Short Courses: 12-13 October 2024

LAOS Rheology: a start-to-finish guide (a one-day short course)

October 12, 2024 (Saturday)

Automated Rheology and Application to Multi-methods Measurements (a one-day short course)

October 13, 2024 (Sunday)

Participants have the option of taking a two-day short-course bundle at discounted costs.

All classes will begin at 8:30 am in Austin Marriott Downtown.

The short courses are held in conjunction with the 95th Annual Meeting of The Society of Rheology (October 13-17, 2024). Check out the lodging information page.

Register (coming soon)


Short Course Registration Info

Short course registration includes a complete set of course notes. Payment can be made on line with MasterCard, Visa, or American Express. Lunch and snacks for the breaks will be provided each day for in-person participants.

LAOS Rheology: a start-to-finish guide

Simon Rogers, Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign

Course Description

Large amplitude oscillatory shearing (LAOS) is a popular method of probing the transient nonlinear rheology of a wide range of soft materials. The ability to tune the strength of the flow with the amplitude and the timescale with the frequency allows LAOS to stand in for a variety of real-world applications. While it’s an easy test to perform, how to understand the results obtained from such tests has been the subject of study for decades. This course will provide historical context of our understanding of LAOS as well as teach participants the fundamental rheological concepts behind the protocol, the dimensionless groups that are often used to describe LAOS, how to perform experiments in ways that allow maximum extraction of information, and how to interpret results. A particular emphasis of the course is to show how connections between LAOS and responses to other protocols. Attendees will benefit from pre-existing familiarity with the concepts of stress, viscoelasticity, non-Newtonian rheology, and rheometry. The course will include experimental demonstrations of LAOS measurements of materials that yield and how the obtained data can be analyzed and used for constitutive model determination.

Course Outline
  • An Introduction to LAOS and Historical Development (1.0 hr)
  • Why use oscillatory shear? How large is large? What is LAOS used for? How has our understanding developed?
  • Fundamental Rheological Concepts in LAOS (1.0 hr)
  • Small amplitude material functions and extensions to large amplitudes. Dimensionless groups. Time and deformation domain analyses.
  • Beyond Material Functions (1.0 hr)
  • Connections to other flow types and generation of constitutive relations.
  • Demo (2.0 hr)
  • Making good LAOS measurements and beyond – what more information can be obtained?
  • Discussion of Student Questions (30 min)
Instructor
Photo of Simon Rogers
Simon Rogers

University of Illinois at Urbana-Champaign

Simon Rogers is Associate Professor of Chemical Engineering at the University of Illinois at Urbana-Champaign. Before joining the faculty at UIUC, he received his B.Sc., B.Sc. (Hons), and PhD in Physics from Victoria University of Wellington, in New Zealand. He performed postdoctoral research at FORTH in Crete, Forschungzentrum Juelich in Germany, and at the University of Delaware. Prof. Rogers’ research focuses on understanding the fundamental physics behind time-dependent phenomena exhibited by soft condensed matter systems for biomedical, energy, and environmental applications. Toward this aim, a particular focus of the Rogers lab is the integration of rheological, structural and flow measurements to monitor material processing in situ. Rogers’ research has been recognized with early career awards from the National Science Foundation, American Chemical Society, and The Society of Rheology.

Automated Rheology and Application to Multi-methods Measurements

Jeffrey Richards, Chemical and Biological Engineering, Northwestern University

Thibaut Divoux, CNRS / ENS de Lyon

Course Description

Recently deployed open software concepts in commercial rheometers have made possible automation of rheological experiments without interaction with the graphical user interface. In this short course, we will illustrate how Python can be leveraged to control a rheometer and how data streams from the rheometer can be utilized to perform multi-method experiments, synchronizing the activities of the rheometer and other test equipment. This short course has broad applicability to a variety of in situ rheometric techniques that couple rheology with other measurement tools to probe the properties of samples under test. Attendees will benefit from pre-existing familiarity with programming concepts such as instrument control and data acquisition. For that audience, this course will serve as a first introduction to interacting with an Application Programming Interface. A particular emphasis of the course is the illustration of multi-methods measurements using rheo-electric measurements, where impedance measurements are made on a sample at the same time as rheology is measured. Our focus will seek to understand how the formulation and processing of complex fluids whose electrical properties change dramatically under different flow conditions (e.g., lithium-ion battery slurries, carbon black gels, graphene dispersions, etc.) can be informed by these measurements. This demonstration will show how impedance measurements on slurries subjected to shear in a rheometer can be used to overcome the challenges related to characterizing the rheology of these slurries. A special emphasis will be placed on the impact that flow history has on the electric impedance, which is a highly sensitive probe of the slurry microstructure and its response to processing. Impedance correction protocols will be reviewed, and standard rheological protocols for slurry characterization discussed. Theories and scaling laws will be reviewed connecting elasticity to electrical behavior.

Course Outline
  • An Introduction to Soft Solids and their Fluid-Solid Transitions (1.0 hr)
  • Understanding Soft Material building blocks and how their properties emerge from their microscopic interactions.
  • Automation of Rheometers and Multi-Modal Measurements (1.0 hr)
  • Programming in Python, Instrument Control and Data Acquisition.
  • Introduction to Electrical Spectroscopy and Rheo-electric Measurements (1.0 hr)
  • Basics of data correct, impedance spectroscopy, and categories of materials that benefit from rheo-electric measurements.
  • Demo (2.0 hr)
  • Rheometer basics - Rheological tooling, what, when, where and why? - Measurement strategies - Problems & mistakes!
  • Discussion of Student Questions (30 min)
Instructors
Photo of Jeffrey Richards
Jeffrey Richards

Northwestern University

Dr. Jeffrey Richards received his PhD in August 2014 from the Department of Chemical Engineering at the University of Washington. After graduating from UW, he performed his postdoctoral work at the University of Delaware and the NIST Center for Neutron Research in Gaithersburg, MD as a National Research Council Fellow. Dr. Richards joined the Department of Chemical and Biological Engineering at Northwestern in 2018 where his current research focuses on engineering the properties of soft materials for electrochemical energy storage applications. During his time at Northwestern, Dr. Richards has been awarded the National Science Foundation’s CAREER award and the American Chemical Society’s Distinguished New Investigator Award.

Photo of Thibaut Divoux
Thibaut Divoux

CNRS / ENS de Lyon

Thibaut Divoux, a CNRS research scientist since 2012, specializes in soft matter physics and experimental rheology. His research has generated original insights on amorphous soft materials both from a fundamental perspective, and in various industrial sectors including pharmaceuticals (e.g., agarose gels), food (e.g., yoghurts), construction (e.g., tile adhesive), and energy storage (e.g., conductive suspensions of carbon black or graphite oxide). His expertise encompasses complex fluids, dense suspensions, gels and soft composites that he investigates by rheometry coupled with local techniques such as velocimetry, dielectric measurements, and IR spectroscopy. Additionally, he performs local mechanical tests using atomic force microscopy, micro- and nano-indentation to understand how local mechanical properties translate in the macroscopic response of these viscoelastic materials. He was awarded the 2018 Metzner Prize of the Society of Rheology for his work on the shear-induced yielding transition in Soft Glassy Materials. Since 2023, he is serving as co-director of the GDR SoPhy, aiming to unite national and international research efforts in physics of soft precursors for hard materials with over 300 members spread in 60 laboratories.