COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2022
·
IF 9.463
Yanli Li,Di Zhang,Bing Zhou,Chengen He,Bo Wang,Yuezhan Feng,Chuntai Liu
Polymer-based layered conductive films used in electromagnetic interference (EMI) shielding and thermal management applications face a huge challenge of high contact electrical/thermal interfacial resistance. In this work, synergistic effect strategy between MXene and graphene nanoplates (GNP) is put forward to construct a directly contacted conductive network in polymer layered film. In detail, polyvinylidene fluoride (PVDF)-based layered films were prepared by the scalable blade-coating process. Under the above synergistic effect, a directly contacted in-plane electrical/thermal conduction network was obtained in the composite film . As a result, the MXene/GNP-PVDF composite film reveals both synergistic enhancements in electrical conductivity , EMI shielding effectiveness (SE) and in-plane thermal conductivity with the optimal values of 7423 S/m, 36.3 dB and 36.9 W/m K, respectively, which exceed those of the composite films with only MXene or GNP. Therefore, this work provides a simple synergistic strategy for the design and preparation of multifunctional EMI shielding and thermal management films.
研究领域:
材料科学
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电子工程
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 18
·6299-6305
·
IF 7.059
Xinlong Dong,Yuexiao Pan,Yajun Jia,Rongjing Liu,Hongzhou Lian,Jun Lin
Mn4+-activated red phosphors have recently attracted tremendous attention for their fascinating performance in white light emitting diode (WLED) applications, achieving warm white light, while the thermal stability of fluorides is still considered as a drawback. Herein, we report a novel red phosphor composed of Ba3Sc2F12:Mn4+ (BSF:Mn), in which the emitting centers of Mn4+ ions are located in the sites of Sc3+ ions. The photoluminescence of BSF:Mn varies with the concentration of K2MnF6, reaction temperature, and the concentrations of NH3·H2O in the reaction system. Partly substituting Ba2+ with Ca2+ decreases the luminescence intensity of BSF:Mn. By employing the as-prepared phosphor BSF:Mn as a red component, a high-performance WLED with a correlated color temperature (CCT) of 4796 K and a color rendering index (CRI) of 85.2 was obtained. The phosphor BSF:Mn remains undecomposed up to 800 °C; therefore, this work provides a strategy to explore a novel Mn4+-doped fluoride with particularly good thermal stability.
研究领域:
材料科学
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光学
✓ 已验证
DOI
高影响因子
Science China-Chemistry
·
2021
·Vol. 64
·期 9
·1498-1503
·
IF 9.445
Zhang Wenyao,Zhang Zhizhong,Jin Wenqi,Zhang Ruonan,Cheng Meng,Yang Zhihua,Pan Shilie
The introduction of oxofluoride anion into anionic group assists to tune optical properties owing to the change of coordination, electronegativity, and according anionic framework. Here, we proposed a rational design of new compounds by fluorine-driven structure and optical property evolution. A new borophosphate Ba 2 BP 3 O 11 with the monoclinic space group P 2 1 / c has been synthesized in the sealed system. Ba 2 BP 3 O 11 exhibits a rare P–O–P bridge formation, which is the first example in alkaline-earth metal borophosphates. By further substituting [BO 4 ] 3− with [BO 3 F] 4− , the first alkaline-earth metal/lead fluoroborophosphates M 2 BP 2 O 8 F (M = Ba and Pb) with the same space group were designed. Since the scissors effect of fluorine, in M 2 BP 2 O 8 F (M = Ba and Pb), a BO 3 F tetrahedron corner-sharing with three PO 4 tetrahedra forms 1D chains along the b -axial direction, which are filled by MO n (M = Ba/Pb, n = 5, 6, 8) distorted polyhedra. The first principles calculation shows that the borophosphate Ba 2 BP 3 O 11 has a birefringence about 0.013 @1,064 nm, while the fluoroborophosphates M 2 BP 2 O 8 F (M = Ba and Pb) have the values of 0.035 and 0.043 @1,064 nm, respectively. Such an apparent enhancement in birefringence is derived from synergies of the oxyfluoride and cation. The introduction of fluorine-containing heteroanionic groups provides a feasible strategy to design novel promising optical materials.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2021
·
IF 3.764
Tongge Wang,Miao Chang,Tongan Yan,Yunpan Ying,Qingyuan Yang,Dahuan Liu
Sulfur hexafluoride (SF6), which has a greenhouse effect of 228 000 times more terrible than carbon dioxide, has attracted increasing attention. Its efficient capture, especially from the mixtures with low SF6 concentrations, is urgently needed while challenging. Herein, we use a calcium (Ca)-based metal–organic framework (MOF; SBMOF-1) with multiaromatic ring-functionalized channels to achieve a record selectivity as high as 727 for an industrially relevant SF6/N2 mixture (volume concentration of SF6: 0.03%) at 298 K and 1 bar. Grand canonical Monte Carlo simulations and density functional theory calculations identified that SF6 molecules were energy-favorably trapped in the functionalized MOF channels by the strong interactions between the channel walls and six fluorine atoms on SF6. Excellent breakthrough results accompanied with good stability and regenerability recommend its promising application for practical SF6 capture from low-concentration SF6 mixtures, which also provides a new benchmark for SF6/N2 separation.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2019
·
IF 7.149
Huiling Liu,Jinglong Han,Jili Yuan,Chengbin Liu,Dong Wang,Tian Liu,Meijun Liu,Jinming Luo,Aijie Wang,John C. Crittenden
Efficient elimination of antibacterial activity of halogenated antibiotics by dehalogenation pretreatment is desired for a biochemical treatment process. In this study, crystalline cobalt phosphide nanosheet arrays on a Ti plate (C-CoP/Ti) are fabricated by a simple electrodeposition and phosphorization process. The crystalline structure greatly promotes atomic hydrogen (H*) generation. Moreover, the nanosheet arrays can provide abundant active sites and accelerate electron transfer and mass transport. As a result, the dehalogenation rate of florfenicol (FLO, an emerging organic pollutant) on C-CoP/Ti is 11.1, 2.97, and 13.6 times higher than that on amorphous CoP/Ti, Pd/Ti, and bare Ti, respectively. The C-CoP/Ti electrode achieves 97.4% dehalogenation of FLO (20 mg L–1) within 30 min at −1.2 V (vs Ag/AgCl). Nearly 100% of Cl and 20% of F are broken away within 120 min, showing the highest electrocatalytic defluorination efficiency reported so far. Both experimental results and theoretical calculations reveal that the dehalogenation of FLO on C-CoP/Ti is synergistically accomplished via direct reduction of electron transfer and indirect reduction of H*. This study develops a highly efficient non-noble metal electrode material for dehalogenation of halogenated organic compounds.
研究领域:
环境科学
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材料科学
·
化学
✓ 已验证
DOI
PubMed
高影响因子
OPTICAL MATERIALS
·
2017
·
IF 2.238
Weiwei Li,Haijun Huang,Bingchu Mei,Jinghong Song
In this paper, ytterbium doped strontium fluoride (Yb: SrF 2 ) nanoparticles were synthesized by direct precipitation method. High-speed centrifugation was used to separate high sintering activity of nanopowders from powders with hard aggregated and large size. Using powders at different parts of the centrifugal tube as starting powders, Yb: SrF 2 transparent ceramics was fabricated by hot pressed (HP) method for the first time. Effects of morphology and particle size on the sinterability of Yb: SrF 2 nanopowders were investigated. The transmittance reached 77% at the wavelength of 1200 nm and pores stilled remained in the ceramics. The spectroscopic and thermal properties of Yb: SrF 2 transparent ceramics were also investigated. This paper provides an effective way to obtain well dispersed and high sinterability nanoparticles for SrF 2 ceramics sintering.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
TEXTILE RESEARCH JOURNAL
·
2024
·
IF 1.6
Wenjing Zhao,Zhihui Sui,Qi Zhang,Lijian Sun,Fang Hu,Xiangyu Cao
Natural leather-based materials possess a combination of air permeability, wear resistance, and plasticity. However, conventional leather products have inherent limitations that make them unsuitable for unconventional applications. Therefore, it is necessary to develop new capabilities in order to overcome these limitations. In this study, we explored the conversion of regular leather into a high-strength product with hydrophobic properties through surface engineering. To achieve this, we synthesized polysiloxane-modified fluorinated waterborne polyurethane emulsions as functional coatings using emulsion polymerization. The structure and properties of the treated leathers were characterized using techniques such as Fourier transform infrared, thermogravimetry, X-ray photoelectron spectroscopy, X-ray diffraction, and scanning electron microscopy. The results demonstrated that the synthesized polysiloxane-modified fluorinated waterborne polyurethane successfully penetrated and combined with the fibers of the leather, resulting in excellent hydrophobicity. The water contact angle increased to 124.3°. Furthermore, the tensile strength and tear strength of unfinished leather are 875 N and 114 N, respectively. The application of waterborne polyurethane-derived functional additives as coatings resulted in a significant increase in tensile and tear strength of the leather by 60 N and 16 N, respectively. In addition, the softness of the leather increased from 7.6 mm to 10.09 mm. Overall, the use of this functional waterborne polyurethane coating will contribute to the diversification of leather applications.
研究领域:
材料科学
·
表面工程
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
·
2016
·
IF 3.698
Chunlu Li,Nan Chen,Yanan Zhao,Rui Li,Chuanping Feng
In this study, an effective defluoridation adsorbent was developed by depositing polypyrrole (PPy) on granular peanut shell biological carbon (BC) via in situ chemical oxidative polymerization. The variables of defluoridation process (i.e., adsorbent dosage, fluoride solution pH, and anionic interference) were tested. The mechanism was determined by isotherm and kinetic studies, Brunauer-Emmett-Teller (BET) method, scanning electronic microscopy (SEM), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared (FTIR) spectroscopy and automatic titration. The PPy-grafted BC (PPy/BC) composite performed commendably from pH 2.0 to 10.0, and exhibited high selectivity for fluoride in the presence of several co-existing anions. The experimental data were described well by a Langmuir isotherm curve, and the maximum adsorption capacity was 17.15 mg g −1 . Kinetic studies illustrated the adsorption process was accomplished via surface adsorption as well as by intraparticle diffusion. In addition, mesoporous diffusion was the rate-controlling step in intraparticle diffusion process. BET and SEM analysis revealed the sponge-like polymer adhered to the BC and plugged the pores. XPS, FTIR, and SEM confirmed that fluoride removal was accomplished via the replacement of doped ionizable chloride ions (Cl − ) coupled with positively charged nitrogen (N + ), computation of XPS data enabled the formulation of a three-layer-deep hypothesis for PPy.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
·
2018
·
IF 0.824
Ran LI,Ze-Jia LIN,Jin-Yi YANG,Zhen-Lin XU,Hong WANG,Hong-Tao LEI,Yuan-Ming SUN,Yu-Dong SHEN
A high-affinity polyclonal antibody was prepared by immunizing animals with haptens FFD and FFM. Under the optimal combination of coating antigen and antibody, an indirect competitive enzyme-linked immunosorbent assay (icELISA) for simultaneous detection of florfenicol and thiamphenicol residues in animal meat and urine samples was developed. The icELISA showed an IC 50 value of 1.32 ng mL −1 for florfenicol and 2.13 ng mL −1 for thiamphenicol, respectively. The linear ranges were from 0.31 to 5.61 ng mL −1 with a limit of detection of 0.12 ng mL −1 for florfenicol, and 0.41 to 11.2 ng mL −1 with a limit of detection of 0.15 ng mL −1 for thiamphenicol, respectively. The average recoveries of florfenicol and thiamphenicol in spiked samples ranged from 77.2% to 116.0% with a relative standard deviation of less than 15%. Therefore, this proposed icELISA provided a valid detection method for florfenicol and thiamphenicol residues in animal tissue and urine samples.
研究领域:
免疫学
·
食品安全检测
✓ 已验证
DOI
高影响因子
Journal of Coatings Technology and Research
·
2019
·Vol. 16
·期 5
·1305-1316
·
IF 1.584
Shi Hongyi,Liu Weiqu,Liu Chunhua,He Sha,Jiang Chi,Wang Zhengfang
Monomethacryloyloxy-terminated fluorinated oligomers (PPFOMA-GMA and PHFBMA-GMA) and methyl allyl alcohol polyoxyethylene ether-modified epoxy resin (HPEGEA) were successfully synthesized and used as reactive additives and emulsifier for epoxy acrylate, respectively. FTIR, 1 H NMR, and GPC were used to characterize the structures of PPFOMA-GMA, PHFBMA-GMA, and HPEGEA. The influence of the concentrations of PPFOMA-GMA and PHFBMA-GMA on the properties of waterborne epoxy acrylate (WEA) resin coatings was investigated. The surface energy of waterborne epoxy acrylate coating was decreased from 38.20 mN/m to 15.31 mN/m by adding just 0.21 wt% PPFOMA-GMA, indicating its high effectiveness in improving the hydrophobic properties of the surface. The surface compositions of the WEA resin coatings (with 0.85 wt% PPFOMA-GMA or 0.85 wt% PHFBMA-GMA) were characterized by XPS. The XPS results confirmed the quantitative enrichment of fluorine atoms on the surface. What is more, the physical properties of waterborne epoxy acrylate coatings prepared with different concentrations of fluorinated reactive additive, such as optical transmittance, adhesion (on glass, PET, and tinplate), pencil hardness, water absorption, and thermal properties, were also analyzed in detail. Hence, the waterborne epoxy acrylate coatings prepared with low concentrations of reactive additives were economical and have potential for large-scale industrial applications.
研究领域:
高分子化学
·
材料科学
·
表面工程
✓ 已验证
DOI
高影响因子
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
·
2022
·
IF 7.129
Shiyuan Zhao,Jinxiu Guo,Hongjia Xue,Junjun Meng,Dadi Xie,Xi Liu,Qingqing Yu,Haitao Zhong,Pei Jiang
Fluoride is widely present in the environment. Excessive fluoride exposure leads to fluorosis, which has become a global public health problem and will cause damage to various organs and tissues. Only a few studies focus on serum metabolomics, and there is still a lack of systematic metabolomics associated with fluorosis within the main organs. Therefore, in the current study, a non-targeted metabolomics method using gas chromatography-mass spectrometry (GC-MS) was used to research the effects of fluoride exposure on metabolites in different organs, to uncover potential biomarkers and study whether the affected metabolic pathways are related to the mechanism of fluorosis. Male Sprague-Dawley rats were randomly divided into two groups: a control group and a fluoride exposure group. GC-MS technology was used to identify metabolites. Multivariate statistical analysis identified 16, 24, 20, 20, 24, 13, 7, and 13 differential metabolites in the serum, liver, kidney, heart, hippocampus, cortex, kidney fat, and brown fat, respectively, in the two groups of rats. Fifteen metabolic pathways were affected, involving toxic mechanisms such as oxidative stress, mitochondrial damage, inflammation, and fatty acid, amino acid and energy metabolism disorders. This study provides a new perspective on the understanding of the mechanism of toxicity associated with sodium fluoride, contributing to the prevention and treatment of fluorosis.
研究领域:
毒理学
·
代谢组学
·
公共卫生
✓ 已验证
DOI
高影响因子
LIQUID CRYSTALS
·
2020
·
IF 2.908
Mengting Zhang,Shenghua Du,Diao Yuan,Pei Chen,Guoqing Liu,Jiazhen Dang,Xinbing Chen,Zhongwei An
New kinds of heterocyclic mesogenic compounds containing benzoxazole, ethynyl, and laterally fluorinated phenyl groups, namely 2-[4-[2-[4-alkoxyphenyl]ethynyl]-2,3-difluorophenyl]-benzoxazole derivatives (nPEDFPBx), are synthesized and evaluated. The compounds nPEDFPBx except nitro-substituted ones have enantiotropic nematic mesophases with mesophase ranges of 16–86°C and 29–108 °C on heating and cooling, respectively. The results show that introduction of two lateral fluorine atoms into molecule results in enhanced nematic mesophase stability. Meanwhile, nPEDFPBx displays much higher birefringence (0.507–0.624) than common tolane-based liquid crystals, which is ascribed to its large π-conjugated molecule composed of benzene, ethynyl, and benzoxazole mesogenic unit. The nPEDFPBx has a high potential to serve as a dopant for liquid crystal mixture.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）