Barium titanate(BaTiO_(3))is an important ferroelectric and electronic ceramic material because of its outstanding dielectric and ferroelectric *** demand for BaTiO_(3) nanoparticles with adjustable particle size has ...
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Barium titanate(BaTiO_(3))is an important ferroelectric and electronic ceramic material because of its outstanding dielectric and ferroelectric *** demand for BaTiO_(3) nanoparticles with adjustable particle size has increased extensively due to the miniaturization of electronic *** oxalate precipitation method is regarded as a highly attractive technology for fabricating BaTiO_(3) nanoparticles,as it enables large-scale production at a low ***,the calcination process is a crucial step that significantly influences the particle size and morphology of the obtained BaTiO_(3) *** study investigates the thermal decomposition mechanism and particle size regulation strategies during the calcination of barium titanyl oxalate tetrahydrate(BTOT)for fabricating BaTiO_(3) *** Kissinger-Akahira-Sunose(KAS)model is used to calculate the kinetic parameters of BTOT thermal decomposition process,and the results indicate that the decomposition process can be divided as four stages,with the average activation energy of 60.77,269.89,484.72,and 199.82 kJ/mol,*** average activation energy reaches its maximum value in the third stage,indicating that the thermal decomposition reaction in this stage is more challenging to occur compared to the other *** gas release behaviors of H_(2)O,CO,and CO_(2) are analyzed on-line during the thermal decomposition of BTOT,and the overall reaction mechanism is ***,by adjusting the calcination parameters,the particle size of BaTiO_(3) could be effectively regulated within the range of 25-120 *** the heating rate from 10 to 40 K/min decreases the average particle size of BaTiO_(3) from 62 to 44 *** the calcination time from 0 to 120 min increases the average particle size from 25 to 71 *** the terminal temperature from 1173 to 1273 K significantly increases the average particle size from 56 to 120 ***,accelerating the heating rat
Essentially clearing the structure-activity relationship between iron carbide catalysts involving multiple active centers to understand the reaction mechanism of CO hydrogenation conversion process is still a great **...
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Essentially clearing the structure-activity relationship between iron carbide catalysts involving multiple active centers to understand the reaction mechanism of CO hydrogenation conversion process is still a great ***,two main micro-environment factors,namely electronic properties and geometrical effects were found to have an integrated effect on the mechanism of CO hydrogenation conversion,involving active sites on multiple crystal *** Bader charge of the surface Fe atoms on the active sites had a guiding effect on the CO activation pathway,while the spatial configuration of the active sites greatly affected the energy barriers of CO *** the defective surfaces were more conducive to CO activation,the defective sites were not the only sites to dissociate CO,as CO always tended to dissociate in a wider *** synergistic effect of the micro-environment also occurred during the CO conversion *** C atoms on relatively flat configurations were more likely to form methane,while the electronic properties of the active sites could effectively describe the C-C coupling process,as well as distinguish the coupling mechanisms.
As economic globalization accelerates, biofuel supply chain systems are becoming increasingly complex and large-scale, with businesses facing rising uncertainties and an increased risk of disruptions. Designing resili...
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The demand for high safety and high reliability lithium-ion batteries(LIBs)is strongly considered for practical ***,due to their inherent self-discharge properties or abuse,LIBs face the threat of over-discharge,which...
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The demand for high safety and high reliability lithium-ion batteries(LIBs)is strongly considered for practical ***,due to their inherent self-discharge properties or abuse,LIBs face the threat of over-discharge,which induces premature end of life and increased risk of thermal *** addition,a strong demand for batteries with zero-volt storage is strongly considered for aerospace and implantable medical *** this review,we firstly introduce the necessity and the importance of over-discharge and zero-volt protection for *** mechanism of damage to the Cu current collectors and SEI induced by potential changes during over-discharge is *** current over-discharge protection strategies based on whether the zero-crossing potential of the electrodes is ***,the fresh insights into the material design of cathode prelithiation additives are presented from the perspective of over-discharge protection.
The pollution especially organic dyes pollution of water resources is an urgent issue to be *** is crucial to develop highly efficient,low cost and recyclable heterogeneous catalysts for wastewater *** this study,a he...
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The pollution especially organic dyes pollution of water resources is an urgent issue to be *** is crucial to develop highly efficient,low cost and recyclable heterogeneous catalysts for wastewater *** this study,a heterogeneous Fenton catalyst loaded with Fe_(3)O_(4)nanoparticles was prepared by one step pyrolysis using natural crop waste corncob as carbon *** prepared porous carbon catalyst can effectively degrade methyl orange(MO,25 mg·L^(-1))at room temperature,and the degradation rate is 99.7%.In addition to high catalytic degradation activity,the layered porous carbon structure of the catalyst also provides high stability and *** degradation rate can be maintained above 93%after 10 ***,the prepared catalyst is magnetic,which makes the catalyst easy to recycle in practical *** addition,the prepared Fe3O4/RCC catalyst has efficient Fenton degradation activity for bisphenol A(BPA)(96.9%)and antibiotic tetracycline hydrochloride(TC-HCl)(95.5%),which proves that it has universal applicability for the degradation of most organic *** study provides a feasible and scalable strategy to prepare a heterogeneous Fenton catalyst treating wastewater and high-value utilization of biomass waste.
Preparing multifunctional coatings with both anti-corrosion and anti-biofouling properties is *** has been in the spotlight as an effective biocide,especially in the recent past concerning its impact on causing enviro...
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Preparing multifunctional coatings with both anti-corrosion and anti-biofouling properties is *** has been in the spotlight as an effective biocide,especially in the recent past concerning its impact on causing environmental *** the amount used and increasing its efficiency have become the focus of *** hybridization of titanium dioxide nanoparticles(NPs)with copper metal-organic frameworks(MOFs)can significantly improve antimicrobial performance due to its photocatalytic ***(TiO_(2)-Cu-BTC)of titanium dioxide nanoparticles and copper 1,3,5-benzenetricarboxylate acid(Cu-BTC),obtained by three up-sampling methods,namely hydrothermal,mechanical stirring,and in-situ growth,were doped into epoxy resin(TiO_(2)-Cu-BTC/EP)to enhance its anticorrosion and antifouling *** loaded forms were determined by field emission scanning electron microscopy and confirmed using Fourier infrared spectroscopy and X-ray diffraction *** lethality of the composite coating against Escherichia coli(***)increased by 12%after 3 h of exposure to light,and the impedance value increased by 1×1010Ω.The efficiency of the coating was greatly improved.
The wider commercialization of Proton Exchange Membrane Fuel Cells(PEMFCs)has been significantly hampered by the expensive noble metal catalysts[1],slow oxygen reduction reaction(ORR)and low electrochemical stability ...
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The wider commercialization of Proton Exchange Membrane Fuel Cells(PEMFCs)has been significantly hampered by the expensive noble metal catalysts[1],slow oxygen reduction reaction(ORR)and low electrochemical stability of the electrocatalyst[2].The development of noble metal-free electrocatalysts can significantly reduce the manufacturing cost of *** nitrogen-coordinated FeN4 sites are considered to be active for ORR[3,4],their catalytic performance and durability need to be significantly ***,Wu et al.
Direct air capture (DAC) using amine-functionalized solid adsorbents holds promise for achieving negative carbon emissions. In this study, a series of additive-incorporated tetraethylenepentamine-functionalized SiO_(2...
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Direct air capture (DAC) using amine-functionalized solid adsorbents holds promise for achieving negative carbon emissions. In this study, a series of additive-incorporated tetraethylenepentamine-functionalized SiO_(2) adsorbents with varying tetraethylenepentamine and additive contents were prepared via a simple impregnation method, characterized by various techniques, and applied in the DAC process. The structure-performance relationship of these adsorbents in DAC was investigated, revealing that the quantity of active amine sites (or the tetraethylenepentamine content in the exposed layer), as determined by CO_(2)-TPD measurement, was an important factor affecting the adsorbent performance. This factor, which varied with the tetraethylenepentamine content, additive type, and additive content, showed a positive correlation with the CO_(2) adsorption capacity of the adsorbents. The optimal adsorbent, 40TEPA-10PEG/SiO_(2) containing 40 wt % tetraethylenepentamine and 10 wt % polyethylene glycol (Mn = 200), exhibited a stable CO_(2) capacity of 2.1 mmol·g^(-1) and amine efficiency of 0.22 over 20 adsorption–desorption cycles (adsorption at 400 ppm CO_(2)/N2 and 30℃ for 60 min, and desorption at pure N2 and 90℃ for 20 min). Moreover, even after deliberate accelerated oxidation treatment (pretreated in air at 100℃ for 10 h), the CO_(2) capacity of 40TEPA-10PEG/SiO_(2) remained at 2.0 mmol·g^(-1). The superior thermal and oxidative stability of 40TEPA-10PEG/SiO_(2) makes it a promising adsorbent for DAC applications.
Drug delivery via pulmonary inhalation can achieve targeted treatment by directly delivering the drugs to the area for treatment. The method is developing rapidly for the treatment of local and systemic diseases. Howe...
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Flange connections are widely used in industries such as petrochemicals and nuclear power, where they encounter complex mechanical and thermal loads, making them potential sources of leakage. Leakage not only affects ...
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