The Flexure-based Microgap Rheometer (FMR)
Submitted to J. Rheol.
| Main Authors: | , , |
|---|---|
| Format: | Preprint |
| Language: | en_US |
| Published: |
2007
|
| Subjects: | |
| Online Access: | http://hdl.handle.net/1721.1/35772 |
| _version_ | 1810976113243979776 |
|---|---|
| author | Clasen, Christian Gearing, Brian P. McKinley, Gareth H. |
| author_facet | Clasen, Christian Gearing, Brian P. McKinley, Gareth H. |
| author_sort | Clasen, Christian |
| collection | MIT |
| description | Submitted to J. Rheol. |
| first_indexed | 2024-09-23T08:50:06Z |
| format | Preprint |
| id | mit-1721.1/35772 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T08:50:06Z |
| publishDate | 2007 |
| record_format | dspace |
| spelling | mit-1721.1/357722019-04-10T09:58:37Z The Flexure-based Microgap Rheometer (FMR) Clasen, Christian Gearing, Brian P. McKinley, Gareth H. Shear rheometry Yield stress Emulsion Microrheometry Microrheology Wall slip Mayonnaise Complex fluid Gap-dependent rheology Submitted to J. Rheol. We describe the design and construction of a new microrheometer designed to facilitate the viscometric study of complex fluids with very small sample volumes (1-10 μl)and gaps of micrometer dimensions. The Flexure-based Microgap Rheometer (FMR) is a shear-rate-controlled device capable of measuring the shear stress in a plane Couette configuration with directly-controlled gaps between 1 μm and 200 μm. White light interferometry and a three-point nanopositioning stage using piezo-stepping motors are used to control the parallelism of the upper and lower shearing surfaces which are constructed from glass optical flats. A compound flexure system is used to hold the fluid sample testing unit between a drive spring connected to an ‘inchworm’ motor and an independent sensor spring. Displacements in the sensing flexure are detected using an inductive proximity sensor. Ready optical access to the transparent shearing surfaces enables monitoring of the structural evolution in the gap with a long working-distance video-microscope. This configuration then allows us to determine the microgap-dependent flow behavior of complex fluids over 5 decades of shear rate. We demonstrate the capability of the FMR by characterizing the complex stress and gap dependent flow behavior of a typical microstructured food product (mayonnaise) over the range of gaps from 8 to 100 μm and stresses from 10 to 1500 Pa. We correlate the gap-dependent rheological response to the microstructure of the emulsion and changes induced in the material by prolonged shearing. Dupont MIT Alliance 2007-01-23T12:07:15Z 2007-01-23T12:07:15Z 2007-01-23T12:07:15Z Preprint http://hdl.handle.net/1721.1/35772 en_US 06-P-10 1137850 bytes application/pdf application/pdf |
| spellingShingle | Shear rheometry Yield stress Emulsion Microrheometry Microrheology Wall slip Mayonnaise Complex fluid Gap-dependent rheology Clasen, Christian Gearing, Brian P. McKinley, Gareth H. The Flexure-based Microgap Rheometer (FMR) |
| title | The Flexure-based Microgap Rheometer (FMR) |
| title_full | The Flexure-based Microgap Rheometer (FMR) |
| title_fullStr | The Flexure-based Microgap Rheometer (FMR) |
| title_full_unstemmed | The Flexure-based Microgap Rheometer (FMR) |
| title_short | The Flexure-based Microgap Rheometer (FMR) |
| title_sort | flexure based microgap rheometer fmr |
| topic | Shear rheometry Yield stress Emulsion Microrheometry Microrheology Wall slip Mayonnaise Complex fluid Gap-dependent rheology |
| url | http://hdl.handle.net/1721.1/35772 |
| work_keys_str_mv | AT clasenchristian theflexurebasedmicrogaprheometerfmr AT gearingbrianp theflexurebasedmicrogaprheometerfmr AT mckinleygarethh theflexurebasedmicrogaprheometerfmr AT clasenchristian flexurebasedmicrogaprheometerfmr AT gearingbrianp flexurebasedmicrogaprheometerfmr AT mckinleygarethh flexurebasedmicrogaprheometerfmr |