Advances in Synthesis and Integration Methods for Enhanced Properties, and Applications in Emerging Nanomaterials: Functional Materials and Nanocomposites
Sponsored by: TMS: Nanomaterials Committee
Program Organizers: Chang-Yong Nam, Brookhaven National Laboratory; Jung-Kun Lee, University of Pittsburgh; Zubaer Hossain, University of Delaware

Wednesday 2:00 PM
November 4, 2020
Room: Virtual Meeting Room 25
Location: MS&T Virtual

Session Chair: Jung-Kun Lee, University of Pittsburgh; Chang-Yong Nam, Brookhaven National Laboratory; Zubaer Hossain, University of Delaware


2:00 PM  Invited
Laser Processing of Soft Magnetic Amorphous and Nanocrystalline Alloys: Paul Ohodnicki1; Ahmed Talaat1; Jorg Wiezorek1; 1University of Pittsburgh
    Current state of the art soft magnetic materials for medium frequency and high power applications are metal amorphous nanocomposite (MANC) alloy systems manufactured through partial devitrification of an initially amorphous precursor. Recent work has demonstrated the potential to dramatically increase the number of crystalline nuclei that form through rapid thermal annealing processes, thereby producing refined microstructures with enhanced soft magnetic performance. In this work, we explore laser-based processing of a range of different alloy systems in order to produce rapid thermal heating profiles in a scalable and manufacturable configuration which can be readily translated to in-line and pilot-scale production facilities. A comparison of traditional and laser annealing approaches will be presented along with the results of structural and magnetic property characterization.

2:30 PM  Invited
Multi-functional Surfaces: Paul Leu1; Sajad Haghanifar1; Anthony Galante1; 1University of Pittsburgh
    New bio-inspiration, micro-/nanomaterials, physics, and micro-/nanomanufacturing processes offer unprecedented opportunities in engineering surfaces for novel photon management strategies, difficult-to-realize material–property combinations, and new multi-functionality. In this talk, we discuss some of my research group’s recent progress in the creation of multi-functional surfaces. We discuss optical properties such as broadband and broad angle antireflection as well as haze. In addition we discuss functionalities such as self-cleaning, stain-resistance, anti-fogging, and anti-biofouling. Finally, we discuss major challenges with the issue of mechanical durability in these surfaces and potential strategies for addressing these issues. These surfaces may have a wide range of applications including optoelectronic devices, medical textiles, and healthcare surfaces.

3:00 PM  
Low-reflectivity Carbon Nanotube Coatings for Space Applications: Dan Wang1; Peter Fuqua2; Amber Hennessy2; Alan Hopkins2; Timothy Hall1; Stephen Snyder1; Maria Inman1; Jennings Taylor1; 1Faraday Technology Inc; 2The Aerospace Corporation
    Space observatory missions requires the development of low-reflectivity surfaces for space-borne instruments, such as seeker telescopes, optical sensors, etc., to minimize stray and reflected light across the visible and infrared wavebands for facilitating the direct exoplanet detection and characterization. The excellent optical absorption performance and light weight of carbon nanotubes (CNTs) make them as ideal coating materials for obtaining low reflectivity surfaces. In this presentation, we will discuss the feasibility of a low-cost, efficient and scalable manufacturing process for the deposition of durable, low reflectivity carbon nanotube black coatings based on the use of pulse and pulse reverse electrophoretic deposition technology. The low-reflectivity CNT coatings have been successfully deposited on various surfaces, including flat, bent, and sharp substrates. The CNT coatings show the reflectance of 0.4% ~ 0.8% across visible to near infrared (NIR) wavebands.

3:20 PM  
Investigating the Micro-structure and Transport Mechanisms in Graphene Copper Composites: Raju Ghimire1; Mehran Tehrani1; 1The University of Texas at Austin; University of New Mexico
    The addition of graphene (GN) to copper (Cu) has shown to enhance the physical properties of copper. Charge conduction in these nanocomposites is controlled by the microstructure of copper as well as nanoscale interfacial phenomena between the GN and Cu, effects of both of which are investigated in this study. Combinations of different carrier density and mobility in Cu-GN composites are first analytically investigated. Secondly, GN-Cu samples with electrical conductivities surpassing copper by as much as 10% were fabricated. The microstructures of these samples were experimentally examined using electron backscatter diffraction (EBSD). Finally, in-situ conductivity measurements of the Cu-GN interfaces were carried out. These measurements are correlated to the microstructure of the samples and provide new insights into transport mechanisms in nanocarbon-metal composites.

3:40 PM  Cancelled
Electrical Properties of Transition Metal Chloride Intercalated Carbon-based Materials: Pouria Khanbolouki1; Mehran Tehrani1; 1The University of Texas at Austin
    Carbon nanotube and highly graphitic carbon fibers were intercalated with transition metal chlorides using a two-zone vapor transport method. The progress of the reaction was monitored in situ via electrical resistance measurement. The temperature dependence of the electrical conductivity of the intercalated fibers was measured and correlated with their structure and composition. The intercalation mechanism and stability of the intercalated compounds for the two types of fibers are discussed. Finally, numerical modelling was used to identify the potential of these intercalated materials for practical applications.