Thermal aggregation properties of nanoparticles modified with temperature sensitive copolymers

Kristen L. Hamner, Mathew M Maye

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

In this paper, we describe the use of a temperature responsive polymer to reversibly assemble gold nanoparticles of various sizes. Temperature responsive, low critical solution temperature (LCST) pNIPAAm-co-pAAm polymers, with transition temperatures (TC) of 51 and 65 C, were synthesized with a thiol modification, and grafted to the surface of 11 and 51 nm gold nanoparticles (AuNPs). The thermal-responsive behavior of the polymer allowed for the reversible aggregation of the nanoparticles, where at T < T C the polymers were hydrophilic and extended between particles. In contrast, at T > TC, the polymer shell undergoes a hydrophilic to hydrophobic phase transition and collapses, decreasing interparticle distances between particles, allowing aggregation to occur. The AuNP morphology and polymer conjugation were probed by TEM, FTIR, and 1H NMR. The thermal response was probed by UV-vis and DLS. The structure of the assembled aggregates at T > TC was studied via in situ small-angle X-ray scattering, which revealed interparticle distances defined by polymer conformation.

Original languageEnglish (US)
Pages (from-to)15217-15223
Number of pages7
JournalLangmuir
Volume29
Issue number49
DOIs
StatePublished - Dec 10 2013

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copolymers
Polymers
Agglomeration
Copolymers
thermodynamic properties
Nanoparticles
nanoparticles
polymers
Gold
Temperature
temperature
gold
X ray scattering
conjugation
Sulfhydryl Compounds
thiols
Superconducting transition temperature
Conformations
Hot Temperature
Phase transitions

ASJC Scopus subject areas

  • Electrochemistry
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Materials Science(all)
  • Spectroscopy

Cite this

Thermal aggregation properties of nanoparticles modified with temperature sensitive copolymers. / Hamner, Kristen L.; Maye, Mathew M.

In: Langmuir, Vol. 29, No. 49, 10.12.2013, p. 15217-15223.

Research output: Contribution to journalArticle

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