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Comparison of the Chemical Reactivity between Sulfuric and Methanesulfonic Acids as a Leaching Agent
Thanh Tuan Tran,문현승,이만승 한국자원리싸이클링학회 2021 資源 리싸이클링 Vol.30 No.3
Methanesulfonic acid (MSA) can be considered effective in the leaching of metals because of its advantageous physical and chemical properties. The chemical reactivities of MSA and sulfuric acid were compared based on their structures and the dissolution data of Co and Ni metal. The inductive and resonance effects play a vital role in the chemical reactivities of these two acids. The dissolution percentages of Co and Ni in the sulfuric acid solution were higher than those in the MSA solution under the same experimental conditions. Considering the strong acidity of MSA and the high solubility of its metal salts, MSA can be employed as a leaching agent for the recovery of metals.
Seismic behavior of steel cabinets considering nonlinear connections and site-response effects
Thanh-Tuan Tran,Phu-Cuong Nguyen,Gihwan So,Dookie Kim 국제구조공학회 2020 Steel and Composite Structures, An International J Vol.36 No.1
This paper presents experimental and numerical studies on the seismic responses of the steel cabinet facility considering the nonlinear behavior of connections and site-response effects. Three finite element (FE) models with differences of type and number of connections between steel plates and frame members have been developed to demonstrate adequately dynamic responses of structures. The screw connections with the bilinear force-deformation relationship are proposed to represent the inelastic behavior of the cabinet. The experiment is carried out to provide a verification with improved FE models. It shows that the natural frequencies of the cabinet are sensitive to the plate and frame connectors. The screw connections reduce the free vibration compared to the weld one, with decreased values of 2.82% and 4.87% corresponding to front-to-back and side-to-side directions. Additionally, the seismic responses are investigated for various geological configurations. Input time histories are generated so that their response spectrums are compatible with a required response spectrum via the time-domain spectral matching. The results indicate that both site effects and nonlinear behavior of connections affect greatly on the seismic response of structures.
Solid State Dye-Sensitized Solar Cells Based on Polymeric Ionic Liquid with Free Imidazolium Cation
Thanh-Tuan Bui,Tarik Matrab,Vincent Woehling,Justine Longuet,Cédric Plesse,Giao T.M. Nguyen,Frédéric Vidal,Fabrice Goubard 대한금속·재료학회 2014 ELECTRONIC MATERIALS LETTERS Vol.10 No.1
A polymeric ionic liquid issued from an ionic liquid monomer composed of a methacrylate polymerizable group, a polar tri(ethylene oxide) spacer, a trifluoromethane sulfonic anion and a free imidazolium cation was employed as a solid electrolyte for dye-sensitized solar cells. The simple device configuration based on dip-coated nanoporous TiO2 electrode sensitized by N3 ruthenium-based dye gave the conversion efficiency of up to 1.74% under AM 1.5 simulated solar light illumination. Effect of TiO2 porous film thickness on overall energy conversion efficiency was discussed. It has been found that the most appropriate thickness for the polymeric ionic liquid based electrolyte dye sensitized solar cell is around 7 μm.
Thanh Tuan Nguyen,Hyeong Min Heo,박재영,Seung Hoon Nahm,백운봉 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.4
A series of fracture toughness and fatigue crack growth rate tests were performed on the X70 pipeline steel base and weld metals under 10 MPa of a natural/hydrogen gas mixture with 1 % H 2 blends. It is observed that the 10 MPa gas mixture with 1 % H 2 causes a significant reduction in the fracture toughness in both metals. The fatigue crack growth rates are markedly accelerated under the gas mixtures with 1 % hydrogen blend compared with the tests performed in ambient air. The obtained fracture parameters serve as inputs for fatigue life assessment analyses under the effect of a hydrogen-containing environment. The observed design fatigue life depends strongly only on the environmental conditions. The design fatigue strength of the structural pipeline exposed to hydrogen is much shorter than that under ambient air owing to the decrease in fracture toughness properties and acceleration of the fatigue crack growth rate.
Thanh, Tran Duy,Balamurugan, Jayaraman,Tuan, Nguyen Thanh,Jeong, Hun,Lee, Seung Hee,Kim, Nam Hoon,Lee, Joong Hee Elsevier 2017 Biosensors & bioelectronics Vol.89 No.2
<P><B>Abstract</B></P> <P>A novel hierarchical nanoporous thin film of AuPt alloy embedded in graphene (AuPt@GR) was successfully synthesized through the self-assembly of ultrafine AuPt nanoparticles (~3nm) within GR sheets by means of a facile chemical vapor deposition (CVD) procedure without the use of any external organic capping agent and reducing agent. A binder-free sensor based on the AuPt@GR hybrid material was fabricated and its electrocatalytic activity was evaluated by using it to determine epinephrine (EP) in PBS solution (pH=7.4) and in human serum spiked PBS solution. Amperometric measurements of the sensor response showed an extremely low limit of detection (0.9nM at a signal-to-noise ratio of 3), high sensitivity (1628µAmM<SUP>−1</SUP> cm<SUP>−2</SUP>), wide linear detection range (1.5×10<SUP>−9</SUP>–9.6×10<SUP>−6</SUP> M), and negligible response to interferents. At the same time, the sensor also exhibited very long-term amperometric stability (4000s), cyclic voltammetric stability (500 cycles), good reproducibility, and highly accurate detection of EP in real samples. The excellent electrochemical performance was attributed to synergistic effects of Au, Pt, and GR as well as to the formation of a unique nanoporous structure that provided enhanced electrocatalytic activity, a highly electroactive surface, and fast mass transport. These results suggest strong potential of the AuPt@GR hybrids for use in biosensors and bioelectronic devices.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A novel hierarchical nanoporous AuPt alloy embedded in graphene was successfully synthesized without capping and reducing agents. </LI> <LI> The AuPt@GR based sensor detected epinephrine with low LOD (0.9nM), high sensitivity (1628µAmM<SUP>−1</SUP> cm<SUP>−2</SUP>), and wide linear detection range (1.5×10<SUP>−9</SUP>–9.6×10<SUP>−6</SUP> M). </LI> <LI> The sensor exhibited very long-term amperometric stability (4000s), CV stability (500 cycles), and good reproducibility. </LI> </UL> </P>
Thanh Tuan Tran,손성호,이만승 대한금속·재료학회 2022 대한금속·재료학회지 Vol.60 No.4
The recovery of valuable metals such as cobalt, nickel, and lithium from spent lithium-ion batteries (LIBs) has attracted much attention. In this study, a hydrometallurgical process for the recovery of high-purity lithium compounds like Li2CO3 and Li3PO4 from dust containing Li, Co, Ni, Cu, Fe, Mn, and Si produced during the smelting reduction of spent LIBs was investigated. The separation of Li over other metals from the dust was achieved by two methods. The first method was to leach metals from the dust with distilled water and then to precipitate the dissolved metal ions from the leaching solution at pH 10. The second one was to mix the dust with solid NaOH, following the dissolution of the mixture with distilled water. Optimum conditions for the second method were a 1:0.17 weight ratio of dust to NaOH, 50 g/L pulp density for 120 min at 22o C. These two methods resulted in a solution containing only Li(I) and Na(I). The precipitation of Li(I) to Li2CO3 from the leaching solution by Na2CO3 with the addition of acetone or ethanol was optimized a 1:0.5 molar ratio of Li(I) to Na2CO3, 6:5 volume ratio of solvent to Li(I) solution for 30 min at 22o C. Under the optimum conditions, the precipitation percentage of Li(I) was higher than 92.0% with above 99.0% purity. Additionally, using Na3PO4, 97.1 % Li(I) was precipitated from the leaching solution to Li3PO4 with 93.1% purity. An optimized process for the recovery of lithium compounds from the dust is proposed.