emac 376 elena stachew
TRANSCRIPT
Mimicking nature: Creating lasting
adhesives for municipal
underground water pipeline systems through the study of blue mussels
Elena StachewDepartment of Macromolecular Science and
EngineeringEMAC 37604/24/12
www.asknature.org, 2008
Adhesion to a rough mineral surface in a wet, polar environment
Lifetime: commonly 2-3 years but if low predation levels exist, up to 18-20 years3
Must withstand: Cold temperatures Continual oscillatory stress High intensity stress
Essentially, a strong, tough and durable underwater adhesive that is not water-soluble
The life of a blue mussel from a materials perspective2
Key molecule: 3,4-dihydroxyphenylalanine (DOPA) Catechol functional group
Formed by post-translational hydroxylation of tryosine residues
Intermolecular crosslinking due to oxidation gives rise to solidification of adhesive
Metal mediation through formation of complexes with unoxidized catechol functional group gives rise to strong surface adhesion
6 MPa plaque adhesive strength Impressive with the type of environment
The chemistry of the plaque2
Functionalize linear or branched polymers with DOPA, DOPA peptides or other catechol functional groups2
Example: Poly(ethylene glycol) (PEG) based polymers Serve as inert and biocompatible macromolecular
supports Potential use as injectable medical adhesives for hard/soft
tissue repair and drug delivery
Messersmith Research Group at Northwestern University believes they will commercialize an anti-fouling medical implant coating in the next 3-5 years4
Studied Applications
Large pipeline systems utilize cast iron, ductile iron, steel and concrete5
Coated for corrosion resistance: asphalt (steel), enamel, cement (iron)
Problem: Leaks Causes: Age, joining methods, water conditions
(temperature, pressure, velocity), stress from traffic vibrations, frost loads, freezing soil6
Expensive and a hassle to maintain
Municipal underground water pipelines
Meets requirements: Water-insoluble adhesive Binds well to various surfaces (DuPont)2
Withstand oscillatory stress, cold temperatures
Reduces frequency of maintenance
Lower or balanced costs
Secondary benefit: prevent biofouling7
Possible solution: mussel-inspired adhesives
Choice of polymer that meets design requirements
Synthesis?
Cost
Lifetime
Concerns
1: http://www.asknature.org/strategy/1052eed7fd56c4933871c04b65b1cafb
2: http://www.annualreviews.org/doi/pdf/10.1146/annurev-matsci-062910-100429
3: http://www.bbc.co.uk/nature/blueplanet/factfiles/molluscs/mussel_bg.shtml
4: http://biomaterials.bme.northwestern.edu/mussel.asp
5: http://water.me.vccs.edu/concepts/material.html
6: http://www.nesc.wvu.edu/ndwc/pdf/ot/tb/tb_leakdetection.pdf
7: http://library.marist.edu/diglib/EnvSci/archives/alienspe/oneillcontrol/o'neill%20-%20control%20of%20zebra%20mussels%20in%20residential%20water%20systems.html
Sources