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RISS 인기검색어
- 검색키워드
- 저자 : Yasuko Y. Maruo (검색결과 2 건)
- 무료
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Katsuyuki Izumi,Masahiro Utiyama,Yasuko Y. Maruo 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
The authors are tackling the development of novel chemical sensor elements for detecting air pollutants. The base material of the sensor elements is porous glass, which has favorable features such as transparency and porosity. The sensor elements were prepared by impregnating reagents in a sheet of porous glass. The reagents were the Saltzman reagent for the detection of nitrogen dioxide, β-diketones for formaldehyde and potassium iodide for oxidant. The resultant elements were colorless. The first element was highly sensitive and changed to clear wine red upon exposures to nitrogen dioxide. The second element for formaldehyde developed yellow and was detectable as low as a few tens ppb for an exposure time of 8 h. The third element for oxidant also showed high sensitivity. Evaluation of the effects of various gases on these elements, which are indispensable in applying them to the real atmosphere, is underway except for the NO2 elements. The concept leading to the present study is briefly explained.
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Interferences of various gases on porous glass-based formaldehyde sensors
Satoru Tokumitsu,Katsuyuki Izumi,Masahiro Utiyama,Yasuko Y. Maruo 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
In order to examine the influences of various gases on sensor elements developed recently for the detection of gaseous formaldehyde, experiments were made in which the elements were exposed to air including one of the test gases. The elements are made of a porous glass sheet in which β-diketone (acetylacetone or 1-phenyl-1,3-butanedione) and ammonium ion are impregnated and both of the elements turn yellow from colorless upon exposures to formaldehyde. The experiments were made under a concentration of 2000ppm and a 50% relative humidity. As a result, aromatics such as benzene, toluene and ethylbenzene were found to cause no color changes. On the other hand, aldehydes and compounds having one or more C-C double bonds turned the two elements yellow. However the effects of these compounds are expected to be negligible under the realistic conditions, in view of the facts that the values of absorbance of light at peak wavelengths for these compounds were small and that the concentrations of the gases tested in this study were several orders of magnitude higher than those in the real atmosphere, even in the indoor environment.
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