Relationship between Surface Roughness and Contact Angle of Pyrite

doi:10.12972/ksmer.2014.51.3.349

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2014 Vol.51, Issue 3 Preview Page Next Page

Research Paper

Relationship between Surface Roughness and Contact Angle of Pyrite 황철석의 표면 거칠기와 접촉각의 관계: 정문영·허원·손승규
Moon Young Jung, Won Heo, Seung kyu Son

30 June 2014. pp. 349-357

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Abstract

There is approximately 5˚ difference in contact angle on the pyrite surface before and after 30 second interval measurement independent of roughness. Thus it is important to fix the measurement time to exclude the errors made from the contact time when contact angles are measured by sessile drop method. Though the samples, which were taken from the mineralogically homogeneous pyrite samples are evenly made, there are lots of differences in the contact angles according to the measurement positions. That was mostly due to the surface roughness of minerals. The contact angles of pyrite samples decreased slightly as the surface roughness increased. It is a typical phenomenon that it appears in hydrophilic surfaces depending on the Wenzel theory. Therefore it is necessary to lower the surface roughness to increase hydrophobicity of pyrite.

Keywords

Pyrite

Surface roughness

Wenzel theory

Contact angle

황철석 시편은 그의 표면 거칠기에 상관없이 측정시간이 30초 경과함에 따라 접촉각이 약 5°차이가 발생하였다. 따라서 sessile drop법으로 접촉각을 측정할 경우에는 접촉시간에 따른 오차를 배제하기 위해서 측정시간을 고정하는 것이 중요하다. 광물학적으로 균질한 황철석 시료를 취하여 평탄하게 제조한 시편인데도 불구하고 측정위치에 따라 접촉각에 많은 차이를 보이고 있었다. 이는 주로 광물 표면의 거칠기 때문에 나타나는 현상으로 황철석의 접촉각은 표면 거칠기가 증가함에 따라 약간 감소하였다. 이는 Wenzel이론에 따라 친수성 표면에서 나타나는 전형적인 현상이다. 따라서 황철석의 소수화도를 증가시키려면 그의 표면 거칠기를 낮추는 것이 필요하다.

키워드

황철석

표면 거칠기

Wenzel이론

접촉각

References

Adamson, A.W. and Gast, A.B., 1997, Physical Chemistry of Surfaces, sixth ed. John Wiley & Sons, New York.
Butt, H.-J., Graf, M. and Kappl, M., 2006, Physics and Chemistry of Interfaces, Wiley-VCH, Weinheim.
Chau, T.T., 2009, “A review of techniques for measurement of contact angles and their applicability on mineral surfaces,” Minerals engineering, Vol. 22, pp. 213-219.
Chau, T.T., Bruckard, W.J., Koh, P.T.L. and Nguyen, A.V., 2009, “A review of factors that affect contact angle and implications for flotation practice,” Advances in colloid and interface science, Vol. 150, pp. 106-115.
Jung, M.Y., Oh, S.H. and Moon, J.W., 2014, “Correlation between natural floatability and static contact angle of sulfide minerals,” J. Korean Soc. Miner. Energy Resour. Eng., Vol. 51, No. 2, pp. 240-247.
Meiron, T.S., Marmur, A. and Sam, S.I., 2004, “Contact angle measurement on rough surfaces,” J. of Colloid and Interface Science, Vol. 274, pp. 637-644.
Prestidge, C.A. and Jalston, J., 1996, “Contact angle studies of particulate sulphide minerals,” Mineral engineering, Vol. 9, pp. 85-102.
Rao, S.R., 2004, Surface Chemistry of Froth Flotation, 2nd ed., Kluwer Academic/Plenum Publishers, New York, pp. 351-384.
Shean, B.J. and Cilliers, J.J., 2011, “A review of froth flotation control,” International Journal of Mineral Processing, Vol. 100, pp. 57-71.
Shibuichi, S., Onda, T., Satoh, N. and Tsujii, K., 1996, “Super water-repellent surfaces resulting from fractal structure,” J. Phys. Chem., Vol. 100, pp. 19512-19517.
Sutherland, K.L. and Wark, I.W., 1955, Principles of flotation, Aust. IMM, Melbourne, p. 489.
Uelzen, Th. and Muller, J., 2003, “Wettability enhancement by rough surfaces generated by thin film technology,” Thin Solid Films, Vol. 434, pp. 311-315.
Ulusoy, U. and Yekeler, M., 2005, “Correlation of the surface roughness of some industrial minerals with their wettability parameter,” Chemical Engineering and processing, Vol. 44, pp. 557-565.
Ulusoy, U. and Yekeler, M., 2007, “Floatability of barite particles with different shape and roughness,” Indian Journal of Chemical Technology, Vol. 14, No. 6, pp. 616-625.
Wark, I.W. and Cox, A.B., 1934, Trans Am. Inst. Min. Metall. Pet. Eng. Inc., Vol. 112, pp. 189-244.
Wenzel, R.N., 1936, “Resistance of solid surfaces to wetting by water,” Industrial and engineering chemistry, Vol. 28, p. 988.
Wills, B.A., 1997, Mineral processing technology(6th), Butterworth-Heinemann, Oxford, p. 264.
Zografi, G. and Johnson, B.A., 1984, “Effect of surface roughness on advancing and receding contact angles,” Int. J. of Pharmaceutice, Vol. 22, pp. 159-176.

Information

Publisher :The Korean Society of Mineral and Energy Resources Engineers
Publisher(Ko) :한국자원공학회
Journal Title :Journal of the Korean Society of Mineral and Energy Resources Engineers
Journal Title(Ko) :한국자원공학회지
Volume : 51
No :3
Pages :349-357
DOI :https://doi.org/10.12972/ksmer.2014.51.3.349

[1] Adamson, A.W. and Gast, A.B., 1997, Physical Chemistry of Surfaces, sixth ed. John Wiley & Sons, New York.

[2] Butt, H.-J., Graf, M. and Kappl, M., 2006, Physics and Chemistry of Interfaces, Wiley-VCH, Weinheim.

[3] Chau, T.T., 2009, “A review of techniques for measurement of contact angles and their applicability on mineral surfaces,” Minerals engineering, Vol. 22, pp. 213-219.

[4] Chau, T.T., Bruckard, W.J., Koh, P.T.L. and Nguyen, A.V., 2009, “A review of factors that affect contact angle and implications for flotation practice,” Advances in colloid and interface science, Vol. 150, pp. 106-115.

[5] Jung, M.Y., Oh, S.H. and Moon, J.W., 2014, “Correlation between natural floatability and static contact angle of sulfide minerals,” J. Korean Soc. Miner. Energy Resour. Eng., Vol. 51, No. 2, pp. 240-247.

[6] Meiron, T.S., Marmur, A. and Sam, S.I., 2004, “Contact angle measurement on rough surfaces,” J. of Colloid and Interface Science, Vol. 274, pp. 637-644.

[7] Prestidge, C.A. and Jalston, J., 1996, “Contact angle studies of particulate sulphide minerals,” Mineral engineering, Vol. 9, pp. 85-102.

[8] Rao, S.R., 2004, Surface Chemistry of Froth Flotation, 2nd ed., Kluwer Academic/Plenum Publishers, New York, pp. 351-384.

[9] Shean, B.J. and Cilliers, J.J., 2011, “A review of froth flotation control,” International Journal of Mineral Processing, Vol. 100, pp. 57-71.

[10] Shibuichi, S., Onda, T., Satoh, N. and Tsujii, K., 1996, “Super water-repellent surfaces resulting from fractal structure,” J. Phys. Chem., Vol. 100, pp. 19512-19517.

[11] Sutherland, K.L. and Wark, I.W., 1955, Principles of flotation, Aust. IMM, Melbourne, p. 489.

[12] Uelzen, Th. and Muller, J., 2003, “Wettability enhancement by rough surfaces generated by thin film technology,” Thin Solid Films, Vol. 434, pp. 311-315.

[13] Ulusoy, U. and Yekeler, M., 2005, “Correlation of the surface roughness of some industrial minerals with their wettability parameter,” Chemical Engineering and processing, Vol. 44, pp. 557-565.

[14] Ulusoy, U. and Yekeler, M., 2007, “Floatability of barite particles with different shape and roughness,” Indian Journal of Chemical Technology, Vol. 14, No. 6, pp. 616-625.

[15] Wark, I.W. and Cox, A.B., 1934, Trans Am. Inst. Min. Metall. Pet. Eng. Inc., Vol. 112, pp. 189-244.

[16] Wenzel, R.N., 1936, “Resistance of solid surfaces to wetting by water,” Industrial and engineering chemistry, Vol. 28, p. 988.

[17] Wills, B.A., 1997, Mineral processing technology(6th), Butterworth-Heinemann, Oxford, p. 264.

[18] Zografi, G. and Johnson, B.A., 1984, “Effect of surface roughness on advancing and receding contact angles,” Int. J. of Pharmaceutice, Vol. 22, pp. 159-176.

Journal of the Korean Society of Mineral and Energy Resources Engineers ISSN:2288-0291(Print) 2288-2790(Online) 한국자원공학회지

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