pure carbon molecule would change the optical rotation at 589 nm. For doping N replacing hydrogen atom structures (N-doping 1 and N-doping 2 molecules), the absorption spectra of them are similar to pure carbon molecule. However, for molecules with impurity N atom in benzene ring (N-doping 3 and N-doping 4 molecules), the peaks of wavelength of absorption spectra shift to long wavelength compared to that of pure carbon molecule. Moreover, the delocalization of molecular orbital (MO) is different from pure carbon molecule, which is caused by the impurity N changing the electrons distribution of benzene ring. We have calculated 3 without H and 4 without H molecules which are removing hydrogen atom in nitrogen atom from N-doping 3 and 4. 3 without H and 4 without H molecules have similar optical properties with pure carbon molecule. The results testified that the impurity N and F would not change the optical properties of carbon molecule if impurity did not change the delocalization of all benzene rings. Graphical abstract
Optical properties of nitrogen- and fluorine-doping carbon molecules investigating in theory and experiment.
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CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Mengting Jiang,Liwen He,Chao Duan,Xiaoping Ouyang
Poor fracture toughness is a major limitation of SiC ceramics, which greatly affects their application range. Herein, a novel strategy is proposed to enhance the fracture toughness of SiC ceramics by cross-linking carbon nanotubes (CNTs) coated with polydopamine (PDA) to Ti 3 C 2 modified with 3-glycidyloxypropyltrime-thoxysilane (KH560) (PDA-CNTs@f-Ti 3 C 2 ). Then, PDA-CNTs@f-Ti 3 C 2 was added to SiC powder to prepare the final composite. The influence of PDA-CNTs@f-Ti 3 C 2 addition on the microstructure and mechanical properties of the SiC composite is discussed. The results showed that, compared with CNTs and Ti 3 C 2 , the PDA-CNTs@f-Ti 3 C 2 composites exhibited better dispersibility in water. The flexural strength was significantly enhanced (~89%) in the SiC composite containing 3 wt% PDA-CNTs@f-Ti 3 C 2 , from 228.99 MPa to 433.55 MPa. The fracture toughness of the SiC composite containing 3 wt% PDA-CNTs@f-Ti 3 C 2 improved by 62%, from 3.97 MPa/m 1/2 to 6.44 MPa/m 1/2 .
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Iranian Journal of Biotechnology
·
2020
·
IF 0.973
Shuang Feng Li,Huai Wang,Jia Li Chen,Hui Xia Zhu,Ri-Sheng Yao,Huan Wu
Background: Lignin is the largest natural aromatic polymer in nature and is also a unique aromatic-based biopolymer, accountingfor nearly 30% of the earth’s organic carbon. Generally, lignin is regarded as waste and is mainly used as a low- valuefuel that is burned to generate heat and energy to solve the problem of biomass waste; for this obstacle of lignin,highly efficient biodegradation plays a critical role in developing an environmentally friendly technique for lignin biotransformation. Objectives: This study intends to isolate and purify several microbial strains from nature. It also explores how their lignin degradationis able to enhance the biodegradation and recycling of biomass and the reclamation of lignin in wastewater from pulp and paper mills. Materials and Methods: Lignin-degrading microbial strains were isolated from soil using medium containing sodium lignosulphonate as the sole carbonsource. They were then screened by aniline blue and guaiacol plate, and then the best strain was chosen and identified.The conventional one-factor method was used to optimize various parameters that affect lignin’s degradation ability. Results: The strain possessing the highest lignin biodegradation ability was identified and denominated as Aspergillus Flavus F-1. After optimization, the maximum degradation rate of lignin, 44.6% within 3 days, was obtained at pH 7.0, 30 ℃, 2.5 g·L -1 ammoniumsulfate, 2 g·L -1 lignin and 0.5 g·L -1 glucose. The results show the LiP and Lac secreted from Aspergillus Flavus F-1 played the main role in the degradation of lignin. Conclusion: One microbial strain, Aspergillus Flavus F-1, was successfully isolated with a lignin-degrading abilitythat can cut the lignin into fragments. This provides a promising candidate for the transformation and utilization of crop waste biomass for various industrial purposes.
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ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Yuanqin Li,Kang Wang,Jiawei Chen,Wenguang Zhang,Xuehuan Luo,Zhangmin Hu,Qiankui Zhang,Lidan Xing,Weishan Li
High-voltage cathodes provide a promising solution to the energy density limitation of currently commercialized lithium-ion batteries, but they are unstable in electrolytes during the charge/discharge process. To address this issue, we propose a novel electrolyte additive, pentafluorophenyltriethoxysilane (TPS), which is rich in elemental F and contains elemental Si. The effectiveness of TPS has been demonstrated by cycling a representative high-voltage cathode, LiNi0.5Mn1.5O4 (LNMO), in 1.0 M LiPF6–diethyl carbonate/ethylene carbonate/ethyl methyl carbonate (2/3/5 in weight). LNMO presents an increased capacity retention from 28 to 85% after 400 cycles at 1 C by applying 1 wt % TPS. Further electrochemical measurements combined with spectroscopic characterization and theoretical calculations indicate that TPS can not only construct a robust protective cathode electrolyte interphase via its oxidation during initial lithium desertion but also scavenge the detrimental hydrogen fluoride (HF) present in the electrolyte via its strong combination with the species HF, F–, and H+, highly stabilizing LNMO during the charge/discharge process. These features of TPS provide a new solution to the obstacle in the practical application of high-voltage cathodes not limited to LNMO.
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JOURNAL OF POWER SOURCES
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2021
·
IF 9.127
Ailing Tian,Kailin Luo,Zhendong Li,Mingming Ma,Shun Li,Xingyi Wang,Deyu Wang,Zhe Peng
Lithium (Li) metal and alloy anodes are strongly attractive for next high-energy-density batteries , owing to their high theoretical specific capacity and low redox potentials . However, the fast electrode pulverization caused by large volume variation upon cycling inhibits the use of the Li metal and alloy anodes seriously, whereas the sluggish charge transfer and weak electrode/electrolyte interphase are mainly responsible for their uneven volume expansion and surface breaks, respectively. Herein, a versatile F–N–S doped lithiophilic interphase is obtained via a one-pot electrochemical fabrication process with high controllability, which exhibits high robustness, Li affinity and fast Li transfer, and significantly outperforms the single lithiophilic interphase obtained via chemical route. When this advanced interphase is applied to the copper or aluminum electrodes, great stabilizations of Li plating/stripping or Li insertion/extraction processes can be achieved. This work emphasizes the importance of the interphase composition for designing stable high-energy-density electrodes, and gives insights on a general and efficient remedy to boost the performances of the large-volume-change electrodes.
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PROGRESS IN ORGANIC COATINGS
·
2019
·
IF 3.42
Xia Zhao,Hong Hao,Yanping Duan,Jun Wang
Superhydrophobic and highly oleophobic coatings have the potential for self-cleaning, anti-icing, optoelectronic and antifouling application. In this study, emulsion polymerization and sol-gel methods were employed to prepare a new superhydrophobic and highly oleophobic coating. The structures, surface morphology and the properties of the coating were analyzed by IR, SEM, TG and CA. Pencil scratch test and cross-cut tape test were performed to evaluate the coating mechanical properties. The coating exhibited superhydrophobicity with a water contact angle of greater than 150° and a sliding angle of 4.42° as well as high oleophobicity as demonstrated by a diiodomethane contact angle of 147.41° and a sliding angle of 9.85°. The coating exhibited 6H pencil hardness and 5B cross-cut adhesion properties. These interesting and robust properties make them promising candidates for some applications.
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TOPICS IN CATALYSIS
·
2017
·Vol. 60
·期 12
·980-986
·
IF 2.486
Zhang Xiuling,Li Zhuang,Zhan Zhibin,Di Lanbo
F-Doped TiO 2 was successfully fabricated using gas–liquid cold plasma with different fluorine sources, including NaF, NaF combined with [C 4 MIM]HSO 4 , and [C 4 MIM]BF 4 . The samples were characterized by XRD (X-ray diffraction), XPS (X-ray photoelectron spectroscopy), and BET (N 2 adsorption–desorption isotherms). Photocatalytic activity of the samples was tested by degradation of methylene blue (MB) dye under simulated sunlight. The results show that doping with different fluorine sources was beneficial to form interstitial F-doped TiO 2 , and ionic liquids used in our work were most favorable to the formation of interstitial F-doped TiO 2 . Calcination of the 0.6-F–[C 4 MIM]BF 4 –TiO 2 sample at 500 °C shows that interstitial F-doped TiO 2 has an excellent thermal stability, a suitable mesoporous structure, higher specific surface area (60.5 m 2 g −1 ) and the best photocatalytic activity. MB degradation was about 98% under the stimulated sunlight for 30 min, and its apparent rate constant was 42 times higher than photolysis and was about 2.9 times as that prepared without addition of ionic liquid. Furthermore, the stability of ionic liquids in the gas–liquid plasma was also investigated and discussed with the assistance of Fourier transform infrared (FTIR) spectroscopy.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·
IF 6.2
Yuan-Bin Chen,Ling Tang,Xiuyuan Su
Low-temperature sintered microwave dielectric ceramics are gaining increasing attention for next-generation wireless communication systems, particularly within the 6 G frequency range. However, materials that simultaneously exhibit ultra-low dielectric loss and low sintering temperatures remain scarce. In this study, Nd 2 [Zr 1-X (Bi 0.5 Ta 0.5 ) X ] 3 (MoO 4 ) 9 ceramics were prepared via a conventional solid-state reaction method and exhibited a single-phase structure with a trigonal symmetry (space group R 3 ¯ C, No. 167). The optimal sample at x = 0.11 sintered at 750 ℃ showed excellent performance: ε r = 11.4, Q×f = 186,300 ± 8900 GHz, and τ f = –42.9 ppm/℃. The elevated Q×f value is chiefly ascribed to increased lattice energy, with its variation more plausibly arising from intrinsic effects within the material. The dielectric constant (εᵣ), analyzed using the Clausius–Mosotti equation, was predominantly influenced by ionic polarizability. According to P–V–L theory, the effective bond strength f iNd–O played a major role in determining εᵣ, while τ f was governed by the bond energy and thermal expansion behavior of Mo–O bonds. Raman spectroscopy further confirmed the structure–property relationships. These results suggest that B-site substitution with (Bi 0.5 Ta 0.5 ) 4+ not only promotes densification and increases lattice energy, but also maintains thermal stability, thereby enhancing Q×f without compromising τ f . This system offers strong potential for integration into future microwave dielectric components.
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ZEITSCHRIFT FUR KRISTALLOGRAPHIE-NEW CRYSTAL STRUCTURES
·
2023
·Vol. 238
·期 6
·1069-1070
·
IF 0.3
Yan-Qing Wang,Wen-Qing Yan,Li-Xue Nie,Ping-Ping Luan,Chao-Qun Li
C 20 H 22 Cu 3 N 8 O 10 , monoclinic, C 2/ c (no. 15), a = 12.0766(11) Å, b = 16.2778(14) Å, c = 14.7605(13) Å, β = 97.8580(10) ∘ , V = 2874.4(4) Å 3 , Z = 4, R
gt ( F ) = 0.0420, wR
ref ( F
2 ) = 0.0988, T = 298.15 K.
研究领域:
无机化学
·
晶体学
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