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Tawatchai Charinpanitkul,Benjapol Kongsombut,Wei Chen,Atsushi Tsutsumi,Wiwut Tanthapanichakoon 한국화학공학회 2008 Korean Journal of Chemical Engineering Vol.25 No.4
Rapid expansion of supercritical solution (RESS) was used for preparing polymer particles and polymer coating of ultra fine powders. The polymer of pharmaceutical interest was Poly(lactic-co-glycolic acid) (PLGA with PLA : PGA ratio of 85 : 15 and MW of 50,000-75,000) and the simulated core particles were 1.4-μm SiO2 and 70- nm TiO2 particles. The supercritical solution was prepared by dissolving PLGA in supercritical carbon dioxide with ethanol as a cosolvent. Supercritical solution of CO2-PLGA was sprayed through capillary nozzles to ambient conditions, resulting in formation of submicron PLGA particles. Similarly, rapid expansion of supercritical solution of CO2- PLGA suspended with the core particles could provide solvent evaporation and deposition of submicron PLGA particles on the surface of the core particles, resulting in the formation of coating films on dispersed particles of SiO2 and agglomerates of TiO2. The influences of the core particle size, spray nozzle diameter as well as powder-to-polymer weight ratio were also investigated and discussed with respect to the coating performance
Optical transmission of greenhouse film prepared from composite of polyethylene and microsilica /
Charinpanitkul, Tawatchai,Ruenjaikaen, Kridsada,Sunsap, Piyabutr,Wijitamornlert, Arthorn,Kim, Kyo Seon THE KOREAN SOCIETY OF INDUSTRIAL AND ENGINEERING 2007 JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY -S Vol.13 No.6
Tawatchai Charinpanitkul,Pat Nartpochananon,Thornchaya Satitpitakun,Jenifer Wilcox,Takafumi Seto,Yoshio Otani 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.1
Facile synthesis of tetrapodal ZnO nanoparticles was conducted using a modified French process in which oxygen and nitrogen flow rates were controlled. The synthesized ZnO nanoparticles exhibit photoluminescent characteristics depending on the synthesis conditions. Electron microscopic analysis revealed that the tetrapodal nanostructure of ZnO with high crystallinity which was confirmed by XRD analyses could be controlled by a variation of O2/N2 feed ratio. Typical photoluminescence with UV and blue emission of the tetrapodal ZnO nanoparticles was influenced by the particle size and crystallinity,which is manipulated by the oxidation condition.
Analysis of Microstructure and Properties of Autoclaved Aerated Concrete Wall Construction Materials
Tawatchai Charinpanitkul,Yothin Ungkoon,Chadchart Sittipunt,Pichai Namprakai,Wanvisa Jetipattaranat,Kyo-Seon Kim 한국공업화학회 2007 Journal of Industrial and Engineering Chemistry Vol.13 No.7
Microstructure analyses in non-autoclaved aerated concrete (Non-AAC) and autoclaved aerated concrete (AAC) were conducted using optical microscopic and scanning electron microscopic (SEM) methods, while their chemical analyses were also carried out using X-ray diffraction (XRD). Laboratory investigation including physiothermal properties and field tests using four lab-scale houses built with the Non-AAC and AAC blocks were also compared. It could be observed that the AAC exhibited properties superior to that of the Non-AAC. Interestingly, the AAC blocks could provide lower humidity accumulation than the Non-AAC blocks, resulting in possibility to prevent mold growth in such construction materials.
Effect of arc current on characteristics of nanocarbons prepared by cryogenic arc discharge method
Tawatchai Charinpanitkul,Kijchai Kanjanaprapakul,Nattaporn Leelaviwat,Nayot Kurukitkoson,김교선 한국공업화학회 2010 Journal of Industrial and Engineering Chemistry Vol.16 No.6
A variety of nanocarbons (nanohorns, nanoflowers and nanoclusters) could be prepared by arc discharge in cryogenic nitrogen with either graphite–graphite or iron–graphite electrodes manipulated by a strategy of automatic electrode delivering. Based on local thermal equilibrium assumption, magnetohydrodynamic equations were taken into account for estimating the arc power efficiency of 60–84%,depending on the electrode combination. The effects of arc current on the morphology and yield of nanocarbons were investigated within a range of 75–150 A. Transmission electronmicroscopic analyses revealed that the synthesized product consisted of single-walled carbon nanohorns and multi-walled carbon nanoflowers with nominal diameters of 100–200 nm when graphite–graphite electrodes were employed but nanoclusters containing Fe nanoparticles inside carbon nanoshells with smaller size of 70–120 nm were mainly synthesized by iron–graphite electrodes subject to arc discharge in cryogenic nitrogen. 2010 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
Dependence of zinc aluminate microscopic structure on its synthesis
Tawatchai Charinpanitkul,Pattama Poommarin,Akkarat Wongkaew,Kyo-Seon Kim 한국공업화학회 2009 Journal of Industrial and Engineering Chemistry Vol.15 No.2
Alumina doped with zinc oxide was synthesized by sol–gelmethod in alcohol solution. Hybrid oxides of aluminum and zinc were prepared from various aluminum precursors (aluminum sec-butoxide, aluminum nitrate, and aluminum isopropoxide) and zinc acetate solution with ethylacetoacetate and nitric acid as a chelating agent and catalyst, respectively. Types and molar ratio of the precursor to the chelating agent and acidic catalyst were found to remarkably affect the formation of transparent sol of aluminium–zinc sol composite. With relatively low temperature of 50℃, the suitable molar ratio of aluminum sec-butoxide to ethylacetoacetate to nitric acid for preparing the homogeneous sol was 1:0.40:0.86. Furthermore, the calcination at elevated temperature higher than 400℃ would be essential for preparing ZnAl2O4 with the face centered cubic microstructure. The primary crystalline size of the synthesized zinc aluminate nanostructure was approximately 20 nm with lattice spacing of 0.55 nm. 2009 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
Tawatchai Charinpanitkul,Wiwut Tanthapanichakoon,Poj Kulvanich,Kyo-Seon Kim 한국공업화학회 2008 Journal of Industrial and Engineering Chemistry Vol.14 No.5
Influence of fluidizing air velocity, temperature and atomizing air pressure, as well as types of raw materials on the size distribution, shape and flow properties of pharmaceutical granules, which were tabletized using a single punch tableting machine, was experimentally investigated. The granules prepared at the fluidizing air velocity of 0.8 m/s had average particle size larger than those obtained at higher air velocity. Meanwhile the fluidizing air temperature had moderate effect on the average particle size of the granules. However, an increase in the atomizing air pressure resulted in an increase in amount of fine particles, leading to the smaller mean particle size. From microscopic analysis, a primary lactose particle wetted by binder had several contact points with other particles inside the prepared granules. Based on granule morphology, it can be implied that the granules are formed by the so-called snowballing mechanism, leading to the relatively spherical structure. In tabletization, the granules with higher average particle size provided tablets with the less weight variation and friability. Meanwhile, the tablets produced from lactose–corn starch mixture had shorter disintegration time than those of lactose powder only.
Computational Analysis on Fluid Dynamics During the Flame Synthesis of TiO2 Nanoparticles
Piyabutr Sunsap,Kyo-Seon Kim,Dong-Joo Kim,Tawatchai Charinpanitkul,Woo-Sik Kim,Tawatchai Charinpanitkul 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.4
A computational method was used to simulate the gas temperature, velocity and species composition profiles in the diffusion flame reactor during the CH₄ combustion, the titanium-tetra-isopropoxide (TTIP) decomposition to form TiO₂ and the filtration of TiO₂ particles. The effects of various O₂ and CH₄ flow rates on the gas temperature and velocity are illustrated. An increase in the O₂ flow rate reduces slightly the flame temperature but enhances significantly the gas velocity and the heat convection rate. An increase in the CH₄ flow rate leads to an increased flame temperature and gas velocity. The deposition rate of TiO₂ particles on the filter was calculated along the height of the filter for various O₂ and CH₄ flow rates. An increase in the O₂ flow rate can enhance the deposition rate of TiO₂ particles clearly, while an increase in CH₄ flow rate decreases the deposition rate of TiO₂ particles on the filter slightly. The deposition rate increases as higher positions of the filter. A computational method was used to simulate the gas temperature, velocity and species composition profiles in the diffusion flame reactor during the CH₄ combustion, the titanium-tetra-isopropoxide (TTIP) decomposition to form TiO₂ and the filtration of TiO₂ particles. The effects of various O₂ and CH₄ flow rates on the gas temperature and velocity are illustrated. An increase in the O₂ flow rate reduces slightly the flame temperature but enhances significantly the gas velocity and the heat convection rate. An increase in the CH₄ flow rate leads to an increased flame temperature and gas velocity. The deposition rate of TiO₂ particles on the filter was calculated along the height of the filter for various O₂ and CH₄ flow rates. An increase in the O₂ flow rate can enhance the deposition rate of TiO₂ particles clearly, while an increase in CH₄ flow rate decreases the deposition rate of TiO₂ particles on the filter slightly. The deposition rate increases as higher positions of the filter.
Numerical analysis on premixed combustion of H2–SiCl4–Air system to prepare SiO2 particles
NASONOVAANNA,박동화,Tawatchai Charinpanitkul,Kyo Seon Kim 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.1
In this study, we used the commercial CFD-code FLUENT to analyze numerically the hydrogen combustion and SiO2 particle formation in the premixed flame reactor. We considered SiCl4 as a precursor for SiO2 particle formation and calculated the profiles of fluid flow, temperature, species concentration and reaction rates for 2D premixed reactor model in FLUENT. Using the data for temperature and velocity extracted from FLUENT, we calculated the trajectories and temperature histories of SiO2 particles moving inside the premixed flame reactor and those particles starting near the centerline of reactor pass through the maximum temperature histories.
Effect of Pt or Pd doping on stability of TiO2 nanoparticle suspension in water
Komkrit Suttiponparnit,Tawatchai Charinpanitkul,Vinay Tiwari,Manoranjan Sahu,Pratim Biswas,Sirikalaya Suvachittanont 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.1
Stability of suspensions of TiO2 nanoparticles synthesized by the flame aerosol reactor (FLAR) could be altered by doping TiO2 nanoparticles with Pt, Pd, or Pt–Pd dopants. It was found that doping of TiO2 with Pd or Pt could contribute to the control of the agglomeration of TiO2 suspended in water. With the change of doping content, the isoelectric point (IEP) of stable TiO2 suspension decreased gradually from 5 to 3.6while the specific surface area was increased from 43.27 to 60.84 m2/g. With pH > 6.0, 2 wt% Pt–Pd/TiO2suspension exhibited the lowest agglomeration behavior. The plausible intrinsic structures of Pt, Pd, and Pt–Pd doped TiO2 nanoparticles were proposed and discussed with respect to their IEP based on the DLVO theory.