Pd-only 삼원촉매에서 Pd금속과 첨가금속과의 상호작용에 대한 연구

Pd-only 삼원촉매를 제조하여 여러 가지 물리화학적 촉매 특성화 방법을 이용하여 Pd 금속과 첨가금속인La과 Ce과의 상호관계를 연구하였다. 촉매의 활성점은 PdO이었고, La의 첨가로 인해 분산도는 감소하지만 내열성이 증가하고, Ce의 첨가로 인해 산소저장능력은 증대하지만, aging시 급격한 비표면적 감소와 더불어분산도가 감소하는 등 내열성에 문제가 있음을 알 수 있었다

The confocal Raman／UV-Vis／Fluorescence spectroscopyfor the combinatorial structural analysis of novelcatalysts, materials, and biomolecules

본 발명은 최소 300 ㎛ 크기의 미세시료가 10000개 이상으로 집적된 샘플 어레이의 분광학적 특성을 수 시간 내에 정확하게 평가할 수 있는 공초점 라만, 자외선/가시광 및 형광 분광기가 결합된 복합 시스템이다. 이를 위해 컴퓨터 프로그램에 의해 샘플의 좌표를 설정하여 스테이지를 자동으로 움직이게 하는 시스템과 더불어 광학시스템에 의해 빔 크기를 5㎛(라만시스템)에서 300㎛(자외선/가시광 및 형광 분광기)범위 내로 축소시켰다. 이에 따른 신호대 잡음비의 증가는 공초점 라만의 경우, 홀로그래픽 형 모노크로매터와 고감도의 광어레이 감지기를 사용함으로써 개선하였으며, 이를 통해 짧은 시간 내에 시료에 손상을 주지 않으면서 양질의 스펙트럼을 얻을 수 있는 특징을 가지고 있다. 따라서, 강유전체, 형광체를 포함한 무기소재, 고분자, 유기금속물질, 이온성 고체, 금속 합금에 이르기까지 다양한 용도의 소재 개발 및 바이오분자 검출 시 훨씬 효율적으로 구조분석을 수행할 수 있다

New Applications in Micro Chemical & Biological System

Nowadays, chemical engineering has faced fatal problems including the high cost of R&D, the environmental pollution, and high energy consumption. This is one of reasons that chemical industry is behind other industries such as electronic industry in competitive edge. To overcome these problems in chemical industry, process-on-chip is suggested as the counterproposal and combinatorial technology in discovering new materials has drawn an interest. Combinatorial technology is involved in high-throughput screening that can find novel high-performance materials and catalysts more quickly, less costly and more successfully by using rapid characterization of physical and chemical properties. This consists of four steps, (1) making optimal combinatorial samples, (2) synthesis of combinatorial chip or samples at one time, (3) primary screening for combinatorial chip or samples and (4) rapid characterization of physical and chemical properties of samples. Process-on-chip means the chemical factory built on the chip. Therefore, this combines the microfluidic reactor with analytic systems to carry out complex catalytic chemical reactions and the reaction of harmful materials that is impossible in conventional chemical process. This is the expansion of Lab-on-a-chip and can be applied into various fields from the DNA sensor to micro-fuel cell. In particular, it is challengeable in our country because process-on-chip is undeveloped field until now, and therefore it is expected that this technique can stimulate our chemical industry

Non-invasive temperature analysis of micro polymerase chain reaction chip by using liquid crystals and a micro-Raman spectroscopy

Liquid crystal (LC) thermometry and micro-Raman spectroscopy system were introduced for non-invasive temperature analysis of micro polymerase chain reaction (PCR) chip. The silicon-based micro PCR chip was fabricated by microelectromechanical system (MEMS) technology, and it consisted of a microchannel and a platinum thin film heater and sensor. The temperature of the chip was controlled by in situ temperature control system with the nonlinear feedback proportional-integral control scheme. As the results of the LC thermometry, the average microchannel temperature near annealing temperature (55 oC) was similar to the set temperature measured by the Pt film heater and it was lowered by nearly 1 oC than the control temperature near extension temperature (72 oC). The temperature deviation measured by the LC thermometry were less than 1.5 oC ± 0.5 oC and 3 oC ± 0.3 oC at the annealing and the extension temperature, respectively. The temperature deviation measured by the Raman thermometry varied from -1.0 oC to +0.1 oC at the annealing temperature