Characterisation of monodisperse poly(N-isopropylacrylamide) microgel particles

T. Gilányi, Imre Varga, R. Mészáros, Genoveva Filipcsei, M. Zrínyi

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

Poly(N-isopropylacrylamide) microgel particles prepared by emulsion polymerisation in the presence of anionic surfactant have been investigated in different media in the swollen and collapsed state by static and dynamic light scattering measurements. The microgel latex was found to be highly monodisperse. The particle scattering function fits well to the theoretical function of a sphere. The hydrodynamic diameter of the particles is significantly higher than the diameter calculated from the measured radius of gyration for a sphere of constant density. The discrepancy was interpreted by a core/shell structure of the microgel particles. If the particles are in the collapsed state the two kinds of diameter coincide with each other, indicating that the microgel particles are compact spheres. In the globular state the gel still has 39% (w/w) water content. The particles bear a small surface charge resulting in a long-range electrostatic interaction between the particles in an aqueous environment. It was observed for the first time that at a sufficiently low ionic strength the aqueous microgel particle system undergoes an ordered/disordered phase transition.

Original languageEnglish
Pages (from-to)1973-1977
Number of pages5
JournalPhysical Chemistry Chemical Physics
Volume2
Issue number9
DOIs
Publication statusPublished - May 1 2000

Fingerprint

Anionic surfactants
Emulsion polymerization
Latex
Dynamic light scattering
Surface charge
Coulomb interactions
Ionic strength
Water content
Hydrodynamics
Phase transitions
Gels
Scattering
poly-N-isopropylacrylamide
scattering functions
gyration
latex
bears
moisture content
emulsions
light scattering

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Atomic and Molecular Physics, and Optics

Cite this

Characterisation of monodisperse poly(N-isopropylacrylamide) microgel particles. / Gilányi, T.; Varga, Imre; Mészáros, R.; Filipcsei, Genoveva; Zrínyi, M.

In: Physical Chemistry Chemical Physics, Vol. 2, No. 9, 01.05.2000, p. 1973-1977.

Research output: Contribution to journalArticle

@article{2f4f0328102c4afb84ec2c039ae3542b,
title = "Characterisation of monodisperse poly(N-isopropylacrylamide) microgel particles",
abstract = "Poly(N-isopropylacrylamide) microgel particles prepared by emulsion polymerisation in the presence of anionic surfactant have been investigated in different media in the swollen and collapsed state by static and dynamic light scattering measurements. The microgel latex was found to be highly monodisperse. The particle scattering function fits well to the theoretical function of a sphere. The hydrodynamic diameter of the particles is significantly higher than the diameter calculated from the measured radius of gyration for a sphere of constant density. The discrepancy was interpreted by a core/shell structure of the microgel particles. If the particles are in the collapsed state the two kinds of diameter coincide with each other, indicating that the microgel particles are compact spheres. In the globular state the gel still has 39{\%} (w/w) water content. The particles bear a small surface charge resulting in a long-range electrostatic interaction between the particles in an aqueous environment. It was observed for the first time that at a sufficiently low ionic strength the aqueous microgel particle system undergoes an ordered/disordered phase transition.",
author = "T. Gil{\'a}nyi and Imre Varga and R. M{\'e}sz{\'a}ros and Genoveva Filipcsei and M. Zr{\'i}nyi",
year = "2000",
month = "5",
day = "1",
doi = "10.1039/b000571l",
language = "English",
volume = "2",
pages = "1973--1977",
journal = "Physical Chemistry Chemical Physics",
issn = "1463-9076",
publisher = "Royal Society of Chemistry",
number = "9",

}

TY - JOUR

T1 - Characterisation of monodisperse poly(N-isopropylacrylamide) microgel particles

AU - Gilányi, T.

AU - Varga, Imre

AU - Mészáros, R.

AU - Filipcsei, Genoveva

AU - Zrínyi, M.

PY - 2000/5/1

Y1 - 2000/5/1

N2 - Poly(N-isopropylacrylamide) microgel particles prepared by emulsion polymerisation in the presence of anionic surfactant have been investigated in different media in the swollen and collapsed state by static and dynamic light scattering measurements. The microgel latex was found to be highly monodisperse. The particle scattering function fits well to the theoretical function of a sphere. The hydrodynamic diameter of the particles is significantly higher than the diameter calculated from the measured radius of gyration for a sphere of constant density. The discrepancy was interpreted by a core/shell structure of the microgel particles. If the particles are in the collapsed state the two kinds of diameter coincide with each other, indicating that the microgel particles are compact spheres. In the globular state the gel still has 39% (w/w) water content. The particles bear a small surface charge resulting in a long-range electrostatic interaction between the particles in an aqueous environment. It was observed for the first time that at a sufficiently low ionic strength the aqueous microgel particle system undergoes an ordered/disordered phase transition.

AB - Poly(N-isopropylacrylamide) microgel particles prepared by emulsion polymerisation in the presence of anionic surfactant have been investigated in different media in the swollen and collapsed state by static and dynamic light scattering measurements. The microgel latex was found to be highly monodisperse. The particle scattering function fits well to the theoretical function of a sphere. The hydrodynamic diameter of the particles is significantly higher than the diameter calculated from the measured radius of gyration for a sphere of constant density. The discrepancy was interpreted by a core/shell structure of the microgel particles. If the particles are in the collapsed state the two kinds of diameter coincide with each other, indicating that the microgel particles are compact spheres. In the globular state the gel still has 39% (w/w) water content. The particles bear a small surface charge resulting in a long-range electrostatic interaction between the particles in an aqueous environment. It was observed for the first time that at a sufficiently low ionic strength the aqueous microgel particle system undergoes an ordered/disordered phase transition.

UR - http://www.scopus.com/inward/record.url?scp=0034192437&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0034192437&partnerID=8YFLogxK

U2 - 10.1039/b000571l

DO - 10.1039/b000571l

M3 - Article

AN - SCOPUS:0034192437

VL - 2

SP - 1973

EP - 1977

JO - Physical Chemistry Chemical Physics

JF - Physical Chemistry Chemical Physics

SN - 1463-9076

IS - 9

ER -