• Title/Summary/Keyword: The additive sols

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Fabrication of Thin Film Dielectric by Hybrid Sol (Hybrid Sol을 이용한 박막 유전체 제작)

  • Kim, Yong-Suk;Yoo, Won-Hee;Chang, Byeung-Gyu;Oh, Yong-Soo
    • Korean Journal of Materials Research
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    • v.17 no.4
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    • pp.185-191
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    • 2007
  • The purpose of this study is to evaluate the thin fihn dielectric made of hybrid sol, which consist of barium titanate powder, polymeric sol and other polymers. This sol will be used dielectric applied to small, thin electric passive components such as MLCC(Multi Layer Ceramic Condenser), resister, inductor. This sol is composed of mixed fine barium titanate powder and polymeric sol including Ba, Ti-precursor, solvent, chelating agent, chemical reaction catalyst, the additive sols to improve fired densification and temperature reliability. First at all, we mixed hybrid sol to be dispersed and be stabilized by ball milling for 24hrs. By spin coating method, we makes thin film dielectric on the convectional green sheet for MLCC. After heat treatments, we analyzes the structure morphology, physical, electrical properties and X5R Temperature properties.

Drainage and Shear Stability of Microparticle Retention Systems Based on Cationic Guar Gums and Colloidal Silicas (양이온성 구아검과 콜로이달 실리카를 이용한 마이크로파티클 보류시스템의 탈수 및 전단안정성)

  • Ham, Choong-Hyun;Lee, Hak-Lae
    • Journal of Korea Technical Association of The Pulp and Paper Industry
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    • v.40 no.2
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    • pp.1-7
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    • 2008
  • The trend of using more hardwood and recycled fibers, and closing more tightly of the paper mill white water system has resulted in build-up of fines as well as organic and inorganic contaminants in the white water. This changes in papermaking wet end requires developing chemical additive system that provides good fiber retention and drainage in closed white water system. In this study the effect of charge densities and chemical characteristics of microparticle systems consisted of cationic guar gums and anionic colloidal silica sols on drainage and retention have been examined. Results showed that higher charge density of cationic guar gum and anionic colloidal silica sol gave better retention and drainage. Particularly highly structured silica gave greater retention efficiency.