The dark side of microrheology: Non-optical techniques

Microrheology probes the mesoscale between bulk rheology, which provides an integral sample response, and nanorheology, which refers to a local response at a molecular confinement level. The term ‘microrheology’ is often used to refer to optical particle tracking methods that measure a local respons...

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Bibliographic Details
Published inCurrent opinion in colloid & interface science Vol. 19; no. 6; pp. 503 - 513
Main Authors Vleminckx, Giovanni, Clasen, Christian
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.12.2014
Subjects
Arrays
Bundles
Categories
Confinement
Microfluidics
Micrometers
Microrheology
Microrheometric
Nanostructure
Piezo vibrators
Rheology
Rheometers
Thin film rheology
Wall slip
Thin film rheology
Piezo vibrators
Microrheology
Microrheometric
Microfluidics
Wall slip
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Summary:Microrheology probes the mesoscale between bulk rheology, which provides an integral sample response, and nanorheology, which refers to a local response at a molecular confinement level. The term ‘microrheology’ is often used to refer to optical particle tracking methods that measure a local response of a sample. In contrast to this, non-optical microrheology techniques generally allow two different effects to be studied: actual confinement effects on the rheology and boundary effects such as slip. Investigating the mesoscale range has additional advantages such as the possibility to perform measurements with small sample volumes and at high shear rates. This review bundles the wide array of non-optical techniques into five categories: adaptations to a conventional rotational rheometer, sliding plate rheometry on a micrometer scale, microfluidics, piezo vibrators and radial channel flows. The concept of each set of techniques is described, together with their operational window and examples of recent studies. [Display omitted] •Microrheology probes the mesoscale between bulk- and nano-rheology.•Non-optical microrheology techniques allow to study actual confinement effects.•In-depth studies of boundary effects such as slip•Rheological measurements with small sample volumes and at high shear rates•Rotational and sliding rheometry, microfluidics, piezo vibrators, and radial channels
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ISSN:1359-0294
1879-0399
DOI:10.1016/j.cocis.2014.11.002