JOURNAL OF POROUS MATERIALS
·
2024
·Vol. 31
·期 3
·1043-1051
·
IF 2.5
Zhang Zhengxin,Zhang Deqi,Yang Li,Hou Ming,Gao Jiyun,Xia Yi,Guo Shenghui
Modifying with rare earth elements has been proven to be an effective means of enhancing the gas-sensing properties of oxides. In this work, Gd-In 2 O 3 based sensor was developed, which showed high response to 100 ppm xylene gas ( \({R}_{a}/{R}_{g}\) = 17.8) fast response time (11 s) at 350 °C, this response value was 5.4 times higher compared to the unmodified In 2 O 3 sensor ( \({R}_{a}/{R}_{g}\) =3.3). The introduction of the rare earth element not only improves the electrical properties of the sensitive material to provide a more suitable resistance but also strengthens the gas adsorption ability and the catalytic effect on the surface of the sensitive material, leading to enhanced sensing performance.
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高影响因子
International Journal of Minerals Metallurgy and Materials
·
2024
·Vol. 32
·期 1
·191-200
·
IF 5.6
Chen Chen,Xue Hongyu,Hu Qilin,Wang Mengfan,Shang Pan,Liu Ziyan,Peng Tao,Zhang Deyang,Luo Yongsong
Transition metal sulfides have great potential as anode materials for sodium-ion batteries (SIBs) due to their high theoretical specific capacities. However, the inferior intrinsic conductivity and large volume variation during sodiation–desodiation processes seriously affect its high-rate and long-cycle performance, unbeneficial for the application as fast-charging and long-cycling SIBs anode. Herein, the three-dimensional porous Cu 1.81 S/nitrogen-doped carbon frameworks (Cu 1.81 S/NC) are synthesized by the simple and facile sol–gel and annealing processes, which can accommodate the volumetric expansion of Cu 1.81 S nanoparticles and accelerate the transmission of ions and electrons during Na + insertion/extraction processes, exhibiting the excellent rate capability (250.6 mAh·g −1 at 20.0 A·g −1 ) and outstanding cycling stability (70% capacity retention for 6000 cycles at 10.0 A·g −1 ) for SIBs. Moreover, the Na-ion full cells coupled with Na 3 V 2 (PO 4 ) 3 /C cathode also demonstrate the satisfactory reversible specific capacity of 330.5 mAh·g −1 at 5.0 A·g −1 and long-cycle performance with the 86.9% capacity retention at 2.0 A·g −1 after 750 cycles. This work proposes a promising way for the conversion-based metal sulfides for the applications as fast-charging sodium-ion battery anode.
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JOURNAL OF SOLUTION CHEMISTRY
·
2015
·Vol. 44
·期 12
·2383-2392
·
IF 1.177
Zhou Li,Liu Chunli,Fan Liqun,Wang Jinhu,Wang Shumin
Enthalpies of solution and densities of diglycine in aqueous solutions of LiNO 3 , NaNO 3 and KNO 3 were measured at 298.15 K. Transfer enthalpies ( \( \Delta_{\text{tr}} H \) ) and transfer partial molar volumes ( \( \Delta_{\text{tr}} V_{\phi }^{0} \) ) were derived for diglycine. The transfer enthalpies of diglycine from water to the three alkali metal nitrates solutions are negative while the transfer partial molar volume values are positive. The absolute values of \( \Delta_{\text{tr}} H \) and \( \Delta_{\text{tr}} V_{\phi }^{0} \) from water to the same concentration in salt solutions in both cases vary in the relative order LiNO 3 < KNO 3 < NaNO 3 . The results are discussed in terms of electrostatic interaction and structural interactions. Electrostatic interaction between the diglycine zwitterion and salts gives large contributions to Δ tr
H and \( \Delta_{\text{tr}} V_{\phi }^{0} \) . But, structursal interaction is responsible for the abnormal behavior of diglycine in aqueous LiNO 3 solutions.
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MICROCHIMICA ACTA
·
2015
·Vol. 183
·期 2
·791-797
·
IF 3.741
Huang Su-Su,Liu Li,Mei Li-Ping,Zhou Jia-Ying,Guo Fei-Ying,Wang Ai-Jun,Feng Jiu-Ju
Bimetallic gold-copper nanochain networks (AuCu NCNs) were prepared by a single-step wet-chemical approach using metformin as a growth-directing agent. The formation mechanism was investigated in detail, and the AuCu NCNs were characterized by transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD). The nanocrystals were deposited on glassy carbon electrode and this resulted in a highly sensitive sensor for nitrite. Features include a low working potential (best at 0.684 V vs . SCE), fair sensitivity (17.55 μA mM −1 ), a wide linear range (0.01 to 4.0 mM), a low detection limit (0.2 μM, S/N = 3), and superior selectivity as compared to other sensors.
Gold-copper nanochain networks were prepared by a metformin-assisted one-pot wet-chemical method. The nanocrystals were used to fabricate a nitrite sensor with low detection limit, high selectivity, good reproducibility and stability.
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International Journal of Minerals Metallurgy and Materials
·
2022
·Vol. 29
·期 11
·2012-2019
·
IF 3.85
Hu Weiqiang,Gong Fengming,Liu Shaocun,Tan Jing,Chen Songhua,Wang Hui,Ma Zongqing
The oxide dispersion strengthened Mo alloys (ODS-Mo) prepared by traditional ball milling and subsequent sintering technique generally possess comparatively coarse Mo grains and large oxide particles at Mo grain boundaries (GBs), which obviously suppress the corresponding strengthening effect of oxide addition. In this work, the Y 2 O 3 and TiC particles were simultaneously doped into Mo alloys using ball-milling and subsequent low temperature sintering. Accompanied by TiC addition, the Mo−Y 2 O 3 grains are sharply refined from 3.12 to 1.36 µm. In particular, Y 2 O 3 and TiC can form smaller Y−Ti−O−C quaternary phase particles (∼230 nm) at Mo GBs compared to single Y 2 O 3 particles (∼120 nm), so as to these new formed Y−Ti−O−C particles can more effectively pin and hinder GBs movement. In addition to Y−Ti−O−C particles at GBs, Y 2 O 3 , TiO x , and TiC x nanoparticles (<100 nm) also exist within Mo grains, which is significantly different from traditional ODS-Mo. The appearance of TiO x phase indicates that some active Ti within TiC can adsorb oxygen impurities of Mo matrix to form a new strengthening phase, thus strengthening and purifying Mo matrix. Furthermore, the pure Mo, Mo−Y 2 O 3 , and Mo−Y 2 O 3 −TiC alloys have similar relative densities (97.4%–98.0%). More importantly, the Mo−Y 2 O 3 −TiC alloys exhibit higher hardness (HV 0.2 (425 ± 25)) compared to Mo−Y 2 O 3 alloys (HV 0.2 (370 ± 25)). This work could provide a relevant strategy for the preparation of ultrafine Mo alloys by facile ball-milling.
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Journal of Central South University
·
2023
·Vol. 30
·期 10
·3187-3196
·
IF 4.4
Li Cheng,Xin Rui-feng,Jiao Chen-yin,Zhang Ze-juan,Qin Jia-ze,Chu Wen-long,Zhou Xi-long,Li Zi-an,Wang Zeng-hui,Xia Juan,Zhou Yu
Twisted bilayer transition metal dichalcogenides including MoS 2 have attracted great interest due to their unique Moiré superlattice induced electronic flat bands. High-quality twisted bilayer TMDs with uniform Moiré potentials are essential for the discovery of strong correlation effects, unconventional superconductivity, and quantum anomalous Hall effect. However, the synthesis of large-area high-quality twisted bilayer MoS 2 (tBMoS 2 ) using chemical vapor deposition (CVD) is still absent, which needs to overcome the formation energy barrier for nonstable twist bilayers. Here, we demonstrate a novel CVD approach with local airflow perturbation for growing tBMoS 2 by a heterosite nucleation strategy, which enables the nucleation of the second layer at the different site from the first layer nucleation site with arbitrary twist angles. Furthermore, the accurate determination of interlayer twist angles in tBMoS 2 is crucial for studying structure-physical properties relationship. We quantitatively compare the measurement accuracy between a geometrical method and TEM selected area electron diffractions (SAED), in which the measured angles from TEM-SAED shows much smaller angle errors. Finally, Raman spectra show the interlayer coupling can be tuned by the twist angles. Our study opens an avenue for the controllable growth of tBMoS 2 for both fundamental research and practical applications.
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JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2013
·Vol. 68
·期 1
·19-30
·
IF 1.66
Liu Rong,Han Xiangna,Huang Xiao,Li Weidong,Luo Hongjie
Tetraethoxysilane (TEOS) is the most commonly used silicon-based stone consolidant in art conservation. However, it is known that the resulting silica gel phase tends to develop cracks inside the stone as the gel shrinks during aging and drying. Such phenomenon may lead to severe damage to the protected objects. By introducing silica nanoparticles into TEOS, a so-called particle modified consolidant (PMC), may minimize such shrinkage by reducing the volume loss and forming mesoporous structure to weaken the capillary forces. But many previous results show significant color changes on the surface of PMC-treated stones which can not be tolerated in the conservation treatments of cultural heritage. In this work, we designed a three-component composite consolidant which consists of 15 nm silica particles, α,ω-hydroxyl-terminated polydimethylsilane (PDMS-OH) and TEOS. Among the three components, TEOS provides the consolidation function, silica nanoparticles prevent the cracking and increase the salt resistance and PDMS-OH further reduces cracking, decreases the color alteration and increases the resistance to wetting of the stone. Experimental results show that the three components have significant synergistic effect, which makes the material exhibiting best overall performance in terms of cultural heritage protection.
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COLLOID AND POLYMER SCIENCE
·
2016
·Vol. 294
·期 8
·1359-1367
·
IF 1.89
Yu Fengyang,Fang Yi,Wang Jingjing,Xu Yanling,Shi Jun
Microcapsules with smooth, transparent, and compact walls used for electrophoretic displays (EPDs) were prepared and characterized. The approach to fabricate EPD microcapsules was based on templating an oil-in-water emulsion stabilized by monodispersed poly(methyl methacrylate- co -butyl methacrylate- co -acrylic acid) latex particles synthesized by dispersion polymerization. The individual latex particles were then transformed into robust capsule walls by successively using solvent swelling, covalent cross-linking, and sintering. The diameter of the emulsion droplets was controlled by changing the concentration of latex in the emulsion, and the thickness of the wall changed according to the diameter of the latex particles. These microcapsules for EPDs were applied successfully in preparing a clock display panel controlled by a single-chip microprocessor operated at a low direct current voltage, demonstrating that these microcapsules can be used in EPDs.
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Nano Research
·
2024
·Vol. 17
·期 6
·5251-5260
·
IF 9.5
Fang Chang,Huang Kangsheng,Zhao Jing,Tian Shiqi,Dou Hui,Zhang Xiaogang
Despite the high energy density of lithium metal batteries (LMBs), their application in rechargeable batteries is still hampered due to insufficient safety. Here, we present a novel flame-retardant solid-state electrolyte based on polyvinylidene fluoridehexafluoropropylene (PVDF-HFP) with nano SiO 2 aerogel as an inert filler but Li 6.4 La 3 Zr 1.4 Ta 0.6 O 12 (LLZTO) as an auxiliary component to enhance the ion conductivity. The introduction of SiO 2 aerogels imparts the polymer electrolyte with exceptional thermal stability and flame retardancy. Simultaneously, the interaction between hydroxyl groups of SiO 2 particles and PVDF-HFP creates a strong cross-linking structure, enhancing the mechanical strength and stability of the electrolyte. Furthermore, the presence of SiO 2 aerogel and LLZTO facilitates the dissociation of lithium salts through Lewis acid-base interactions, resulting in a high ionic conductivity of 1.01 × 10 − 3 S·cm − 1 and a wide electrochemical window of ∼ 5.0 V at room temperature for the prepared electrolytes. Remarkably, the assembled Li|Li cell demonstrates the excellent resistance to lithium dendrite and runs stablly for over 1500 h at a current density of 0.25 mA·cm −2 . Thus, we prepare a pouch cell with high safety, which can work normally after short-circuiting under the external folding and cutting.
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JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
·
2023
·Vol. 33
·期 4
·1862-1873
·
IF 2.3
Yan Huanyuan,Liu Wensheng,Ma Yunzhu,Wang Tao,Wu Lei,Yang Lun,Tang Siwei
In this work, Al 2 O 3 ceramic coatings were prepared the surface of powder metallurgy (PM) 2024 aluminum alloy via the micro-arc oxidation (MAO) technique. The effects of the current density and the oxidation treatment time on the microstructure and properties of the MAO coatings were investigated. The results reveal that the oxide film mainly comprises the γ-Al 2 O 3 phase, the amorphous Al 2 O 3 phase, and a small amount of the mullite phase. There are traces of W in the coatings, which exist in the form of W, WO 3 , and W 18 O 49 . With increasing current density, the thickness and surface roughness of the MAO coatings prepared on the PM 2024 alloy increase, while their surface hardness first increases and then decreases. The increase in the current density promotes the transformation of the amorphous Al 2 O 3 phase into the γ-Al 2 O 3 phase. The maximum hardness value of 1270 HV is obtained at a current density of 20 A dm −2 . The MAO coatings provide superior corrosion protection for the PM 2024 aluminum alloy, and the MAO coatings obtained at a current density of 15 A dm −2 exhibit the highest corrosion resistance.
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EJNMMI Research
·
2024
·Vol. 14
·期 1
·1-13
·
IF 3.1
Liu Yang,Xia Li,Li Haiyang,Cai Ping,Tang Sufan,Feng Yue,Liu Guangfu,Chen Yue,Liu Nan,Zhang Wei,Zhou Zhijun
Background Prostate cancer is the second most frequent cancer and the fifth leading cause of cancer-related deaths in men. Prostate-specific membrane antigen (PSMA) as a target has gained increasing attention. This research aims to investigate and understand how altering size of PEG impacts the in vitro and in vivo behavior and performance of PSMA inhibitors, with a specific focus on their pharmacokinetic characteristics and targeting properties. Results Two 68 Ga-labeled PSMA-targeted radiotracers were developed, namely [ 68 Ga]Ga-PP4-WD and [ 68 Ga]Ga-PP8-WD, with varying sizes of polyethylene glycol (PEG). [ 68 Ga]Ga-PP4-WD and [ 68 Ga]Ga-PP8-WD had excellent affinity for PSMA with IC50 being 8.06 ± 0.91, 6.13 ± 0.79 nM, respectively. Both tracers enabled clear visualization of LNCaP tumors in PET images with excellent tumor-to-background contrast. They also revealed highly efficient uptake and internalization into LNCaP cells, increasing over time. The biodistribution studies demonstrated that both radioligands exhibited significant and specific uptake into LNCaP tumors. Furthermore, they were rapidly cleared through the renal pathway, as evidenced by [ 68 Ga]Ga-PP4-WD and [ 68 Ga]Ga-PP8-WD showing a tenfold and a fivefold less in renal uptake, respectively, compared to [ 68 Ga]Ga-Flu-1 in 30 min. Both in vitro and in vivo experiments demonstrated that PEG size significantly impacted tumor-targeting and pharmacokinetic properties. Conclusions These radiotracers have demonstrated their effectiveness in significantly reducing kidney uptake while maintaining the absorbed dose in tumors. Both radiotracers exhibited strong binding and internalization characteristics in vitro, displayed high specificity and affinity for PSMA in vivo .
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Carbon Letters
·
2024
·Vol. 34
·期 2
·603-609
·
IF 5.5
Mai Xuan-Dung,Bui Thi-Thu,Tran Dai-Luat,Mai Van-Tuan,Duong Ngoc-Huyen,Nguyen Van-Hao
Composites of carbon quantum dots (CQDs) are important materials to utilize the optical properties of CQDs in diverse applications including photoluminescence-based sensing and LED phosphors. Combining pre-prepared CQDs with a polymeric matrix usually causes changes in the optical properties of CQDs due to unavoidable aggregation. Recently, the preparation of composites based on in-situ formed CQDs has been debated to overcome the aggregation limits of the conventional mixing methods. Herein, we have demonstrated the synthesis of homogeneous CQDs composites by simple thermal annealing blends of aluminum hydroxide (AlOH), citric acid (CA), and urea (URA). Transmission electron microscopy (TEM), X-ray diffraction, and Raman spectroscopy studies revealed the formation of individual CQDs with a diameter of about 2–9 nm dispersed homogeneously over the AlOH matrix. The composites have a broad excitation band centered at about 360 nm and exhibit excitation-dependent photoluminescence which was similar to that of hydrothermally synthesized CQDs from CA and URA. The photoluminescent intensity of the composite was stable to UV irradiation and responded selectively to Cu(II) ion demonstrating its potential application in Cu(II) sensing.
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危险品化学品经营许可证（带存储）