Synthesis of Polymer Grafted Silica Nanoparticles: Effect ...
Silica Nanoparticles: A building block in Art Conservation · 2020. 10. 6. · This project has...
Transcript of Silica Nanoparticles: A building block in Art Conservation · 2020. 10. 6. · This project has...
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Romain Bordes
Silica Nanoparticles:
A building block in Art Conservation
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NanoInnovation 2020
Acknowledgements
Chalmers 2
Chalmers
Krister Holmberg
Oleksandr Nechyporchuk
Krzysztof Kolman
Kinga Grenda
Elyse Canosa
NanoRestArt:
This project has received funding from the European Union’s
Horizon 2020 research and innovation programme under grant
agreement No 646063.
APACHE: This project has received funding from the European
Union’s Horizon 2020 research and innovation programme
under grant agreement No 814496
Michael PerssonPiero Baglioni’s group
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NanoInnovation 2020
Work of Art, Conservation Science and Nanosilica?
Chalmers 3
o Readily available
o Environmentally friendly
o Can be surface modified
Applied Surface Science, 2011, (257), 4250-4256
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NanoInnovation 2020 Chalmers 4
Two applications:
Strengthening of textiles Development of adsorbent for pollutants
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NanoInnovation 2020 Chalmers 5
Cotton degrades: damaged fibers
Reasons: oxidation and acidification
10 µm
Nechyporchuk et al., Journal of Cultural Heritage 2017, 28, 183-187.
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NanoInnovation 2020
Traditional lining
Chalmers 6
Gainsborough Products, LLC
o Natural protein-based glue (e.g.
rabbit glue)
o Synthetic adhesive (e.g Plextol
B500, D360 or BEVA 371)
o Thermoplastic…
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NanoInnovation 2020 Chalmers 7
Nanosilica is not working as such
+ silica2 µm
Iler, The chemistry of silica, Wiley-Blackwell, New York, 1979.
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NanoInnovation 2020 Chalmers 8
Neat cationic particles
- strong attachment
Neat anionic particles
last layer = cellulose
Carboxymethylcellulose (CMC)
Bare silica:
• 4 – 200 nm
• Negatively charged
• Alkaline
Silica + polyelectrolytesPolyethyleneimine
PEI
Surface modification
Key aspects:
- Inspired from paper industry
- High concentrations
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NanoInnovation 2020 Chalmers 9
+ silica
+ silica + PEI + CMC
Mechanical reinforcement
+ silica + PEI
10 µm
2 µm
2 µm
Kolman et al. Colloids Surf., A 2017, 532, 420-427.
Kolman et al. ACS Appl. Nano Mater. 2018, 1, 2036-2040
Palladino et al. Nanomaterials 2020, 10(5), 900.
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NanoInnovation 2020
Adsorbent development
J.Mater.Chem., 2011, 21, 15100–15120
Physical impregnation
• Easy to prepare
• Easy to up-scale
• The most practical for use on large scales
• Amine-containing polymers as polyethylenimine
(PEI) are often use due to low volatility and high
amine content
• The silica-PEI composites are more robust to a
variety of treatment conditions
Porous silica
support
Hollow structures provide
space for accommodation of
PEI, leading to high adsorption
capacities
Silica
NP
Silica-based
adsorbentWet Impregnation
with polyethylenimine (PEI)
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NanoInnovation 2020 Chalmers 11
One-pot wet impregnation
Polyethylenimine
(PEI)Solven
tMeOH
H2O
Polyethylenimine (PEI) Solvent
Silica-PEI
Final product
• FTIR• BET• SEM (selected
samples)• TGA
Characterization
BET – Brunauer-Emmett-Teller
SEM – Scanning Electron Microscope
TGA – Thermogravimetric Analysis
FTIR – Fourier Transform Infrared Spectroscopy
MeOH
H2O
Mw =800; Mn=600
Mw =25 000; Mn=10 000
Mw =1 300; Mn=1 200
Mw =60 000; Mn=750 000
▪ PEI loading: 5-65 wt%
Linear (L)
Branched (B)
SilicaLevasil CS30-236
Quartzene Z1
Silica byproduct
Levasil CS20-730
Levasil CS4-4110
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NanoInnovation 2020 Chalmers 12
Laboratory tests Field tests
Swedish National
Archives:
Nitrate/acetate negative
storage
Vasa Museum:
Display case copper corrosion
✓ Acetaldehyde
Pollutants:
✓ Acetic acid
✓ Formaldehyde
✓ Formic acid
✓ NO2
Analytical approach✓ Flow-bed reactor
• DRIFT-MS
• DSC-MS
✓ ODDY test
✓ Accelerated ageing
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NanoInnovation 2020 Chalmers 13
Conclusionso Nanosilica
o Can be adapted to various purposes
o Find inspiration in industrial application to tackle conservation
science problems
o Textile reinforcement
o CMC or PEI terminated – control surface distribution
o Provide a stiffer reinforcement
o Adsorbent development
o Versatile
o Surface modification