Nature Communications
·
2023
·Vol. 14
·期 1
·1-13
·
IF 16.6
Xie Xinjian,Xu Zhonggang,Yu Xin,Jiang Hong,Li Hongjiao,Feng Wenqian
Conductive hydrogels require tunable mechanical properties, high conductivity and complicated 3D structures for advanced functionality in (bio)applications. Here, we report a straightforward strategy to construct 3D conductive hydrogels by programable printing of aqueous inks rich in poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) inside of oil. In this liquid-in-liquid printing method, assemblies of PEDOT:PSS colloidal particles originating from the aqueous phase and polydimethylsiloxane surfactants from the other form an elastic film at the liquid-liquid interface, allowing trapping of the hydrogel precursor inks in the designed 3D nonequilibrium shapes for subsequent gelation and/or chemical cross-linking. Conductivities up to 301 S m −1 are achieved for a low PEDOT:PSS content of 9 mg mL −1 in two interpenetrating hydrogel networks. The effortless printability enables us to tune the hydrogels’ components and mechanical properties, thus facilitating the use of these conductive hydrogels as electromicrofluidic devices and to customize near-field communication (NFC) implantable biochips in the future.
研究领域:
材料科学
·
生物医学工程
·
纳米技术
·
电气工程
✓ 已验证
DOI
PubMed
高影响因子
Frontiers of Chemical Science and Engineering
·
2021
·Vol. 15
·期 5
·1312-1321
·
IF 4.204
Wang Wei,Lv Haijun,Du Juan,Chen Aibing
In this present work, N-doped carbon nanobelts (N-CNBs) were prepared by a confined-pyrolysis approach and the N-CNBs were derived from a polypyrrole (Ppy) tube coated with a compact silica layer. The silica layer provided a confined space for the Ppy pyrolysis, thereby hindering the rapid overflow of pyrolysis gas, which is the activator for the formation of carbonaceous materials. At the same time, the confined environment can activate the carbon shell to create a thin wall and strip the carbon tube into belt morphology. This process of confined pyrolysis realizes self-activation during the pyrolysis of Ppy to obtain the carbon nanobelts without adding any additional activator, which reduces pollution and preparation cost. In addition, this approach is simple to operate and avoids the disadvantages of other methods that consume time and materials. The as-prepared N-CNB shows cross-linked nanobelt morphology and a rich porous structure with a large specific surface area. As supercapacitor electrode materials, the N-CNB can present abundant active sites, and exhibits a specific capacitance of 246 F·g −1 , and excellent ability with 95.44% retention after 10000 cycles. This indicates that the N-CNB is an ideal candidate as a supercapacitor electrode material.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 4
·1-8
·
IF 5.479
Qu Fengdong,Zhang Shendan,Zhang Bingxue,Zhou Xinxin,Du Shiyu,Lin Cheng-Te,Ruan Shengping,Yang Minghui
Hierarchical Co 3 O 4 @NiMoO 4 core-shell nanowires (NWs) were synthesized utilizing a two-step hydrothermal method. The NWs show a high chemiresistive response (at a temperature of 255 °C) to xylene, with an R gas /R air ratio of 24.6 at 100 ppm xylene, while the response towards toluene, benzene, ethanol, and acetone, CO, H 2 S and NO 2 is much weaker. In contrast, pure Co 3 O 4 nanowires exhibit weak responses to all the vapors/gases and poor selectivity. The new NW sensor displays an almost linear response (1–100 ppm) to xylene and a lower detection limit of 424 ppb. The remarkable gas sensing characteristics are attributed to the synergistic catalytic effect and the formation of a heterostructure between Co 3 O 4 and NiMoO 4 .
Schematic presentation of a xylene vapor chemiresistive sensor based on Co3O4@NiMoO4 core-shell nanowires. The Co3O4@NiMoO4 core-shell nanowires-based sensor exhibits a high response (24.6) to 100 ppm xylene at 255 °C and high response/recovery speed (13–15 and 25–29 s).
研究领域:
材料科学
·
化学传感器
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2019
·Vol. 35
·期 4
·549-555
·
IF 1.071
Lu Xue,Liu Guocheng,Wang Xiang,Lin Hongyan,Wang Xiuli
We synthesized three new Ni(II) coordination polymers [Ni(L)(HIP)(H 2 O) 2 ]H 2 O(CP 1 ), [Ni(L)(NIP)]·2H 2 O(CP 2 ) and [Ni(L)(NDC)(H 2 O) 2 ](CP 3 )[L= N , N' -bis(pyridine-3-yl)thiophene-2,5-dicarboxamide, H 2 HIP=5-hydroxyisophthalic acid, H 2 NIP=5-nitroisophthalic acid, H 2 NDC=2,6-naphthalenedicarboxylic acid] by hydrothermal method, which were characterized by means of infrared spectra(IR), TG analyses, PXRD and single-crystal X-ray diffraction. The CP 1 is a 1D tubular structure based on [Ni-HIP] 2 loops and pairs of L ligands. CP 2 is a 2D 3,5-connected architecture, which consists of Ni-L linear chains and (Ni-NIP) 2 double chains. CP 3 is a 2D network, which features 4-connected topology. Solid-state luminescent behaviours of CP 1 —CP 3 were investigated. The CP 1 can detect Fe 3+ ions through luminescence quenching. The electrochemical properties of CP 1 buk-modified carbon paste electrode(CP 1 -CPE) has also been investigated, which has bifunctional electrocatalytic activity for oxidation of ascorbic acid and reduction of NO 2 − .
研究领域:
材料化学
·
配位化学
·
分析化学
✓ 已验证
DOI
高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
·
2019
·Vol. 29
·期 6
·2124-2132
·
IF 1.637
Wang Zirui,Wang Xinyu,Li Jingfang,Li Weizuo,Li Guangming
In this work, a facile and fast luminescence sensing platform for the ratiometric detection of hydrogen sulfide (H 2 S/HS − ) has been constructed by encapsulating the Eu 3+ /β-diketone chromophore into the host framework of MIL-140 (Eu 3+ /TFA@MIL-140C, TFA = 1,1,1-Trifluoro-2,4-pentanedione). It is well known that the energy transfer from the host framework or/and TFA to the Eu 3+ ions can be disturbed easily by some metal ions, such as Cu 2+ ions. Therefore, the ratiometric sensor was constituted with the Eu 3+ /β-diketone moiety as the response signal and the host framework moiety as the reference signal. Furthermore, on the basis of the hard–soft acid–base theory, the Cu 2+ ions could be rapidly caught by HS − , profiting from the low solubility of CuS, realizing the real-time detection by luminescence color change. This sensor shows remarkable property on the detection of H 2 S (HS − in water solution) with low limit of detection (LOD = 7.43 μM) and short response time (< 0.5 min). The good linearity between luminescent intensity and concentration makes the luminescent ratio meter feasible.
研究领域:
材料科学
·
分析化学
·
环境科学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2017
·Vol. 24
·期 11
·10685-10694
·
IF 2.741
Yu Ying,Wang Wei,Shi Jing,Zhu Siyi,Yan Yachen
The presence of antibiotics in the environment has attracted considerable attention due to their toxicity. In this study, agricultural waste corn bracts (CBs) modified by zirconium cations were utilized to remove levofloxacin (LEV) from wastewater. Zr-modified CBs exhibited a strong adsorption capacity (Q max = 73 mg/g), and their desorption rate could reach 89% by simply adjusting the pH to 11. FTIR and XPS analyses indicated that the mechanism of LEV adsorption included the complexation between the ketone/carboxyl groups of LEV and the Zr atoms and the π-π electron-donor-acceptor interaction. Zr-modified CBs are economic, effective and nontoxic adsorbents. This material not only removes antibiotics from wastewater but also enables recycling and reuse of agricultural waste.
研究领域:
环境科学
·
生物化学
✓ 已验证
DOI
PubMed
高影响因子
Chemistry of Heterocyclic Compounds
·
2017
·Vol. 53
·期 1
·42-45
·
IF 0.865
Yu Xueying,Wang Kangnan,Cao Duxia,Wu Qianqian,Guan Ruifang,Xu Yongxiao,Sun Yatong,Liu Zhiqiang
A benzothiazolium salt containing carbazole group has been synthesized in a good yield via simple condensation reaction. Its photophysical properties and affinity for cyanide anion (tetrabutylammonium cyanide) have been investigated. The compound exhibited quick and well visible UV/Vis absorption and fluorescence responses to cyanide anion in MeCN, as the yellow color faded and the orange fluorescence disappeared. The in situ analysis by 1H NMR indicated that the cyanide anion was added to the C=N bond in the benzothiazolyl group.
研究领域:
分析化学
·
光化学
·
有机化学
✓ 已验证
DOI
高影响因子
POWDER METALLURGY AND METAL CERAMICS
·
2022
·Vol. 61
·期 3
·221-229
·
IF 0.913
Liang Dong,Xiong Sang,Zhang Xiaojuan,Lin Qing
Tungsten oxide is widely used in the photolysis of water for hydrogen production, photocatalysis, photoelectric conversion, and electrochromism. Eu 3+ doped tungsten trioxide nanoparticles were prepared by hydrothermal method with the addition of sodium tungstate (NaWO 4 · 2H 2 O). Two different samples were obtained at the temperature set at 160 and 180°C. The third sample obtained from ammonium paratungstate ((NH 4 ) 10 H 2 (W 2 O 7 ) 6 ) was used at the temperature of 160°C. The samples’ morphology, structure, and optical performance were then observed and analyzed. The results show that a rod-like structure of WO 3 : Eu 3+ nanoparticle with a monoclinic crystal system can be successfully generated using sodium tungstate. A spherical structure of WO 3 : Eu 3+ nanoparticle with a triclinic crystal system was prepared using ammonium paratungstate. The finished sample with ammonium paratungstate at a reaction temperature of 160°C has the smallest grain average size of 45.98 nm and Eu 3+ ions successfully doped. Under the excitation of different wavelengths, the three samples demonstrate pronounced emission peaks at around 615 nm, corresponding to the 5D 0 → 7F 2 electronic transition of Eu 3+ . Using ammonium paratungstate as the tungsten source, the prepared WO 3 : Eu 3+ nanoparticle at 160°C has the highest luminous intensity. The luminescence intensity of the prepared WO 3 : Eu 3+ nanoparticle from ammonium paratungstate as a tungsten source is higher than the other two samples obtained from sodium tungstate as a tungsten source at two temperatures. However, the three samples with excitation wavelength λ = 254 nm were monitored at the wavelength of 615 nm. All three samples exhibited the most substantial excitation peaks at about 508 nm, which belonged to the electron transition in 4f of Eu 3+ .
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
MACROMOLECULAR RESEARCH
·
2020
·Vol. 28
·期 5
·494-500
·
IF 2.047
Guo Xichao,Xiong Xuhai,Ren Rong,Chen Ping
In Part I of the paper, we have focused on the synthesis, characterization and solubility of three chain-extended bismaleimides containing aryl-ether-imide and phthalide cardo skeleton with different molecular weight (MPEIBMI-2.0, MPEIBMI-1.5 and MPEIBMI-1.25) and the thermal stability and thermal mechanical properties of their cured resins. In Part II of the paper, their high-temperature static viscoelasticity, shape memory (SM) performance and self-repairing behavior for micro-damages were investigated by dynamic mechanical analyzer and optical microscope. The creep test results exhibit the MPEIBMI-2.0 cured film has the strongest creep resistance at the same testing temperature due to the highest stiffness of its network structure, and the maximum allowable load of MPEIBMI-1.25 film at 200 °C reaches 15 MPa for 60 min creep experiment. The rate of stress relaxation for MPEIBMI-1.25 film is slower in spite of having relatively lower stress level. The MPEIBMI-1.25 film has the largest ultimate elongation at high temperature and this deformability confers it excellent shape memory (SM) ability. The shape fixity ratio reaches above 98% and the recovery rate is increased to above 96% from 94.5% after one SM cycle. The micro-damages on the surface of cured films could be repaired when heated to the temperature above their glass transition temperature, and the repairing temperature is increased with their crosslinking density to obtain perfect repairing efficiency.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY
·
2020
·Vol. 106
·期 1
·126-133
·
IF 1.657
Zhang Liyang,Xiao Jian,Ji Junfeng,Liu Yuanyuan
Adsorption of arsenate, a common soil contaminant, on natural occurring iron oxides controls arsenate adsorption on soils, especially on iron rich soils. However, soils contain multiple iron minerals and their contributions for arsenate adsorption on the bulk soil are unclear. In this study, Wenzel’s sequential extraction procedure (SEP) was used to characterize different fractions of iron oxides in the paddy soils from Guangxi, China. Soils treated with different extractants in the SEP (i.e. soils contained different iron fractions) were used to study arsenate adsorption on different iron fractions in the soil. Langmuir model was used to assess arsenate adsorption capacities of those iron fractions. The results showed that though amorphous iron made up only 16% of the total iron in the soil, it accounted for 82% of the soil adsorption capacity. Besides, arsenate adsorption capacity on the soils could be estimated by linear addition of arsenate adsorption capacity on the amorphous iron oxides fraction and that on the other iron oxides fraction. This study implied a possibility to use iron fractions characterized by Wenzel’s SEP to evaluate arsenate adsorption on the bulk soils.
研究领域:
土壤学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
MEDICINAL CHEMISTRY RESEARCH
·
2023
·Vol. 32
·期 5
·899-909
·
IF 2.6
Ye Zhen,Zhao Tong-Shi-Yao,Li Shan-Bin,Zhou Xian-Li,Luo Qin,Qin Jiang-Ke,Liang Cheng-Qin,Wang Ping,Ge Guang-Bo
Previous in vivo and in vitro studies revealed that esculetin (Fig. 1 ) has anti-hepatitis B virus (anti-HBV) activity as well as a protective effect on liver damage caused by duck hepatitis B virus. We designed and synthesized a series of esculetin derivatives, introduced side chains containing various amino groups into site 7 of the parent structure, and synthesized C-4 and C-8 substituted derivatives with the goal of investigating their anti-HBV activities. In vitro anti-HBV activity was performed against HepG2.2.15 cells by using Enzyme-Linked Immunosorbent Assay(ELISA) kit and cytotoxicity was determined by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide (MTT) assay with lamivudine as the positive control. The results demonstrated that several compounds showed moderate anti-HBV activity, while the introduction of morpholine groups could significantly inhibit the expression of hepatitis B e antigen (HBeAg) and the introduction of the 2-methylimidazole group could significantly inhibit the expression of Hepatitis B surface antigen (HBsAg). Among all tested compounds, compound 4a demonstrated the best anti-HBeAg activity (IC 50 = 15.8 ± 4.2 μM), while compound 6d demonstrated the best anti-HBsAg activity (IC 50 = 21.4 ± 2.8 μM). Compounds 6b and 6c showed moderate anti-HBV activity and HBsAg inhibition. Compounds 4b showed moderate anti-HBV activity and an inhibitory effect on HBeAg. In addition, compounds 4a , 4c , 4d , 6b , 6c and 6d showed improved metabolic stability. This study provides useful guidance for the discovery of anti-HBV drugs, which merits further investigation. Graphical Abstract
研究领域:
药理学
·
病毒学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2017
·Vol. 22
·期 3
·761-771
·
IF 2.316
Zeng Dongrong,Huang Jilin,Lin Zhipeng,Yu Xiang,Zhan Yunfeng,Xie Fangyan,Zhang Weihong,Chen Jian,Meng Hui
A non-noble metal Fe/N/C catalyst is prepared by pyrolyzing the ball-milled mixture of graphitized carbon ribbon, iron precursor, and nitrogen precursor in ammonia. The Fe/N/C catalyst shows high ORR activity in alkaline solution, together with much improved stability compared with Pt/C catalyst. In the catalyst, FeN particles are covered by graphitic carbon layers. The activity is proposed to originate from the FeN and Fe/N/C sites. The stability is explained by the protecting effect of the carbon layers surrounding the FeN particles. The ORR mechanism on the Fe/N/C catalyst is proposed to be similar with Pt/C catalyst based on the Tafel plots. The Fe/N/C catalyst shows great potential in ORR in alkaline solution, while the performance in acid still needs improvement.
研究领域:
材料科学
·
电化学
·
能源科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）