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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.
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.
Nguyen Ngoc Duy Phuong,Mai Ngoc Khuong,Le Huu Phuc,Le Nguyen Thanh Dong 한국유통과학회 2018 The Journal of Asian Finance, Economics and Busine Vol.5 No.3
The purpose of this study was to examine the effect of two-dimensional factor of motivators and hygiene on civil servants’ job satisfaction using the partial least square structural equation modeling (PLS-SEM) as a technique employed to analyze the measurement and structural models. Exploratory study was deployed to evaluate the relationship among variables. By using multistage stratified sampling, statistical data was collected from a survey of 441 public municipal civil servants who have employed in various levels (municipal government, districts and communes) in Vietnam. The findings provided evidence that hygiene factors (relationship with leader, salary, relationship with coworker and working environment) directly impact on civil servants’ job satisfaction. Meanwhile, only career development factor from motivators significantly influenced on public employee’s job satisfaction. Based on the empirical results, the hygiene factors of job satisfaction are more dominated that the motivators one. This finding suggests that municipal governments should focus policies on improving the hygiene factors which lead to higher job satisfaction on civil servants. Gaining a thorough understanding of the determinants of job satisfaction toward municipal public servants will enable policy makers to grasp the factors that results in retaining employees. Finally, the policy makers can use this knowledge to promote civil servants’ job satisfaction.
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 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.
Intra-Organizational Factors Affecting Business Performance: An Empirical Study in Vietnam
Khuong Ngoc MAI,Thao Thi Thanh NGUYEN,Phuong Ngoc Duy NGUYEN,Khoa Tien TRAN 한국유통과학회 2021 The Journal of Asian Finance, Economics and Busine Vol.8 No.10
In the era of industry 4.0 with the robust digital transformation, especially under the trigger of the Covid-19 pandemic, the process of transforming businesses to achieve the desired business performance depends much on the mindset transformation of each member of the organization, beginning with the thoughts of leadership and stakeholders. This study will evaluate the relationship between leadership’s strategic reasoning perspectives on employee engagement or commitment and the company’s reputation, thereby directly or indirectly affecting organizational performance. The study examines data from 382 companies out of 500 samples in typical industries in Vietnam using the exploratory factor analysis (EFA) and partial least squares structural equation modeling (PLS-SEM) techniques. The results show that holistic thinking is closely related to employee retention and corporate reputation, thereby increasing the business outcomes of the organization, whereas there was no evidence to support analytical thinking in this study. As a consequence, transforming the business to achieve the desired business performance is heavily reliant on changing the mindset of each member of the organization, beginning with the top leaders and influencers of the business. This will assist Vietnamese leaders in gaining a comprehensive understanding of corporate governance and controlling the relationships between organizational constructs.
( 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.
Nguyen Ngoc Duy Phuong,Mai Ngoc Khuong,Le Huu Phuc,Le Nguyen Thanh Dong 한국유통과학회 2017 KODISA ICBE (International Conference on Business Vol.2017 No.-
The purpose of this study was to examine the effect of two-dimensional factor of motivators and hygiene on civil servants’ job satisfaction by the partial least square structural equation modeling (PLS-SEM) as a technique employed to analyze the measurement and structural models. 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. Exploratory study was identified to evaluate the relationship among variables. By using multistage stratified sampling, statistical data was collected from a survey of 441 public municipal civil servants who have employed in various levels (municipal government, districts and communes) in Vietnam. The findings provided evidence that hygiene factors (relationship with leader, salary, relationship with coworker and working environment) directly impact on civil servants’ job satisfaction. Meanwhile, only career development factor from motivators significantly influenced on public employee’s job satisfaction. The theoretical and practical significances of the study were discussed and public policy implications were suggested to the provincial government.