Department of Materials Science and Engineering Spring Seminar Series: Rahim Rahimi

Description

Rahim Rahimi, an assistant professor of materials engineering at Purdue University, will give a talk on nanomaterials for the Department of Materials Science and Engineering.

Abstract:

Nanomaterials have emerged as transformative components in various scientific and technological applications, contributing to advancements in sensing, energy storage, electronics, biotechnology, and optics. Laser-induced micro/nanostructures have become pivotal in nanomanufacturing, enabling the cost-effective and reproducible production of raw nanomaterials and devices. This talk explores the application of laser processing technologies as scalable and cost-effective methods for producing sensors and devices in health care and environmental monitoring. The first part of the presentation delves into a systematic study on laser processing fundamentals, demonstrating its implementation in selective patterning and functionalization of multilayer plastic films. This approach facilitates the creation of functional conductive patterns and circuitry, leading to the cost-effective production of sensors and wireless communication devices. Emphasis is placed on intelligent food packaging systems, addressing the growing demand for improved food quality and safety. The utilization of roll-to-roll laser-assisted surface modification and micromachining strategies is discussed, showcasing how CO2 and Nd:YAG lasers can significantly reduce manufacturing costs and enhance the production rate of wireless sensors for food packaging applications. The second part focuses on addressing the critical issue of antibiotic-resistant infections and the global spread of pathogens. Laser surface nanotexturing and immobilization technologies are introduced as novel methods to enhance the antibacterial and antiviral properties of metal surfaces, specifically copper (Cu) and silver (Ag). The presentation explores a one-step laser nanotexturing process for Cu surfaces, highlighting its ability to create robust hierarchical micro/mesoporous structures with enhanced antibacterial properties. Additionally, laser nanotexturing and immobilization are used to selectively reduce Ag ionic compounds onto biologically inert titanium (Ti) metal implants, improving cellular integration and antibacterial properties while maintaining bulk mechanical properties. The third part addresses the importance of studying the gut microbiome's interrelationship with host health and diseases. A novel battery-less customizable capsule design with targeted activation and sample collection in the gastrointestinal (GI) tract is presented. The capsule utilizes multi-functional pH-sensitive and superabsorbent polymers for structured assembly, providing a non-invasive and targeted approach to studying microbial diversity and nutrient metabolism along the GI tract. The talk concludes with insights into ongoing efforts, including the integration of position tracking capabilities, 3D printing advancements, and assessing the impact of dietary changes on microbial metabolites and GI-related disease status in animal studies.