Frontiers in Materials Science, Engineering, and Technology: An FMD Symposium in Honor of Sungho Jin: Structure-Property-Performance Correlations: Carbon Nanotubes, Boron Nitride and Biomaterials
Sponsored by: TMS Functional Materials Division, TMS: Biomaterials Committee, TMS: Electronic Packaging and Interconnection Materials Committee, TMS: Nanomaterials Committee, TMS: Thin Films and Interfaces Committee
Program Organizers: Fay Hua, Intel Corporation; Tae-Kyu Lee, Portland State University; Young-Ho Kim, Hanyang University; Roger Narayan, UNC/NCSU Joint Department of Biomedical Engineering; Choong-un Kim, University of Texas at Arlington; Nuggehalli Ravindra, New Jersey Institute of Technology

Tuesday 8:30 AM
February 28, 2017
Room: 33B
Location: San Diego Convention Ctr

Session Chair: Seung Kang, Qualcomm Incorporated; Roger Narayan, UNC/NCSU

8:30 AM Introductory Comments

8:40 AM  Invited
Multifunctional Carbon Nanotube Films and Composites: Liwen Zhang1; Xin Wang1; Qingwen Li2; Yuntian Zhu1; 1North Carolina State University; 2Suzhou Institute of Nanotechnology and Nanobionics
    In this talk, I’ll present the production of carbon nanotube (CNT) films and composite prepregs using a novel approach, mico-combing. The CNT films and composites have high strength, excellent electrical conductivity and high thermal conductivity. These superior properties are primarily derived from the long length, high volume fraction, good alignment and reduced waviness of the CNTs that are produced. The combination of high strength and excellent electrical and thermal conductivities makes CNT composites a promising for new electronic technologies and high-strength lightweight aerospace applications. The nanotechnology here is conducive to large-scale production of carbon nanotube films and composites at low cost.

9:10 AM  Invited
Boron-Filled Hybrid Carbon Nanotubes: Rajen Patel1; Alokik Kanwal2; Tseng-Ming Chou3; Joseph Lefebvre4; Frank Owens5; David Apigo2; Zafar Iqbal2; 1Picatinny Arsenal, NJ; 2NJIT; 3SIT; 4Hysitron; 5Hunter College
    A new type of nanostructure synthesized using a one-step chemical vapor deposition process will be discussed, a boron-filled hybrid carbon nanotube (BHCNT). The method of synthesis of these structures is a modification of a technique successfully used to grow pure boron nanowires. The product of this reaction, when imaged by electron microscopy, was found to be a core-shell hybrid nanotube, where the interior of the structure consists of a boron nanowire and the exterior is essentially a distorted multiwalled carbon nanotube (CNT). Practically, BHCNTs have some important differences from CNTs. They are highly insulating, making them suitable for applications where that is a requirement. BHCNTs are also up to 31% stiffer and 233% stronger than CNTs and maintain superior mechanical properties at elevated temperatures. Due to their unique properties and structure, BHCNTs are a significant advance in the field of nanocarbon science and engineering.

9:40 AM  
Direct Conversion of h-BN into Phase Pure c-BN and Size Dependent Raman Spectroscopy of Nano and Micro Structures, and Thin Films of c-BN: Ariful Haque1; Anagh Bhaumik1; Jagdish Narayan1; 1NCSU
    We discovered single step conversion of hexagonal boron nitride (h-BN) into phase pure cubic boron nitride (c-BN) by laser annealing technique. The h-BN thin films were deposited on c-sapphire substrate by pulsed laser deposition technique using pulsed KrF laser. An ArF nanosecond excimer laser was used for rapid melting and super undercooling and quenching to convert the h-BN into c-BN at ambient temperature and pressure. The diameter of the crystallite c-BN structures ranging from few nanometers to hundred micrometers can be controlled by varying the laser parameters. The Raman spectra of LO and TO modes of c-BN were found to be increasingly asymmetric, broader, and shifted towards lower wave numbers with decreasing crystal size. The structure determination and phase identification performed by electron back scattered diffraction (EBSD) technique in the c-BN nano crystals and large area thin films confirm high crystallinity and phase purity in this versatile material.

10:00 AM Break

10:15 AM  Invited
Catalyzed BNNT Growth on Metallic Substrates: Vijayesh Kumar1; Debrupa Lahiri1; Indranil Lahiri1; 1Indian Institute of Technology Roorkee
    Being structurally analogous to carbon nanotubes (CNTs), boron nitride nanotubes (BNNTs) have similar properties such as high mechanical strength and chemical resistance. Synthesis of BNNTs is quite challenging due to high temperature growth condition as well as the stoichiometry. Synthesis of nanotubes depends on catalyst, substrate and growth parameters. Selection of suitable catalyst and substrate for growth of BNNTs has been a major challenge in broadening its field of applications. In this reported method, growth of BNNTs was performed directly on conducting substrate, which was anticipated to open various application possibilities for BNNTs, such as electronics, optoelectronics and piezoelectric applications. Tungsten and copper were chosen as substrate and catalyst, respectively. This combination was found to be promising for direct synthesis of multiwall BNNTs (MW-BNNTs) on a conducting substrate.

10:45 AM  
Remarkable Conversion of p to n Type Reduced Graphene Oxide (rGO) by Laser Annealing Technique at Room Temperature and Pressure: Anagh Bhaumik1; Ariful Haque1; Jagdish Narayan1; 1North Carolina State University
    This research illustrates successful wafer scale integration and p to n type conversion of 2D rGO employing pulsed laser deposition followed by pulsed laser annealing using nanosecond ArF excimer laser. The rGO thin films grown onto c-sapphire employing pulsed laser deposition in laser MBE chamber are intrinsically p type in nature. Subsequent laser annealing using different laser energy densities: 0.6Jcm-2, 0.8Jcm-2 and 1.0Jcm-2 at room temperature and pressure converts p type rGO to n type semiconductor. XRD, SEM, Raman spectroscopy, Hall measurements, XPS, PL, and temperature dependent resistivity measurements are done to characterize the samples. Temperature dependent resistivity data of rGO thin films follow Efros-Shklovoskii variable range hopping (ES-VRH) model in the low-temperature region and Arrhenius conduction in the high-temperature regime. This wafer scale integration of rGO with c-sapphire and p to n type conversion at room temperature and pressure will be useful for large area rGO based electronic devices.

11:05 AM  Invited
Preparation and Characterization of Ceramic Scaffolds: Joanna McKittrick1; Steven Naleway1; Michael Frank1; Jae-Young Jung1; Frances Su1; 1University of California, San Diego
    Bioinspired materials and structures have widespread applications, including the aerospace, and medical fields. One synthetic processing method to form bioinspired materials is freeze casting, which can be used to form ceramic scaffolds that have structures resembling bone. These scaffolds can be subsequently infiltrated with polymers to form robust composites. This presentation will review potential applications of these composites in the biomedical field. This work is supported by a Multi-University Research Initiative through the Air Force Office of Scientific Research (AFOSR-FA9550-15-1-0009).

11:35 AM  Invited
Development of Biodegradable Magnesium Alloys: Kwang Seon Shin1; Ahmad Bahmani1; 1Seoul National University
    It is known that magnesium alloys are biodegradable in the human body. Therefore, magnesium implants do not need to be removed by a second surgical operation. Due to these advantages, magnesium alloys are the most highlighted materials in recent years for new generation implants. However, the currently available magnesium alloys have limited corrosion resistance and mechanical strength for implant applications. In order to overcome these problems, it was attempted to develop new magnesium alloys with high strength and corrosion resistance in this study. New magnesium alloys were prepared using different processing routes. The microstructures of these alloys were examined by optical and scanning electron microscopy, and X-ray diffraction method. The mechanical properties were characterized with Vickers hardness and tensile tests. Various corrosion properties were examined using potentio-dynamic polarization test and hydrogen evolution test. The effects of alloying elements and different processing routes on mechanical and corrosion properties will be presented.