Introduction to Colloid and Surface Chemistry |
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Page 91
... solid surface it may spread completely over the surface or , more likely , it may remain as a drop having a definite angle of contact with the solid surface ( Figure 5.1 ) . Air YS / A Solid YLIA Liquid YS / L Figure 5.1 Assuming that ...
... solid surface it may spread completely over the surface or , more likely , it may remain as a drop having a definite angle of contact with the solid surface ( Figure 5.1 ) . Air YS / A Solid YLIA Liquid YS / L Figure 5.1 Assuming that ...
Page 92
... solid - liquid attraction ; for example , water droplets will adhere to the underside of a paraffin wax surface ( ~ 110 ° ) . Some writers correlate 90 ° ◊ with wetting and > 90 ° with non - wetting in order to be in approximate ...
... solid - liquid attraction ; for example , water droplets will adhere to the underside of a paraffin wax surface ( ~ 110 ° ) . Some writers correlate 90 ° ◊ with wetting and > 90 ° with non - wetting in order to be in approximate ...
Page 94
... solid Figure 5.3 Surface roughness has the effect of making the contact angle further removed from 90 ° . If is less than 90 ° , the liquid will penetrate and fill up most of the hollows and pores in the solid and so form a plane surface ...
... solid Figure 5.3 Surface roughness has the effect of making the contact angle further removed from 90 ° . If is less than 90 ° , the liquid will penetrate and fill up most of the hollows and pores in the solid and so form a plane surface ...
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acid adsorbed adsorption adsorption isotherm approximately aqueous behaviour Brownian calculated cell charged surface chemisorption cm-¹ cm³ coefficient colloidal dispersions colloidal particles colloidal systems constant contact angle counter-ions curve cylinder decreases deflocculated deformation depends detergent diffusion dispersion medium distance droplets effect electrical double layer electrode electrolyte emulsifying equation equilibrium example Figure film flocculation flocculation concentration flow hydrocarbon chains hydrophilic increase interaction interface intrinsic viscosity ionic ions isotherms light scattered material measured membrane method micelles mixed film molecular weight molecules monolayer monomolecular motion O/W emulsions orientated osmotic pressure physical adsorption plate polymer polymerization pores porous potential energy potential gradient protein ratio relative repulsive sample sedimentation shear soaps sodium solid surface soluble solution solvation solvent spherical particles stability Stern layer stress surface tension surface-active surfactant temperature theory thermal thixotropic valency vapour pressure velocity viscoelastic viscometer volume W/O emulsions Waals wetting zero zeta potential