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한원식,홍태기,박기정,임성진,위광철,Han, Won-Sik,Hong, Tae-Kee,Park, Gi-Jung,Lim, Sung-Jin,Wi, Koang-Chul 한국문화재보존과학회 2008 보존과학회지 Vol.24 No.-
유구 이전의 안정성은 고분자 재료의 물리적 우수성뿐만 아니라 작업성과도 밀접한 관계가 있다. 이들 유구 이전 재료들은 토양에 함유된 수분 함량이나 낮은 온도와 같은 주위 환경의 영향이 없이 작업이 가능해야 하며, Epoxy최종 생성물로부터 Urethane 1차 생성물을 박리시키는 작업 공정 중의 안정성과 작업성도 요구된다. 그래서 본 논문에서는 우수한 물리적 특성을 갖는 저점도의 Epoxy polymer와 경화제 및 유구 이전을 위한 박리제에 대한 합성에 대하여 보고하고자 한다. 이 유구 이전 전용 저점도 Epoxy는 우수한 접착 강도와 자체 강도, 작업성 등의 물리적 안정성을 유지하고 있으며 특히, 박리제는 우레탄과 저점도의 Epoxy 간의 우수한 박리 안정성을 나타내고 있다. Stability of the moving historic sites have something to do with the degree of easiness of work as well as physical property of polymer product. These agents should be able to use without the effect of outer environments like water or low temperature and must have stability during progress of working the peel off Urethane pre-product from Epoxy surface. So, we synthesized low viscosity epoxy resin and hardener with best physical quality and separation media for the moving of historical sites. These products have very good tension strength, adhesion strength, low viscosity and various physical properties that the users want. Particularly, separation media products have good separation of Urethane pre-products surface and Epoxy final product surface.
5,5`-dithiobis(2-nitrobenzoic acid)를 Ionophore로 이용한 납 이온 선택성 Poly(aniline) 고체 접촉 전극
한원식 ( Won Sik Han ),홍태기 ( Tae Kee Hong ),이학주 ( Hak Joo Lee ),이영훈 ( Young Hoon Lee ) 한국환경분석학회 2012 환경분석과 독성보건 Vol.15 No.3
Lead (II) ion selective poly(aniline) solid contact electrode based on 5,5`-dithiobis (2-nitrobenzoic acid) ionophore as a two sulfur atoms containing sensing material is successfully developed. The electrode exhibits good linear response of 25.6 mV/decade (at 20±0.2oC, r 2=0.9995) within the concentration range of 1.0×10-1 ~1.0×10-6 M Pb (II) solution. The composition of this electrode was ionophore: polyvinylchloride: 2-nitrophenyloctyl ether: potassium tetrakis(4-chlorophenyl)borate=5.0: 20.0: 25.0: 4.0. When we consider the results of using different lipotropic additive or mixed additive as like oleic acid or potassiumtetrakis(4-chlorophenyl) borate+oleic acid, poly(aniline) solid contact electrode based on 5,5`-dithiobis (2-nitrobenzoic acid) ionophore with only one potassiumtetrakis(4-chlorophenyl)borate lipotropic additive had the best result in response characteristics. The electrode shows good selectivity for lead (II) ion in comparison with alkali, alkaline earth, transition and heavy metal ions. This electrode is suitable for use with aqueous solutions of pH 3.00~6.80 and their standard deviation in the measured emf differences was±1.01 mV at lead nitrate sample solution of 1.0×10-2 M and±1.75 mV at lead nitrate sample solution of 1.0×10-4 M. Their stabilization time was less than 850 s and response time was less than 15 s. This electrode was successfully applied as an indicator electrode in potentio-metric titration of 60.0 ml of 5.0×10-3 M Pb(NO3)2 solution against 1.0×10-2 M chromate solution. The amount of lead ions in solutions can be accurately determined from the resulting titration curves.
Phenylacetaldehyde thiosemicarbazone을 ionophore로 이용한 납 이온 선택성 고체 접촉 전극
한원식 ( Won Sik Han ),이정섭 ( Jung Sub Lee ),김현승 ( Hyun Seung Kim ),이영훈 ( Young Hoon Lee ),홍태기 ( Tae Kee Hong ) 한국환경분석학회 2013 환경분석과 독성보건 Vol.16 No.2
Lead (II) ion selective poly(aniline) solid contact electrode based on Phenylacetaldehyde thiosemicarbazone ionophore as a sulfur containing sensing material is successfully developed. The electrode exhibits good linear response of -30.1 mV / decade (at 20±0.2oC, r 2=0.998) within the concentration range of 1×10-1.0∼1×10-6.0 M Pb (II). The composition of this electrode was Ionophore : PVC : 2-nitrophenyloctylether : potassiumtetrakis(4-chlorophenyl)borate : Oleic acid = 5.0 : 20.0 : 25.0 : 4.0 : 5.0. When we consider the results of using different composition electrodes based on only one potassiumtetrakis(4-chlorophenyl)borate or Oleic acid liphophlic additive, poly(aniline) solid contact electrode based on Phenylacetaldehyde thiosemicarbazone ionophore with potassiumtetrakis(4-chlorophenyl)borate and Oleic acid liphophlic additive had the best result in response characteristics. The electrode shows good selectivity for lead (II) ion in comparison with alkali, alkaline earth, transition and heavy metal ions. This electrode is suitable for use with aqueous solutions of pH 5.0∼8.0 and their standard deviation in the measured emf differences was ± 2.84 mV at Tris buffered lead sample solution of 1.0×10-2.0 M and ± 2.82 mV at Tris buffered lead sample solution of 1.0×10-3 M. Their stabilization time was less than 650 s. and response time was less than 12 s.
1,2-bis(N,N`-benzylthioureido)benzene을 ionophore로 이용한 수은 이온 선택성 고체 접촉 전극
한원식 ( Won Sik Han ),오세림 ( Se Lim Oh ),이정란 ( Jung Ran Lee ),안성민 ( Sung Min Ahn ),홍태기 ( Tae Kee Hong ) 한국환경분석학회 2013 환경분석과 독성보건 Vol.16 No.1
Mercury (II) ion selective poly(aniline) solid contact electrode based on 1,2-bis(N,N`-benzylthioureido)benzene ionophore as two sulfurs containing sensing material is successfully developed. The electrode exhibits good linear response of 29.8 mV / decade (at 20±0.2℃, r2=0.9954) within the concentration range of 1×10-2.0 ∼1×10(-6.0) M Hg (II). The composition of this electrode was 2BTB 2.5: polyvinylchloride 16.5: 2-nitrophenyloctyl ether 30.5: potassiumtetrakis(4-chlorophenyl)borate 2.0. The electrode shows good selectivity for mercury (Ⅱ) ion in comparison with alkali, alkaline earth, transition and heavy metal ions. This electrode is suitable for use with aqueous solutions of pH 3.0∼7.0 and their standard deviation in the measured emf differences was ±1.21 mV at mercury nitrate sample solution of 1.0×(10-2) M and 1.0×10(-3) M, respectively. Their stabilization time was less than 72 s. and response time was less than 50 s.
한원식 ( Won Sik Han ),이혜림 ( Hye Rim Lee ),홍태기 ( Tae Kee Hong ) 한국환경분석학회 2010 환경분석과 독성보건 Vol.13 No.3
In this study, a portable instrument for measuring residual chlorine in environmental water samples was fabricated. This instrument was composed with a CPU (central processing unit), a photodiode, a LED, a data storing EEPROM, a key controller based on keyboard, several ICs, an LCD, and a power supply. It was tried to simplify the circuit structure and improve the anti-interference of the device through the collection and processing of photoelectrical signal, and the circuit control by using a CPU with an AD/DC converter. The LED with 525 nm wavelength was selected as a light source, to which ±5 V electric power was supplied. The calibration curve developed for the residual chlorine was found linear over the range of 0.2~2.0 mg/L. Their calibration sensitivities were 0.4146 and 0.4133 in KMnO4 and NaOCl standard solution, and their correlation coefficients were 0.9997 and 0.9994, respectively. Their relative error was only about 0.3%. When the instrument was applied to the water samples of 0.1 mg/L~1.8 mg/L range, it produced standard deviation of 0.003. The method detection limit was 9.95×10(-3) mg/L, when KMnO4 standard solution was used.