Stochastic transient liquid-solid phase separation reveals multi-level dispersion states of particles in suspension

 |  Login

Show simple item record

dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en Gane, Patrick Dimic-Misic, Katarina Hummel, Michael Welker, Matthias Rentsch, Samuel 2019-09-20T11:08:30Z 2019-09-20T11:08:30Z 2019-01-01
dc.identifier.citation Gane , P , Dimic-Misic , K , Hummel , M , Welker , M & Rentsch , S 2019 , ' Stochastic transient liquid-solid phase separation reveals multi-level dispersion states of particles in suspension ' , Applied Rheology , vol. 29 , no. 1 , pp. 41-57 . en
dc.identifier.issn 1430-6395
dc.identifier.other PURE UUID: 2d888834-3d2e-4a7e-b38f-22b49ee18342
dc.identifier.other PURE ITEMURL:
dc.identifier.other PURE LINK:
dc.identifier.other PURE FILEURL:
dc.description.abstract Wall slip or, more usually, liquid-solid phase separation at the boundary wall when measuring the rheological properties of particulate suspensions is normally considered an undesirable source of error.However, exclusion of a structure consisting of multiple particulates at a planar boundary can, in turn, reveal the nature of that structure and the way it interacts with other elements in the dispersion. Using a system of surface-treated ground calcite particles, designed to control lyophilicity, dispersed, respectively, in two comparative liquids, hexadecane (dispersive surface tension component only) and linseed oil (both dispersive and polar surface tension components), the relative wettability of the particulate surface can be studied. The static state is viscoelastic, with the elastic component reflecting the network of interacting forces acting to structure the particles together and/or to trap liquid within the long-range particle-particle matrix. As strain is applied under plate-plate geometry, selected aggregate structures become size-excluded at the wall, leading to a loss of shear coupling with the bulk polydisperse suspension. At high strain, given optimal solids content, this results in a stochastic transition between two discrete stress data sets, i.e. that with full shear coupling and that with only partial coupling. Stress recovery is subsequently monitored as strain is step-wise reduced, and the progress toward loss of the stochastic transient phenomenon, together with its parallel change in magnitude, is used to describe the re-formation of primary agglomerates. Cessation of the phase separation indicates re-build of the close-to-static structure. Under certain conditions it is observed that the cessation may be accompanied by a secondary relaxation of state, indicating the build of a secondary but weaker structure, likened to the well-known dual-level flocculation in aqueous colloidal suspension. Rheo-optical observations using small angle light scattering illumination (SALS) are used to confirma structure model switching from static (uncoupled with shear) to rotating (fully coupled to the boundary-defined shear) and finally uniformly sheared. en
dc.format.extent 17
dc.format.extent 41-57
dc.format.mimetype application/pdf
dc.language.iso en en
dc.relation.ispartofseries Applied Rheology en
dc.relation.ispartofseries Volume 29, issue 1 en
dc.rights openAccess en
dc.subject.other Materials Science(all) en
dc.subject.other Condensed Matter Physics en
dc.subject.other 1182 Biochemistry, cell and molecular biology en
dc.subject.other biomaterials en
dc.title Stochastic transient liquid-solid phase separation reveals multi-level dispersion states of particles in suspension en
dc.type A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä fi
dc.description.version Peer reviewed en
dc.contributor.department Department of Bioproducts and Biosystems
dc.contributor.department Biopolymer Chemistry and Engineering
dc.contributor.department Omya AG
dc.subject.keyword Colloidal structure formation
dc.subject.keyword Dispersibility of particles in liquids
dc.subject.keyword Liquid-solid phase separation
dc.subject.keyword Particulate structures in suspension
dc.subject.keyword Rheo-optical structure analysis
dc.subject.keyword Rheology of suspensions
dc.subject.keyword Stochastic structures
dc.subject.keyword Surface wettability in dispersed systems
dc.subject.keyword Materials Science(all)
dc.subject.keyword Condensed Matter Physics
dc.subject.keyword 1182 Biochemistry, cell and molecular biology
dc.subject.keyword biomaterials
dc.identifier.urn URN:NBN:fi:aalto-201909205317
dc.identifier.doi 10.1515/ARH-2019-0005
dc.type.version publishedVersion

Files in this item

Files Size Format View

There are no open access files associated with this item.

This item appears in the following Collection(s)

Show simple item record

Search archive

Advanced Search

article-iconSubmit a publication