Skip to main content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.


The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

The rheo-Raman microscope: Simultaneous chemical, conformational, mechanical, and microstructural measures of soft materials



Anthony P. Kotula, Matthew Meyer, Francesca De Vito, Jan Plog, Angela R. Hight Walker, Kalman D. Migler


We describe the design and demonstrate performance of an instrument capable of simultaneous Raman spectroscopy, rheology, and optical microscopy of materials. The instrument couples a Raman microscope with a rotational rheometer through an optically transparent base to collect Raman scattering at a user-defined radial position within the shearing geometry. We demonstrate the instrument performance in two material that show thermal transitions. First, in a cosmetic emulsion, we perform steady state viscometry, Raman scattering, and polarized imaging during a melting transition. Second, in a high density polyethylene, we perform small amplitude oscillatory shear modulus measurements along with Raman and imaging during crystallization. The instrument is advantageous in situations where rheology is closely coupled to either chemical or conformational changes in molecular structure as in crystallization, melting, gelation, or curing.
Review of Scientific Instruments
Created October 4, 2016, Updated November 10, 2018