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필터 팽창 액적 발생 장치를 이용한 미세한 silver 입상의 형상 및 크기
Morphology and Size of Fine Silver Particles Prepared by Using the Filter Expansion Aerosol Generator
HWAHAK KONGHAK, April 1996, 34(2), 183-187(5), NONE
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Abstract
필터 팽창 액적 발생 장치(FEAG)을 이용하여 silver nitrate 용액으로부터 다양한 조건에서 submicron 크기의 silver입자들을 제조하고 초음파 분무 열분해법에 의해서 제조된 입자들과 크기 및 형태를 비교하였다. 제조된 입자들의 XRD 및 TGA 분석 결과 질소와 공기 분위기에서 0.02초의 짧은 체류시간에도 불구하고 700℃ 이상의 반응 온도에서 순수한 결정의 silver 입자들이 제조되었다. 용액의 농도가 0.004에서 0.5mol/l까지 증가할 때 입자들의 평균 크기는 0.22에서 0.72㎛까지 증가하였다. 반응기 온도가 700℃ 이상에서 균일한 구형의 형태를 가지는 입자들의 제조되었고, 이보다 높은 반응기 온도에서는 크기 분포가 넓고 큰 입자들이 제조되었다. 0.5mol/l 용액으로부터 FEAG process에서 제조된 입자들은 같은 농도에서 초음파 분무 열분해법에 의해서 제조된 1.1㎛ 보다 미세한 0.72㎛의 평균 크기를 가졌다. 이것은 FEAG process에서 생성되는 액적의 크기가, 용액의 농도가 동일할 때, 약간 작기 때문이다.
Silver particles with submicron-size were prepared from silver nitrate solutions at various conditions by using the filter expansion aerosol generator(FEAG), and the size and morphology of particles were compared with those of particles prepared by ultrasonic spray pyrolysis. XRD and TGA analysis showed that pure silver particles were formed in 0.02 sec of residence time above 700℃ with air and nitrogen as carrier gas. As the precursor concentra-tion increased from 0.004 to 0.5mol/l, the mean particles size increased from 0.22 to 0.72㎛ for FEAG process. Above 700℃, silver particles with spherical and homogeneous morphology were produced, and larger size and broader size distribution particles were formed at higher reactor temperatures. The mean size of silver particles prepared from 0.5mol/l precursor solution by the FEAG process was 0.72㎛, which is smaller than 1.1㎛ particles formed by ultrasonic spray pyrolysis. This result is ascribed to the finer droplets size in the FEAG process.
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References
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