Direct Contact Angle Measurements on Polished Sections of Coal

References

• R. N. Wenzel “ Resistance of Solid Surfaces to Wetting by Water ”, Ind. Eng. Chem. , 28 , 288 – 294 ( 1936 ).
   Google Scholar
• A. B. D. Cassie and S. Baxter “Wettability of Porous Surfaces” , Trans. Faraday Soc. , 40 , 546 – 551 ( 1944 ).
   Google Scholar
• R. J. Good “A Thermodynamic Derivation of Wenzel's Modification of Young's Equation for Contact Angles; Together with a Theory of Hysteresis” , J. Am. Chem. Soc. , 74 , 5041 – 5042 ( 1952 ).
   Web of Science ®Google Scholar
• R. E. Johnson , Jr. and R. H. Dettre “Contact Angle Hysteresis I. Study of an Idealized Rough Surface” , Adv. Chem. Ser. , 43 , 112 – 135 ( 1964 ).
   Google Scholar
• R. E. Johnson , Jr. and R. H. Dettre “Contact Angle Hysteresis III. Study of an Idealized Heterogeneous Surface”, J. Phys. Chem. 68 , 1744–1750 (1964).
   Web of Science ®Google Scholar
• A. W. Neumann , D. Renzow , H. Reumuth , and I. E. Richter “Der Einfluss der Rauhigkeit auf die Benetzung” , Fortschr. Kolloide u. Polymere , 55 , 49 – 54 ( 1971 ).
   Google Scholar
• W. J. Herzberg , J. E. Marian , and T. Vermeulen “The Receding Contact Angle” , J. Colloid Interface Sci. , 33 , 164 – 171 ( 1970 ).
   Web of Science ®Google Scholar
• C. Huh and S. G. Mason “Effects of Surface Roughness on Wetting (Theoretical)” , J. Colloid Interface Sci. , 60 , 11 – 38 ( 1977 ).
   Web of Science ®Google Scholar
• J. F. Oliver , C. Huh , and S. G. Mason “An Experimental Study of Some Effects of Solid Surface Roughness on Wetting” , Colloids and Surfaces , 1 , 79 – 104 ( 1980 ).
   Google Scholar
• H. J. Busscher , A. W. J. van Pelt , P. de Boer , H. P. de Jong , and J. Arends “The Effect of Surface Roughening of Polymers on Measured Contact Angles of Liquids” , Colloids and Surfaces , 9 , 320 – 331 ( 1984 ).
   Google Scholar
• A. W. Neumann and R. J. Good “Thermodynamics of Contact Angles I. Heterogeneous Solid Surfaces” , J. Colloid Interface Sci. , 38 , 341 – 358 ( 1972 ).
   Web of Science ®Google Scholar
• J. D. Eick , R. J. Good , and A. W. Neumann “Thermodynamics of Contact Angles II. Rough Solid Surfaces” , J. Colloid Interface Sci. , 53 , 235 – 248 ( 1975 ).
   Web of Science ®Google Scholar
• A. W. Neumann “Contact Angles and Their Temperature Dependence Thermo-dynamic Status, Measurement, Interpretation and Application” , Adv. Colloid Interface Sci. , 4 , 105 – 191 ( 1974 ).
   Google Scholar
• A. W. Neumann , R. J. Good , C. J. Hope , and M. Sejpal “An Equation of State Approach to Determine Surface Tensions of Low Energy Solids from Contact Angles” , J. Colloid Interface Sci. , 49 , 291 – 303 ( 1974 ).
   Web of Science ®Google Scholar
• E. L. Green “Some Observations Upon Wetting Power” , J. Phys. Chem. , 33 , 921 – 935 ( 1929 ).
   Google Scholar
• E. E. Wark and I. W. Wark “The Physical Chemistry of Flotation HI. The Relationship Between Contact Angle and the Constitution of the Collector” , J. Phys. Chem. , 37 , 804 – 814 ( 1933 ).
   Google Scholar
• N. K. Adam and G. Jessop “Angles of Contact and Polarity of Solid Surfaces” , J. Chem. Soc. , 127 , 1863 – 1868 ( 1925 ).
   Google Scholar
• A. F. Taggart , T.C. Taylor , and C. R. Ince “Experiments with Flotation Reagents” , Trans. AIME (Am. Inst. Mining Met. Engrs.) , 87 , 285 – 368 ( 1930 ).
   Google Scholar
• O. C. Shepard “Experiments on the Cause of Bubble Attachment in Flotation” , Mining and Metallurgy , 17 , 339 ( 1936 ).
   Google Scholar
• G. L. Mack “The Determination of Contact Angles from Measurements of the Dimensions of Small Bubbles and Drops I. The Spheroidal Segment Method for Acute Angles” , J. Phys. Chem. , 40 , 159 – 167 ( 1936 ).
   Google Scholar
• F. E. Bartell and H. H. Zuidema “Wetting Characteristics of Solids of Low Surface Tension such as Talc, Waxes and Resins” , J. Am. Chem. Soc. , 58 , 1449 – 1454 ( 1936 ).
   Google Scholar
• G. A. Brady and A. W. Gauger “Properties of Coal Surfaces” , Ind. Eng. Chem. , 32 , 1599 – 1604 ( 1940 ).
   Google Scholar
• R. M. Horsley and H. G. Smith “Principles of Coal Flotation” , Fuel , 30 , 54 – 63 ( 1951 ).
   Google Scholar
• D. R. Brown “Coal Flotation” in “Froth Flotation” — 50th Anniversary Volume ( D. W. Fuerstenau , ed.), AIME , New York ( 1962 ), pp. 518 – 538 .
   Google Scholar
• F. F. Aplan “Coal Flotation” in “Flotation” ( M. C. Fuerstenau , ed.), Volume 2 , Gaudin A. M. Memorial Flotation Symposium , Rapid City , S.D. ( 1976 ), pp. 1235 – 1264 .
   Google Scholar
• S. C. Sun “Hypothesis for Different Floatabilities of Coals, Carbons and Hydrocarbon Minerals” , Trans. AIME , 199 , 67 – 75 ( 1954 ).
   Google Scholar
• R. L. Eissler K. E. van Holde “Wettability of Coal, Graphite and Naphthalene as Measured by Contact Angles” , Illinois State Geological Survey , Circular 333 ( 1962 ), pp. 1 – 20 .
   Google Scholar
• B. K. Parekh and F. F. Aplan “The Critical Surface Tension of Wetting of Coal” in “ Recent Developments in Separation Science” ( N. N. Li , ed.), Chemical Rubber Company , Cleveland , Ohio ( 1978 ), pp. 107 – 113 .
   Google Scholar
• T. Murata “Wettability of Coal Estimated from the Contact Angle”, Fuel , 60 , 744–746 (1981).
   Web of Science ®Google Scholar
• A. W. Neumann and R. J. Good “Techniques of Measuring Contact Angles” in ”Surface and Colloid Science” ( R. J. Good and R. R. Stromberg , eds.), Volume 11 , Plenum Press , New York ( 1979 ), pp. 31 – 91 .
   Google Scholar
• J. A. Gutierrez-Rodrigues , R. J. Purcell Jr. , and F. F. Aplan “Estimating the Hydrophobicity of Coal” , Colloids and Surfaces , 12 , 1 – 25 ( 1984 ).
   Google Scholar
• S. N. Omenyi , A. W. Neumann , C. J. van Oss “Attraction and Repulsion of Solid Particles by Solidification Fronts I. Thermodynamic Effects” , J. Appl. Phys. , 52 , 789 – 795 ( 1981 ).
   Web of Science ®Google Scholar
• M. J. Owen “ Mechanism of Fine-Coal Dewatering by Silicon Additives ” in “ Report for Electric Power Research Institute (EPRI) ”, CS-3548, Project 1030-20 , Dow Corning Co. , Auburn , Mich. ( 1984 ).
   Google Scholar
• M. R. Soulard , E. I. Vargha-Butler , H. A. Hamza , and A. W. Neumann “Wettability Measurements on Coal Particles by Means of the Solidification Front Technique” , Chem. Eng. Commun. , 21 , 329 – 344 ( 1983 ).
   Web of Science ®Google Scholar
• E. I. Vargha-Butler , M. R. Soulard , A. W. Neumann H. A. Hamza “Contact Angle Measurements on Coal Particles from Solidification Front Experiments” , CIM Bulletin , 74 , 54 – 58 ( 1981 ).
   Google Scholar
• E. I. Vargha-Butler , T. K. Zubovits , R. P. Smith , I. H. L. Tsim , H. A. Hamza , and A. W. Neumann “Effect of Aging on the Surface Characteristics of Coal Powders” , Colloids and Surfaces , 8 , 231 – 247 ( 1984 ).
   Google Scholar
• A. W. Neumann , E. I. Vargha-Butler , H. A. Hamza , and D. R. Absolom “Surface Properties of Coal Particles in Aqueous Media I. Solidification Front Measurements” , Colloids and Surfaces , 17 , 131 – 142 ( 1986 ).
   Google Scholar
• E. I. Vargha-Butler , T. K. Żubovits , H. A. Hamza , and A. W. Neumann “Surface Tension Effects in the Sedimentation of Polymer Particles in Various Liquid Mixtures” , J. Dispersion Science and Technology , 6 , 357 – 379 ( 1985 ).
   Web of Science ®Google Scholar
• E. I. Vargha-Butler , T. K. Zubovits , D. R. Absolom , H. A. Hamza , A. W. Neumann , “Surface Tension Effects in the Sedimentation of Coal Particles in Various Liquid Mixtures” , Chem. Eng. Commun. , 33 , 255 – 276 ( 1985 ).
   Web of Science ®Google Scholar
• E. I. Vargha-Butler , T. K. Zubovits , M. K. Weibel , D. R. Absolom , and A. W. Neumann “Surface Tension Effects in the Sedimentation of Coal Particles in n-Propanol/Water Mixtures” , Colloids and Surfaces , 15 , 233 – 238 ( 1985 ).
   Google Scholar
• D. R. Absolom , K. Eom , E. I. Vargha-Butler , H. A. Hamza , and A. W. Neumann ”Surface Properties of Coal Particles in Aqueous Media II. Adhesion of Coal Particles to Polymeric Substrates” , Colloids and Surfaces , 17 , 143 – 157 ( 1986 ).
   Google Scholar