recent developments in materials science
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Recent Developments in Materials Science. NKS and the design of new materials. Materials Science for Dummies. Tinkertoy computer . Crystal Engineering. Node & spacer Appropriate symmetry Rigid spacer “Complete” coordination sphere “Self-correction” Thermodynamics Kinetics. - PowerPoint PPT PresentationTRANSCRIPT
Brian Moulton
Recent Developments in Materials Science
NKS and the design of new materials
Materials Science for Dummies
NKS 2007
NKS 2007
Tinkertoy computer
Crystal Engineering• Node & spacer
– Appropriate symmetry– Rigid spacer– “Complete” coordination
sphere
• “Self-correction”– Thermodynamics– Kinetics
NKS 2007
Crystal Engineering
NKS 2007
NKS 2007
NKS 2006
NKS 2007
NKS 2006
NKS 2007
NKS 2006
NKS 2007
NKS 2006
Amorphous Materials?• Node & spacer
– Specific geometries– Rigid spacer– “Complete” coordination
sphere
• “Self-correction”– Thermodynamics– Kinetics
NKS 2007
Amorphous Materials?
Mn12O12(CH3COO)16(H2O)4
NKS 2007
Ligand Exchange
O
OO
OO
O O
O
O
OO
O
OH
O
OO
O
NH2
O
OO
O
NOO
O
OO
O
OO OO
O O
OO
O O
Br
O O
OO
O O
OO
O O
OO
O
O
O
O
N
N
N
N
O
O O
O
O
OO
O
O
O
O
O
O
O
O
O
NKS 2007
Coordination Polymer Gels> 95% solvent, by mass
Chem. Commun., 2007, 2802.
NKS 2007
Coordination Polymer Gels
Chem. Commun., 2007, 2802.
NKS 2007
Sol-gel Structure
100X optical image
NKS 2007
Silica sol-gel
TEM imageNKS 2007
Xerogel (films)
NKS 2007
Xerogel (films)
NKS 2007
Aerogels
Langmuir surface area = 491 g/m2
NKS 2007
Aerogels
NKS 2007
Aerogels
NKS 2007
Relative Pressure (P/Po)
0.0 0.2 0.4 0.6 0.8 1.0
Vol
ume
(cc/
g)
0
200
400
600
800
1000
1200
1400
Log V = C + (D-3)[Log Log(Po/P)]
Aerogels
NKS 2007
Fractal Analysis of BL651a
log (log(Po/P))
-1.2 -1.0 -0.8 -0.6 -0.4 -0.2 0.0
log
volu
me
1.9
2.0
2.1
2.2
2.3
2.4
2.5
Plot 1Order 1
Curve 1:
Coefficients:b[0] 1.9299056529b[1] -0.4804483923r ² 0.9967341317
Fractal Dimension = 3 + b1 = 2.52
Porous Coordination Polymers
• Challenges*– Cooperative properties / composite materials– Thin layer compounds– Mesoscale compounds
*Kitagawa, et al., Angew. Chem. Int. Ed., 2004, 43, 2334-2375NKS 2007
Coordination Polymers Gels
• Composite materials• Xerogels: thin layer compounds • Aerogels: mesoporosity
Modular designProcessabilityMultiple synthetic approaches
NKS 2007
Acknowledgements• Shuangbing Han• Brian Luisi• Kevin Rowland
• Brown CAMR– SEM
• Indrek Kuloats– adsorption isotherms
• Kate Manley– microscopy
• Arkwright Incorporated of Coventry, R.I. (USA)– rheometry
NKS 2007