MICROSCOPIC DYNAMICS AT THE GLASS TRANSITION: INSIGHTS FROM SOFT COLLOIDAL DISPERSIONS

Journal Article · Thu Aug 28 00:00:00 EDT 2008 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2989070· OSTI ID:21152519

Romeo, G; Imperiali, L; Acierno, D ^[1]; Nieves, A F ^[2]; Weitz, D A ^[3]

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1. CR-INSTM Tecnologie di trasformazione di materiali polimerici e compositi, UDR di Napoli. Dipartimento di Ingegneria dei Materiali e della Produzione, Universita Federico II, P.le Piazzale V. Tecchio 80, 80125 Napoi (Italy)
2. School of Physics 837 State Street, Georgia institute of technology, Atlanta, GA (United States)
3. School of engineering and applied sciences, Harvard university, Cambridge, MA (United States)

We investigate the microscopic dynamics of compressible colloidal particles as function of concentration through dynamic light scattering and confocal microscopy experiments. In analogy with hard sphere (HS) colloidal systems, we find that the particles display liquid, supercooled liquid or glassy dynamics, depending on volume fraction. In the present case, however caging effects are observed for particle volume fractions higher than one, i.e. when the particles are compressed. We find that heterogeneous dynamics, described by a non Gaussian distribution of the displacements, play a major role in the supercooled liquid in proximity of the relaxation time.

• OSTI ID: 21152519
• Journal Information: AIP Conference Proceedings, Vol. 1042, Issue 1; Conference: 4. international conference on Times Of Polymers (TOP) and composites, Ischia (Italy), 21-24 Sep 2008; Other Information: DOI: 10.1063/1.2989070; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COLLOIDS
CONCENTRATION RATIO
GAUSS FUNCTION
GLASS
LIGHT SCATTERING
LIQUIDS
OPTICAL MICROSCOPY
PARTICLES
POLYMERIZATION
RELAXATION TIME
SURFACES