AC 임피던스 분석법을 이용한 K⁺ 이온선택성 PVC막 전극 특성

김용렬,안형환,강안수,Kim, Yong-Ryul,An, Hyung-Hwan,Kang, An-Soo 한국공업화학회 1998 공업화학 Vol.9 No.6

본 연구에서는 임피던스 스펙트럼 분석법을 사용하여 중성운반체로 dibenzo-18-crown-6 (D18Cr6)와 valinomycin (Val)을 이용하여 $K^+$이온선택성 PVC막 전극의 막과 용액계면에서의 임피던스 특성을 검토하였다. PVC막에 대한 운반체의 종류와 함량, 가소제, 막두께, 기본전해질의 혼입(doping)여부 및 이온의 농도변화 등을 교류임피던스 분석법을 이용하여 측정하였고, 그 결과를 전극특성과 비교 검토하고 PVC막 전극에서의 전달특성을 규명하였다. 교류 임피던스의 특성을 측정하여 중성운반체로 D18Cr6와 Val을 포함하고 있는 PVC막 전극의 등가회로는 막의 벌크저항과 전기이중층 용량을 포함하는 기하학적용량을 병렬로 하고, 용액저항과 직렬로 구성되는 임피던스의 등가회로임을 확인할 수 있었다. 그러나 저농도 및 저주파수 영역에서 약간의 전하전이저항과 Warburg저항이 나타나 중첩되는 것을 알 수 있었다. $K^+$이온선택성 전극에서 운반체로서 D18Cr6가 Val중 D18Cr6가 기존의 Val보다 전극특성 및 임피던스 특성이 좋았으며 특히 D18Cr6에 기본전해질로 potassium tetraphenylborate (TPB)를 첨가한 경우 이상적인 전극을 제조할 수 있었다. 운반체의 최적 함량은 D18Cr6와 Val의 경우 3.23wt%부근이었고, 가소제는 DBP가 가장 적절하였다. 막두께가 얇아질수록 임피던스 특성이 좋아졌으나, 막두께가 최적 막두께 이하로 얇아지면 전극특성이 나빠짐을 알 수 있었다. D18Cr6의 경우 $K^+$이온에 대한 혼합용액법에 의한 선택계수 서열은 다음과 같았다. $NH_4{^+}>Ca^{2+}>Mg^{2+}>Na^+$. With impedance spectrum measurements, impedance was studied in the interface between sample solutions for $K^+-ion$ selective PVC membrane electrode containing neutral carriers [dibenzo-18-crown-6 (D18Cr6) and valinomycine (Val)]. Response characteristics of electrode were examined by measuring AC impedance spectra that were resulted from the chemical structure and the content of carrier, variation of plasticizer, membrane thickness, doping of base electrolytes, and concentration variation of sample solution. Transport characteristics of PVC membrane electrode were also studied. It was found that the equivalent circuit for the membrane in $K^+$ solution could be expressed by a series combination of solution resistance and a parallel circuit consisting of the bulk resistance and geometric capacitance of the membrane system. But the charge transfer resistance and Warburg resistance were overlapped a little in the low concentration and low frequency ranges. The carrier, D18Cr6 was best for electrode and impedance characteristics, and ideal electrode characteristics were appeared especially in case of doping of the base electrolyte[potassium tetraphenylborate(TPB)]. The optimum carrier content was about 3.23 wt% in case of D18Cr6 and Val. DBP was best as a plasticizer. As membrane thickness decreased the impedance characteristics was improved, but electrode characteristics were lowered for membrane thickness below the optimum. In the case of D18Cr6, the selectivity coefficients by the mixed solution method for the $K^+$ ion were the order of $NH_4{^+}>Ca^{2+}>Mg^{2+}>Na^+$.

AC 임피던스 분석법을 이용한 K+ 이온선택성 PVC 막 전극 특성

김용렬,안형환,강안수 ( Yong Ryul Kim,Hyung Hwan An,An Soo Kang ) 한국공업화학회 1998 공업화학 Vol.9 No.6

포스터 발표 - 무기재료분과 / 전기화학분과 / 촉매분과 : 양이온 선택성 PVC 막 전극에서의 전극특성과 전달과정

김용렬,조경섭,강안수 ( Yong Ryul Kim,Kyoung Sub Cho,An Soo Kang ) 한국공업화학회 1997 한국공업화학회 연구논문 초록집 Vol.1990 No.3

중성운반체를 이용한 K⁺ 이온선택성 PVC막 전극

김용렬,조경섭,강안수,Kim, Yong-Ryul,Cho, Kyoung-Sub,Kang, An-Soo 한국공업화학회 1998 공업화학 Vol.9 No.5

본 연구에서는 전극전위 분석법을 사용하여 중성운반체로 dibenzo-18-crown-6(D18Cr6)와 valinomycin(Val)을 이용하여 $K^+$ 이온선택성 PVC막 전극의 막과 용액계면에서의 전극특성을 검토하였다. PVC막에서 감응물질(운반체)에 기본전해질의 혼입 (doping)여부, 감응물질의 종류와 함량, 가소제, 막두께 및 이온의 활동도변화에 따른 전극의 기울기, 선형응답범위 한계측정농도 및 방해이온에 따른 선택계수 등 전극특성을 검토하였다. 중성운반체로 D18Cr6, Val을 $K^+$ 이온으로 착체형성하여 사용하였고, 가소제로 dibutylphthalate(DBP), dioctyl sebacate(DOS) 및 dibutyl sebacate(DBS)를, 혼입제인 기본전해질로 potassium tetraphenylborate (KTPB) 및 용매로 THF를 지지체로 PVC를 이용하여 막을 제조하였다. 운반체의 최적 함량은 D18Cr6와 Val의 경우 3.23 wt %이었고, 가소제는 DBP가 가장 적절한 가소제이었다. 막두께에 대한 영향은 최적 막두께 이상에서는 막두께가 얇아질수록 전극특성이 좋아졌으나, 막두께가 이 이하로 얇아지면 운반체의 용출, 막의 강도 등이 작용하여 전극특성이 나빠짐을 알 수 있었다. D18Cr6의 경우 $K^+$ 이온에 대한 혼합용액법에 의한 선택계수 서열은 다음과 같았다: $NH_4{^+}>Ca^{2+}>Mg^{2+}>Na^+$. Electrode characteristics were studied in the interface between sample solutions and $K^+$ ion selective PVC membrane electrodes containing neutral carriers, dibenzo-18-crown-6(D18Cr6) and valinomycin(Val). The effect of doping of base electrolytes, the chemical structure and the content of carrier, variation of plasticizer, membrane thickness, and concentration variation of sample solution on the response characteristics of electrode such as the measured Nernstian slope, the detection limit, the linear response range, and potentiometric selectivity coefficients, were studied. In order to synthesize the membrane D18Cr6 and Val as neutral carriers were used, and complex between the carrier and $K^+$ ions were used as active materials. PVC membrane electrodes were made of plasticizers (DBP, DOS, and DBS), the base electrolyte[potassium tetraphenylborate(KTPB)], and solvent(THF). The chemical structure of carrier D18Cr6 was best for electrode and ideal electrode characteristics were appeared especially in case of doping of TPB. The optimum carrier content was about 3.23 wt % in case of D18Cr6 and Val. DBP was best as a plasticizer. As membrane thickness decreased the electrode characteristics was improved. But its characteristics were lowered below the optimum membrane thickness because of the elution of carrier, deterioration of membrane strength, etc. In the case of D18Cr6, the selectivity coefficients by the mixed solution method for the $K^+$ ion were in the order of $NH_4{^+}>Ca^{2+}>Mg^{2+}>Na^+$.

양이온 선택성 PVC 막 전극에서의 전극특성과 전달과정

김용렬,조경섭,강안수 ( Yong Ryul Kim,Kyoung Sub Cho,An Soo Kang ) 한국공업화학회 1997 한국공업화학회 연구논문 초록집 Vol.1997 No.0

중성운반체를 이용한 K+ 이온선택성 PVC 막 전극 ㅂ

김용렬,조경섭,강안수 ( Yong Ryul Kim,Kyoung Sub Cho,An Soo Kang ) 한국공업화학회 1998 공업화학 Vol.9 No.5

패각의 소성 특성 및 지속성 담지체 제조에 관한 연구

김용렬(Yong Ryul Kim),윤철훈(Cheol Hun Yoon) 한국유화학회 2008 한국응용과학기술학회지 Vol.26 No.2

Today, wastes of much quantity by fast industrialization and increase in population, population concentration etc. of modem society are increasing. Much oyster shell is breeding by character and conduct of oyster-industry for a long time among them. Oyster shell which breed by-product in oyster cultivating industry that specific gravity of domestic seashore cultivating industry is high is causing environmental problem by problem and so on hindrance, nature spectacle s waste and health hygiene on administration if it is pollution of district along the coast fishing ground, number of public ownership being stored in open area in seashore. About new material just-in-time through recycling and he of oyster shell by these problem wide that study. Go forward more and investigate special quality that is oyster shell s physical chemistry red in this research and oyster shell oyster shell which cause several environmental problems developing ability agricultural chemicals that use this encapsulating micro by ability carrier that is environmentally application possibility examine wish to.

겔의 수열합성법에 의한 다공성 구형 BaTiO3 미분체의 제조

김용렬 ( Yong Ryul Kim ) 한국유화학회 2005 한국응용과학기술학회지 Vol.22 No.4

음식물 쓰레기와 제지슬러지를 이용한 고체연료 제조

김용렬(Yong Ryul Kim),손민일(Min Il Son) 한국유화학회 2009 한국응용과학기술학회지 Vol.27 No.4

Dry Process(natural drying, hot-air drying, oil fry drying), optimized mixture ratio and the condition of carbonization was carried out in order to improve the product durability develop eco-friendly solid fuel mixing food waste and paper sludge. As a result of the experiment, oil fry drying process was the fastest method for drying food waste and paper sludge mixture that contains 80% water inside, and the optimized mixture ratio to minimize the generating concentration of chlorine gas against caloric value of mixture ratio was 7:3. Additionally proper temperature of product carbonization was about 200℃ and shown increasing product durability through the carbonization. Therefore, the pelletized solid fuel be shaped diameter around 0.5cm, length 2cm under which was pulverized and molded using 7:3 mixture of food waste, and paper sludge was the eco-friendly solid fuel possible to be industrialized which is consist of chlorine concentration of below 2.0wt% and the lowest caloric value of over 5,000kcal/kg. In conclusion, this developing manufacturing process of the solid fuel can be interpreted to contribute alternative energy development in accordance with low carbon and green growth era.

Eu(3)-Pyridine Dicarboxylic Acid 착물에 관한 전기화학적 거동 및 형광분광학적 연구

김용렬(Yong Ryul Kim),채원석(Won Seok Chae) 한국유화학회 2001 한국응용과학기술학회지 Vol.18 No.1

N/A Eu(Ⅲ) exhibits one electron-transfer reduction at E_1/2 = -0.564 V(vs. Ag/AgCl) and the hypersensitive peak at 615 ㎚ corresponding to ^5D_0→^7F_2 transition in 0.1 M LiClO_4 aqueous solution. Upon the addition of 2,6-pyridine dicarboxylic acid(PDA) to the Eu(Ⅲ) aqueous soultion, the reduction potential shifts negatively and the PDA, and the Eu(Ⅲ)-PDA complex emits great fluorescence than free-Eu(Ⅲ) ion at 615 ㎚. The results are interpreted in term of the electrochemical and spectrofluorometric studies.