Nanocapsules for self-healing materials

B. J. Blaiszik; N. R. Sottos; S. R. White

doi:10.1016/j.compscitech.2007.07.021

Nanocapsules for self-healing materials

B. J. Blaiszik, N. R. Sottos, S. R. White

Research output: Contribution to journal › Article › peer-review

Abstract

We report an in situ encapsulation method demonstrating over an order of magnitude size reduction for the preparation of urea-formaldehyde (UF) capsules filled with a healing agent, dicyclopentadiene (DCPD). Capsules with diameters as small as 220 nm are achieved using sonication techniques and an ultrahydrophobe to stabilize the DCPD droplets. The capsules possess a uniform UF shell wall (77 nm average thickness) and display good thermal stability. By controlling the ζ-potential, the capsules are uniformly dispersed in an epoxy matrix and shown to cleave rather than debond upon fracture of the matrix. Mechanical properties of the epoxy/capsule composite, including mode-I fracture toughness, elastic modulus, and ultimate tensile strength are measured and compared to previous data for larger capsules (ca. 180 μm).

Original language	English (US)
Pages (from-to)	978-986
Number of pages	9
Journal	Composites Science and Technology
Volume	68
Issue number	3-4
DOIs	https://doi.org/10.1016/j.compscitech.2007.07.021
State	Published - Mar 2008

Keywords

A. Nanostructures
A. Polymer-matrix composites
A. Smart materials
B. Mechanical properties
Self-healing materials

ASJC Scopus subject areas

General Engineering
Ceramics and Composites

Online availability

10.1016/j.compscitech.2007.07.021

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title = "Nanocapsules for self-healing materials",

abstract = "We report an in situ encapsulation method demonstrating over an order of magnitude size reduction for the preparation of urea-formaldehyde (UF) capsules filled with a healing agent, dicyclopentadiene (DCPD). Capsules with diameters as small as 220 nm are achieved using sonication techniques and an ultrahydrophobe to stabilize the DCPD droplets. The capsules possess a uniform UF shell wall (77 nm average thickness) and display good thermal stability. By controlling the ζ-potential, the capsules are uniformly dispersed in an epoxy matrix and shown to cleave rather than debond upon fracture of the matrix. Mechanical properties of the epoxy/capsule composite, including mode-I fracture toughness, elastic modulus, and ultimate tensile strength are measured and compared to previous data for larger capsules (ca. 180 μm).",

keywords = "A. Nanostructures, A. Polymer-matrix composites, A. Smart materials, B. Mechanical properties, Self-healing materials",

author = "Blaiszik, {B. J.} and Sottos, {N. R.} and White, {S. R.}",

note = "Funding Information: The authors would like to acknowledge the funding provided by the National Science Foundation through NanoCEMMS (NSF DMI 03-28162 COOP) and the Air Force Office of Scientific Research (FA9550-06-1-0553). The authors would also like to acknowledge Prof. Paul Braun and Aaron Jackson for providing the TEM images of the nanocapsules as well as the work of the autonomic materials group, and in particular Nathan Bosscher for preliminary work, Byron McCaughey, Joe Rule, Gerald Wilson, Michael Keller, David McIlroy, Alyssa Rzesutko, and Jessica Berry. Copyright: Copyright 2008 Elsevier B.V., All rights reserved.",

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doi = "10.1016/j.compscitech.2007.07.021",

language = "English (US)",

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AU - Blaiszik, B. J.

AU - Sottos, N. R.

AU - White, S. R.

N1 - Funding Information: The authors would like to acknowledge the funding provided by the National Science Foundation through NanoCEMMS (NSF DMI 03-28162 COOP) and the Air Force Office of Scientific Research (FA9550-06-1-0553). The authors would also like to acknowledge Prof. Paul Braun and Aaron Jackson for providing the TEM images of the nanocapsules as well as the work of the autonomic materials group, and in particular Nathan Bosscher for preliminary work, Byron McCaughey, Joe Rule, Gerald Wilson, Michael Keller, David McIlroy, Alyssa Rzesutko, and Jessica Berry. Copyright: Copyright 2008 Elsevier B.V., All rights reserved.

PY - 2008/3

Y1 - 2008/3

N2 - We report an in situ encapsulation method demonstrating over an order of magnitude size reduction for the preparation of urea-formaldehyde (UF) capsules filled with a healing agent, dicyclopentadiene (DCPD). Capsules with diameters as small as 220 nm are achieved using sonication techniques and an ultrahydrophobe to stabilize the DCPD droplets. The capsules possess a uniform UF shell wall (77 nm average thickness) and display good thermal stability. By controlling the ζ-potential, the capsules are uniformly dispersed in an epoxy matrix and shown to cleave rather than debond upon fracture of the matrix. Mechanical properties of the epoxy/capsule composite, including mode-I fracture toughness, elastic modulus, and ultimate tensile strength are measured and compared to previous data for larger capsules (ca. 180 μm).

AB - We report an in situ encapsulation method demonstrating over an order of magnitude size reduction for the preparation of urea-formaldehyde (UF) capsules filled with a healing agent, dicyclopentadiene (DCPD). Capsules with diameters as small as 220 nm are achieved using sonication techniques and an ultrahydrophobe to stabilize the DCPD droplets. The capsules possess a uniform UF shell wall (77 nm average thickness) and display good thermal stability. By controlling the ζ-potential, the capsules are uniformly dispersed in an epoxy matrix and shown to cleave rather than debond upon fracture of the matrix. Mechanical properties of the epoxy/capsule composite, including mode-I fracture toughness, elastic modulus, and ultimate tensile strength are measured and compared to previous data for larger capsules (ca. 180 μm).

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KW - A. Polymer-matrix composites

KW - A. Smart materials

KW - B. Mechanical properties

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Nanocapsules for self-healing materials

Abstract

Keywords

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