Introduction to Colloid and Surface Chemistry |
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Page 71
... spreading ) . 2. Spread as a thin film , which may show interference colours , until it is uniformly distributed over the surface as a ' duplex ' film . ( A duplex film is a film which is thick enough for the two interfaces , i.e. ...
... spreading ) . 2. Spread as a thin film , which may show interference colours , until it is uniformly distributed over the surface as a ' duplex ' film . ( A duplex film is a film which is thick enough for the two interfaces , i.e. ...
Page 72
... spread on water 72.8- ( 21.8 + 50-8 ) = +0.2 will just spread on pure water 72.8 — ( 27 · 5 + 8.5 ) = + 36-8 will spread against contamination - The final state of the interface is now just unfavourable for spreading . This causes the ...
... spread on water 72.8- ( 21.8 + 50-8 ) = +0.2 will just spread on pure water 72.8 — ( 27 · 5 + 8.5 ) = + 36-8 will spread against contamination - The final state of the interface is now just unfavourable for spreading . This causes the ...
Page 75
... spreading solvent evaporates away leaving a uniformly spread film . Benzene , although frequently used as a spreading solvent , is not entirely suitable owing to its slight solubility in water and long residence time at the interface ...
... spreading solvent evaporates away leaving a uniformly spread film . Benzene , although frequently used as a spreading solvent , is not entirely suitable owing to its slight solubility in water and long residence time at the interface ...
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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