EFFECT OF IONIC LIQUIDS ON AGGREGATION OF LATEX COLLOIDS
Transcript of EFFECT OF IONIC LIQUIDS ON AGGREGATION OF LATEX COLLOIDS
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EFFECT OF IONIC LIQUIDS ON AGGREGATION OF LATEX
COLLOIDS
ISTVÁN SZILÁGYI
LABORATORY OF COLLOID AND SURFACE CHEMISTRY
UNIVERSITY OF GENEVA
SWITZERLAND
WWW.COLLOID.CH
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CONCLUSIONS
AGGREGATION
SYSTEMS
MOTIVATION
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von Smoluchowski
Derjaguin, Landau, Verwey and Overbeek(DLVO)
PARTICLE AGGREGATION IN WATER
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stabilization of colloidsfoods, cosmetics, paints…
destabilization of colloidswastewater treatment,papermaking…
particles as catalystsstability during the run &removal by aggregation
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PARTICLE AGGREGATION IN ILS
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in aqueous electrolyte
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MOTIVATION
CONCLUSIONS
AGGREGATION
SYSTEMS
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PARTICLES SUSPENDED IN ILS
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ILs – room-temperature, water miscible ILs & their aqueous solutions
Particles – polystyrene latexes of 265 (SL) & 110 nm (AL) in radius
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PHYSICO-CHEMICAL DATA
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refractive index & viscosity – scattering vector & hydrodynamic radius in LS
REFRACTIVE INDEX DYNAMIC VISCOSITY
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MOTIVATION
CONCLUSIONS
AGGREGATION
SYSTEMS
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PARTICLE AGGREGATION RATES BY LS
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DYNAMIC LIGHT SCATTERING
aggregation rate: from SLShydrodynamic factor: fit
STATIC LIGHT SCATTERING
optical factor: RGD or T-matrixaggregation rate: least-squares fit
COMBINATION OF SLS & DLS
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PARTICLE AGGREGATION RATES BY DLS
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aggregation rate constant
Smoluchowski’s constant
normalized rate constant
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NORMALIZED AGGREGATION RATES
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STABILIZATION MECHANISMS
Interfacial IL LayersScience 322 (2008) 424 & JPCC 111 (2007) 5162
Electrical Double LayerPNAS 110 (2013) 9674 & JPCC 113 (2009) 16445
Stabilization EffectsLow IL Dose – Electrical Double LayersIntermediate IL Dose – Viscosity EffectHigh IL Dose – Interfacial Assembly
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MOTIVATION
CONCLUSIONS
AGGREGATION
SYSTEMS
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CONCLUSIONS
ABSOLUTE AGGREGATION RATES CAN BE DETERMINED
BY LIGHT SCATTERING IN IL-WATER MIXTURES
COLLOIDAL STABILITY IS INFLUENCED BY THE IL DOSE
DILUTED – DLVO-TYPE FORCES
INTERMEDIATE – VISCOUS STABILIZATION
PURE – SOLVATION STABILIZATION
INCREASING IL HYDROPHOBICITY LED TO LOWER CCCS
EXTENDED HOFMEISTER SERIES