Sorry for my sending a second reminder.

The BNC Faculty Seminar Series is designed to provide faculty a platform to present an overview of their research and the opportunity for collaborative discussion with other BNC faculty and researchers across six colleges and 15 academic units.

Ryan Wagner

Research Assistant Professor, School of Mechanical Engineering

September 23^rd, 2021 | 12:00pm

Join Zoom: https://purdue-edu.zoom.us/j/98695180597

Title: Vibrations and mechanics applied to Multiphysics problems in MEMS, Manufacturing, and Microscopy

Abstract: At the macroscale, microscale, and nanoscale vibrations and mechanics can be exploited for metrology in process monitoring, system design, and diagnostics.   In this talk, I will discuss three vibration and mechanics based metrology problems across these three length scales. At the macro-scale, roll-to-roll systems enable scalable manufacturing of flexible electronic devices.  The magnitude and distribution of web tension can have a significant effect on device yield and performance.  To address this, we have developed a vibration-based metrology system for measuring the tension distribution within the web substrate.  At the microscale, microcantilever-based radio frequency capacitance switches are an important MEMS device.  Stiction failure, where the cantilever becomes stuck to the dielectric surface is an important failure mode.  We used the Atomic Force Microscope (AFM) as a surrogate system for studying the dynamic detachment of a microcantilever from a surface.  This is a possible recovery mechanism for fixing failed devices.  At the nanoscale, the detailed modeling of viscoelastic contact mechanics is important for simulating the interactions between an AFM cantilever tip and soft, viscoelastic surfaces.   Commonly employed models for this are often ad-hoc in nature leading to inconsistent predictions of surface behavior.  We have developed a computationally improved implementation of Attard’s model, a rigorous first principles contact mechanics model that enables accurate prediction of surface dynamics for soft, viscoelastic materials.  We have deployed this model in our online AFM simulation tool VEDA, which is found on nanoHUB.org.

Bio:  Ryan Wagner is a Research Assistant Professor in the School of Mechanical engineering at Purdue University.  He received his B.S. and Ph.D. both in Mechanical Engineering from Purdue in 2008 and 2014 respectively.  His graduate research topic was the application of AFM to study the mechanics of cellulose-based nanomaterials.  Ryan was awarded a National Research Council postdoctoral fellowship at the National Institute of Standards and Technology where he worked on AFM metrology and cavity optomechanics.  After this postdoc, Ryan was employed as a Research and Development Scientist at Asylum Research, an AFM instrument manufacturing company.   Ryan’s research interests include metrology, microscopy, interferometry, spectrometry, vibrations, and dynamics.

Previously recorded talks: https://engineering.purdue.edu/Intranet/Groups/BNC/FacultySeminars

Upcoming BNC Virtual Faculty Seminars and Recorded Talks, Fall 2021:

Date	Faculty	Title
9/23/21	Ryan Wagner, Research Assistant Professor, School of Mechanical Engineering	Vibrations and dynamics applied to Multiphysics problems in MEMS, Manufacturing, and Microscopy
9/30/21	Arun Kumar Mannodi Kanakkithodi, Assistant Professor, School of Materials Engineering	Tuning Optoelectronic Properties of Semiconductors using High-Throughput Computations and Machine Learning
10/7/21	Michelle Thompson, Assistant Professor, Department of Earth, Atmospheric, and Planetary Sciences	From Atomic Scales to Asteroid Surfaces: Understanding Airless Bodies through Coordinated Analyses
10/14/21	Xiaoping Bao, Assistant Professor, Davidson School of Chemical Engineering	Engineer and Manufacture Off-the-Shelf CAR-NK Cells for Targeted Cancer Immunotherapy
10/21/21
10/28/21	Andres Arrieta, Assistant Professor, School of Mechanical Engineering
11/4/21	Tian Li, Assistant Professor of Mechanical Engineering	Naturally Nanostructured Cellulose towards Energy Water Nexus
11/11/21	Caitlin Proctor, Assistant Professor of Agricultural and Biological Engineering & Environmental and Ecological Engineering	Biofilms in Everyday Life
11/18/21