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Synthesis and characterization of bimodal silver nanoparticles by using semi-batch method
Sarawade, P.B.,Kim, S.M.,Kim, K.D.,Kim, H.T. Korean Society of Industrial and Engineering Chemi 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 α-terpineol. The α-terpineol solution of these nanoparticles exhibited a surface plasmon resonance in the range around 430nm. 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.
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).
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.
Hilonga, A.,Kim, J.K.,Sarawade, P.B.,Kim, H.T. North-Holland 2010 Journal of non-crystalline solids Vol.356 No.28
In this study we have examined the properties of sodium alumino silicate (SAS) synthesized by simultaneous addition of sodium silicate and aluminate under controlled reaction conditions. The varied conditions include the concentration of the reactants and the pH (low, neutral, and high); while the stirring speed, precipitating temperatures, and the drying conditions were kept constant. XRD, SEM, and EDS results indicate that the materials developed were amorphous and have irregularly-textured particles. They were rich in Si, Al, O, and Na; and had Na/Al molar ratios of about 0.4 to 1. The SiO<SUB>2</SUB>:Al<SUB>2</SUB>O<SUB>3</SUB> molar ratio in the final product ranges from 2.2 to 5.8 as determined by EDS. FTIR studies confirmed the formation of Si-O-Al bond. Nitrogen physisorption studies were done to examine the surface area and porosity of the final product. The SAS samples examined have bulk density greater than 2.5g/cm<SUP>3</SUP>, pore volume up to 0.85cm<SUP>3</SUP>/g, and the pore diameters between 13 to 20nm. The BET surface area ranges from 80 to 318m<SUP>2</SUP>/g, and oil absorption from 75 to 200ml/100g. The products obtained have desirable properties and are expected to be a potential low-cost alternative as functional fillers for paper and paint industries.
Preparation of amino-functionalized silica for copper removal from an aqueous solution
Quang, D.V.,Kim, J.K.,Sarawade, P.B.,Tuan, D.H.,Kim, H.T. Korean Society of Industrial and Engineering Chemi 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 (331.4m<SUP>2</SUP>/g, 460.1m<SUP>2</SUP>/g, 717.7m<SUP>2</SUP>/g and 1.38cm<SUP>3</SUP>/g, 1.06cm<SUP>3</SUP>/g, 0.57cm<SUP>3</SUP>/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 33.45mg/g was confirmed using the amino-functionalized material at an initial 3-APTMS concentration of 2.52mmol/g. Silica with a BET surface of 331m<SUP>2</SUP>/g and a pore volume of 1.38cm<SUP>3</SUP>/g demonstrated a good copper absorption capacity. Interference species such as pH, NH<SUB>3</SUB> and EDTA were also studied in this work.
Synthesis of mesoporous silica with superior properties suitable for green tire
Hilonga, A.,Kim, J.K.,Sarawade, P.B.,Quang, D.V.,Shao, G.N.,Elineema, G.,Kim, H.T. Korean Society of Industrial and Engineering Chemi 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 37nm was obtained without using surfactants. This is unprecedented step toward synthesis of silica that is suitable for tire industry.