JOURNAL OF MATERIALS RESEARCH
·
2022
·Vol. 37
·期 9
·1651-1663
·
IF 2.909
Duan Chong-Chong,Tan Guo-Long
The combination of antiferroelectricity and ferromagnetism in one structure would create new types of multiferroic candidates. Here, we propose a novel type of multiferroic candidate La x Sr 1− x Fe 12 O 19 , whose room temperature state could be tuned from ferroelectrics (FEs) to antiferroelectrics (AFEs) by changing x from 0 to 0.5. The AFE state in La 0.5 Sr 0.5 Fe 12 O 19 remains as a stable phase between − 163 and 233 °C and demonstrates double P – E hysteresis loops which are fully separated by a straight line with zero polarization. La 0.2 Sr 0.7 Fe 12 O 19 , however, exhibits a hybrid FE/AFE state. Both compounds exhibit strong ferrimagnetism. In addition, the La 0.5 Sr 0.5 Fe 12 O 19 ceramic demonstrates strong magnetoelectric coupling and giant magnetoresistance effect. A 1.1 T magnetic field generates electronic polarization of 0.95 μC/cm 2 , reduces the resistance by 117%, enhances dielectric constants by 540% and right shifts the maximum dielectric loss peak by 208 kHz. The combined functional responses provide an opportunity to develop novel multiferroic memories and energy storage devices. Graphical abstract A novel type of multiferroic candidate combines AFE and FM in one single phase of La 0.5 Sr 0.5 Fe 12 O 19 , which also presents strong ME coupling, colossal magnetodielectric (MD) and GMR effects.
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DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2014
·Vol. 22
·期 9
·6941-6949
·
IF 2.757
Wang Dingna,Zhou Sai,Liu Li,Du Liang,Wang Jianmei,Huang Zhenling,Ma Lijian,Ding Songdong,Zhang Dong,Wang Ruibing,Jin Yongdong,Xia Chuanqin
The effects of different hydroponic conditions (such as concentration of thorium (Th), pH, carbonate, phosphate, organic acids, and cations) on thorium uptake by Brassica juncea var. foliosa were evaluated. The results showed that acidic cultivation solutions enhanced thorium accumulation in the plants. Phosphate and carbonate inhibited thorium accumulation in plants, possibly due to the formation of Th(HPO 4 ) 2+ , Th(HPO 4 ) 2 , or Th(OH) 3 CO 3
− with Th 4+ , which was disadvantageous for thorium uptake in the plants. Organic aids (citric acid, oxalic acid, lactic acid) inhibited thorium accumulation in roots and increased thorium content in the shoots, which suggested that the thorium-organic complexes did not remain in the roots and were beneficial for thorium transfer from the roots to the shoots. Among three cations (such as calcium ion (Ca 2+ ), ferrous ion (Fe 2+ ), and zinc ion (Zn 2+ )) in hydroponic media, Zn 2+ had no significant influence on thorium accumulation in the roots, Fe 2+ inhibited thorium accumulation in the roots, and Ca 2+ was found to facilitate thorium accumulation in the roots to a certain extent. This research will help to further understand the mechanism of thorium uptake in plants.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 11
·8385-8397
·
IF 2.993
Zhang Hui,Zhao Yanming,Wen Mingming,Dong Youzhong,Fan Qinghua,Kuang Quan,Liu Huatao,Lian Xin
A new sodium ferrous orthophosphate Na
x
Fe 4 (PO 4 ) 3 (1.1 ≤ x ≤ 1.2) with P 2 1 / n symmetry has been successfully synthesized via a solid-state reaction for the first time. The structure consists of FeO 5 pyramids, FeO 6 octahedron, and PO 4 tetrahedra which form large six-sided tunnels along \( \vec{b} \) direction and three- or four-sided tunnels running along \( \vec{a} \) direction. When evaluated as the anode materials for sodium-ion batteries, the first discharge and charge capacities of 553 and 264 mAh g −1 for Na 1.1 Fe 4 (PO 4 ) 3 /C and 583 and 315 mAh g −1 for Na 1.2 Fe 4 (PO 4 ) 3 /C, respectively, can be obtained at 10 mA g −1 current density. Compared to the Na 1.1 Fe 4 (PO 4 ) 3 /C, Na 1.2 Fe 4 (PO 4 ) 3 /C exhibits a better cycling performance, where the charge capacity of about 100 mAh g −1 can still be maintained after 15 cycles. The electrode kinetics are investigated further by the electrochemical impedance spectroscopy.
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高影响因子
MICROCHIMICA ACTA
·
2011
·Vol. 174
·期 1
·41-46
·
IF 2.578
Wang Yinling,Peng Wei,Liu Lin,Tang Min,Gao Feng,Li Maoguo
A strategy is presented for doping graphene into layered double hydroxide films (LDHs) as a means of improving charge transport of the LDH film in a modified glassy carbon electrode. This result in an enhanced electrocatalytic current for dopamine (DA) and a good separation of the potentials of DA, uric acid and ascorbic acid. Under selected conditions, the square wave voltammetric response of the electrode to DA is linear in the concentration range from 1.0 to 199 μM even in the presence of 0.1 mM ascorbic acid, and the detection limit is 0.3 μM at a signal-to-noise ratio of 3. The method was applied to the determination of DA in pharmaceutical injections with satisfactory results.
A strategy is presented for doping graphene into layered double hydroxide films (LDHs) as a means of improving charge transport of the LDH film in a modified glassy carbon electrode. This result in an enhanced electrocatalytic current for dopamine (DA) and the square wave voltammetric response of the electrode to DA is linear in the concentration range from 1.0 to 199 μM with the detection limit of 0.3 μM. The method was applied to the determination of DA in pharmaceutical injections with satisfactory results.
研究领域:
分析化学
·
电化学
·
生物传感器
·
纳米材料
·
药物分析
·
神经化学
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DOI
高影响因子
SN Applied Sciences
·
2020
·Vol. 2
·期 7
·1246
·
IF 0
Li Bowen,Zhang Yipeng,Wang Jiashuai,Jia Zezhao,Shi Chengqian,Ma Yanqing,Ma Lei
The double-electrolyte etching method is a simple and effective way to fabricate ultra-sharp scanning tunnel microscopy (STM) tungsten tips. However, it is still challenging for this method to get ultra-sharp tungsten tips with high yield. In this work, significant enhancing of the yield is presented through optimized etching parameters as follows: temperature of 26 °C, applied voltage 7.5 V, electrolyte concentration 4 mol L −1 and length below the liquid lamellae of 2 mm. Under these conditions, the smallest tip radius is around 8 nm and the yield (radius < 10 nm) is 63.5%. These tips are capable of producing high-quality atomic resolution STM images, as demonstrated by testing on Si (111) and highly oriented pyrolytic graphite (HOPG) samples at room temperature. Furthermore, in order to find the relationship between the tip features and experimental etching parameters, an artificial neural network (ANN) model is built by machine learning. Garson’s algorithm is used to analyze the relative importance of each experimental parameter on tip features. The tip features can be estimated by this model with a correlation factor R over 0.85 indicating great predictive performance . Importance analysis indicates that the length of the tungsten wire below the liquid lamellae is the most important parameter to obtain high-quality STM tungsten tips in the double-electrolyte etching method. This result provides a clear direction for rapidly selecting optimized tip fabrication parameters in the future.
研究领域:
纳米科技
·
表面科学
·
材料表征
·
计算材料学
·
仪器与方法
·
电化学加工
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DOI
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 16
·47025-47037
·
IF 5.8
Wang Tianyu,Yang Lang,Rao Feng,Jiang Kaixi,Byrynnai Choduraa
Adding organics in the process of geopolymer synthesis can combine the functional groups of organics with the three-dimensional structure of geopolymer, thus changing the properties of geopolymer such as compressive strength, flexural strength, and acid resistance. In this work, excellent mechanical properties and acid resistance of metakaolin-blast furnance slag (Mk-BFS)-based geopolymer were synthesized by the incorporation of chitosan. The formation of sodium-alumino-silicate-hydrate (N-A-S–H) gel and calium-alumino-silicate-hydrate (C-A-S–H) gel in geopolymerization were characterized by 29 Si nuclear magnetic resonance (NMR). At 5% of chitosan, the compressive strength of Mk-BFS-based geopolymer could reach to 33.7 MPa. The results could be ascribed to that chitosan reacts with geopolymer to generate new C-O-Si structure meanwhile adhesion produced by the combination of positively charged cations and negatively charged ions makes the structure of geopolymer denser. After 7 days of sulfuric acid immersion, the reduction of compressive strength is less than 3 MPa, demonstrating its great acid resistance. The acid resistance of Mk-BFS-based geopolymer could attribute to that the free amino groups in chitosan preferentially react with acid solution and weakened the erosion of sulfuric acid. This study optimizes the compressive strength and acid resistance of geopolymer by adding appropriate amount of chitosan.
研究领域:
材料科学
·
硅酸盐化学
·
无机非金属材料
·
功能复合材料
·
建筑材料
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 10
·9983-9988
·
IF 2.195
Ma Panfei,Zhang Huimin,Chen Mingxing,Liu Ting,Chang Aimin,Su Zhi
Highly dense LaCrO 3 negative temperature coefficient (NTC) thermistor ceramics by low-heating solid-state method have been successfully synthesized in air ambient. The X-ray diffraction analysis has shown that both of the calcined powders and as-sintered ceramics crystallize in a perovskite structure. The relative densities of the ceramics synthesized by Cr(NO 3 ) 3 ·9H 2 O and the ceramics synthesized by CrCl 3 ·6H 2 O are 91% and 65%, respectively. The relationship between lnρ and 1000/T shows an approximate line in the measured temperature range. The values of ρ 25 and B 0/25 of the ceramics synthesized by Cr(NO 3 ) 3 ·9H 2 O and the ceramics synthesized by CrCl 3 ·6H 2 O are 424.8 Ω cm, 3252 K and 1835.9 Ω cm, 3636 K, respectively.
研究领域:
材料科学
·
无机非金属材料
·
电子陶瓷
·
热敏材料
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DOI
高影响因子
Food Analytical Methods
·
2015
·Vol. 9
·期 7
·2026-2035
·
IF 1.956
Du Jiaojiao,Gao Ruixia,Mu Hui
Phthalates represent a potential risk for humans, since they are ubiquitous environmental contaminants. Efficient extraction and purification procedures are demanded for the detection of low concentration levels of phthalates. In this work, a novel type of molecularly imprinted polymers coated onto the surface of vinyl functionalized multi-walled carbon nanotubes was synthesized and coupled with gas chromatography–mass spectrometry (GC/MS) for the selective separation and determination of dioctyl phthalate (DOP) in beverage samples. The morphology, structure property, and thermostability of the resultant polymers were characterized by transmission electron microscopy, Fourier transform infrared spectroscopy, and thermogravimetric analysis. The adsorption properties of the prepared polymers were investigated by equilibrium rebinding and competitive experiments. The resultant imprinted nanomaterials exhibited high capacity and favorable selectivity. In addition, the feasibility of the developed method using the obtained imprinted polymers as a solid-phase sorbent coupled with GC/MS for the selective isolation and determination of DOP in different beverage samples was demonstrated. Under optimal conditions, the limit of detection of the proposed method for DOP was 2.3 ng L −1 . DOP spiked at three levels of concentration in beverage samples was extracted and determined through the application of the present method, with recoveries ranging from 88.6 to 93.0 % with relative standard deviations less than 5.6 %.
研究领域:
分析化学
·
环境毒理学
·
食品安全
·
分子识别
·
材料科学
·
色谱分析
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DOI
高影响因子
IONICS
·
2020
·Vol. 26
·期 8
·3823-3830
·
IF 2.394
Zhang Jun-Hong,Yue Haoguo,Ma Yueqiang,Han Xiao,Mei Jie,Zhao Jinsheng,Li Yan-Mei,Zhu Yan-Rong
In this work, the spherical NiO-NiMoO 4 composite was synthesized by solvothermal route followed by calcination, and then spherical NiO-NiMoO 4 /PPy composite was synthesized by in situ polymerization of pyrrole monomer. The NiO-NiMoO 4 and NiO-NiMoO 4 /PPy microspheres with a particle size of around 1–2 μm consist of nanorods and nanosheets. Hence, NiO-NiMoO 4 /PPy anode shows a higher delithiation and lithiation capacities than NiO-NiMoO 4 at each rate. At 0.2 A g −1 , NiO-NiMoO 4 only shows an initial delithiation capacity of ∼775 mAh g −1 , and the capacity only keeps 207 mAh g −1 after 160 cycles. Nonetheless, NiO/NiMoO 4 /PPy shows an initial delithiation capacity of ~ 884 mAh g −1 , and the capacity also maintains ~ 846 mAh g −1 even after 160 cycles. The corresponding capacity retention of NiO/NiMoO 4 /PPy and NiO/NiMoO 4 are 95.7% and 26.7%, respectively. The PPy modification is a direct and effective strategy to improve the reversible capacity and cycling performance of NiO-NiMoO 4 composite.
研究领域:
材料科学
·
储能
·
电化学
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DOI
高影响因子
Science China-Materials
·
2021
·Vol. 64
·期 9
·2251-2260
·
IF 8.273
Liu Guiheng,Su Jianwei,Feng Xin,Li Huiqiao,Zhai Tianyou
Manganese phosphorous selenium (MnPSe 3 ), as a representative of layered metal phosphorus trichalcogenides (MPTs), has gained significant attention due to its direct bandgap, high carrier mobility, large absorption coefficient, which indicate great potential in photoelectric application. Herein, high-quality two-dimensional (2D) MnPSe 3 flakes were mechanically exfoliated from the corresponding bulk crystals synthesized by chemical vapor transport (CVT) methods. The systematic investigation was applied to the lattice vibrations of MnPSe 3 via angle-resolved polarized Raman spectroscopy (ARPRS), and the Raman vibration modes were determined based on Raman selection rules and crystal symmetry. Impressively, the photodetectors based on 2D MnPSe 3 flakes exhibit excellent photoresponse to the ultraviolet light with a responsivity up to 22.7 A W −1 and a detectivity of 2.4 × 10 11 Jones. The high performance in the ultraviolet range signifies that 2D MnPSe 3 is expected to be a powerful candidate for future ultraviolet photodetection.
研究领域:
材料科学
·
纳米技术
·
光电子学
·
固态物理
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DOI
高影响因子
JOM
·
2017
·Vol. 69
·期 10
·1963-1969
·
IF 1.86
Xie Kaiyu,Shi Zhongning,Xu Junli,Hu Xianwei,Gao Bingliang,Wang Zhaowen
Aluminothermic reduction-electrolysis using an inert anode process is proposed to extract oxygen and metals from Minnesota Lunar Simulant-1 (MLS-1). Effective aluminothermic reduction between dissolved MLS-1 and dissolved metal aluminum was achieved in cryolite salt media. The product phases obtained by aluminothermic reduction at 980°C for 4 h were Al, Si, and Al 5 FeSi, while the chemical components were 79.71 mass% aluminum, 12.03 mass% silicon, 5.91 mass% iron, and 2.35 mass% titanium. The cryolite salt containing Al 2 O 3 was subsequently electrolyzed with Fe 0.58 -Ni 0.42 inert anode at 960°C for 4 h. Oxygen was evolved at the anode with an anodic current efficiency of 78.28%. The results demonstrate that this two-step process is remarkably feasible for the extraterrestrial extraction of oxygen and metals. This process will help expand the existing in situ resource utilization methods.
研究领域:
空间资源利用
·
提取冶金
·
电化学
·
月球探测
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DOI
高影响因子
Nature Communications
·
2026
·
IF 15.7
Lai Dingbo,Yu Jia,Ma Zi-Ang,Ye Xiaolin,Wang Chaoxi,Zhang Junqing,Wang Tuo,Zhao Zhi-Jian,Zhang Peng,Gong Jinlong
The electrochemical C–N coupling of biomass-derived 5-hydroxymethylfurfural (HMF) with methylamine offers a promising sustainable route to value-added amines. However, achieving high selectivity remains challenging due to competing side reactions, including C = O hydrogenation and C–C dimerization. This paper describes tailoring the surface structure of Ag catalysts to modulate HMF adsorption and intermediate hydrogenation behavior and thus enhancing C–N coupling selectivity. Ag nanoparticles, predominantly exposing the (111) facet, exhibit higher selectivity compared with Ag nanocubes mainly enclosed by (100) planes. The Ag(111) facet favors the C–N coupling pathway by regulating both adsorption geometry and hydrogenation ability. In-situ Raman spectroscopy and density functional theory (DFT) calculations reveal that an η 1 (C)-aldehyde adsorption configuration, dominant on Ag(111), enhances carbonyl electrophilicity and facilitates C = O polarization, promoting nucleophilic attack by methylamine. In contrast, the η 2 (C,O)–aldehyde configuration, more common on Ag (100), stabilizes the C = O bond, limiting its reactivity. Moreover, Ag(111) shows enhanced imine hydrogenation activity, further improving amine selectivity. This study highlights the significance of facet-dependent adsorption modulation in steering reaction pathways and advancing sustainable electrochemical synthesis.
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