Dual aging behaviour in a clay-polymer dispersion (Articolo in rivista)

Type
Label
  • Dual aging behaviour in a clay-polymer dispersion (Articolo in rivista) (literal)
Anno
  • 2014-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1039/c4sm00172a (literal)
Alternative label
  • Zulian L.; Augusto De Melo Marques F.; Emilitri E.; Ruocco G.; Ruzicka B. (2014)
    Dual aging behaviour in a clay-polymer dispersion
    in Soft matter (Online)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Zulian L.; Augusto De Melo Marques F.; Emilitri E.; Ruocco G.; Ruzicka B. (literal)
Pagina inizio
  • 4513 (literal)
Pagina fine
  • 4521 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
  • http://www.scopus.com/inward/record.url?eid=2-s2.0-84902106301&partnerID=q2rCbXpz (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 10 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 25 (literal)
Note
  • Scopu (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Dipartimento di Scienza Dei Materiali, Università Degli Studi Milano Bicocca, Via Roberto Cozzi, 53, 20125 Milano, Italy; Center for Life Nano Science, IIT at Sapienza, Istituto Italiano di Tecnologia, Viale Regina Elena 291, 00161 Roma, Italy; CNR-ISMAC, Via Edoardo Bassini 15, 20133 Milano, Italy; Dipartimento di Fisica, Sapienza Università di Roma, Piazzale Aldo Moro 5, I-00185, Italy; CNR-IPCF, I-00185 Rome, Italy (literal)
Titolo
  • Dual aging behaviour in a clay-polymer dispersion (literal)
Abstract
  • Clay-polymer compounds have recently attracted increasing attention due to their intriguing physical properties in colloidal science and their rheological non-trivial behaviour in technological applications. Aqueous solutions of Laponite clay spontaneously age from a liquid up to an arrested state of different nature (gel or glass) depending on the colloidal volume fraction and ionic strength. We have investigated, through dynamic light scattering, how the aging dynamics of Laponite dispersions at fixed clay concentration (Cw ¼ 2.0%) is modified by the addition of various amounts of poly(ethylene oxide) (PEO) (CPEO ¼ (0.05 O 0.50) %) at two different molecular weights (Mw ¼ 100 kg mol1 and Mw ¼ 200 kg mol1 ). A surprising and intriguing phenomenon has been observed: the existence of a critical polymer concentration C* PEO that discriminates between two different aging dynamics. With respect to pure Laponite systems the aging will be assisted (faster) or hindered (slower) for PEO concentrations respectively lower (CPEO < C* PEO) or higher (CPEO > C* PEO) than the critical concentration. In this way a control on the aging dynamics of PEO-Laponite systems is obtained. A possible explanation based on the balance of competitive mechanisms related to the progressive saturation of the clay surface by polymers is proposed. This study shows how a real control on the aging speed of the PEO-Laponite system is at hand and renders possible a real control of the complex interparticle interaction potential. (literal)
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