Nuclear Science and Techniques
·
2022
·Vol. 33
·期 8
·1-11
·
IF 2.389
Lü Zhi-Wei,Wei Gong-Xiang,Wang Han-Qiu,Guan Yu,Jiang Ning,Liu Yun-Yan,Li Zhao,Qin Hua,Liu Hui-Qiang
The evolution of lead halide perovskites used for X-ray imaging scintillators has been facilitated by the development of solution-processable semiconductors characterized by large-area, flexible, fast photoresponse. The stability and durability of these new perovskites are insufficient to achieve extended computed tomography scanning times with hard X-rays. In this study, we fabricated a self-assembled CsPbBr 3 -based scintillator film with a flexible large-area uniform thickness using a new room-temperature solution-processable method. The sensitivity and responsivity of X-ray photon conversion were quantitatively measured and showed a good linear response relationship suitable for X-ray imaging. We also demonstrated, for the first time, that the self-assembled CsPbBr 3 -based scintillator has good stability for hard X-ray microtomography. Therefore, such an inexpensive solution-processed semiconductor easily prepared at room temperature can be used as a hard X-ray scintillator and equipped with flexible CsPbBr 3 -based X-ray detectors. It has great potential in three-dimensional high-resolution phase-contrast X-ray-imaging applications in biomedicine and material science because of its heavy Pb and Br atoms.
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高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2022
·Vol. 51
·期 9
·5074-5086
·
IF 2.047
Wu Linlin,Zhou Jiacheng,Bu Ximan,Ge Yongxin,Gao Yifeng,Ma Xiaofeng
Due to the advantages of high ion density, low volatility, non-toxicity, and low cost, deep eutectic solvent gels have attracted widespread interest as novel solid-state ionic conductors for flexible devices. However, most of the currently developed deep eutectic solvent gels have weak mechanical properties, which seriously hinder their large-scale application. Herein, tough and ultrastretchable agar-based double-network deep eutectic solvent gels were successfully fabricated through the self-assembly of agar at a concentration range of 2% to 6% in a choline chloride/urea/water eutectic mixture (ChCl:urea:H 2 O = 1:2:1) by heating–cooling to form the first physical dissipative network and combination with the second Al 3+ -cross-linked hybrid poly(acrylic acid) (PAA) network. Such a double-network and multi-bond design endow the obtained 22 wt.% polymer scaffold-supported deep eutectic solvent gels with good mechanical properties (high tensile strength of 216 kPa and toughness of 2112 kJ m −3 ), stretchability (breaking strain of 1566%), good self-recovery ability (91% recovery efficiency after 600% strain deformation), and high room-temperature ionic conductivity of 2.1 mS cm −1 . Furthermore, agar-based double network deep eutectic solvent gels were successfully used as stretchable gel electrolytes for the fabrication of electric double-layer capacitors and reliable flexible sensors with excellent electrochemical performance over a wide strain range. Graphical Abstract A nonvolatile agar-based double-network gel containing a deep eutectic solvent with high toughness of 2112 kJ m −3 , high stretchability of 1595%, excellent recovery property, and ionic conductivity of 2.1 mS cm −1 is fabricated for flexible electronics by the self-assembly of agar in a choline chloride/urea/water eutectic mixture (ChCl:urea:H 2 O = 1:2:1) to form the first physical dissipative network and combination with a second Al 3+ -cross-linked hybrid PAA network.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 7
·3009-3017
·
IF 3.5
Fu Yuan,Gong Zhemin,Li Dapeng,Liu Yongxing,Zhou Xiaolong,Yang Yong,Jiao Qing
Solid electrolytes equipped battery show promise in solving energy storage and ecological concerns owing to their excellent electrical conductivity and chemical stability. Only a limited number of substances satisfy the demanding criterion of high ionic conductivity (≥ 10 −3 S/cm), while using non-toxic elements. In this work, the designed Na 3.3 Zn 0.1 Sb 0.9 S 4 electrolyte, a zinc-doped sodium sulfide ion conductor, with a maximum conductivity of 1.48 × 10 −3 S/cm under normal conditions, and a low activation energy of 0.128 eV was achieved. This was ruled by substituting low-valence Zinc for antimony in the SbS 4 3− cell, maintaining efficient ion transport pathways. Additionally, the electrolyte demonstrated strong air stability under humid conditions and emitted minimal H 2 S. The origin of heterovalent ion doping and the impact of thermal effects on electrochemical performance were discussed in detail, which were crucial to promote the development of sodium-ion solid electrolytes.
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高影响因子
KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2021
·Vol. 38
·期 5
·1032-1042
·
IF 3.309
Xu Li,Qin Yu,Liu Liying,Xiao Juntian,Ding Zhongwei
The membrane contactor has been considered an effective device to capture CO 2 , but its performance is limited by membrane wetting phenomena. In this work, the ZIF-8/ZIF-L (zeolitic imidazolate framework) based composite membrane with excellent hydrophobic stability and CO 2 permeability was successfully fabricated by coating the dense layer on the porous PVDF (polyvinylidene fluoride) substrate. The dense layer was developed by evenly incorporating ZIF-8 nanocrystals and ZIF-L nanosheets into the polydimethylsiloxane (PDMS) polymer. The as-prepared membrane possessed competitive hydrophobicity with a water contact angle (WCA) of 131.8°. And after a ten-day immersion test in CO 2 absorbent, the WCA only declined by 9.8%, exhibiting excellent hydrophobic stability. Besides, the CO 2 permeability of the composite membrane was 61.8×10 −8 ·mol·m −2 ·s −1 ·Pa −1 with an ideal CO 2 /N 2 separation factor of ∺20, which was effectively improved in comparison with the control membrane. In the CO 2 absorption experiment, the prepared membrane achieved the competitive CO 2 flux of 3.02×10 −3 ·mol·m −2 ·s −1 when the liquid velocity was 0.25 m·s −1 and displayed robust long-term operating stability. Finally, the AC impedance technique was applied to continuously monitor the wetting state of composite membranes, which further investigated their anti-wetting ability.
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高影响因子
POLYMER BULLETIN
·
2021
·Vol. 79
·期 3
·1751-1765
·
IF 2.87
Sun Yiwen,Zhai Guangqun
Since cerium(IV) ammonium nitrate (CAN) could oxidize amidyl N–H moieties into nitrogen-centered radicals under proper conditions to initiate radical polymerization, CAN-acrylamide (AAm) redox-initiated radical homo/co-polymerization in a conventional or controlled manner was exploited with AAm as an intrinsically reducing inimer. CAN oxidized AAm to initiate conventional radical homopolymerization at 50–60 °C, and viscosity-average molecular weight (MW) of polyacrylamide (PAAm) steadily increased with conversion because of the oxidation of amidyl N–H moieties of in-chain -AAm- units, but MW was in a range from 10 4 to 10 5 . CAN-AAm redox-initiated radical co-polymerization of N,N -dimethylacrylamide (DMAAm) proceeded readily under optimized conditions and formed PAAm-co-PDMAAm with MW in a range from 10 5 to 10 6 , and increasing simultaneously with conversion. CAN-AAm redox-initiated controlled radical homopolymerization was performed with FeCl 3 complexes as the deactivator, and the polymerization proceeded in a mechanism of reverse atom transfer radical polymerization (ATRP) and MW of PAAm increased in proportion to conversion. The PAAm chains contained a C–Cl terminal, which was confirmed by block co-polymerization with DMAAm via standard ATRP with PAAm as the macro-initiator.
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高影响因子
MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 1
·1-11
·
IF 5.833
Lv Yuanxia,Qin Xiaohuan,Hu Kun,Huang Yong,Zhao Shulin
A novel matrix-assisted laser desorption/ionization time-of-flight mass spectrometric method (MALDI-TOF MS) for determination of highly sensitive small molecular compounds was developed based on molybdenum disulfide nanosheets hybridized with ultrathin graphitic carbon nitride (MoS 2 /g-C 3 N 4 ) as the matrix. With this approach, the synergistic effects of MoS 2 and g-C 3 N 4 enhance the UV absorption of MoS 2 /g-C 3 N 4 , increase both desorption and ionization efficiency in LDI MS, and induce higher signal-to-noise ratio of analytes when compared with the bare MoS 2 and g-C 3 N 4 matrix in the determination of amino acids, antibiotics, neutral oligosaccharides, uric acid, and polyethylene glycols (PEGs). The detection limits of these small molecular compounds are in the ranges 0.1 to 10 μg mL −1 , 1*10 −3 to 1.0 μg mL −1 , 1.0 to 10 μg mL −1 , and 2*10 −4 μg mL −1 , respectively, and the polydispersity index of these PEGs is less than 1.02. Moreover, high salt tolera`nce and homogeneous deposition on the spot results in good reproducibility. The relative standard deviations (RSDs) of shot-to-shot and spot-to-spot ( n = 15) of these compounds are less than 10.1% and 12.5%, respectively. With MoS 2 /g-C 3 N 4 , the uric acid in complicated biological samples can be directly determined in combination with LDI-TOF MS. Graphical abstract
We synthesized MoS 2 /g-C 3 N 4 nanohybrid as an efficient matrix for MALDI-TOF MS analysis of small molecules as well as quantitative detection of uric acid in human urine.
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高影响因子
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
·
2020
·Vol. 29
·期 12
·7971-7980
·
IF 1.652
Wang Bin,Du Jinjing,Gao Shoukun,Zhou Meng,Li Erhu,Li Linbo
NiFe 2 O 4 /nano-TiN ceramics were synthesized by a two-step cold-pressing sintering process. Sintering behavior, fracture morphology, mechanical performance and high-temperature conductivity were investigated. The results indicated that besides NiO and NiFe 2 O 4 , new Ni 3 TiO 5 and metallic phases (iron and nickel) formed in the sintered samples. TiN accelerated the grain growth along with considerable quantity of micro-pores in the sintered samples. Compared to the un-doped samples, the temperature for the onset of sintering of the NiO-Fe 2 O 3 -2.0 wt.% TiN system decreased from 1093 to 985 °C. TiN addition changed the sintering mechanism of the NiO-Fe 2 O 3 from grain boundary diffusion to volume diffusion. TiN additions reduce the apparent sintering activation energy and porosities and improve the density, bending strength, and pyroconductivity. Three-dimensional fracture morphology of the composite ceramics synthesized under argon atmosphere, exhibits self-similarity characteristics and the fractal dimension for NiFe 2 O 4 -1.0 wt.% TiN ceramics is 2.0813.
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高影响因子
Nature Communications
·
2020
·Vol. 11
·期 1
·1-7
·
IF 12.121
Yu Fei-Yang,Lang Zhong-Ling,Yin Li-Ying,Feng Kun,Xia Yu-Jian,Tan Hua-Qiao,Zhu Hao-Tian,Zhong Jun,Kang Zhen-Hui,Li Yang-Guang
The oxidized platinum (Pt) can exhibit better electrocatalytic activity than metallic Pt 0 in the hydrogen evolution reaction (HER), which has aroused great interest in exploring the role of oxygen in Pt-based catalysts. Herein, we select two structurally well-defined polyoxometalates Na 5 [H 3 Pt (IV) W 6 O 24 ] (PtW 6 O 24 ) and Na 3 K 5 [Pt (II) 2 (W 5 O 18 ) 2 ] (Pt 2 (W 5 O 18 ) 2 ) as the platinum oxide model to investigate the HER performance. Electrocatalytic experiments show the mass activities of PtW 6 O 24 /C and Pt 2 (W 5 O 18 ) 2 /C are 20.175 A mg −1 and 10.976 A mg −1 at 77 mV, respectively, which are better than that of commercial 20% Pt/C (0.398 A mg −1 ). The in situ synchrotron radiation experiments and DFT calculations suggest that the elongated Pt-O bond acts as the active site during the HER process, which can accelerate the coupling of proton and electron and the rapid release of H 2 . This work complements the knowledge boundary of Pt-based electrocatalytic HER, and suggests another way to update the state-of-the-art electrocatalyst.
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高影响因子
Nature Synthesis
·
2023
·
IF 0
Chen Shiming,Liang Suxia,Huang Rui,Zhang Mo,Song Yao,Zhang Yunlong,Tao Shuo,Yu Liang,Deng Dehui
Nitric acid (HNO 3 ) synthesis is an important industrial process but typically requires multiple energy-intensive steps, including the synthesis and subsequent oxidation of ammonia. Here we report the direct conversion of air to HNO 3 under ambient conditions through a hydroxyl radical (OH · )-mediated hetero-homogeneous electrochemical route. The conversion proceeds at a reductive potential of 0 V versus the reversible hydrogen electrode at the cathode and can achieve a Faradaic efficiency of 25.37% with over 99% HNO 3 selectivity. Experimental and theoretical investigations reveal that OH · produced from Fe 2+ -induced dissociation of in situ generated H 2 O 2 can efficiently activate N 2 . This delivers a high HNO 3 productivity of \(141.83\,\upmu{\mathrm{mol}}\,{\mathrm{h}}^{-1}\,{\mathrm{g}}_{\mathrm{Fe}}^{-1}\) , which is 225 times that of directly using H 2 O 2 as the oxidant. This process opens an energy-efficient and green route for the direct conversion of air to HNO 3 under mild conditions.
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APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY
·
2022
·Vol. 194
·期 11
·5167-5184
·
IF 3.094
An Peide,Zhu Fenfen,Liu Shiji,Zhou Xiaolin,Wang Chunfang,Liu Yufeng,Meng Hao,Zhang Xia
Recently, metal–organic frameworks (MOFs) are considered to be the moderate hosts for the bio-enzymes owing to their unique 3D pores and controllable surface affinity to the target molecules. In this work, the benzoic acid (BA)–modulated UiO-66-NO 2 was introduced, and cytochrome c (Cyt C) was chosen as the target enzyme to evaluate the immobilization efficiency of the resulting UiO-66-NO 2 -BA. The immobilization conditions including pH, adsorption time, and temperature and the initial concentrations of BA were optimized. The adsorption kinetics and thermodynamics were analyzed to further explore the enhanced adsorption mechanism. It is worth noted that all the UiO-66-NO 2 -BA exhibited evidently enhanced adsorption capacities in comparison with the unmodified UiO-66-NO 2 due to the formation of the chemical bonds between the UiO-66-NO 2 -BA and cytochrome C, indicating the positive roles of BA modification. Finally, the activities of the immobilized cytochrome C were assessed by using the catalytic oxidation of ABTS in the presence of H 2 O 2 , which reactions were also conducted over the free cytochrome C for comparison. The evidently improved stability under definite pH range, prolonged durability against the organic solvents, and the good reusability of the immobilized cytochrome C highlight the prospect applications of functional MOF immobilized enzymes in the practical catalytic reactions. Graphical abstract
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Scientific Reports
·
2024
·Vol. 14
·期 1
·1-14
·
IF 3.8
Hou Tianyang,Yuan Xiaofeng,Jiang Shuaijie,Xu Ze,Zhang Xiaopeng,Lu Ming,Xu Yuangang
In this work, we realized the detection of diamino-pentazolium cation (DAPZ + ) in the reaction solution experimentally and proved it to be meta-diamino-pentazole based on the transition state theory. Quantum chemical methods were used to predict its spectral properties, charge distribution, stability and aromaticity. Considering that DAPZ + has excellent detonation properties, it was further explored by assembling it with N 5 − , N 3 − and C(NO 2 ) 3 − anions, respectively. The results show a strong interaction between DAPZ + and the three anions, which will have a positive effect on its stability. Thanks to the high enthalpy of formation and density, the calculated detonation properties of the three systems are exciting, especially [DAPZ + ][N 5 − ] ( D : 10,016 m·s −1 ; P : 37.94 GPa), whose actual detonation velocity may very likely exceed CL-20 ( D : 9773 m·s −1 ). There is no doubt that this work will become the precursor for the theoretical exploration of new polynitrogen ionic compounds.
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PubMed
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2013
·Vol. 15
·期 6
·1717
·
IF 2.175
Zhang Yan,Bu Yuyu,Yu Jianqiang,Li Ping
SrTiO 3 –TiO 2 heterojunction thin-film nanotube arrays (SNTs, the average inner diameter is about 50 nm) was fabricated via electrochemical anodization followed by a hydrothermal treatment. The photo-to-current conversion properties and the photoelectrochemical performance for cathodic protection of carbon steel in 0.5 M of sodium chloride solution under white light illumination were investigated. The results showed that the highly ordered nanotube arrays could provide very excellent cathodic protection for carbon steel under white light irradiation.
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高影响因子
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