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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
T. Charinpanitkul,W. Tanthapanichakoon,N. Sano 한국물리학회 2009 Current Applied Physics Vol.9 No.3
An idea of using pure iron and graphite electrodes was employed for synthesizing carbon nanoparticles by arc discharge in liquid nitrogen. The synthesized products consist of multiwalled carbon nanotubes (MW–CNT), carbon nanohorns (CNH), and carbon nanocapsules (CNC) with core–shell structure. Effect of metallic cathode and discharge current on product structure and yield had been experimentally investigated. Typical evidence of transmission electron microscopic images revealed that under some certain conditions of discharge in liquid nitrogen the synthesized products mainly consisted of CNCs with mean diameter of 50–400 nm. When conventional graphitic electrodes were employed, CNHs with some MW–CNTs were mainly synthesized. Meanwhile, MW–CNTs with diameter of 8–25 nm and length 150– 250 nm became less selectively synthesized as cathode deposit under the condition of discharge in liquid nitrogen with higher arc current. The production yield of carbon nanoparticles synthesized by either carbon– carbon or carbon–iron electrodes became also lower with an increase in the arc current. An idea of using pure iron and graphite electrodes was employed for synthesizing carbon nanoparticles by arc discharge in liquid nitrogen. The synthesized products consist of multiwalled carbon nanotubes (MW–CNT), carbon nanohorns (CNH), and carbon nanocapsules (CNC) with core–shell structure. Effect of metallic cathode and discharge current on product structure and yield had been experimentally investigated. Typical evidence of transmission electron microscopic images revealed that under some certain conditions of discharge in liquid nitrogen the synthesized products mainly consisted of CNCs with mean diameter of 50–400 nm. When conventional graphitic electrodes were employed, CNHs with some MW–CNTs were mainly synthesized. Meanwhile, MW–CNTs with diameter of 8–25 nm and length 150– 250 nm became less selectively synthesized as cathode deposit under the condition of discharge in liquid nitrogen with higher arc current. The production yield of carbon nanoparticles synthesized by either carbon– carbon or carbon–iron electrodes became also lower with an increase in the arc current.
T. Charinpanitkul,W. Tanthapanichakoon 한국공업화학회 2011 Journal of Industrial and Engineering Chemistry Vol.17 No.3
While activated carbon (AC) is widely employed for treating water resources contaminated with hazardous organic compounds, regeneration of AC after saturation has been a concerning issue. Supercritical water oxidation (SCWO) in a batch reactor was used to regenerate two commercial activated carbons (CAL and COCO) saturated with pyridine or phenol. BET surface area, pore volume and pore size distribution of CAL and COCO were characterized before and after their regeneration. Decomposition of pyridine and phenol was examined at 400, 450, 525℃ with the presence or absence of hydrogen peroxide. The SCWO regeneration efficiency was determined from the amount of pyridine or phenol adsorbed and desorbed in successive adsorption-regeneration cycles. Effects of SCWO on adsorption capacity of CAL and COCO were experimentally investigated. With SCWO enhanced by H_2O_2,adsorbed organic compounds could be converted to carbon dioxide, hydrogen and nitrogen.
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.
T. Charinpanitkul,W. Suthabanditpong,H. Watanabe,T. Shirai,K. Faungnawakij,N. Viriya-empikul,M. Fuji 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.4
ZnO nanoparticles suspended in poly(acrylic acid) (PAA) were deposited onto layer-by-layer (LBL)polyelectrolyte (PET) films fabricated from poly(allylamine hydrochloride) (PAH) and PAA by dip coating method. Effect of etching time and concentration of ZnO suspension on hydrophilicity of the LBL-PET films before and after UV irradiation was examined using water contact angle measurement. 2.0 M PAH/PAA solutions with a dipping speed of 3.0 cm/min provided stable LBL-PET films with thickness sufficient for HCl etching. Glass substrates with the etched LBL-PET film dipped into 0.2 wt.% ZnO suspension exhibited the contact angle of 108 after irradiated by UV for 60 min.
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.
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.
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
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.