07 polymer stabilizationclass

07 polymer stabilizationclass - Class problems Class...

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lass problems Class problems alculate the minimum zeta- otential Calculate the minimum zeta potential needed for dispersion of 500 nm alumina articles at 0 001 M aCl particles at 0.001 M NaCl • Same as above but 0.001 MgCl 2 • Aqueous Si 3 N 4 processing • BaTiO 3 processing
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Surface Chemistry of BaTiO 3 heoretical phase stability iagram f the stem Ba i O * -1 0 Theoretical phase stability diagram of the system Ba-Ti-CO 2 -H 2 O -3 -2 log [C O 2 ] 45 BaTiO 3 BaCO 3 a 2+ [M] -6 -5 -4 - 4 , 5 -3,5 + Ba log B 2468 1 0 1 2 1 4 1 6 -7 B aOH pH Reactions at the solid-liquid interface BaTiO 3 (s) + H 2 O Ba 2+ (aq) + TiO 2 (s) + 2OH - + BaCO 3 (s) + H 3 O + Ba 2+ (aq) + HCO 3 - + H 2 O * Utech, B. ‘‘The Effect of Solution Chemistry on Barium Titanate Ceramics’’, Master Thesis from PennState University 1990.
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chemisorbed (grafted) physisorbed (adsorbed) (a) (c) (b) R , R g F L > R F (e) (f) (d)
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Steric stabilization – good solvent
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High adsorption ensity tial density Poten t low adsorption dens.
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This note was uploaded on 03/04/2010 for the course MSE 6448 taught by Professor Sigmund during the Spring '10 term at University of Florida.

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07 polymer stabilizationclass - Class problems Class...

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