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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal Basic Information
Journal DOI :
The Korean Society of Clean Technology
Editor in Chief :
Volume & Issues
Volume 15, Issue 4 - Dec 2009
Volume 15, Issue 3 - Sep 2009
Volume 15, Issue 2 - Jun 2009
Volume 15, Issue 1 - Mar 2009
Selecting the target year
Stripping of High-Dose Ion-Implanted Photoresist Using Co-solvent and Ultra-sonication in Supercritical Carbon Dioxide
Kim, Seung-Ho ; Lim, Kwon-Taek ;
Clean Technology, volume 15, issue 2, 2009, Pages 69~74
A high-dose ion-implanted photoresist (HDIPR) was stripped off from the surface of a semiconductor wafer by using a mixture of supercritical carbon dioxide and a co-solvent. The additional ultrasonication improved the stripping efficiency remarkably and thus reduced the stripping time by supplying physical force to the substrate. We investigated the effect of co-solvents, co-solvent concentration, and stripping temperature and pressure on the stripping efficiency. The wafer surfaces before and after stripping were analyzed by scanning electron microscopy and by an energy dispersive X-ray spectrometer. The HDIPR could be stripped off completely in 3 min with 10%(w/w) acetone/sc
mixture at 27.6 MPa and 343 K.
Development of PSA Process for Medical Oxygen Generator
Choi, Jae-Wook ; Na, Byung-Ki ;
Clean Technology, volume 15, issue 2, 2009, Pages 75~80
In order to separate oxygen from air, the effects of feed gas flow rate and rinse gas flow rate on the product purity and flow were examined using 2 bed PSA with 4 step cycle. The addition of product pressurization step increased the product purity and flow rate. The addition of pressure equalization increased the product flow rate. The test product was manufactured and the purity and flow rate of product oxygen was examined. The results were compared with the commercial medical oxygen generator of 5
and 90% oxygen purity.
A Study on the Cleanliness Evaluation Methods for the Selection of Alternative Cleaning Agents
Shin, Jin-Ho ; Lee, Jae-Hoon ; Bae, Jae-Heum ; Lee, Min-Jae ; Hwang, In-Gook ;
Clean Technology, volume 15, issue 2, 2009, Pages 81~90
In this study various cleaning evaluation methods were tested and comparatively evaluated to help cleaning industry. In order to select alternative cleaning agents objectively and systematically, various cleaning evaluation methods such as gravimetric, optically simulated electron emission (OSEE), contact angle, and analytical instrument methods were employed for cleaning contaminants such as flux, solder and grease. The analytical instruments used in this work were Fourier transform infrared spectroscopy (FTIR), ultraviolet visible spectroscopy (UV-VIS) and high performance liquid chromatography (HPLC). The gravimetric method was able to measure cleaning efficiencies easily and simply, but it was not easy to analyze them precisely because of its limitation in the gravimetric measurement. However, the OSEE technique was able to measure quickly and precisely the clean ability of cleaning agents in comparison with the gravimetric method. The contact angle method was found to be necessary for taking special precaution in its application to the cleaning evaluation due to possible formation of tiny organic film on the substrate surface which might be generated from contaminants and cleaning agents. In case of precision analysis that cannot be done by gravimetric method, fine analytical instruments such as UV-VIS, FTIR and HPLC could be used in analyzing trace amount of flux, solder and grease quantitatively, which were extracted from the surface by special solvents.
A Study on the Substitution of Cr-containing Metal Complex Dyestuff with Reactive Dyestuff
Park, Young-Hwan ; Kim, Moon-Jung ; Lee, Hea-Jung ; Lim, Jae-Ho ; Ryu, Tae-Soo ;
Clean Technology, volume 15, issue 2, 2009, Pages 91~101
The metal complex dyes that are mainly used for good color fastness in dyeing amide fibers with highly concentrated colors usually contain toxic chromium. The remaining dye in th dyebath containing
causes not only environmental problems but also serious damages to human health. In this study, we applied reactive dyestuff for dyeing wool and nylon in order to substitute heavy metal dyestuff. The dyeing properties of reactive dyestuff in fibers as well as their absorption rates and fastness according to color concentration were investigated. By analyzing the quantity of heavy metals and toxic amine of reactive dyestuff, we investigated their harmfulness trends quantitatively. By comparing the reactive dyes with traditional metal complex dyes, we tried to find out the possibility of the reactive dye being a clean dyes in the future.
Rheological and Thermal Properties of PLA Nano-composite Modified by Reactive Extrusion
Kang, Gyeoung-Soo ; Kim, Bong-Shik ; Shin, Boo-Young ;
Clean Technology, volume 15, issue 2, 2009, Pages 102~108
In this study, poly(lactic acid) (PLA) was modified by reactive extrusion with a functional monomer GMA(glycidyl methacrylate), MMT(montmorillonite), and initiator to enhance the melt strength. Each modified PLA was prepared with different amounts of GMA and MMT and was characterized by measuring thennal- and melt-viscoelastic properties. The degree of dispersion of MMT was measured by X-ray diffraction(XRD) and transmission electron microscopy(TEM). The glass transition temperature(
) of modified PLA-GMA-MMT nanocomposite decreased with increasing GMA content, but was a little affected by the amount of MMT. Surface analysis showed that the nanocomposite became more intercalated than exfoliated as the amount of MMT increases. The complex viscosity and storage modulus of the nano-composite were greatly increased by addition of MMT.
Liquefaction Characteristics of Polyethylene-Polypropylene Mixture by Pyrolysis at Low Temperature
Cho, Sung-Hyun ; Choi, Hong-Jun ; Na, Byung-Ki ; Lee, Bong-Hee ;
Clean Technology, volume 15, issue 2, 2009, Pages 109~115
The low temperature pyrolysis of polyethylene (PE), polypropylene (PP) and polyethylene-polypropylene (PE-PP) mixture in a batch reactor at the atmospheric pressure and
was carried out to investigate the synergy effect of PE-PP mixture. The pyrolysis time was from 20 to 80 mins. The products formed during pyrolysis were classified into gas, gasoline, kerosene, gas oil and heavy oil according to the petroleum product quality standard of Korea Institute of Petroleum Quality. The analysis of the product oils by GC/MS showed that no new component was detected and no synergy effect was made by mixing of PE and PP. Conversions and yields of PE-PP mixtures were linearly dependent on the mixing ratio of samples.
Effect of Indirect Oxidation on the Design of Sewage/wastewater Reuse System with an Electrolysis Reactor
Shin, Choon-Hwan ;
Clean Technology, volume 15, issue 2, 2009, Pages 116~121
In this paper, we investigated the effect of an indirect oxidation zone in an electrolysis reactor that used Ti/
as the anode and SUS 316L as the cathode. Based on our preliminary results, the electrolysis reactor was operated with pole plate interval of 6 mm, current density 1.0
and electrolyte concentration 15%. The removal efficiency, COD (chemical oxygen demand), was additionally increased by 55% and 12.5
15.0% in the direct and indirect oxidation zones, respectively. The removal efficiencies of T-N (total nitrogen) and T-P (total phosphorus) were found to be 88% and 75%, respectively. It was shown that the additional effect of the indirect oxidation zone on the removal was nearly negligible. Also, as the removal of COD,T-N and T-P took place during the initial2
5 days of reaction, it was concluded that there was no need to extend the retention time of the electrolysis reactor.
Direct Decomposition of Nitrous Oxide over Fe-beta Zeolite
Park, Jung-Hyun ; Jeon, Seong-Hee ; Khoa, Nguyen Van ; Shin, Chae-Ho ;
Clean Technology, volume 15, issue 2, 2009, Pages 122~129
The effect of calcination temperature or hydrothermal treatment of commercial Fe-beta zeolites in the range of
were examined in the direct decomposition of
. Fe-beta zeolites used were characterized using XRD,
MAS NMR and XPS. Although the surface area and micropore volume of Fe-beta zeolite after calcination at
and hydrothermal treatment at
decreased ca. 30%, a larger decrease in the surface area and micropore volume by hydrothermal treatment was observed than by calcination treatment alone. However, the Al sites in frameworks of zeolite were conserved in stable tetrahedral form resulting from low degree of dealumination which was related to the adjacent Fe ions on the Al sites. This could likely be correlated with the conservation of high surface area and micropore volume of Fe-beta zeolites. The increase in the calcination or hydrothermal treatment temperature caused the increase of decomposition temperature of
and the severe deactivation was observed after hydrothermal treatment than calcination treatment.
Hydrogen Production by Methanol Steam Reforming over Micro-channel Reactor
Lee, Jin-Woo ; Jeon, Hye-Jeong ; Hong, Sung-Chang ;
Clean Technology, volume 15, issue 2, 2009, Pages 130~136
Commercial catalyst (Cu-Zn/
, Johnson Matthey Co., 83-3 Catalyst) was applied to the hydrogen production by steam reforming of methanol in the micro-channel reactor (MCR). The steam reforming of methanol was tested over Cu-Zn catalyst at temperatures in the range of 200 and 300
, the catalyst size of 0.05
2.2 mm, the space velocity of 3,000
in a fixed bed continuous flow reactor. The conversion of methanol and the yield
preferred high temperatures and low space velocities, and had optimal results with the particle size of 0.35 mm. Based on the results from experiments with fixed bed reactor, two types of MCR, boat bed and stacked bed MCRs, were studied. The stacked bed type MCR showed better methanol conversion compared with the boat type one.
A Performance Analysis of the Cleaner Production Program ECOPROFIT for Korean Regional Industry
Ju, Hong-Shin ; Cho, Byung-Oke ; Park, Jung-Gu ;
Clean Technology, volume 15, issue 2, 2009, Pages 137~145
In this study, Austrian cleaner production program, ECOPROFIT, was introduced to 15 companies in Korea. The performance and the proposed options of the program were compared with those of Austria. Various options such as good housekeeping, process changes, internal/external recycling, substitution of raw materials were suggested for domestic companies. There are something in common between Korea and Austria such as no relation between company sizes and derived options and good housekeeping as a major option. The difference is that 1.9 years of recovery period on investment is required in Korea, while only 0.5 year is required in Austria. The reason for not applying the suggestions was due to the priority of the company policies in Korea, but was due to the technical problems in Austria. To activate the cleaner production in the Korean regional industry, more systematic analysis on the examples and performances as well as additional studies to disseminate informations and the best practices are necessary.