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초음파 처리에 의한 수화제 현탁액의 분산 특성
Dispersion Characteristics of Wettable Powder Suspension by Ultrasonication

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  • 초록

    This study was carried out to settle the plugging problem which occurs frequently when agricultural wettable powder is used in pest control work using the crushing and the dispersing effects caused by irradiation of ultrasonic wave. Sonication was applied to the wettable powder suspension in a beaker for 30 seconds using a 28 kHz, 200 W PZT BLT, and the image of suspension before and after sonication was observed using a microscope and a SEM. The image of tow commercial wettable powder suspensions in water observed using an optics microscope showed that the agglomerated particles were irregularly distributed over the whole observed region when stirred mechanically, while showing more uniform distribution composed of comparatively single particles in the whole observed region after sonication. Concerning the above, the projected areas of particles in the four suspensions after sonication were decreased distinctively in the observed range of the microscope and the atomization of crystals was much developed. Over the measured range of 5.6∼4,157 ${\mu}$ m particle size, the overall projected area of particles was decreased to 58.3∼89.6% on the average after sonication. When the SEM images of sonicated wettable powder suspensions dissolved in water and CH $_3$ OH were compared to the suspensions before sonication, such phenomena as the atomization of particles, the expansion of voids between particles, the reduction and the decrease of agglomerated particle groups, and the progress of crack developments on the surface of flake-shaped particles were observed. It seemed possible that the plugging problem that occurs frequently in pest control machine when using wettable powder would be settled by the use of sonication.


  • 주제어

    Pest control .   Sonication .   Wettable powder .   Plugging problem.  

  • 참고문헌 (9)

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    4. Elution of ion exchange resins by use of ultrasonication , Feng,D.;C.Aldrich , Hydrometallurgy / v.55,pp.201-212,
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    6. Development of an ultrasonicated spray system for agricultrual liquid atomization , La,W.J.;E.S.Ju;J.D.Chung , Research Report, Ministry of Agriculture and Forestry / v.,pp.,
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    1. 1979 "무경운 파종기용 구절기의 견인특성에 관한 연구" 한국농업기계학회지 = Journal of the Korean Society for Agricultural Machinery 4 (1): 58~66    
    2. 1979 "임도정공정 미곡 도정실태" 한국농업기계학회지 = Journal of the Korean Society for Agricultural Machinery 4 (2): 1~8    
    3. 1980 "농가의 미곡저장실태" 한국농업기계학회지 = Journal of the Korean Society for Agricultural Machinery 5 (1): 33~42    
    4. 1981 "진동경운(振動耕耘)에 관(關)한 기초연구(基礎硏究) -견인력(牽引力), 토오크, 소요동력(所要動力) 및 모멘트에 관(關)한 모형실험(模型實驗)-" 한국농업기계학회지 = Journal of the Korean Society for Agricultural Machinery 6 (1): 1~14    
    5. 1991 "태양열저장(太陽熱貯藏)을 위한 평판형잠열축열장치(平板形潛熱蓄熱裝置)의 성능분석(性能分析)" 한국농업기계학회지 = Journal of the Korean Society for Agricultural Machinery 16 (3): 290~297    
    6. 1992 "주기적(週期的) 반복하중(反復荷重)을 받는 벼의 복소(複素)컴프라이언스" 한국농업기계학회지 = Journal of the Korean Society for Agricultural Machinery 17 (1): 79~90    
    7. 1996 "고점성 바이오유의 분무미립화를 위한 초음파 이용" 한국농업기계학회지 = Journal of the Korean Society for Agricultural Machinery 21 (4): 467~473    
    8. 1997 "수도작을 위한 적정 농기계 선정 전문가 시스템 개발(II) - 전문가 시스템 개발 -" 한국농업기계학회지 = Journal of the Korean Society for Agricultural Machinery 22 (3): 343~350    
    9. 1997 "미강유적용 소형 디젤기관의 타당성 검증 및 성능실험에 관한 연구" 한국액체미립화학회지 = Journal of ilass-korea 2 (3): 44~50    
    10. 1998 "PDPA에 의한 Pintle형 노즐의 미립화 특성실험 -식물유를 중심으로-" 에너지공학 = Journal of energy engineering 7 (1): 17~23    
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