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Nguyen Van Hung,Bui Thi Minh Nguyet,Nguyen Huu Nghi,Nguyen Minh Luon,Nguyen Ngoc Bich,Le Van Thanh Son,Nguyen Trung Kien,Dao Ngoc Nhiem,Nguyen Thanh Tuoi,Dinh Quang Khieu 대한환경공학회 2024 Environmental Engineering Research Vol.29 No.4
In the present work, ZnO/g-C₃N₄/biochar was prepared, and it was used for visible-light driven photocatalytic degradation of some colorants (methylene blue, rhodamine B, methyl orange) and some antibiotics (doxycycline, ciprofloxacin, amoxicilline). Biochar was prepared by pyrolysing Phragmites australis biomass. The ZnO/g-C₃N₄/biochar composite was synthesized with the alkaline hydrolysis method. The obtained materials were characterized by X-ray diffraction, scanning electron microscopy, transition electron microscopy, energy dispersive X-ray/elemental mapping, ultraviolet-visible-diffuse reflectance spectroscopy, photoluminescence spectroscopy, nitrogen adsorption/desorption isotherms and X-ray photoelectron spectroscopy. The results show that ZnO nanoparticles with a large surface area are highly dispersed on the g-C₃N₄ particle surface and biochar. The composite exhibits superior photocatalytic degradation ability toward doxycycline, a broad-spectrum antibiotic of the tetracycline compared with individual components (ZnO or g-C₃N₄) and satisfies stability after six treatment cycles. The kinetics and degradation mechanisms of doxycyline were also addressed. In addition, the present catalyst also exhibits the photocatalytic degradation of methylene blue, rhodamine B, methyl orange, ciprofloxacin and amoxicillin in visible-light regions.
Highly efficient adsorption of arsenite from aqueous by zirconia modified activated carbon
Pham Ngoc Chuc,Nguyen Quang Bac,Dao Thi Phuong Thao,Nguyen Trung Kien,Nguyen Thi Ha Chi,Nguyen Van Noi,Vo Thang Nguyen,Nguyen Thi Hong Bich,Dao Ngoc Nhiem,Dinh Quang Khieu 대한환경공학회 2024 Environmental Engineering Research Vol.29 No.2
Nguyen Van Hieu,Le Thi Ngoc Loan,Nguyen Duc Khoang,Nguyen Tuan Minh,Do Thanh Viet,Do Cong Minh,Tran Trung,Nguyen Duc Chien 한국물리학회 2010 Current Applied Physics Vol.10 No.2
In this paper, a very simple procedure was presented for the reproducible synthesis of large-area SnO2nanowires (NWs) on a silicon substrate by evaporating Sn powders at temperatures of 700, 750, and 800 ℃. As-obtained SnO2 NWs were characterized by field emission scanning electron microscopy (FESEM),transmission electron microscopy (TEM), X-ray diffraction (XRD), and Raman spectroscopy. They revealed that the morphology of the NWs is affected by growth temperature and the SnO2 NWs are single-crystalline tetragonal. The band gap of the NWs is in the range of 4.2–4.3 eV as determined from UV/visible absorption. The NWs show stable photoluminescence with an emission peak centered at around 620 nm at room-temperature. The sensors fabricated from the SnO2 NWs synthesized at 700 ℃ exhibited good response to LPG (liquefied petroleum gas) at an operating temperature of 400 ℃.
Actuation Displacement of Unimorph Piezoelectric Actuators with External Loading
Ngoc-Trung Nguyen,윤광준,박훈철 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.I
In real applications, unimorph piezoelectric actuators always work under a certain carrying load. The center loading configuration can be found in the recent application of LIPCA (Lightweight Piezoceramic Composite Actuator) as the artificial muscle for flapping device. LIPCA is also used with tip loading configuration in our new model of MAV elevator. The loading performance of the device should be fully understood. This paper presents a study on the actuation displacement of unimorph piezoelectric actuators with two loading conditions: center loading and tip loading. The actuation displacement of loaded unimorph piezoelectric actuators is predicted by the finite element method and observed by experiments. Surprisingly, the predictions do not show the correct tendency of behavior of the device. Two typical kinds of piezoelectric unimorph actuator, LIPCA-C3 and THUNDER, are investigated numerically and experimentally. Some remarks on the observations are presented.
Design of High Strength Differential TWB to Enhance Drawability: FE Study and Optimization
Nguyen, Ngoc-Trung,Hariharan, Krishnaswamy,Barlat, Frederic,Lee, Myoung-Gyu Korean Society for Precision Engineering 2014 International Journal of Precision Engineering and Vol.15 No.11
In this study, cylindrical cup deep drawing of the high strength differential Tailor Welded Blank (TWB) consisting of Twinning-Induced Plasticity (TWIP) steel and low carbon steel (mild steel) was investigated using a finite element (FE) analysis. The strength ratio of TWIP to mild steel was about 4, which has not been investigated in previous researches. The formability of the TWB sheet was correlated to the weld-line movement and the thinning in the softer part of the TWB. From this virtual FE experiment, the inferior drawability of TWB when compared to monolithic blanks resulted from uncontrolled material flow. A modified tool design was proposed by adding the counter-punch concept to control the material flow near the weld-line. Then, the process parameters such as blank holding force, counter-punch force, friction conditions of punch-to-blank and counter-punch-to-blank were optimized using the Taguchi method. An improved tool design in combination with optimized process parameters improved the drawability of the TWB significantly.
Preparation and characterization of silicone resin nanocomposite containing CdSe/ZnS quantum dots
Trung, Nguyen Ngoc,Luu, Quynh‐,Phuong,Son, Bui Thanh,Sinh, Le Hoang,Bae, Jin‐,Young Wiley Subscription Services, Inc., A Wiley Company 2012 Polymer composites Vol.33 No.10
<P><B>Abstract</B></P><P>We report the preparation of the core/shell cadmium selenide/Zinc sulfide quantum dots (CdSe/ZnS QDs)‐silicone resin nanocomposite through the solution‐mixing method, followed by thermal hydrosilylation. After dispersing QDs into Dow Corning two‐component silicone resins (OE6630A and OE6630B at 1:4 mixing ratio by weight), the resins were cured at 150°C for 1.5 h to produce QD‐silicone resin nanocomposites. The curing behavior of the silicone resins resulting from the thermal hydrosilylation was studied using differential scanning calorimetry (DSC). The properties of the QD‐silicone resin nanocomposites were investigated by ultraviolet–visible (UV–vis), fluorescence, confocal laser scanning microscopy (CLSM), atomic force microscopy (AFM), and thermogravimetric analysis (TGA) measurements. The QDs that contain trioctylamine (TOA) as the original ligand can poison the Pt catalyst in the resins and inhibit the curing process by increasing the exothermic peak temperature, at which a lower heat of hydrosilylation is observed. Incorporating a small amount of CdSe/ZnS QDs (0.1 wt%) can greatly improve the thermal stability of the silicone resins. Moreover, CdSe/ZnS QDs tend to form clusters that are relatively homogeneously distributed in a cured silicone resin, offering good optical properties of 11.2 lm W<SUP>−1</SUP> luminous efficiency and 14.6% photoluminescence conversion efficiency (PCE) in light emitting device (LED) test. POLYM. COMPOS., 2012. © 2012 Society of Plastics Engineers</P>
Nguyen Thu Hang,Nguyen Mai Chi,Nguyen Hoang Trung,Thi Y Van Tran,Vu Ngoc Trung,Thu Hang Bui,Duc Trinh Chu,Bui Tung Thanh,Jen Chun-Ping,Quang Loc Do 한국농업기계학회 2024 바이오시스템공학 Vol.49 No.1
Purpose Circulating tumor cell separation and analysis have played a critical role in cancer diagnosis, prognosis, and treatment. In this work, we aim to design and investigate a novel biochip that integrates dielectrophoresis, microfl uidic technology to separate circulating tumor cells from blood cells. To create a dielectrophoresis-induced non-uniform electric fi eld, a facing-electrode design was proposed and utilized, in which a slanted electrode array and a simple rectangular ground electrode are placed parallel on the top and bottom parts of the microfl uidic channel, respectively. This design can reduce the particle position dependence in the microchannel and the complexity of the microfabrication process. Methods The separation process, effi ciency, and optimization of the proposed device were numerically investigated using the fi nite element method. Parametric research was conducted to comprehensively examine the impact of various operating and design factors on the cell movement and trajectories in the microfl uidic device. Results The results indicated the potential of the proposed biochip to ensure cancer cell separation from blood cells with high effi ciency, high purity in a label-free, non-invasive, easy integration, and low-cost manner. Under the optimal conditions, the separation effi ciency reached 92%, 88%, and 96% for human colon cancer cells (HT-29), red blood cells, and white blood cells, respectively. Conclusions In this study, a novel DEP-based microfl uidic chip was proposed to separate HT-29 tumor cells from blood cells and numerically investigated to verify the performance of the biochip design. Our fi ndings could provide a foundation for further theoretical and practical investigations. The proposed system can separate cancer cells from red blood cells and white blood cells as well as off ers numerous advantages, such as compact size, low voltage, high effi ciency, non-invasiveness, and label-free nature. The tumor cell enrichment platform has the potential for application in cancer detection, analysis, and assessment.
Strength Evaluation of AA6061-T6 Friction Stir Spot Welding
Ngoc-Trung Nguyen,Dae-Young Kim,Heon Young Kim 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
The present research aims to predict failure in friction stir spot welding (FSSW) joint of aluminum alloy 6061-T6 plates under specific loading cases using finite element method. The characteristics and dimensions of different regions of a FSSW joint including the stir zone (SZ), heat-affected zone (HAZ), thermal-mechanical affected zone (TMAZ), and base metal were obtained from literature. Then, the mechanical properties calculated from a relation between the measured hardness values and the corresponding strengths for each zone were applied to the failure prediction model. In which, the ESI-Wilkins-Kamoulakos (EWK) rupture model of the PAM-CRASH commercial software was employed to verify a simple case of the lap-shear tension test. The failure load obtained in this model showed a good agreement with the experimental value in reference. Then, the failure prediction for the other loading cases (peel-tension test specimen and cross-tension test specimen) was conducted following the same analysis procedure for the lap-shear tension test specimen.