Soft matter @ LARMORlarmor.weblog.tudelft.nl/files/2012/10/SoftMatter_Voets.pdf · Using neutrons...
Transcript of Soft matter @ LARMORlarmor.weblog.tudelft.nl/files/2012/10/SoftMatter_Voets.pdf · Using neutrons...
Soft matter @ LARMOR
Dr. Ilja Voets
Scientific use of LARMOR
magnetism materials science
soft matter
Using neutrons to study soft matter
Good statistics
In situ, non-destructive experiments Access to:
o Structure • size • shape • molar mass
o Thermodynamic quantities • osmotic pressure
o Interactions o Dynamics
• local motion within macromolecules, polymer reptation
Soft matter @ LARMOR
Neutrons in soft matter research Colloids
Complex molecular systems
Food materials
Neutrons in soft matter research
Example 1: complex molecular systems
• intramolecular self-assembly of supramolecular motifs folds polymers into ‘single-chain polymer nanoparticles’ (SCPNs)
Functional foldable polymers
0.0 0.2 0.4 0.6 0.8 1.0
3
4
5
6
R G /
nm
φIPA / -ϕ
IPA
60 o C 50 o C 25 o C 20 o C 10 o C
PEGMA90-BTAMA10
Neutrons in soft matter research
Example 2: complex molecular systems
• multi-component assemblies of hydrocolloids
low cp / high cp
Lemmers SM 2011
Polymer micelles
PAA42-PAAm417 + PDMAEMA45-PGMA90
PAA42-PAAm417 + P2MVP42-PEO446
-4
-3
-2
-1
0
1
-2.125 -1.7 -1.275 -0.85
0
6
12
18
24
q [A−1]
Voets ACIE 2006
Neutrons in soft matter research
Example 3: complex molecular systems
• bio-hybrid polymer systems
Comellas-Aragones SM 2011
Bio-hybrid polymer systems
Comellas-Aragones SM 2011
What are your needs? (1) Sample environment
• sample size • sample temperature • pressure • controlled humidity • shear
(2) Access
• allocation procedure • amount of allocated time
(3) Support
• Technical support before, during, after the experiment • Data reduction, treatment, analysis
Soft matter @ LARMOR
Dr. Ilja Voets