Triggered detection and deposition: Toward the repair of microcracks

Vinita Yadav, Ryan A. Pavlick, Stephen M. Meckler, Ayusman Sen

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Developing methods to detect and repair damage in polymers is an active area of research. Many of the previously described methods suffer from the lack of long-term stability of the reagents, which are typically preincorporated into the polymer. Also, they tend to be specific to certain types of polymeric materials. In this paper, we describe a general method for detection and repair of cracks in polymers using a salt-triggered mechanism. The process consists of a polymer embedded with salt that works as a "reporter". Upon addition of a detection or healing agent, damaged areas in the polymer leach out salt, powering flows and activating the reagents in the fluid. Detection is possible with fluorescent quantum dots, which aggregate at the crack site. Repair is shown to occur through two different strategies. The first repair strategy involves high ionic strength triggered destabilization of oil-in-water emulsions, transporting polymerization agents, resulting in polymer deposition at the damage site. The second, more biocompatible strategy, involves using an enzyme, urease, and its catalytic hydrolysis of urea to deposit solid calcium carbonate in the crack. The solution of the detection or healing agent can be added "as needed" thereby overcoming the problem of reagent instability.

Original languageEnglish (US)
Pages (from-to)4647-4652
Number of pages6
JournalChemistry of Materials
Volume26
Issue number15
DOIs
StatePublished - Aug 12 2014

Fingerprint

Microcracks
Polymers
Repair
Salts
Cracks
Urease
Calcium Carbonate
Emulsion polymerization
Ionic strength
Calcium carbonate
Semiconductor quantum dots
Urea
Hydrolysis
Oils
Deposits
Enzymes
Fluids
Water

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

Cite this

Yadav, Vinita ; Pavlick, Ryan A. ; Meckler, Stephen M. ; Sen, Ayusman. / Triggered detection and deposition : Toward the repair of microcracks. In: Chemistry of Materials. 2014 ; Vol. 26, No. 15. pp. 4647-4652.
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Triggered detection and deposition : Toward the repair of microcracks. / Yadav, Vinita; Pavlick, Ryan A.; Meckler, Stephen M.; Sen, Ayusman.

In: Chemistry of Materials, Vol. 26, No. 15, 12.08.2014, p. 4647-4652.

Research output: Contribution to journalArticle

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