Spectroscopic studies of confined molecules under shear

Iwao Soga, Ali Dhinojwala, Yoon Kyoung Cho, Steve Granick

Research output: Contribution to journalConference article

Abstract

We introduce two new technique with the sensitivity to measure spectroscopic properties of confined molecules under shear. One concerns rheo-optics of fluids in micro-sized gaps. The experimental approach consists in applying periodic shear motion to fluid films confined between parallel plates separated by controllable film thickness from 0.1 to 100 micrometers. A key aspect is the concurrent ability to perform spectroscopic experiments (infrared or dielectric spectroscopy, or x-ray or neutron spectroscopy) of these fluids during flow. The second technique consists in flow field experiments of polymers adsorption and orientation. The experimental approach is to produce one-directional shear, at rates up to 10 4 sec -1, past adsorbed polymer layers of thickness less than 0.01 micrometers. The selective augmentation of vibrational modes oriented preferentially along the chain backbone is then used to probe chain orientation in the direction of flow in a laminar flow field.

Original languageEnglish (US)
Pages (from-to)89-97
Number of pages9
JournalMaterials Research Society Symposium - Proceedings
Volume464
StatePublished - Jan 1 1997
EventProceedings of the 1996 MRS Fall Meeting - Boston, MA, USA
Duration: Dec 4 1996Dec 5 1996

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ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Soga, I., Dhinojwala, A., Cho, Y. K., & Granick, S. (1997). Spectroscopic studies of confined molecules under shear. Materials Research Society Symposium - Proceedings, 464, 89-97.