Colloidal crystals made of poly(N-isopropylacrylamide) microgel particles

Poly (N-isopropylacrylamide) microgel particles are found to form colloidal crystals similar to those occurring in typical hard-sphere colloids like poly(methylmethacrylate) beads. Samples made of particles with different cross-linker concentrations are investigated and their deswelling ratio is det...

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Bibliographic Details
Published in:Colloid and polymer science 2000-10, Vol.278 (10), p.972-978
Main Authors: HELLWEG, T, DEWHURST, C. D, BRÜCKNER, E, KRATZ, K, EIMER, W
Format: Article
Language:English
Subjects:
Applied sciences
Atoms & subatomic particles
Beads
Colloids
Crystal structure
Crystals
Dynamic tests
Dynamical systems
Dynamics
Exact sciences and technology
Microgels
Neutron scattering
Neutrons
Organic polymers
Photon correlation spectroscopy
Physicochemistry of polymers
Polyisopropyl acrylamide
Properties and characterization
Solution and gel properties
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Summary:Poly (N-isopropylacrylamide) microgel particles are found to form colloidal crystals similar to those occurring in typical hard-sphere colloids like poly(methylmethacrylate) beads. Samples made of particles with different cross-linker concentrations are investigated and their deswelling ratio is determined using dynamic light scattering. Small-angle neutron scattering data are also presented and analysed in terms of a face-centred-cubic crystal structure. The characteristic length, a, of the elementary cell is found to be 535±16 and 495±15nm for the two systems investigated. This leads to particle radii of 189±6 and 175±5nm, respectively. These values compare well to the radii determined using several different methods.[PUBLICATION ABSTRACT]
ISSN:0303-402X
1435-1536
DOI:10.1007/s003960000350