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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal DOI :
The Korean Society of Clean Technology
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Volume & Issues
Volume 13, Issue 4 - Dec 2007
Volume 13, Issue 3 - Sep 2007
Volume 13, Issue 2 - Jun 2007
Volume 13, Issue 1 - Mar 2007
Selecting the target year
Risk Assessment for Health and Environmental Hazards of Nanomaterials
Kim, Mi-Sug ; Choi, Kyung-Hee ; Kim, Young-Hun ; Yi, Jong-Heop ;
Clean Technology, volume 13, issue 3, 2007, Pages 161~172
Fusion technology based on the nanotechnology should be introduced to clean technology for the breakthrough advances. Today, nanoparticles, nanotubes and other engineered nanomaterials are already in use in hundreds of everyday consumer products, and these materials are able to move around the human and environmental mediamore readily than larger particles of pollution. Because of their extremely small size and large surface area, nanoparticles are known to be more reactive and toxic than larger particles. Consequently, this feature raised many concerns of significant health, safety and environment. Herein, we reviewed risk assessment for health and environmental hazards of nanomaterials, and then revealed the potential hazardous of nanomaterials.
Sorption Equilibria of C. I. Disperse Yellow 54 Dye between Supercritical Carbon Dioxide and PTT and PET Textiles
Ihm, Bang-Hyun ; Choi, Jun-Hyuck ; Shim, Jae-Jin ;
Clean Technology, volume 13, issue 3, 2007, Pages 173~179
In this study the amount of equilibrium sorption of C.I. Disperse Yellow 54 dye in the polymeric textiles such as PTT (poly(trimethylene terephthalate)) and PET (poly(ethylene terephthalate)) textiles was measured in the presence of supercritical carbon dioxide at different temperatures, pressures, and time. The amount of dye sorption increased with temperature and pressure in both PTT and PET textiles, but the increasing rate decreased with pressure. The PTT textile has much larger dye sorption than PET textile. The increasing rate of dye sorption decreased with time at same temperature and pressure for both PTT and PET textiles.
Synthesis of ITO Nano-Particles by a SAS Method and Preparation of Conductive Film by Coating Them
Kim, Moon-Sun ; Yun, Sang-Ho ; Kim, Byung-Woo ;
Clean Technology, volume 13, issue 3, 2007, Pages 180~187
The indium tin oxide(ITO) film on PET was prepared by a wet coating method to obtain the transparent film with a high conductance. ITO nano-particles was synthesized by a SAS method at 15 MPa and
, where optimized rate of In/Sn was 65. Average diameter and resistivity of ITO obtained from SAS are
. Coating solution was prepared at pH 10. The ITO film was obtained by solution including 0.1 0.5, 1, and 2 ITO wt% on PET. Roughness(Ra) of ITO film with 0.1, 0.5, 1. and 2 ITO wt% is 4, 10, 12, and 16 nm. Resistivity with an increasing ITO concentration is
. Transmissivity of ITO film decreased as 89, 88, 86, and 82% with an increasing ITO concentration as 0.1, 0.5, 1, and 2 wt%.
Improvement of Reaction Yield in the Shadow Mask Green Recycling Process
Yoon, Mun-Kyu ; Koo, Kee-Kahb ; Lee, Moon-Yong ;
Clean Technology, volume 13, issue 3, 2007, Pages 188~194
In the present study, we developed a methodology to minimize a waste solution produced in the etching process. The condition for the optimization of the GRS process was studied on the basis of laboratory experiment and field test as well as pilot test. Through the study, we analyse the relation of the main process variables and the yield of the GRS process. The application of the new operation condition and the reactor internal modification results in 10% yield improvement in the GRS process and accordingly decreases a wasted solution.
Flow Rate Changes in the Heterogeneous Rectangular Microchannels with Different Hydrophilicity for the PDMS Bottom Surface
Noh, Soon-Young ; Lee, Hyo-Song ; Kim, Ki-Ho ; Choi, Jae-Ho ; Yu, Jae-Keun ; Yoon, Soo-Kyung ; Rhee, Young-Woo ;
Clean Technology, volume 13, issue 3, 2007, Pages 195~200
This study investigated the flow rate changes of the heterogeneous rectangular microchannels which have different hydrophilic property on the bottom surface. The heterogeneous rectangular microchannel has three native PDMS (poly-dimethyl siloxane) surfaces which were patterned by the soft lithography. PDMS bottom surface was treated by the argon plasma and coated by the allyl alcohol (99%). The channel length was 10, 20 and 30 mm and the channel width was 100, 200 and
, respectively. Several external voltages were applied to make the fluid flow by the electroosmosis in the microchannel. For the same electric field strength and hydrophilicity of the bottom surface, the flow rate is almost same. This result is matched to the theoretical expectation and confirms that the experimental system is reliable. With increasing the channel width, the flow rate increased for the same hydrophilicity of the bottom surface. The flow rate of the microchannel of higher hydrophilicity was larger than that of the microchannel of lower hydrophilicity. This result implies that the hydrophilicity change of the bottom surface could be applied to control the flow rate in the microchannel.
A Study on the Environmentally Friendly Water-Soluble Fiber
Park, Jong-Jin ; Gaur, Ankur ; Song, Ho-Jun ; Yoo, Seung-Kwan ; Park, Jin-Won ;
Clean Technology, volume 13, issue 3, 2007, Pages 201~207
Carboxymethylcellulose (CMC), which is water-soluble at room temperature, was synthesized from cellulose in this study. Experimental parameters included reaction temperature, time, concentration of NaOH, and monochloroacetic acid (MCA). In mercerization and etherification, solubility and degree of substitution (DS) increased when NaOH (or MCA) concentration increased and maximum solubility and DS were achieved when NaOH or MCA was 30%. The effect of MCA concentrations on the DS was larger than that of the NaOH concentration. Tensile strength of the CMC was decreased by the increases of reaction time, reagent concentration and reaction temperature. Tensile strength also decreased by NaOH and MCA. However, low decrease of tensile strength was observed in near neutral region.
Polymerization of Environmentally Friendly Acrylic Resin by Non-Aqueous Dispersion
Oh, Dae-Geun ; Kim, Jeong-Ho ;
Clean Technology, volume 13, issue 3, 2007, Pages 208~214
Environmentally-friendly acrylic resin particles having the diameter between
were prepared using non-aqueous dispersion (NAD) polymerization technique. The first step is to prepare the stabilizer and the next step is the NAD polymerization by dropping an acrylic monomer to stabilizer dispersed in organic media. To obtain a NAD resin with proper level of viscosity, it fumed out that stabilizers having sufficient viscosity such as 1000 cP need to be used, for which the stepwise feeding of monomer and initiator was necessary. It was necessary to put proper amount of stabilizer, but no more increase in viscosity was observed when more than that amount of stabilizer was added. Choice of proper monomers considering solubility parameter was essential to avoid the bimodal particle size distribution in the NAD resin product.
Biosorption of Reactive Dyes using Chemically Modified Sewage Sludge
Han, Min-Hee ; Choi, Gi-Wook ; Yun, Yeoung-Sang ;
Clean Technology, volume 13, issue 3, 2007, Pages 215~221
Biosorption is considered to be a promising alternative to replace the present methods for the treatment of dye-containing wastewater. In this study, sewage sludge was used as a biosorbent which could be one of the cheapest and most abundant biomaterials. The objective of this work is to develop a surface-modified biosorbent with enhanced sorption capacity and binding affinity. The FT-IR and potentiometric titration studies revealed that carboxyl, phosphateand amine groups played a role in binding of dye molecules. The binding sites for reactive dye Reactive Red 4 (RR 4) were identified to be amino groups present in the biomass. In this work, based on the biosorption mechanism, the performance of biosorbentcould be enhanced by the removal of inhibitory carboxyl groups from the biomass for practical application of the biosorbents. As a result, the maximum capacity of biomass was increased up to 130% and 210% of the increment of sorption capacity at pH 2 and 4, respectively. Therefore, chemically modified sewage sludge can be used as an effective and low-cost biosorbent for the removal of dyes from industrial discharges.
Optimization and Characteristics of Removal Condition of Livestock Wastewater Using a Photocatalytic Process
Park, Jae-Hong ;
Clean Technology, volume 13, issue 3, 2007, Pages 222~227
The photocatalytic degradation of livestock wastewater has been investigated over
photocatalysts irradiated with a ultraviolet (UV) light. The effect of operational parameters, i.e., distance, reaction area, concentration of suspended solids(SS), and column diameter on the degradation of livestock wastewater has been performed in lab-scale. The optimal conditions for livestock wastewater were determined: distance was 3 cm (less than 7 cm), reaction area was
, SS concentration was 40 mg/L (less than 300 mg/L) and column diameter was 5 mm (less than 10 mm). Under the optimal conditions, COD, color and coliform removal efficiencies were approximately 49%, 53% and 100%, respectively. Non-biodegradable COD removal efficiency increased with 57% using by photocatalysis process. Therefore, it is shown that photocatalysis has an effect on degradation of non-biodegradable organic matter.
Evaluation of the Productivity and Environmental Effects of Laser Aided Direct Metal Deposition Process for Remanufacturing
Chang, Yoon-Sang ;
Clean Technology, volume 13, issue 3, 2007, Pages 228~234
In this study, the productivity and environmental effects of laser aided direct metal deposition (LADMD) process which is one of promising rapid manufacturing technology is evaluated. The production time predicted using PowerMill shows that the productivity of LADMD is superior to that of conventional milling process. Though LADMD is known as an environment-friendly technology, it has a disadvantage to utilize much energy to generate laser beam. Considering both productivity and environmental effects, LADMD is expected to be widely used in remanufacturing industry.