Skip to main content
Journal cover image

Interfacial phase transition of an environmentally responsive elastin biopolymer adsorbed on functionalized gold nanoparticles studied by colloidal surface plasmon resonance.

Publication ,  Journal Article
Nath, N; Chilkoti, A
Published in: Journal of the American Chemical Society
August 2001

The change in optical properties of colloidal gold upon aggregation has been used to develop an experimentally convenient colorimetric method to study the interfacial phase transition of an elastin-like polypeptide (ELP), a thermally responsive biopolymer. Gold nanoparticles, functionalized with a self-assembled monolayer (SAM) of mercaptoundecanoic acid onto which an ELP was adsorbed, exhibit a characteristic red color due to the surface plasmon resonance (SPR) of individual colloids. Raising the solution temperature from 10 degrees C to 40 degrees C thermally triggered the hydrophilic-to-hydrophobic phase transition of the adsorbed ELP resulting in formation of large aggregates due to interparticle hydrophobic interaction. Formation of large aggregates caused a change in color of the colloidal suspension from red to violet due to coupling of surface plasmons in aggregated colloids. The surface phase transition of the ELP was reversible, as seen from the reversible change in color upon cooling the suspension to 10 degrees C. The formation of colloidal aggregates due to the interfacial phase transition of adsorbed ELP was independently verified by dynamic light scattering of ELP-modified gold colloids as a function of temperature. Colloidal SPR provides a simple and convenient colorimetric method to study the influence of the solution environment, interfacial properties, and grafting method on the transition properties of ELPs and other environmentally responsive polymers at the solid-water interface.

Duke Scholars

Altmetric Attention Stats
Dimensions Citation Stats

Published In

Journal of the American Chemical Society

DOI

EISSN

1520-5126

ISSN

0002-7863

Publication Date

August 2001

Volume

123

Issue

34

Start / End Page

8197 / 8202

Related Subject Headings

  • Water
  • Surface Properties
  • Surface Plasmon Resonance
  • Spectrophotometry, Ultraviolet
  • Solutions
  • Particle Size
  • Kinetics
  • Gold Colloid
  • General Chemistry
  • Fatty Acids
 

Citation

APA
Chicago
ICMJE
MLA
NLM
Nath, N., & Chilkoti, A. (2001). Interfacial phase transition of an environmentally responsive elastin biopolymer adsorbed on functionalized gold nanoparticles studied by colloidal surface plasmon resonance. Journal of the American Chemical Society, 123(34), 8197–8202. https://doi.org/10.1021/ja015585r
Nath, N., and A. Chilkoti. “Interfacial phase transition of an environmentally responsive elastin biopolymer adsorbed on functionalized gold nanoparticles studied by colloidal surface plasmon resonance.Journal of the American Chemical Society 123, no. 34 (August 2001): 8197–8202. https://doi.org/10.1021/ja015585r.
Nath, N., and A. Chilkoti. “Interfacial phase transition of an environmentally responsive elastin biopolymer adsorbed on functionalized gold nanoparticles studied by colloidal surface plasmon resonance.Journal of the American Chemical Society, vol. 123, no. 34, Aug. 2001, pp. 8197–202. Epmc, doi:10.1021/ja015585r.
Journal cover image

Published In

Journal of the American Chemical Society

DOI

EISSN

1520-5126

ISSN

0002-7863

Publication Date

August 2001

Volume

123

Issue

34

Start / End Page

8197 / 8202

Related Subject Headings

  • Water
  • Surface Properties
  • Surface Plasmon Resonance
  • Spectrophotometry, Ultraviolet
  • Solutions
  • Particle Size
  • Kinetics
  • Gold Colloid
  • General Chemistry
  • Fatty Acids