Browsing by Subject "Carbon Nanotubes"

Now showing 1 - 3 of 3
  • Thumbnail Image
    Item
    A Life Cycle Risk Assessment Framework of Carbon Nanotubes in the Pharmaceutical Industry
    (Hubert H. Humphrey School of Public Affairs, 2013-06-11) Marquardt, Kevin
  • Thumbnail Image
    Item
    Mesoscopic Distinct Element Method for Multiscale Modeling of Carbon Nanotubes
    (2019-07) xu, hao
    Super strong lightweight material systems comprising carbon nanotubes (CNTs) are especially suitable for aerospace applications. Assembles of CNTs obtained by mechanically stretching the CNT sheets, represent a promising material platform for developing composite materials with mechanical attributes approaching those of individual CNTs. In this quest, the guidance power of computational materials modelling is critical. Ideally one would like to investigate CNT assembles with all atom simulation methods, but this approach is computationally prohibitive. Due to the inherent spatial and temporal limitations of atomistic modeling and the lack of mesoscale models, mesoscopic simulation methods for CNT systems are missing. My work focuses on deriving ultra-coarse-grained models based on mesoscopic dintinct element method (mDEM). Our mDEM model is informed by atomistic data obtained with molecular dynamics (MD) and density functional theory-based tight-binding (DFTB) objective molecular modeling. Our mDEM model is capable of reproducing the atomistic elastic and frictional properties of CNTs. With the mDEM model, tensile tests of mesoscale CNT network were carried out, showing results in good agreement with experiments. The tensile tests revealed nanofriction was a key factor deciding the load transfer of CNT network. Our mDEM model serves as a powerful tool to expand the understanding and guide the development of CNT materials.
  • Thumbnail Image
    Item
    Utilizing Electrical Response from Sensor Displacement to Measure Changes in Force with Textile Integrated Sensors on the Body
    (2020-08) Weber, Michael
    Smart technologies, such as watches and heart rate monitors, are increasingly worn by people for medical, health, and athletic purposes. These technologies have many advantages over older technologies, by being low-cost, easily portable, and body-conforming. Textile integrated sensors, also called smart wearables or e-textiles, are a growing area of research that can address many medical or therapeutic concerns for people. Conductive thread is commonly used in textile integrated sensors, either in the formation of the thread/fabric itself or as stitching on a textile. This thesis discusses two topics relevant to textile integrated sensors over the course of four papers, two published as conference papers in the proceedings of Design for Medical Devices Conference 2019 and 2020, one journal paper prepared for publication, and another journal paper in preparation for submission.