MOLECULES
·
2022
·Vol. 27
·期 13
·4147
·
IF 4.927
Canxing Zhao,Rui Shi,Shouchun Li,Penghui Li,Xiaoxue Zhang,Guolin Tong
Novel reactive dyes with mono- and bi-acyl fluoride reactive groups have been designed and synthesized, which are obtained by using 2-amino-8-naphthol-6-sulfonic acid or 1-amino-8-naphthol-3,6-disulfonicacid as the coupling component and 4-aminobenzoyl fluoride (PABF) as the diazo component. Their structures have been defined by nuclear magnetic resonance spectroscopy and ultraviolet–visible spectra (UV—Vis). The novel reactive dyes were evaluated on cotton by using the exhaust dyeing method. The properties were examined in detail, and the results showed that the dye concentration of 4% (o.w.f), pH = 9, and salt-free was the most effective condition. The fixation of the novel reactive dyes on cotton was 60.27% and 64.13%, respectively. The micro-fluorine-containing reactive dyes have favorable dyeing properties owing to the covalent bond formed between the reactive group of dyes and the functional group of cotton fibers, which can achieve salt-free dyeing of cotton.Keywords:acyl fluoride;reactive dyes;cotton fabric;low molecular weight;salt-free
研究领域:
化学
·
纺织科学与工程
✓ 已验证
DOI
PubMed
高影响因子
Journal of Energy Chemistry
·
2022
·
IF 13.599
Junyan Li,Wei Zhang,Xin Ge,Ming Lu,Xiangxin Xue,Zizhun Wang,Nailin Yue,Junkai Zhang,Xingyou Lang,Qing Jiang,Weitao Zheng
Inspired by a well-known architecture notion that load-bearing walls enable maintaining a highly-stable multiple-floored building, superior advantages are afforded via fabricating the NH 4 + ions pre-intercalated Mo 2 CT x MXene (Mo 2 CT x -N) in a mixed solution of NH 4 F and HCl via a simple one-step hydrothermal method. As a result of the synergistic effects of pillared structure, immobilizing -F groups and unlocking Mo-based redox, the Mo 2 CT x -N remarkably delivered a reversible capacity of 384.6 mAh g −1 at 200 mA g −1 after 100 cycles. Our work lays a foundation for fully packaging its optimal performance via carding and architecting the chemistry of the MXene layers and between them.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Nanoscale Research Letters
·
2021
·Vol. 16
·期 1
·1-10
·
IF 4.703
Feng Yanmin,He Meng,Liu Xia,Wang Wei,Yu Aifang,Wan Lingyu,Zhai Junyi
The output power of the triboelectric nanogenerator (TENG) strongly depends on the performance of triboelectric materials, especially microstructures and functional groups of them. In this work, aiming at the excellent triboelectric ability, alternate-layered MXene composite films-based TENG with abundant fluorine groups(-F) through layer-by-layer stacking are designed and fabricated. Benefitting from the uniform intrinsic microstructure and increased dielectric constant, when the amount of the Nb 2 CT x nanosheets increases to 15 wt%, the TENG based on Nb 2 CT x /Ti 3 C 2 T x composite nanosheets films achieves the maximum output. The short-circuit current density of 8.06 μA/cm 2 and voltage of 34.63 V are 8.4 times and 3.5 times over that of pure Ti 3 C 2 T x films, and 3.3 times and 4.3 times over that of commercial poly(tetrafluoroethylene) (PTFE) films, respectively. Furthermore, the fabricated TENG could be attached to human body to harvest energy from human motions, such as typing, texting, and hand clapping. The results demonstrate that the alternate-layered MXene composite nanosheet films through layer-by-layer stacking possess remarkably triboelectric performance, which broaden the choice of negative triboelectric materials and supply a new choice for high output TENG.
研究领域:
材料科学
·
能源技术
·
纳米科技
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Fang Li,Xiaoyang Yue,Lei Cheng,Jiajie Fan,Quanjun Xiang
Inspired by the lotus leaf effect, constructing a hydrophobic surface to endow photocatalysts with underwater aerophilicity, is an effective measure to improve the accessibility of CO 2 on the catalyst surface during CO 2 photoreduction in the liquid phase. Unfortunately, the aerophilic advantages of the material cannot be fully exploited with the extremely low solubility of CO 2 in water. Thus, applying the “hydrophobicity-aerophilicity effect” to gaseous CO 2 atmosphere, that is, proving that the hydrophobic material has aerophilic effect in air, has become a challenge. Herein, a hydrophobic graphitic carbon nitride (g-C 3 N 4 ) photocatalyst modified by CF 2 groups (CF 2 -TCN) is developed to enhance the aerophilicity of the CF 2 -TCN in air. A theoretical model of the gas-phase “hydrophobicity-aerophilicity effect” and the corresponding theoretical support are presented. Experimental characterizations demonstrate that the grafted CF 2 groups create a hydrophobic surface for CF 2 -TCN, acting as a gas transport layer and enhancing the aerophilicity of CF 2 -TCN. Theoretical calculations further explain that the strong electronegativity of F atoms in CF 2 groups affects the electron cloud distribution of g-C 3 N 4 , facilitating the adsorption and activation of CO 2 by CF 2 -TCN. Furthermore, the electron-withdrawing effect of F atoms efficiently extracts electrons, accelerating the intramolecular charge transfer. Benefiting from enhanced aerophilicity and improved electron transfer, the output of CO and CH 4 by CF 2 -TCN are 30.94 and 7.39 μmol·h −1 ·g −1 without any sacrificial agents, far exceeding that of bulk g-C 3 N 4 (BCN) by 5.54 and 18.95 times, respectively.
研究领域:
材料科学
·
环境科学
·
理论化学
✓ 已验证
产品关联
DOI
高影响因子
Energy & Environmental Materials
·
2022
·Vol. 6
·期 3
·e12351
·
IF 13.443
Qiyu Wang,Xiangqun Xu,Bo Hong,Maohui Bai,Jie Li,Zhian Zhang,Yanqing Lai
Quasi-solid-state lithium metal battery is a promising candidate for next generation high energy density and high safety power supply. Despite intensive efforts on electrolytes, uncontrolled interfacial reactions on lithium with electrolyte and patchy interfacial contacts still hinder its practical process. Herein, we bring in rationally designed F contained groups into polymer skeleton via in-situ gelation for the first time to establish quasi-solid-state battery. This method achieves a capacity retention of 90% after 1000 cycles at 0.5C with LiFePO 4 cathodes. The interface constructed by polymer skeleton and reaction with –CF 3 lead to the predicted solid electrolyte interface species with high stability. Furthermore, we optimize molecular reactivity and interface stability with regulating F contained end groups in the polymer. Comparisons on different structures reveal that high performance solid stable lithium metal batteries rely on chemical modification as well as stable polymer skeleton, which is more critical to construct robust and steady SEI with uniform lithium deposition. New approach with functional groups regulation proposes a more stable cycling process with a capacity retention of 94.2% at 0.5C and 87.6% at 1C after 1000 cycles with LiFePO 4 cathodes, providing new insights for the practical development of quasi-solid-state lithium metal battery.
研究领域:
电化学
·
材料科学
·
能源存储
·
界面化学
·
高分子化学
✓ 已验证
DOI
高影响因子
DYES AND PIGMENTS
·
2016
·
IF 4.055
Da-fa Yang,Xiang-jun Kong,Dan Gao,Hong-sheng Cui,Ting-ting Huang,Jin-xin Lin
Reactive disperse dyes with mono- and bi-acyl fluoride reactive groups have been synthesized using a simple and convenient method. The structures of these dyes have been defined by 1 H, 13 C and 19 F NMR. The cotton dyeing in supercritical carbon dioxide (Sc CO 2 ) with dyeing temperature varying from 60 °C to 120 °C and time between 1 h and 3 h and with the concentration of 0.5% owf (on weight of fabric) have been studied. Significant improvement of the color fastness of washing and rubbing has been observed owing to the covalent bond formed between the reactive group of dyes and the functional group of cotton fibers . Besides, the dyed fabrics possess favorable fastness properties , indicating the achievement of lower-temperature dyeing of cotton in Sc CO 2 . Additionally, the end products meet the garment dyeing standards as well. A mechanism of dyeing process is tentatively speculated meanwhile.
研究领域:
纺织化学
·
染整工程
·
绿色化学
·
高分子材料与纤维科学
·
环境友好染色技术
✓ 已验证
DOI
高影响因子
Journal of Macromolecular Science Part A-Pure and Applied Chemistry
·
2025
·
IF 2.4
Li. Fan,Yang Xiong,Ying Liu,Yawen Huang
The current research highlights regarding future low-dielectric resins for circuit boards lie in their recyclability and pattern ability. In the present work, we put forward a new idea to simultaneously achieve the recyclability and pattern ability of low-dielectric resins in circuit board. In detail, a series of low-dielectric vitrimers were prepared by copolymerization of fluorinated monomers followed by employing imine cross-linked network. By incorporating fluorine-contained units, the dielectric constant of the vitrimers reached to ∼2.4, while preserving high mechanical strength around 33 MPa. Moreover, after reprocessing three times, the dielectric constants of the PFS-imines remained almost unchanged and 89% of original mechanical strength was recovered. Owing to the increased chain relaxation, PFS-imines can be multiply patterned by directly imprinting at the temperature above Tv. Furthermore, the pattern of PFS-imines is removable and reformed, which may be attributed to their reprocessability. Thus, PFS-imine exhibits pattern ability and recyclability, making it particularly suitable for applications in electronic packaging and circuit boards, compared with that of conventional low-dielectric resins.
研究领域:
材料科学
·
高分子化学
·
电子封装
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Fenglong Li,Zhengyang Kong,Xiaolin Wang,Guyue Wang,Chao Chen,Ying Tian,Zhiyi Lyu,Kyung Jin Lee,Do Hwan Kim,Jung-Yong Lee,Jin Zhu,Wu Bin Ying
Central Sleep Apnea (CSA) is characterized by respiratory pauses during sleep, posing risks like cardiovascular diseases, stroke and sudden death. The challenges in managing it arise from the current monitoring tools, which are often complicated and inaccurate. Furthermore, respiratory pauses leading to decreased blood oxygen can induce profuse sweating, further affecting accuracy. Herein, we have synthesized a bio-based, biocompatible and sweat-resistant polyurethane . By utilizing it as the matrix, we incorporated [BMIM] + [PF 6 ] − to fabricate a markedly sensitive dielectric material, termed i-DFPU. The fluorine groups in i-DFPU contributed to a trap-release effect for migratable ions, while the alkyl side chains provided smooth ion migration channels, endowing i-DFPU with exceptional sensitivity. In combination with a stress concentration layer and serpentine-shaped electrodes, the resultant iontronic skin exhibited a remarkable sensitivity up to 132.2 kPa −1 , operational stability and portability. Consequently, it could accurately monitor various respiratory states in CSA, potentially preventing complications such as sudden death.
研究领域:
材料科学
·
生物医学工程
·
睡眠医学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）