표면개질에 의한 인상흑연 분체의 분산특성 연구

김병곤; 최상근; 정헌생; 한상근; 이재장; Kim byoung gon; Choi sang keun; Chung hun seung; Han sang keun; Lee jae jang

Korean Journal of Materials Research, Vol.11, No.8, 679-684, August, 2001

Export Citation

표면개질에 의한 인상흑연 분체의 분산특성 연구

Dispersion Characteristics of Natural Crystalline Graphite Powders by Surface Modification

김병곤, 최상근, 정헌생, 한상근, 이재장¹

한국지질자원연구원 자원활용연구부
¹강원대학교 지구시스템공학과

Kim byoung gon, Choi sang keun, Chung hun seung, Han sang keun, and Lee jae jang¹

Korea Institute of Geoscience and Mineral Resource, Korea
¹Kangwon National University, Korea

초록

천연흑연은 단위구조가 탄소육각망평면이 평행하게 배열된 층상으로 전기전도도 및 윤활성이 우수하나 소수성이 매우 강하며, 표면화학적 목성이 거의 없기 때문에 다른 물질과 흡착이 쉽게 일어나지 않아 분산이 매우 어려운 물질이다. 따라서 본 연구에서는 제타전위를 이용하여 흑연에 ABDM을 흡착시켜 표면특성을 소수성에서 친수성으로 변화시키고 수중현탁액 중에서 흑연입자의 분산 메커니즘을 DLVO이론을 이용하여 설명하였다. 흑연의 제타전위가 22.5mV가 되도록 ABDM의 흡착량 (20mg/g) 및 조건 (PH 10에서 12시간 흡착)을 만족시키면 분산안정성 (T 1/2 ) 이 44.5시간인 고분산성 흑연 현탁액을 제조할 수 있다.

The surface of natural graphite has not only good electrical conductivities and lubrication properties but also has strong hydrophobicity. There are no functional groups and chemical properties on it. It is difficult to join with any other ions and to disperse in aqueous system. In order to increase dispersion ability throughout modification of surface property, it is necessary to let graphite have some function on its surface by the adsorption of surfactant molecules. In this study, using zeta potential adsorbed surfactant molecules(ABDM) on graphite surface and its surface Properties turn hydrophobic into hydrophilic. The dispersing mechanism of graphite particles in aqueous system has been explained using the DLVO theory, It is concluded that the high dispersable graphite suspension of which dispersing stability (T 1/2 ) is 44.5 hours at pH 10 and 22.5mV zeta potential can be produced.

Keywords:graphite;dispersion;adsorption;surface modification;zeta-potential

[References]

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[1] Ogino K, Abe M, 'Mixed Surfactant System' Surfactant Science series, Vol 46, Marcel Dekker, Inc. (1990) (1990)

[2] Kim BG, Choi SK, Chung HS, Lee JJ, The Korean Institute of Mineral and Energy Resources Engineers, 35, 453 (1998)

[3] 掘口博, '新界面活性劑' 世和, p. 452-504 (1994) (1994)

[4] Moriyama N, Colloid Polym. Sci., 254, 726 (1976)

[5] Song MG, 'The Dispersion Stability of Precipitated Calcium Carbonate Particles with Adsorbed APG Layers'. p. 31 (1997) (1997)

[6] Sato T, Shigeru K, J. Colloid Interface Sci., 152(2) (1992)

[7] Fowkes FM, Ind. Eng. Chem., 56, 40 (1964)

[8] Tatsuo S, Ruch R, 'Stabilization of colloidal dispersions by Polymer adsorption', Surfactant Science series, Vol. 9, Marcel Decker, Inc, p. 41-44 (1982) (1982)

[9] Hunter RJ, 'Zeta Potential in Colloid Science'. Academic Press Inc. LTD., London (1981) (1981)

[10] Domingue J, 'The Relationship of Wettability to Absorbency Cahn Instrument', (1989) (1989)