Sun Nov 23 17:44:26 UTC 2025: Summary:
Researchers at the Raman Research Institute (RRI) have developed a novel device to observe the behavior of non-Newtonian fluids (like gels, shampoos, and industrial solutions) at a microscopic level. The device combines a rheometer with in-situ optical imaging, allowing scientists to measure the forces exerted on a probe moving through the fluid while simultaneously visualizing the structural changes. The study revealed that at higher speeds, the fluid exhibits “chaotic motion,” where resistance builds and abruptly releases, forming a “wake” behind the probe that stretches and snaps. This discovery highlights the importance of understanding local structures within the fluid to optimize material design for various industries, potentially improving processes like oil recovery and cosmetic production.
News Article:
Indian Researchers Unveil Device to Unlock the Secrets of Everyday Fluids
Bengaluru, November 24, 2025 – Scientists at the Raman Research Institute (RRI) have announced a breakthrough in understanding the complex behavior of non-Newtonian fluids, a class of substances that includes everything from shampoo to industrial chemicals. Their newly developed device, which combines force measurement with real-time microscopic visualization, allows researchers to observe how these fluids respond to movement at an unprecedented level of detail.
Unlike water or cooking oil, non-Newtonian fluids exhibit unusual flow properties due to their internal structure. Until now, understanding how these fluids rearrange themselves in response to movement has been a challenge. The RRI’s device, built around a custom-modified rheometer, allows researchers to track the forces exerted on a probe moving through the fluid while simultaneously observing the microscopic changes.
The study revealed that at higher speeds, these fluids exhibit chaotic motion, characterized by the formation of a “wake” that stretches and snaps, causing abrupt changes in resistance. “The design of the custom-built set-up provides the flexibility and freedom to explore many aspects in the context of probe motion to access, measure and reveal the behaviour of complex materials,” said Abhishek Ghadai, PhD scholar at RRI and lead author of the research.
The findings underscore the importance of examining local structures within the fluid, rather than treating it as a uniform substance. This knowledge could have significant implications for various industries, enabling companies to fine-tune materials for improved performance and efficiency. For example, the research could lead to better oil-recovery processes or cosmetic products that spread more evenly.
“Our study highlights the importance of investigating the mechanics of materials over different length scales to understand complex materials for applications and fundamental scientific interests,” said Prof. Sayantan Majumdar, faculty member at RRI, who led the project.
The research team believes that their device will open new avenues for material design and optimization across a wide range of industries, leading to more predictable and efficient processes.
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