Seminar"Sweeping SMaRTer: Advances in Chirp Rheology for Time-Resolved Analysis"Jarno L. Waeterloos

Micro/Bio/Nanofluidics (Shen) Unit would like to invite you to the seminar by Jarno L. Waeterloos on August 19 (Tuesday).
 
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Date:   August 19, 2025
Time:  11:00-12:00
Venue: C209, OIST
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Speaker:

Jarno L. Waeterloos
PhD student
Soft Matter, Rheology and Technology
Chemical Engineering Department, K.U. Leuven, Leuven, Belgium

Title:

Sweeping SMaRTer: Advances in Chirp Rheology for Time-Resolved Analysis

Abstract:

Chirp rheology is redefining how we study the mechanical behavior of soft and complex materials. By replacing traditional frequency sweeps with rapidly modulated chirp signals, researchers can now access time-resolved viscoelastic spectra in minutes rather than hours - crucial for systems that evolve during measurement, such as gels, thixotropic fluids, and reactive mixtures.

This seminar traces the evolution of chirp rheology, from its foundational principles to recent breakthroughs in waveform design and experimental methodology. We highlight the development of double exponential chirps (DECs), which overcome high-frequency artefacts and signal-to-noise limitations, enabling robust analysis of mutating systems. We also explore the integration of chirp techniques with orthogonal superposition (OSP), allowing simultaneous probing of steady and oscillatory responses.

Beyond linear viscoelasticity, the talk introduces nonlinear chirp rheology, a frontier that combines timefrequency analysis with harmonic resolution strategies such as Gabor transforms and dechirping. These tools open new possibilities for characterizing materials under realistic, dynamic conditions.

Whether you're working with soft matter, complex fluids, or evolving materials, this presentation offers insights into how smarter sweeping techniques are expanding the capabilities of rheological analysis.

Host:
Prof. Amy Shen