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RISS 인기검색어
- 검색키워드
- 저자 : Dickon H.L. Ng (검색결과 6 건)
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Oxidation states of Cu in the CuO/CeO2/Al2O3 catalyst in the methanol steam reforming process
Ka-lok Chiu,Fung-luen Kwong,Dickon H.L. Ng 한국물리학회 2012 Current Applied Physics Vol.12 No.4
The biomorphic CuO/CeO2/Al2O3 was used as a catalyst in methanol steam reforming (SRMe), and the reaction mechanism was studied. It was found that the oxidation states of Cu in the biomorphic sample would vary with the reaction temperature and they also affected the rate of the reaction. Below 200 ℃,SRMe would not occur, and the X-ray diffractometry study indicated that the CuO/CeO2/Al2O3 sample remained unchanged. Above 200 ℃, the SRMe occurred when CuO started to be reduced to Cu. As the reaction temperature increased, Cu reacted with CO2 and led to the formation of Cu2O during the reversed water gas shift reaction. Above 250 ℃, the conversion of MeOH to CO2 and H2 reached to a saturation of 95% even if the amount of metallic Cu was reduced to half of its original portion. This confirmed that both Cu and Cu2O were active components for promoting SRMe.
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Jia Liu,Dickon H.L. Ng,Peng Song,Yi Song,Chao Kong 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.23 No.-
Magnetic ZnFe2O4 hollow fibers were synthesized via a facile bio-template method involving porefabricating and nanoparticle assembling process. The as-prepared kapok-morphic ZnFe2O4 exhibited hollow fiber structure composed of nanocrystallites with grain sizes of 30–50 nm. The adsorption kinetics equilibrium and thermodynamics of acid fuchsin onto ZnFe2O4 were investigated. It was found that the adsorption was spontaneous and exothermic, and the adsorption process was well described by both the Langmuir isotherm model and the pseudo-second order kinetics model. The maximum adsorption capacity of ZnFe2O4 hollow fibers for acid fuchsin was 150.37 mg/g. Electrostatic absorption was conceived as the main adsorption mechanisms.
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Law, Martin,Ng, Dickon H.L.,Yoon, Do-Kun,Djeng, Shih-Kien Korean Nuclear Society 2021 Nuclear Engineering and Technology Vol.53 No.4
To unveil and delineate the elements applicable to the radiation protection of a femoral entry shield, calculate its mass attenuation coefficient, and demonstrate its dose reduction efficacy for interventional radiologist performing transarterial embolization (TAE) of ruptured hepatocellular carcinoma (rHCC). The lead equivalency of the shield was firstly validated. Electron microscopy was used to confirm the femoral entry shield being lead-free and to analyze the elemental content, with which the mass attenuation coefficient of the shield was calculated. An adult phantom, irradiated at the upper abdomen to simulate the TAE of rHCC, was used together with a dosimeter attached to the palm of a hand phantom. The dose rates at the hand phantom were measured, with the rHCC clinical protocol, without and with the femoral entry shield placed over the right femoral access site of the adult phantom. Without using the shield, the average hand dose rate was measured to be 0.325 µSv/sec. While using the shield, it was determined to be 0.110 µSv/sec. There was significant 66% dose reduction to the hand dose of IRs performing angiographic intervention with the femoral entry shield.
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Lu Lu,Jia Li,Dickon H.L. Ng,Ping Yang,Peng Song,Min Zuo 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.46 No.-
Hierarchically porous Fe3O4@MgAl–LDH magnetic microspheres were reported as novel efficientadsorbent for the removal of anionic dye from water. The as-prepared microspheres had vertically/slantly/horizontally oriented platelets-coated morphology, and exhibited superb adsorption capacity of813.0 mg/g for Congo red (CR), which was the highest reported value of magnetic adsorbents. Theadsorption kinetics and isotherm of CR on microspheres followed the pseudo-second-order andLangmuir model, respectively, and the adsorption processes were spontaneous and endothermic innature. The adsorbed samples could be regenerated by methanol, and easily magnetically separated fromaqueous solution. The synthesized materials might act as excellent adsorbents for environmentalprocesses.
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Xiaolei Zhang,Ziying Wang,Yangsai Lyu,Jia Li,Kun Song,Ningning Xing,Dickon H.L. Ng 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.116 No.-
Near-infrared (NIR) light-powered nanomotors with active motion have attracted extensive attention inthe chemo-photothermal therapy of cancer. However, there are also some limitations such as complicatedsynthesis process, low permeability of drugs and viscous physiological environment. Herein, wedeveloped a facile route to synthesize novel NIR light-powered DOX/Au-m-HTAS nanomotor based onnatural halloysite (HNTs) for active chemo-photothermal therapy. Such nanomotor exhibited NIR lightcontrolled on/off motion with a maximum speed of 64.5 lm/s. Owing to the synergetic NIR lightpoweredmotion and chemo-photothermal therapy, DOX/Au-m-HTAS nanomotor could effectivelyadhere tumor cells, leading to deeper cell penetration, higher cellular uptake, and better ablation oftumor cells. Meanwhile, DOX/Au-m-HTAS nanomotors also had enhanced ability for CT imaging of localtumor, demonstrating the enhanced anticancer efficiency. This strategy provided a new insight into thechemo-photothermal synergistic therapy of tumors.
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Conversion of egg shell membrane to inorganic porous CexZr1-xO2 fibrous network
Jia Li,Ka Lok Chiu,Fung Luen Kwong,Dickon H.L. Ng,Sammy L.I. Chan 한국물리학회 2009 Current Applied Physics Vol.9 No.6
The binary system CeO2–ZrO2 is thermally stable and has superior reduction–oxidation properties. It has been commonly used in the three-way catalytic converters for automobiles. In this work, an inorganic biomorphic porous CexZr1-xO2 fibrous network was successfully synthesized by using the egg shell membrane (ESM) as templates, and its morphology was a perfect replica of the original ESM. The synthesis involved a simple infiltration and calcination process. A fresh ESM was peeled from a chicken egg shell. It was soaked in a Ce(NO3)3 and Zr(NO3)4 mixture before it was calcined at 700 ℃ in ambient environment. The fibers in the biomorphic network had diameter ranged from 1 to 4 ㎛, and they were composed of CexZr1-xO2 nanocrystallites having an average grain size of ~10 nm. The binary system CeO2–ZrO2 is thermally stable and has superior reduction–oxidation properties. It has been commonly used in the three-way catalytic converters for automobiles. In this work, an inorganic biomorphic porous CexZr1-xO2 fibrous network was successfully synthesized by using the egg shell membrane (ESM) as templates, and its morphology was a perfect replica of the original ESM. The synthesis involved a simple infiltration and calcination process. A fresh ESM was peeled from a chicken egg shell. It was soaked in a Ce(NO3)3 and Zr(NO3)4 mixture before it was calcined at 700 ℃ in ambient environment. The fibers in the biomorphic network had diameter ranged from 1 to 4 ㎛, and they were composed of CexZr1-xO2 nanocrystallites having an average grain size of ~10 nm.
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