Static and dynamic yield stresses of aerosil® 200 suspensionsin polypropylene glycol

• Type: Article in International Scientific Journal
• Date: 2010

Authors

Galindo Rosales, FJ (Author) FEUP; Rubio Hernandez, FJ (Author) Other

Journal

Title: Applied Rheology

Vol. 20

Pages: 22787.1-22787.10

ISSN: 1430-6395

Publisher: Vincentz

Indexing

ISI Web of Knowledge

Scopus - 36 Citations

Other information

Authenticus ID: P-008-PH2

DOI: 10.3933/applrheol-20-22787

Abstract (EN): Fumed silica suspensions in low molecular weight liquids are used in many photonic and microelectronic applications, playing its rheology a major role in the effectiveness of their usage. Particle-particle and particle-liquid medium interactions of suspensions of hydrophilic fumed silica in low molecular weight polar media, polypropylene glycol of 400 and 750 g/mol, concretely, have been already investigated. There, the affinity between polar solvent molecules and fumed silica particles prevents the formation of a 3D gel network. In this work it has been found that fumed silica can develop a flocculated suspension when it is dispersed in polypropylene glycol with a molecular weight of 2000 g/mol. Besides, it has been found that this suspension exhibits time dependent behaviour within its reversible shear thinning region, which is related to thixoelasticity. The experimental method, proposed theoretically by Cheng in 1986 to obtain the dynamic yield stress in thixotropic systems has been here extended successfully to a thixoelastic system. © Appl. Rheol.

Language: English

Type (Professor's evaluation): Scientific