8th European Workshop On Structural Health Monitoring (EWSHM 2016)
5-8 July 2016, Spain, Bilbao
Right Now in Bilbao 00:30 Wed 27
17:30 Wednesday 6. Jul - A3B
Poly(Acrylic Acid) Coated Gold Nanoparticles for pH Sensing Applications
Abstract »Traditionally, the use of physical sensors placed spatially throughout a structure, coupled with large-scale data collection systems and advanced computer algorithms have been used to detect, localize and communicate material damage. Though these systems have proven effective for a variety of applications, they are inherently hindered by their requirements for continuous data collection and power consumption. This research seeks to reduce, and ultimately eliminate, the need for data collection and power consumption through the development of a colorimetric ‘smart polymer’ based sensing system. Utilizing the plasmonic properties of metallic nanoparticles, this gold nanoparticle (AuNP) based system has been shown to detect changes in solution pH through distinct shifts in optical absorbance properties. For the purposes of this research, a ligand exchange between natively bound citrate capping ligands present on gold nanoparticles is performed with poly(acrylic acid) (PAA) and exposed to fluctuations in solution pH. It is hypothesized that the swelling and de-swelling of surrounding PAA polymer matrix in response to pH changes and the corresponding movement and interaction of individual AuNPs results in distinct shifts of the observed optical properties; indicative of a change in the surrounding solution properties. By monitoring shifts in optical properties, we herein evaluate the effectiveness of a PAA/AuNP system as an alternative methodology for detecting and communicating chemical fluctuations in solution pH. Furthermore, it is hypothesized that this work can be implemented and expanded towards the development of novel films capable of responding to both chemical and mechanical stimuli due to the presence of gold nanoparticles.
AuthorsBrubaker, Cole Dylan*Brubaker, Cole Dylan*
Cole Brubaker is a second year graduate student in the Civil Engineering Dept. at Vanderbilt University. Research interests are related to the development of in situ and intrinsic sensing technologies for a variety of SHM and NDE applications. Namely, these research interests are related to the use of nanoparticles, quantum dots and polymeric materials to develop new and novel 'smart sensors' and 'smart materials'.
USAFrecker, TalithaFrecker, Talitha
USANjoroge, IanNjoroge, Ian
USAJennings, Kane G.Jennings, Kane G.
USAAdams, DouglasAdams, Douglas
: Dr. Douglas Adams is the Daniel F. Flowers Professor and Distinguished Professor and Chair of Civil and Environmental Engineering at Vanderbilt University and Professor of Mechanical Engineering. His research in material and structural system state awareness identifies unique signatures that illuminate how materials and machines degrade in energy, security, and manufacturing applications. He has conducted over 120 sponsored programs, written 260 technical papers, and authored a textbook on structural health monitoring as well as several book chapters. Research awards he has received include the Presidential Early Career Award for Scientists and Engineers, Society of Experimental Mechanics DeMichele Award, Structural Health Monitoring Person of the Year Award, and he was elected a Fellow of ASME in 2011. Dr Adams has been Managing Editor of the SHM Inttnal Journal
Session: AAA - Keynotes
Title: Structural Health Monitoring, The Beginning and the End