JOURNAL OF NUCLEAR MATERIALS
·
2014
·
IF 2.016
Xin Wang,Kuo Jiang,Liang Zhou
Powders of (Nd 1− x Ce x ) 2 Zr 2 O 7+ y ( x = 0–1) with pyrochlore structure were prepared by sol-spray pyrolysis and subsequent graphite reduction at 1200 °C. The effects of cerium content on crystal structure, phase stability and microstructure of the (Nd 1− x Ce x ) 2 Zr 2 O 7+ y ( x = 0–1) inert matrix materials were studied. XRD and Raman results presented that all samples were in a single pyrochlore phase. XPS results indicated the cerium was in a single oxidation state of +4. After sintering at 1500 °C for 24 h in air, the sample of x = 1 underwent a phase segregation to Zr 1− x Ce x O 2 solid solutions of tetragonal, metastable tetragonal and cubic phases, the sample of x = 0.9 contained a few tetragonal phase in addition to fluorite phase, the samples of x = 0.5–0.8 had a single phase fluorite structure, the samples of x = 0–0.4 maintained the pyrochlore structure.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2015
·
IF 2.353
Jiaman Liang,Xiaoyan Deng,Kejun Tan
In this paper, a novel sensing method with a higher sensitivity of perfluorooctane sulfonate (PFOS) than perfluorooctanoic acid (PFOA) has been proposed detection of PFOS in aqueous solution replying on the “off–on” switch of eosin Y/polyethyleneimine (PEI)/PFOS fluorescence system due to the higher affinity of PEI to PFOS than eosin Y. In pH 7.0 Britton–Robinson buffer solution, eosin Y reacts with protonated PEI to form complex by electrostatic attraction, which leads to a strong fluorescence quenching of the eosin Y. When PFOS presents, the fluorescence of eosin Y is recover due to the electrostatic and hydrophobic interactions between PFOS and PEI. The recovered fluorescence intensity is proportional to the concentration of PFOS in the ranging from 0 to 2.0 × 10 −6 mol/L with the limit of detection (LOD, 3 σ ) being 1.5 × 10 −8 mol/L without preconcentration. In this study, the optimum reaction conditions and the interferences of foreign substances were investigated. In addition, the effects of PFOA, the analog of PFOS, on the fluorescence recovery of the system were also studied. The presented approach has been successfully used to detect PFOS in real samples with RSD ⩽2.9%.
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DOI
PubMed
高影响因子
RSC Advances
·
2015
·Vol. 6
·期 1
·778-785
·
IF 3.84
Huajun Li,Yining Wu,Xiaoda Wang,Chunying Zhu,Taotao Fu,Youguang Ma
This paper is mainly focused on the investigation of the magnetofluidic control of the breakup of ferrofluid droplets in a symmetric Y-junction. The asymmetric breakup of the ferrofluid droplet or non-breakup with filtering the mother droplet into a desired branch to separate it from the satellite droplet was implemented by an external magnetic field. The breakup processes of ferrofluid droplets with and without the magnetic field were studied systematically. The influences of both the flow rate ratio between the continuous phase and dispersed phase and the magnetic flux density on the sizes of daughter droplets were determined. It was found that the attractive magnetic force shifted the mass center of mother droplet in the upstream main channel, which accordingly facilitated the asymmetric breakup of the droplet at the downstream Y-junction. A power function correlation for precisely predicting the sizes of daughter droplets was proposed by introducing the magnetic Bond number (Bom). Moreover, we also found that the controllable magnetic force could promote the pattern transition between the breakup and non-breakup of ferrofluid droplets.
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高影响因子
POLYMER BULLETIN
·
2018
·Vol. 75
·期 11
·4881-4899
·
IF 1.589
Zhang Mengmeng,Chang Liangliang,Zhao Yuanyuan,Yu Zehao
Montmorillonite/polypyrrole (MMT/PPy) nanocomposites were fabricated by in situ polymerization of pyrrole monomer in the presence of MMT. The structures of the nanocomposites were analyzed by X-ray diffraction, Fourier transform infrared spectra, thermogravimetric analysis and transmission electron spectroscopy. Then, the capability of MMT/PPy nanocomposites on the removal of Eosin Y from aqueous solution was systematically studied. The MMT/PPy nanocomposites showed high adsorption capacity toward Eosin Y and a maximum adsorption capacity of 112.9 mg/g at 35 °C was achieved. The adsorption kinetics demonstrated a rapid Eosin Y uptake by MMT/PPy and the experimental data were well fitted to the pseudo-second-order model. Both the Langmuir and Freundlich models were employed to describe the adsorption isotherms, and the results presented that the equilibrium data obeyed the Langmuir model. Thermodynamic parameters of Δ G ° and Δ H ° verified the spontaneous and endothermic nature of the Eosin Y adsorption onto MMT/PPy. Furthermore, the regeneration experiments revealed that MMT/PPy nanocomposites could be reused after treated with hydrochloric acid solution, showing potential applications in purification of dyeing effluents.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Huaizhi He,Irshad Ahmad Mir,Baoji Miao,Shuaiqian Wang,Yao Zhao,Mingzhe Wang,Jinbo Bai
MXenes are remarkable 2D materials for microwave absorption applications, with respect to physical and chemical properties. However, their elevated electrical conductivity and impedance mismatch results in a diminished microwave absorption rate. To overcome these issues, we have prepared TiVCrC 2 T x and Ti 0.5 V 2 Cr 0.5 C 2 T x MXenes using an element doping strategy. Thanks to their suitable dielectric constant, lattice distortion, and a large amount of defects caused by multiple transition metal atoms, results in an increase in polarization loss, enhanced impedance matching, and increased electromagnetic (EM) wave absorption capability. The experimental results showed that few-layer TiVCrC 2 T x with a thickness of 3.19 mm and operating frequency as 6.88 GHz can achieve a minimum reflection loss (RL min ) of −57.8 dB. Additionally, it has an effective absorption bandwidth (EAB) of 2.88 GHz. On the other hand, few-layer Ti 0.5 V 2 Cr 0.5 C 2 T x with a thickness of 1.95 mm and operating at a frequency of 10.72 GHz has an RL min of −52.75 dB and an EAB of 1.44 GHz. The advantages of the element doping strategy in enhancing the microwave absorption performance of MXene are demonstrated by its excellent EM wave absorption capability, thin matching thickness, and low filling amounts of only 30 wt percent. These results suggest that doped MXene showed highly promising application in the field of EM wave absorption.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Jie Li,Jie Sheng,Changsheng Xing,Bin Liu,Yunzhong Wu,Tong Zhang,Jiaxu Shuang,Ziyue Yang,Lidong Wang,Weidong Fei
The strategic design and assembly of bulk graphene materials represent a pivotal advancement for harnessing the inherent properties of graphene in practical applications. However, fabricating high-strength graphene-based bulk materials from graphene powders presents a significant challenge, primarily due to interlayer slippage between the graphene layers. Here, a unique Y-type connection structure was found in few-layer graphene synthesized by self-propagating high-temperature synthesis (SHS) and subsequently retained in graphene-based bulk materials prepared by spark plasma sintering (SPS) process. The Y-type connection structure and defect-induced linkages serve to cross-link the graphene-based bulk materials. Consequently, the bulk material exhibited an ultra-high compressive strength, reaching 2.14 GPa, supported by Molecular dynamics (MD) simulations which demonstrated that the Y-type connection structure increases the shear modulus and the load transfer rate. The Y-type connection structure plays a vital role in reinforcing the strength of graphene-based bulk materials, offering valuable insights for the microstructural design and property augmentation of other graphene-derived materials. Besides it’s ultra-high compressive strength, the graphene-based bulk material also performs a low thermal expansion coefficient (0.5 × 10 −6 K −1 ), high electrical conductivity (1.47 × 10 5 S·m −1 ) and exceptional EMI shielding capability.
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CHEMICAL ENGINEERING SCIENCE
·
2025
·
IF 4.3
Zehui Shang,Yinan Liu,Chunying Zhu,Taotao Fu,Xiqun Gao,Youguang Ma
The breakup of water-in-water droplets in a Y-junction microchannel was experimentally investigated, focusing on the unobstructed breakup mode due to its broad applicability. This process was divided into four stages: entering, squeezing, pinch-off, and filament rupture, based on the evolution of the neck width and its thinning rate. In the entering stage, neck thinning accelerates with increasing dispersed-phase flow rate Q d , droplet length l 0 , and two-phase viscosity ratio λ , and slows down with increasing continuous phase flow rate Q c . In the squeezing stage, the minimum neck width follows a power-law relation with time. The thinning rate increases with higher Q d , l 0 , and λ , whereas increasing Q c inhibits thinning. In the pinch-off stage, neck width decreases linearly with time, and the thinning is enhanced by higher Q c , Q d , and l 0 , but remains nearly independent of λ . The filament rupture stage follows a power-law thinning trend, and exhibits similar parameter dependencies, though satellite droplets may form at high Q d and Q c , and show increased instability at low viscosity. These findings offer insights into neck dynamics and interfacial rupture in low interfacial tension systems.
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2024
·
IF 5.7
Zilin Wu,Chun Zhang,Yuanqin Huang,Na Tao,Tao Wang,Xiaobo Cai,Zhenchao Wang,Xiangyang Li
Potato virus Y (PVY) is a plant virus that is known to be responsible for substantial economic losses in agriculture. Within the PVY genome, viral genome-linked protein (VPg) plays a pivotal role in the viral translation process. In this study, VPg was used as a potential target for analyzing the antiviral activity of tryptanthrin derivatives. In vitro, the dissociation constants of B1 with PVY VPg were 0.69 μmol/L (measured by microscale thermophoresis) and 4.01 μmol/L (measured via isothermal titration calorimetry). B1 also strongly bound to VPg proteins from three other Potyviruses. Moreover, in vivo experiments demonstrated that B1 effectively suppressed the expression of the PVY gene. Molecular docking experiments revealed that B1 formed a hydrogen bond with N121 and that no specific binding occurred between B1 and the PVY VPgN121A mutant. Therefore, N121 is a key amino acid residue in PVY VPg involved in B1 binding. These results highlight the potential of PVY VPg as a potential target for the development of antiviral agents.
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PubMed
高影响因子
ACS Nano
·
2024
·
IF 15.8
Lu Yu,Xiao-Lei Shi,Yuanqing Mao,Wei-Di Liu,Zhen Ji,Sitong Wei,Zipei Zhang,Weiyu Song,Shuqi Zheng,Zhi-Gang Chen
Incorporating donor doping into Mg3Sb1.5Bi0.5 to achieve n-type conductivity is one of the crucial strategies for performance enhancement. In pursuit of higher thermoelectric performance, we herein report co-doping with Te and Y to optimize the thermoelectric properties of Mg3Sb1.5Bi0.5, achieving a peak ZT exceeding 1.7 at 703 K in Y0.01Mg3.19Sb1.5Bi0.47Te0.03. Guided by first-principles calculations for compositional design, we find that Te-doping shifts the Fermi level into the conduction band, resulting in n-type semiconductor behavior, while Y-doping further shifts the Fermi level into the conduction band and reduces the bandgap, leading to enhanced thermoelectric performance with a power factor as high as >20 μW cm–1 K–2. Additionally, through detailed micro/nanostructure characterizations, we discover that Te and Y co-doping induces dense crystal and lattice defects, including local lattice distortions and strains caused by point defects, and densely distributed grain boundaries between nanocrystalline domains. These defects efficiently scatter phonons of various wavelengths, resulting in a low thermal conductivity of 0.83 W m–1 K–1 and ultimately achieving a high ZT. Furthermore, the dense lattice defects induced by co-doping can further strengthen the mechanical performance, which is crucial for its service in devices. This work provides guidance for the composition and structure design of thermoelectric materials.
研究领域:
材料科学
·
物理学
·
纳米技术
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Reaction Kinetics Mechanisms and Catalysis
·
2014
·Vol. 113
·期 2
·605-614
·
IF 0.983
Liu Hong,Yang Guohai
Gas-phase transformation of toluene is carried out on Cs-exchanged NaY zeolite in a fixed-bed tubular reactor and it is observed that toluene can transform through dealkylation, producing benzene and a small amount of hydrogen under the experimental conditions. After a definite activation period, the transformation of toluene can achieve its steady state with the yield of benzene above 25 % for a relatively long continuous time at low space velocity. Combining the results of characterization and catalytic performances, it can be concluded that benzene is the steadiest product except the carbonaceous residues within the CsY zeolite pores. The in situ carbonaceous deposition experiment shows a similar trend of the carbonaceous forming process and the yield of benzene, indicating the important role of carbonaceous species in the formation of benzene, i.e., it is necessary for the accumulation of carbonaceous species in the initial stage of reaction. The discovery in the current work sheds light on new strategies for the transformation of other similar compounds.
研究领域:
催化化学
·
材料化学
·
物理化学
·
能源化学
·
工业催化
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高影响因子
Frontiers of Environmental Science & Engineering
·
2020
·Vol. 14
·期 6
·1-12
·
IF 4.053
Zhang Yingdan,Liu Na,Wang Wei,Sun Jianteng,Zhu Lizhong
Titanium dioxide nanoparticle (nano-TiO 2 ), as an excellent UV absorbent and photo-catalyst, has been widely applied in modern industry, thus inevitably discharged into environment. We proposed that nano-TiO 2 in soil can promote crop yield through photosynthetic and metabolic disturbance, therefore, we investigated the effects of nano-TiO 2 exposure on related physiologic-biochemical properties of rice ( Oryza sativa L.). Results showed that rice biomass was increased >30% at every applied dosage (0.1–100 mg/L) of nano-TiO 2 . The actual photosynthetic rate (Y(II)) significantly increased by 10.0% and 17.2% in the treatments of 10 and 100 mg/L respectively, indicating an increased energy production from photosynthesis. Besides, non-photochemical quenching (Y(NPQ)) significantly decreased by 19.8%–26.0% of the control in all treatments respectively, representing a decline in heat dissipation. Detailed metabolism fingerprinting further revealed that a fortified transformation of monosaccharides (D-fructose, D-galactose, and D-talose) to disaccharides (D-cellobiose, and D-lactose) was accompanied with a weakened citric acid cycle, confirming the decrease of energy consumption in metabolism. All these results elucidated that nano-TiO 2 promoted rice growth through the upregulation of energy storage in photosynthesis and the downregulation of energy consumption in metabolism. This study provides a mechanistic understanding of the stress-response hormesis of rice after exposure to nano-TiO 2 , and provides worthy information on the potential application and risk of nanomaterials in agricultural production.
研究领域:
农业科学
·
植物生理学
·
环境科学
·
纳米技术
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高影响因子
JOURNAL OF CATALYSIS
·
2018
·
IF 6.759
Meng Pan,Jiajun Zheng,Yujian Liu,Weiwei Ning,Huiping Tian,Ruifeng Li
The conversion of the heavy fractions of crude oil into transportation fuels and chemical feedstocks is still a severe challenge for fluid catalytic cracking (FCC) technology, in which geometrical parameters of the catalyst are of key importance to the accessibility for reactant and product molecules to travel through the pore space. Here a new core-shell zeolite catalyst with hierarchical pore network from macro- via meso- to micropores is developed by controlling overgrowth of another zeolite shell on the surface of a commercial Y-zeolite. The zeolite shell is a distinctive nano ZSM-5 crystals. The core-shell zeolite catalyst has a high thermal and hydrothermal stability because of high crystallinity, which can meet the industrial requirements. More importantly, the heavy oil can be cracked by the designed zeolite catalyst step-by-step into the required products. The meso- and macroporous shell facilitates pre-cracking the large molecules in heavy oil into moderate ones which can directly diffuse into the micropores of the Y-zeolite to be cracked selectively into the desired products. Both the pore structure network and acid sites distribution of the core-shell zeolite catalyst in the FCC processing are completely harmonious. As a practical example, the catalytic cracking of VGO heavy oil is actualized over the new catalyst. The results showed that the conversion of heavy oil and the yield of gasoline increased by 1.8 wt% and 8.9 wt% respectively, LPG decreased by 6.9 wt%, iso -paraffins and olefins in gasoline fraction increased by 5.21 wt% and 6.31 wt% respectively, aromatics decreased by 11.55 wt%, because of the graduated cracking in core-shell zeolite and returned isomerization in nano ZSM-5, compared with commercially industrial FCC catalyst.
研究领域:
化学工程
·
催化材料
·
石油加工
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