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( Nguyen Quoc Khuong Anh ),( Maiduyhien ),유효종 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Rational design of molecular platforms with structural hiearachy and complexity based on the coordination-driven multilevel assembly of each fundamental units is of considerable interest. Notably, discrete molecular cages could be developed from well-organized secondary supramolecules through tertiary assembly process. In this work, a variety of tertiary discrete molecular cages with distinct functionalities resulting from the hierarchical arrangement of triple-stranded supramolecular helicates is reported. The discrete molecular cages show significantly enhanced CO<sub>2</sub> adsoprtion properties in comparison with separate triple-stranded helicates.
Synthesis and Electrocatalytic Application of Palladium Alloys Deposited on Tin Doped Indium Oxide
( Nguyen Quoc Khuong Anh ),( Maiduyhien ),유효종 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Tin doped indium oxide (ITO) nanoparticles are known as promising noncarbon supports for the oxygen reduction reaction (ORR) in proton exchange membrane fuel cells (PEMFC). This is mainly because of the high electrical conductivity of indium oxide and beneficial electronic interactions between deposited platinum nanoparticles and tin oxide. In addition, there have also been considerable interest in employing palladium (Pd) alloys as a substitute for Pt catalyst because their performance is quite competitive with expensive Pt catalyst. However, in previous studies, either the catalyst was changed or the support was replaced. In this work, we report a synthetic procedure for depositing Pd alloys on ITO support and its electrocatalytical properties. Interestingly, in comparison to the traditional catalyst for PEMFC, both the catalyst and the support were replaced and investigated simultaneously.
Integration of Magnetism and Fluorescence within Iron Oxide-Silica Core-Shell Nanohybrids
( Nguyen Quoc Khuong Anh ),( Maiduyhien ),유효종 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Iron oxide-silica core-shell (Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub>) nanohybrids are successfully prepared via both Stöber and reverse microemulsion (water-in-oil) approach using sodium oleate as a stabilizing agent. In addition, the formation of highly fluorescent, multiple Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub> (FL multi-Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub>) by functionalizing organic (fluorescein) and inorganic (Rubpy) dyes through the sequential hydrolysis and condensation process of tetraethylorthosilicate (TEOS) and 3-(aminopropyl) triethoxysilane (APTES) is also reported. These synthetic procedure can be relevant to the fabrication of differently intriguing nanomaterials with a wide range of application.
Nguyen Duy Dat,Ton That Loc,Mai Thuan Trieu,Dong Thanh Nguyen,Khuong Quoc Nguyen,My Linh Nguyen,Anh Duy Duong Le,Hai Nguyen Tran 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.4
Two new composites from synthetic clay-like materials and carbon spheres were developed. Layered doubledhydroxides (LDH) were synthesized from the coprecipitation of Mg2+ and Al3+ ions. Spherical hydrochar (SH) wasprepared from pure glucose through hydrothermal carbonization at 190 oC. The composite LDH–SH was synthesizedthrough a simple hydrothermal method of the mixture of LDH and SH. Another composite, LDO-SB, was directly preparedthrough the carbonization of LDH-SH at 500 oC. Under such high temperature, LDH was converted to layereddoubled oxides (LDO), and SH was transferred to spherical biochar (SB). Those materials were characterized by chemicalstability, surface morphology and element composition, crystal structure, surface functional group, and texturalcharacteristic. They were applied for removing cationic dye (methylene blue; MB) and anionic dye (Congo red; CR)under different pH solutions. Three adsorption components—kinetics, isotherm, and thermodynamics—were conductedunder batch experimenters. Results demonstrated that the LDH or LDO particles were assembled on the surfaceof SH or SB, respectively. The surface area, total pore volume, and average pore width of LDH–SH and LDO-SBwere 58.5 and 198m2/g, 0.319 and 0.440 cm3/g, and 21.8 and 8.89 nm, respectively. The maximum adsorption capacityof the materials, calculated from the Langmuir model, at 30 oC for CR and MB dyes was 1589 and 78.6mg/g (LDOSB)and 499 and 226mg/g (LDH-SH), respectively. The composites exhibited a higher affinity to anionic than cationicdyes, which resulted from the great contribution of the clay-like materials. Therefore, they can serve as a promisingcomposite for the decolorization of wastewater.
Nguyen Ngoc Duy Phuong,Mai Ngoc Khuong,Thai Hoang Quoc,Le Nguyen Thanh Dong 한국유통과학회 2017 KODISA ICBE (International Conference on Business Vol.2017 No.-
The purpose of this study was to examine the direct and indirect effect of ethical leadership, organizational justice, organizational support on employee satisfaction and employee engagement. Very little research has been conducted to study those relationships in the socialization context. This paper attempts to fill the gap by analyzing data from a survey of 677 employees from industrial parks. This study used a survey instrument that consists of 2 sections. To ensure content validity, the survey items were derived from those used in previous studies. Each item was measured using a 5-point Likert scale. Ethical leadership scale with ten items were adopted from Toor and Ofori (2009). Partial least square structural equation modeling (PLS-SEM) is employed for testing the structural models and exploratory study is also identified to evaluate the relationship among variables. The findings provided evidence that employee satisfaction is the most important to predict employee engagement. The results also reveal the important effect of ethical leadership, organizational justice and supporting environment on job satisfaction. Implications for public policy practice and further research are also suggested based on the results of structural analysis.
Cao, Van Du,Nguyen, Phuong Phong,Khuong, Vo Quoc,Nguyen, Cuu Khoa,Nguyen, Xuan Chuong,Dang, Cap Ha,Tran, Ngoc Quyen Korean Chemical Society 2014 Bulletin of the Korean Chemical Society Vol.35 No.9
In this paper ultrafine copper nanoparticles (CuNPs) were prepared from copper salt via chemical reduction method with sodium citrate dispersant and polyvinylalcol (PVA) capping polymer. The colloidal CuNPs were characterized by using UV-Visible spectroscopy, Transmission Electron Microscopy (TEM), and X-ray Diffraction (XRD) techniques. Our obtained results indicated that the CuNPs were produced ranging from 2 to 4 nm in diameter. The colloidal solution at 7 ppm of CuNPs exhibited a powerful antifungal activity against Corticium salmonicolor (C. Salmonicolor). Fungal killing assays showed colloid solutions containing 10 ppm of CuNPs killed entirely the cultured fungus. A highly killing activity against the fungus was also performed when the CuNPs were sprayed on pink disease-infected rubber trees. These positive results may offer a great potential to produce CuNPs-based eco-fungicide for pink disease.
Modeling of Doppler Power Spectrum for Underwater Acoustic Channels
Do Viet Ha,Nguyen Van Duc,Nguyen Quoc Khuong 한국통신학회 2017 Journal of communications and networks Vol.19 No.3
In this paper, we propose a closed-form expression of Doppler power spectrum model for underwater acoustic (UWA) channels. Using the geometry model for shallow UWA channels, we analyze the theoretical background of Doppler effects generated by the transmitter/receiver (Tx/Rx) movement, or by the motion of sea-surface. As a result, the Doppler power spectrum can be modeled as a summation of the Spike-shape and the Gaussian-shape. The Spike-shape presents the Doppler component from the Tx/Rx movement, while the Gaussian-shape presents the Doppler component from the sea-surface motion. The proposed model is validated through curve fitting with the Doppler power spectrum measurement results of a real shallow UWA channel in Halong bay, Vietnam. The optimal parameters of the proposed model are derived from the measurement results by applying an optimization algorithm called the Lp-norm method. The curve fitting results show that our proposed model matches well with the measurements. Therefore, the proposed Doppler model can accurately describe the Doppler effects for shallow UWA channels. The proposed model can be used to design UWA channel simulators for the performance evaluation of UWA communication systems.
Van Du Cao,Phuong phong Nguyen,Vo Quoc Khuong,Cuu Khoa Nguyen,Xuan Chuong Nguyen,Cap Ha Dang,Ngoc Quyen Tran 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.9
In this paper ultrafine copper nanoparticles (CuNPs) were prepared from copper salt via chemical reduction method with sodium citrate dispersant and polyvinylalcol (PVA) capping polymer. The colloidal CuNPs were characterized by using UV–Visible spectroscopy, Transmission Electron Microscopy (TEM), and X-ray Diffraction (XRD) techniques. Our obtained results indicated that the CuNPs were produced ranging from 2 to 4 nm in diameter. The colloidal solution at 7 ppm of CuNPs exhibited a powerful antifungal activity against Corticium salmonicolor (C. Salmonicolor). Fungal killing assays showed colloid solutions containing 10 ppm of CuNPs killed entirely the cultured fungus. A highly killing activity against the fungus was also performed when the CuNPs were sprayed on pink disease-infected rubber trees. These positive results may offer a great potential to produce CuNPs-based eco-fungicide for pink disease.