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Network formation in suspensions of colloids and liquid crystal: reversibility - memory effects

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Original languageEnglish
Title of host publicationMESOPHASES, POLYMERS, AND PARTICLES
EditorsG Lagaly, W Richtering
Place of PublicationBERLIN
PublisherSpringer-Verlag GmbH
Pages76-81
Number of pages6
ISBN (Print)3-540-22211-1
Publication statusPublished - 2004
Event41st Biennial Meeting of the Kolloid-Gesellschaft held in conjunction with the Bayreuth Polymer Symposium - Bayreuth
Duration: 28 Sep 200330 Sep 2003

Conference

Conference41st Biennial Meeting of the Kolloid-Gesellschaft held in conjunction with the Bayreuth Polymer Symposium
CityBayreuth
Period28/09/0330/09/03

Abstract

Suspensions of colloids, thermotropic low molecular weight liquid crystal, and small amounts of alkane are investigated by laser scanning confocal microscopy and calorimetry. While cooling the suspension through the isotropic-nematic phase transition the colloidal particles are expelled by the liquid crystal, causing the formation of a three-dimensional particle network. Upon reheating back into the isotropic phase the network may break up. However, taking the sample a number of times through the cooling/heating cycle leads to annealing of the network, accompanied by an increase of the loss modulus of the system by several orders of magnitude. Eventually it hardly breaks up, even after resting in the isotropic phase for several hours. Calorimetric studies reveal that in this case, the temperature dependent heat capacity of the system contains two peaks.

    Research areas

  • liquid crystals, colloids, network formation, confocal microscopy, calorimetry, CELLULAR SOLID BEHAVIOR, PHASE-TRANSITION, MIXTURES, SPHERES

ID: 1446136