Professor Indei's research interests are focused on rheology of polymers and diffusion of microparticles in viscoelastic soft materials. Currently, his research focuses on the following areas:
Microbead rheology, or microrheology, is a relatively new technique to measure rheological properties of soft materials by tracking the motion of micron-sized tracer particles embedded in it by using some optical technique.
In passive microrheology, rheological properties are estimated by using the generalized Stokes-Einstein relation (GSER) that relates the particle's displacement in the medium and the mechanical quantities of the host medium (such as the dynamic modulus).
Recently, his research group generalized the GSER to include particle and medium inertia, so that rheological properties of the host medium can be estimated even at higher frequencies where inertia is not negligible.
Rheology and gelation of associating polymers
Associating polymers are polymers that contain associative groups, or stickers, along the backbone.
Stickers tend to gather in solvent to form a physically cross linked network via the temporal junction of stickers that has a limiting lifetime.
The gelation gives the solution useful rheological features from industrial point of view in paints, inks, cosmetics, foods and so on, and also these features are very interesting from scientific point of view.
He is interested in both telechelic polymer (that contains stickers only at ends of the polymer) and multisticker polymers (that have a number of stickers along the polymer).
Indei T., J. D. Schieber, and A. Cordoba, "Competing Effects of Particle and Medium Inertia on Particle Diffusion in Viscoelastic Materials, and Their Ramifications for Passive Microrheology", Physical Review E, 85, 041504, 2012.
Indei T., J. D. Schieber, A. Cordoba, and E. Pilyugina, "Treating Inertia in Passive Microbead Rheology" Physical Review E, 85, 021504, 2012.
Cordoba A., T. Indei, and J. D. Schieber, "Elimination of Inertia from a Generalized Langevin Equation: Applications to Microbead Rheology Modeling and Data Analysis", Journal of Rheology, 56, 185-212, 2012.
Indei T. and J. Takimoto, "Linear Viscoelastic Properties of Transient Networks Formed by Associating Polymers with Multiple Stickers", Journal of Chemical Physics, 133, 194902, 2010.
Indei T. and J. Takimoto, "Viscoelastic Properties of Associating Rouse Chains", Hot Topics in Polymer Science in Japan, 58 (10), 724, 2009.
Indei T., "Effects of Surfactants on the Linear Rheology of Telechelic Associating Polymers", Progress in Colloid & Polymer Science, 136, 23-30, 2009.
Indei T., "Effect of Nonlinearity Strength in Chain Tension on Shear-Thickening of Associating Polymer Networks", Journal of the Society of Rheology Japan (Nihon Reoroji Gakkaishi), 35, 147-153, 2007.
Indei T., "Rheological Study of Transient Networks with Junctions of Limited Multiplicity. II. Sol/Gel Transition and Rheology", Journal of Chemical Physics, 127, 144905, 2007.
Indei T., "Rheological Study of Transient Networks with Junctions of Limited Multiplicity", Journal of Chemical Physics, 127, 144904, 2007.
Indei T., "Necessary Conditions for Shear-Thickening in Associating Polymer Networks", Journal of Non-Newtonian Fluid Mechanics, 141, 18-42, 2007.
Indei T., T. Koga, and F. Tanaka, "Theory of Shear-Thickening in Transient Networks of Associating Polymers", Macromolecular Rapid Communications, 26, 701-706, 2005.
Indei T. and F. Tanaka, "Rheological Study of Transient Polymer Networks Cross-Linked by Two-component Associative Groups -Inversion of the Gel Skeletal Structure-", Journal of Rheology, 48, 641-661, 2004.
Indei T. and F. Tanaka, "Theory of Transient Polymer Networks Cross-Linked by Two-component Associative Groups", Journal of the Society of Rheology Japan (Nihon Reoroji Gakkaishi), 32, 285-293, 2004.
Indei T. and T. Arimitsu, "Analysis of Shear-Thickening in Physical Gel by Transient Network Theory", AIP Conference Proceedings of "3rd International Symposium on Slow Dynamics in Complex Systems", 708, 225-228, 2004.