RI Facade

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RI Facade
Nanotechnology
Michael Faraday (1830s)
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Nanotechnology Our Way
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Doing Things PORELY!
Materials Synthesis
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(No Transcript)
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Process Variables..

• Sol Preparation (Colloids)
• Coating Substrates
• Gelling Conditions
• Drying Procedures
• Sintering The Product

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Primary Chemistry
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Particles Vs Polymers

• Particles Favored when Hydrolysis is Greater
  than Condensation Rate!
• Most Metals Hydrolyze Rapidlyin H2O
• Si is One Exception Easier to Study
• Control Reaction Rates
• pH, T, M, H2O, L, I

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Primary Particle Size
100Å
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TEM of ZnO On Glass
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Quantum Confinement
dparticle lt dexiton
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100
Molecules on Surface !
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Particle Diameter
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MgO
Al2O3
Particle Flavors
NiO
TiO2
CdS
SiO2
MnO2
ZrO2
Fe2O3
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Double Dippers
Al2O3 - SiO2
ZrO2 - TiO2
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Nut Topping
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Stabile Suspension...
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Coat Me!
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Creating Composite Materials

• Films For Self-Cleaning Glass
• Photocatalytic Films for Treating Indoor Air
• Porous Proton Exhange Films for Ultracapacitors
  and Batteries
• Porous Electrodes for Capaciative Water Treatment
  Systems
• Corrosion Protecting Coatings on Steel

So Why Not Nanoporous Coatings on Aggregates!
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Coating Processes

• Dip Coating
• Spin Coating
• Imbibing
• Electrodepositing
• Spraying

http//www.sono-tek.com/widetrack/index.html
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Al2O3 Film on Glass
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Changing Properties of Aggregates
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Physical Properties

• Porosity
• Surface Area

A 6cm2
Coating
100 A
1 cm
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Chemical Properties

• Acid-Base
• Oxidation-Reduction
• Complexation

Clay Coatings Dirty Aggregates?
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Nanoporous Oxidevs Clay Coatings

• Smaller Size (3 vs 10,000nm!)
• Higher Surface Areas
• Controllable Acid-Base Chemistries
• Tailorable Porosities
• Provide Better Nucleation Sites

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Role of ITZ in Durability
Sulfates, Deicers, etc
Cracking pattern in normal strength concrete
(Illston J.M. and Domone P.L.J., 2001).
ITZ 30-50µm Distance between aggregates
75-100 µm ITZ composes 50 of the cement paste!
ITZ
75 and 100 µm
aggregate
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Higher Strenth Less Permability
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Particle-size and specific-surface-area scale
related to concrete materials (from Sobolev and
Ferrada 2005)
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Determine the Potential of Nanoporous Coatings to
Modify the ITZ
Sample Preparation
1. Coating of the stone cubes
by dip coating method
Stone Cube
Sol Suspension
The velocity of withdraw controls the coating
thickness.
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Determine the Potential of Nanoporous Coatings to
Modify the ITZ
Analysis
Shear Strength
Microstructure of ITZ
SEM imaging
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Results Shear Strength Trends
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Control
Aluminum
Silica
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Results Microstructure of ITZ
Control at 14 days
SiO2 at 14 days
Aluminum at 14 days
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In the Future, Our Coatings Will

• Improve Permeability, Tensile and Flexural
  Strength
• Mitigate Alkali Silica Reaction (ASR)
• Neutralize Other Harmful Extraneous Coatings
• Tailored Microstructure and Composition of the
  ITZ for Differing Environments.
• And.. Many Other Things!

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To Be Continued . . .
Paco Muñoz, Jessica Sanfillipo, Marc A.
Anderson Materials Science Program U. of
Wisconsin Madison www.engr.wisc.edu/groups/green