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Synthesis and characterization of bimodal silver nanoparticles by using semi-batch method
Pradip B. Sarawade,김희택,김상민,김기도 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
Synthesis of silver nanoparticles stabilized by myristic acids is reported. Bimodal shape of silver nanoparticles was formed by feed rate control using semi-batch method. The synthesized nanoparticles were re-dispersible in solution such as a-terpineol. The a-terpineol solution of these nanoparticles exhibited a surface plasmon resonance in the range around 430 nm. This broad absorption band depicted that the silver nanoparticles have an enhanced stability with increasing chain length of the fatty acid. The size of nanoparticles was influenced by the experimental conditions such as temperature, feed rate and reaction time. The nanoparticles were characterized by TEM, UV and XRD analyses.
김희택,Pradip Bhikaji Sarawade,Jong-Kil Kim,Askwar Hilonga 한국화학공학회 2010 Korean Journal of Chemical Engineering Vol.27 No.4
The experimental results of aging time and temperature on the textural properties of water-glass (sodium silicate)-based silica aerogels are reported and discussed. Aging of the hydrogel for different times and temperatures led to an ability to increase the stiffness and strength of the networks. These improvements enabled the gel to withstand ambient pressure drying (APD) and, consequently, preserve the highly porous silica network without collapse. The pore size and volume increased with increasing aging temperature and time, while the specific surface area decreased. Monolithic aerogels with extremely low bulk density (~0.069 g/cm3), high specific surface area (820 m2g−1), large cumulative pore volume (3.8 cm3g−1), and high porosity (~96%) were obtained by aging at 60 oC for 18 hours. Therefore,easy synthesis of monolithic silica aerogels at ambient pressure is achievable using a relatively inexpensive silica precursor (sodium silicate).
Preparation of amino-functionalized silica for copper removal from an aqueous solution
Dang Viet Quang,Jong Kil Kim,Pradip B. Sarawade,Dang Huu Tuan,김희택 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.1
In the present research, amino-functionalized silica materials were synthesized to develop absorbents for removing copper (II) ions from water. Three kinds of silica with various BET surface areas and pore volumes (331.4 m2/g, 460.1 m2/g, 717.7 m2/g and 1.38 cm3/g, 1.06 cm3/g, 0.57 cm3/g, respectively) were used to determine an optimum material. 3-Aminopropyltrimethoxysilane (3-APTMS) and N-[3-(trimethoxysilyl)propyl]-ethylenediamine (MSDA) are two amino-functional moieties grafted onto silica surfaces. A maximum copper absorption of 33.45 mg/g was confirmed using the aminofunctionalized material at an initial 3-APTMS concentration of 2.52 mmol/g. Silica with a BET surface of 331 m2/g and a pore volume of 1.38 cm3/g demonstrated a good copper absorption capacity. Interference species such as pH, NH3 and EDTA were also studied in this work.
Synthesis of mesoporous silica with superior properties suitable for green tire
Askwar Hilonga,Jong-Kil Kim,Pradip B. Sarawade,Dang Viet Quang,Godlisten N. Shao,Gideon Elineema,김희택 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.5
In this article we report synthesis of mesoporous silica with superior properties for application in green tire (environmentally friendly tire) as filler. The synthesis was done using a newly innovated apparatus which produce mesoporous silica with superior properties. The desired superior properties are big pore size, optimum BET, large pore volume, uniform properties, and improved performance in real application as tire filler. Mesoporous silica was characterized by BET method and final product with a pore diameter of up to 37 nm was obtained without using surfactants. This is unprecedented step toward synthesis of silica that is suitable for tire industry.
Two-step rapid synthesis of mesoporous silica for green tire
Askwar Hilonga,김희택,Jong-Kil Kim,Pradip Bhikaji Sarawade,Dang Viet Quang,Godlisten Namwel Shao,Gideon Elineema 한국화학공학회 2012 Korean Journal of Chemical Engineering Vol.29 No.11
We report a two-step rapid route of synthesizing inexpensive mesoporous silica using the waste material (hexafluorosilicic acid, H2SiF6) of phosphate fertilizer industry and sodium silicate (Na2O·SiO2). The reaction was performed in a newly innovated manufacturing apparatus. This apparatus produces mesoporous silica with uniform properties through controlled mixing of source materials at predetermined equivalent ratio. The precursors are rapidly mixed within the nozzles to enable uniform control of physical properties of the final product. The obtained mesoporous silica was characterized using N2 physisorption studies, scanning electron microscope (SEM), and EDS. The final product was found to have superior properties that are suitable for green tire (environmentally friendly tire) as inorganic filler. The process reported in this study may significantly reduce the release of hazardous materials into the environment and it might confer economic benefits to the responsible industries. A project on innovative industrial application of our products for the tire industry is in progress.
Gideon Elineema,김희택,김종길,Askwar Hilonga,Godlisten Namwel Shao,김유나,Pradip B. Sarawade,Dang Viet Quang 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.1
This study reports on the quantitative recovery of high purity nanoporous silica from wastes material (H2SiF6) of the phosphate fertilizer industry and Na2O·SiO2. The silica recovered from the wastes was compared with silica from the reaction of H2SO4 and Na2O·SiO2 because H2SO4 is commonly used. The product recovered from the wastes material and H2SO4 were 99.3% and 99.1% pure, respectively. The quantity recovered were 22.30 g and 20.11 g, respectively. The product had superior properties suitable for applications such as chromatography, reinforcing material for rubber and plastics. The process may significantly reduce the release of SiF4 gas into the environment.