Nanotechnology for Energy, Environment, Electronics, Healthcare and Industry: On-Demand Oral Presentations
Sponsored by: ACerS Electronics Division, TMS: Mechanical Behavior of Materials Committee
Program Organizers: Gary Pickrell, Virginia Tech; Navin Manjooran, Solve
Friday 8:00 AM
October 22, 2021
Room: On-Demand Room 11
Location: MS&T On Demand
Substituent Effects on the Solubility and Electronic Properties of the Cyanine Dye Cy5: Austin Biaggne1; Jeunghoon Lee1; William Knowlton1; Bernard Yurke1; Lan Li1; 1Boise State University
The solubility and electronic dipole properties of Cy5 dyes are of interest for their effects on the excitonic properties of Cy5 dye aggregates. By modifying the ends of Cy5 dyes to include substituent groups, the dye monomer’s properties can be tailored. Using density functional theory methods, it was found that substituents increase the hydrophilicity of Cy5 dyes. Dyes with two electron withdrawing substituents or one withdrawing and one donating substituent were found to have static dipole differences up to three times that of pristine Cy5. The increase in static dipole differences was found to be positively correlated with the sum of the substituent Hammett constants. Using molecular dynamics simulations, it was found that DNA templating can bring the dyes to within a nanometer of each other with oblique orientations. This research was supported fully by the Department of Navy, Office of Naval Research, award No. N00014-19-1-2615.
Dissolution of Atherosclerosis Plaque in Human Coronary Artery Induced by Nanobubbles: Ao Li1; James Earthman2; 1University of California Irvine; 2UCIrvine
Atherosclerosis causes approximately 30% of global mortalities each year. Invasive treatments for atherosclerosis, such as coronary stent placement, have been widely used. However, they are generally exceptionally expensive and may lead to detrimental side effects. Bulk nanobubbles (NBs) were observed to capture nanoparticles and form clusters in various liquids. We have proposed that clustering of embryo nanoparticles can induce the dissolution of bulk forms of the same compound which is in the nanoparticles. This phenomenon raises the possibility for applying NBs for treating calcified plaque to dissolve the calcium compounds within the plaque. In the present study, ex vivo human coronary artery samples with atherosclerosis plaque were exposed to NBs in circulating Ringer’s solution. Within a 4 hour exposure, the volume of the plaque decreased by 18% to 40% in the presence of NBs while much smaller reductions were observed in untreated Ringer’s solution control experiments.
Skin-wearable PDMS-based Electronic Decals by Aerosol Jet 3D Printing: Jacob Brenneman1; Derya Tansel1; Gary Fedder1; Rahul Panat1; 1Carnegie Mellon University
Thin (<100 μm) stretchable substrates with embedded electronic circuits enable comfortable skin-wearable health monitoring devices. However, fabricating stretchable electronics by conventional processes at high temperatures such as solder reflow can affect the integrity of the stretchable materials. In this work, we demonstrate an Aerosol Jet-based 3D printing method to create stretchable low-resistance, insulated interconnect system embedded in 30−60μm-thick PDMS substrate. The system is shown to survive an applied strain of 40%, suitable to be used as skin-wearable electronic decals. The key features in the process are the sintering at 300°C of aerosol-jetted silver wiring and its encasement with aerosol-jetted polyimide layers to form a tough insulating jacket. The direct digital printing on and within PDMS provides rapid design flexibility and a clear path toward interconnect/interface stress management for integration with embedded functional chips.
Targeted Disinfection of Pathogenic Bacteria Using a Nanostructured Electrocatalytic Device: Hammad Malik1; Rachel D'Agostini1; Eian Brightwell1; Dustin Williams1; Swomitra Mohanty1; Krista Carlson1; 1University of Utah
The electronic structure of the anode material greatly influences their bacterial inactivation efficiency. This study details the impact of annealing on the electrochemical response of the anodically formed titanium oxide nanotubes. A series of electrochemical measurements were carried out on the annealed titanium oxide nanotubes for understanding the relationship between the crystalline phases present and the resulting electrochemical response. The changes in the flat band potential, double layer capacitance, oxygen evolution potential and other measurements were done using the Electrochemical Impedance Spectroscopy and Linear sweep voltammetry. These measurements helped in understanding the relation between the crystalline phases present and the efficacy of the anode material for bacterial inactivation.
Fabrication of Dendrite Structure Silver Nanowires / Polymer Nanocomposite for Transparent Flexible Pressure Sensor: Zhiming Shen1; Narongdet Sulatchaneenopdon1; Hyoung-Won Son1; Hisayuki Suematsu1; Tadachika Nakayama1; 1Nagaoka University of Technology
Conductive polymer composites (CPCs) fabricated by mixing conductive filler and insulated polymer are widely used in flexible piezoresistive pressure sensors. However, the percolation theory shows that in order to form a conductive path between the fillers, a high volume fraction of fillers is required, which gives rise to filler aggregation problem, low transparency properties, and high cost. We use silver nanowires (AgNWs) and silicone to fabricate conductive polymer composites. By controlling the orientation and movement of AgNWs through an external electric field, we found that the closely connected AgNWs showed a dendritic structure instead of randomly distributed. This dendritic structure has shown superiority in terms of an ultra-low percolation threshold.