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Ho Chi Minh City, Vietnam

Tran.t T.,Hunan University | Tran.t T.,Industrial University of Ho Chi Minh City | Li J.,Hunan University | Feng H.,Hunan University | And 4 more authors.
Sensors and Actuators, B: Chemical | Year: 2014

A novel photoelectrochemical sensor is fabricated by a convenient surface modification of molecularly imprinted polymer on highly ordered and vertically aligned TiO2 nanotube arrays. As-prepared sensor (denoted as MIP@TiO2 NTAs) is highly sensitive to perfluorooctane sulfonate in water samples, with a linear range from 0.5 to 10 μM and a limit of detection of 86 ng mL-1 (S/N = 3). Moreover, the perfluorooctane sulfonate MIP@TiO2 NTA photoelectrochemical sensor exhibits outstanding selectivity. Twenty times 2,4-dichorophenoxyacetic acid, anthracene-9-carboxylic acid, and pentachlorophenol, or two times perfluoroheptanoic acid and perfluorooctanoic do not interfere the determination of perfluorooctane sulfonate. The practical application of the photoelectrochemical sensor is also realized in the selective determination of perfluorooctane sulfonate in water samples. © 2013 Elsevier B.V. Source

Tran T.,Hunan University | Tran T.,Industrial University of Ho Chi Minh City | Hou S.,Hunan University | Han X.,Hunan University | And 3 more authors.
Thin-Walled Structures | Year: 2014

The triangular tubes with multi-cell were first studied on the aspects of theoretical prediction and crashworthiness optimization design under the impact loading. The tubes? profiles were divided into 2-, 3-, T-shapes, 4-, and 6-panel angle elements. The Simplified Super Folding Element theory was utilized to estimate the energy dissipation of angle elements. Based on the estimation, theoretical expressions of the mean crushing force were developed for three types of tubes under dynamic loading. When taking the inertia effects into account, the dynamic enhancement coefficient was also considered. In the process of multiobjective crashworthiness optimization, Deb and Gupta method was utilized to find out the knee points from the Pareto solutions space. Finally, the theoretical prediction showed an excellent coincidence with the numerical optimal results, and also validated the efficiency of the crashworthiness optimization design method based on surrogate models. © 2014 Published by Elsevier Ltd. All rights reserved. Source

Li Y.-L.,Chung Yuan Christian University | Van Cuong N.,Chung Yuan Christian University | Van Cuong N.,Industrial University of Ho Chi Minh City | Hsieh M.-F.,Chung Yuan Christian University
Polymers | Year: 2014

This study reports on the cellular uptake of folate tethered micelles using a branched skeleton of poly(ethylene glycol) and poly(e-caprolactone). The chemical structures of the copolymers were characterized by proton nuclear magnetic resonance spectroscopy, and Fourier transform infrared spectroscopy. Doxorubicin (DOX) was utilized as an anticancer drug. The highest drug loading efficiencies of DOX in the folate decorated micelle (DMCF) and folate-free micelle (DMC) were found to be 88.5% and 88.2%, respectively, depending on the segment length of the poly(e-caprolactone) in the copolymers. A comparison of fluorescent microscopic images of the endocytosis pathway in two cell lines, human breast cancer cells (MCF-7) and human oral cavity carcinoma cells (KB), revealed that the micelles were engulfed by KB and MCF-7 cells following in vitro incubation for one hour. Flow cytometric analysis revealed that free folic acid can inhibit the uptake of DOX by 48%-57% and 26%-39% in KB cells and MCF-7 cells, respectively. These results prove that KB cells are relatively sensitive to folate-tethered micelles. Upon administering methyl-ß-cyclodextrin, an inhibitor of the caveolae-mediated endocytosis pathway, the uptake of DOX by KB cells was reduced by 69% and that by MCF-7 cells was reduced by 56%. This finding suggests that DMCF enters cells via multiple pathways, thus implying that the folate receptor is not the only target of tumor therapeutics. © 2014 by the authors. Source

Chen L.,Hunan University | Tran. T T.,Hunan University | Tran. T T.,Industrial University of Ho Chi Minh City | Huang C.,Hunan University | And 3 more authors.
Applied Surface Science | Year: 2013

Here it is demonstrated that the Au-Ag-ZnO architecture can be immobilized on indium tin oxide (ITO) substrate through a facile three-step synthesis approach. A series of ZnO films with different modifications of Au and Ag were applied to study the effect of Ag and Au nanoparticles on the morphology, optical properties and photocatalytic activity. An annealing treatment of the ZnO nanosheets before Ag-Au deposition is found to play an important role in the properties of the Au-Ag-deposited ZnO nanosheet (Au-Ag-ZnO). The annealing treatment results in a significant increase in the surface area of ZnO, and consequently an increase in the depositing amount of Ag nanoparticles. The Au-Ag-ZnO film shows nearly twice the photocatalytic efficiency than pure ZnO, and much higher efficiency comparing with the Ag-ZnO film in the photocatalytic degradation of methyl orange (MO) under UV illumination in aqueous solutions. © 2013 Elsevier B.V. All rights reserved. Source

Nagajyothi P.C.,Dongguk University | Minh An T.N.,Dongguk University | Minh An T.N.,Industrial University of Ho Chi Minh City | Sreekanth T.V.M.,Dongguk University | And 3 more authors.
Materials Letters | Year: 2013

In this paper, we report on the synthesis and characterization of zinc oxide nanoparticles (ZnO NPs) by biological method and its utility as catalyst in Claisen Schmidt Condensation reaction has been described. ZnO NPs were characterized by UV-Visible absorption spectroscopy, FTIR, TGA, GC-MS, XRD, SEM-EDX and TEM techniques. The UV-Visible absorption spectrum shows an absorption band at 327 nm due to ZnO NPs. TEM analysis shows ZnO NPs particle size in the range of 8.48-32.51 nm. The eco-friendly, inexpensive and chemically stable catalyst was used for the condensation of 3, 4-dimethyl benzaldehyde and acetophenone. © 2013 Elsevier B.V. Source

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