06 colloids vdwaals

06 colloids vdwaals - Science of Colloidal Processing...

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Science of Colloidal Processing Objectives : nderstand fundamental physics and chemistry of Understand fundamental physics and chemistry of colloids and surfaces Apply these fundamentals to ceramic processing, powder aracterization and more characterization and more Contents: Van der Waals forces, Electric double layer forces, Zeta-Potential, Polymeric stabilization, Surface forces, Organic Aids, Rheology, High Temperature colloids 1
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Colloids Solid State Physics Polymers Viruses, DNA Molecules Proteins Atoms olecular mass Molecular mass Surface area olecular time 2 Molecular time scale Source: BASF
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Current forces that we know •W S •G • E efore before • Greek concept, Aristotle, Love and Hate • Alchemie – magnets loose power if rubbed with garlic 3 recover when rubbed with goat’s blood
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Masuda and Gotoh in Powder Technology Handbook, Eds. Gotoh, Masuda, Higashitani, p. 140 4
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History of Nanoparticles or Colloids Stone Age - Paintings in Lascaux caves, France Egypt - Pharaohs used stabilized colloidal pigments yp 1845 Francesco Selmi - Turbid pseudo-solutions of S, AgCl 1850 Michael Faraday - colloidal gold sols 1861 Thomas Graham coined “colloid” from Greek κολλα Colloid science: Connection of descriptive chemistry with theoretical physics 1945 DLVO theory by Derjaguin, Landau, Verweij, Overbeek 5
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olloid dimension layers Colloid dimension layers 1757 Benjamin Franklin - Oil on water calming the sea 1891 Agnes Pockels (without scientific) training eveloped a surface balance in kitchen sink and was developed a surface balance in kitchen sink and was the first one to report surface pressure vs. area isotherms 6
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Can we directly see the size of colloidal dimensions? Floaters in vitreous humor Entopic phenomena 100 μ m White blood cells - 5-8 μ m Red blood cells - 5 μ m 7 0.25 μ m per cone or rod in fovea
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Cochlea - outer hair cell cilia laments filaments 8
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The mechanotransduction process in hair cell cilia Ca 2+ Signal if moved about 0.1 nm inging after rock concert? 9 Ringing after rock concert?
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Steric Stabilization Electric Double Layer Stabilization Stern layer iffuse otential Diffuse layer Potential 10
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Van der Waals 11
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MOLECULAR FORCES In 1873 J.D. van der Waals responsible for modifying the ideal gas law (PV=nRT) to
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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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06 colloids vdwaals - Science of Colloidal Processing...

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