A5029564235- Fiber-reinforced polymer composites
- Carbon Nanotubes in Composites
- Tribology and Wear Analysis
- Natural Fiber Reinforced Composites
- Mechanical Behavior of Composites
- Additive Manufacturing and 3D Printing Technologies
- Polymer Nanocomposites and Properties
- Muon and positron interactions and applications
- Polymer crystallization and properties
- Graphene research and applications
- Additive Manufacturing Materials and Processes
- Bone Tissue Engineering Materials
- Graphene and Nanomaterials Applications
- Advanced Cellulose Research Studies
- High-Velocity Impact and Material Behavior
- Material Properties and Applications
- Epoxy Resin Curing Processes
- Smart Materials for Construction
- Supercapacitor Materials and Fabrication
- Nanocomposite Films for Food Packaging
- Membrane Separation Technologies
- Welding Techniques and Residual Stresses
- Polysaccharides and Plant Cell Walls
- Injection Molding Process and Properties
- Nanotechnology research and applications
Eaton (United States)
2023-2024
Material Measurement Laboratory
2016-2023
National Institute of Standards and Technology
2016-2023
Theiss Research
2017-2023
Rensselaer Polytechnic Institute
2011-2016
Clarkson University
2013
Conventional graphitic anodes in lithium-ion batteries cannot provide high-power densities due to slow diffusivity of lithium ions the bulk electrode material. Here we report photoflash and laser-reduced free-standing graphene paper as high-rate capable for batteries. Photothermal reduction oxide yields an expanded structure with micrometer-scale pores, cracks, intersheet voids. This open-pore enables access underlying sheets facilitates efficient intercalation kinetics even at ultrafast...
Carbon molecular sieve (CMS) membranes prepared by carbonization of polymers containing strongly size-sieving ultramicropores are attractive for high-temperature gas separations. However, need to be carbonized at extremely high temperatures (900° 1200°C) achieve sub-3.3 Å ultramicroporous channels H2/CO2 separation, which makes them brittle and impractical industrial applications. Here, we demonstrate that can first doped with thermolabile cross-linkers before low-temperature retain the...
Most attempts to emulate the mechanical properties of strong and tough natural composites using helicoidal films wood-derived cellulose nanocrystals (w-CNCs) fall short in performance due limited shear transfer ability between w-CNCs. This shortcoming is ascribed small w-CNC-w-CNC overlap lengths that lower efficiency. Herein, we present a simple strategy fabricate superior CNC with rival those best materials are some reported for photonic thus far. Assembling w-CNCs minority fraction high...
Extrusion-based additive manufacturing (AM) of polymer composites exhibits complex thermally driven phenomena that introduce severe discontinuities in the internal structure across length scales, especially voids or porosity. This study utilizes a high-throughput porosity characterization technique to analyze large datasets from numerous micro-computed tomography (μCT) scans capture influence AM print parameters on size, shape, and location multiple layers (up few cm) fused granular...
Abstract Prevention of microbially induced corrosion (MIC) is great significance in many environmental applications. Here, we report the use an ultra-thin, graphene skin (Gr) as a superior anti-MIC coating over two commercial polymeric coatings, Parylene-C (PA) and Polyurethane (PU). We find that Nickel (Ni) dissolution cell with Gr-coated Ni order magnitude lower than PA PU coated electrodes. Electrochemical analysis reveals Gr offers ~10 ~100 fold improvement MIC resistance coatings...
A series of nanocomposites were prepared from graphene platelets (GPL) and a flexible biobased epoxy thermoset matrix derived cashew nut shell liquid. The loading GPL in the ranged 0.1 to 0.8 wt % resulted increased tensile strength Young's modulus (17 33 MPa 474 1700 MPa, respectively). Increases mode I fracture toughness for KIC GIC 0.6 1.9 MPa·m1/2 906 1734 J/m2, respectively. Furthermore, dynamic mechanical analysis revealed that incorporation increases α-transition temperature (peak...
Ring-opening metathesis polymerization (ROMP) produced homopolymers and copolymers of 5-ethylidene-2-norbornene (ENB) 5-methanol-2-norbornene (NBOH), this provided a platform to explore the influence monomer polarity noncovalent interactions on mechanical high velocity impact performance. The tensile yield, mode-I fracture, behavior displayed strong dependence hydroxyl-containing NBOH content when compounding effects (such as degree undercooling polymer topology) are considered....
The construction of ballistic-resistant body armor is experiencing an increasing use flexible unidirectional (UD) composite laminates that comprise multiple layers. Each UD layer contains hexagonally packed high-performance fibers with a very low modulus matrix (sometimes referred to as binder resins). Laminates are then made from orthogonal stacks these layers, and laminate-based packages offer significant performance advantages over standard woven materials. When designing any system, the...
By introducing a monofunctional epoxy compound in epoxy-amine structural adhesives, series of polymer glasses are studied which systematically varies the apparent molecular weight between crosslinks (Mc,a) from 500 to 1800 g/mol while maintaining glass transition temperature (Tg) above 110 °C. Young's modulus and yield strength, measured uniaxial tension, increased with increasing Mc,a breaking common trends highly crosslinked polymers. Positron annihilation spectroscopy elucidated local...
Modern design of common adhesives, composites and polymeric parts makes use polymer glasses that are stiff enough to maintain their shape under a high stress while still having ductile behavior after the yield point. Typically, material compositions tuned with co-monomers, blends, plasticizers, or other additives arrive at tradeoff between elastic modulus toughness. In contrast, strong changes mechanics glass possible by changing only molecular packing during vitrification even deep in...
Carbon nanotube (CNT) grafted glass fiber reinforced epoxy nanocomposites (GFRP) present a range of stiffnesses (MPa to GPa) and length scales (μm nm) at the fiber–matrix interface. The contribution functionalized CNT networks local bulk polymer dynamics is studied here by using combination torsion dynamical mechanical thermal analysis (DMTA), positron annihilation lifetime spectroscopy (PALS), neutron scattering (NS) measurements. DMTA measurements highlight reduction in storage modulus...
Polymer nanocomposites containing self-assembled cellulose nanocrystals (CNCs) are ideal for advanced applications requiring both strength and toughness as the helicoidal structure of CNCs deflects crack propagation polymer matrix dissipates impact energy. However, any adsorbed water layer surrounding may compromise interfacial adhesion between CNCs, thus impacting stress transfer at that interface. Therefore, it is critical to study role interface in connecting dynamics resulting mechanical...
We report galvanic deposition of Mo films onto 6061 Al alloy from aqueous solutions containing 1 mM HNO3 and 10 MoCl5. Deposition for 40 min. yields an 9 μm thick film, which also contains 18 atom% Al. The corrosion resistance the film is studied by voltammetry electrochemical impedance spectroscopy in 0.5 M H2SO4 3.5 wt% NaCl electrolyte at pH 2, 7 12. These demonstrate that significantly improves underlying substrate. Galvanic appears to yield elemental, amorphous films.
ABSTRACT The incorporation of carbon nanofiber (CNF) into glass fiber (GF) composites is a potential route to extend polymer composite service‐life and enhance mechanical properties. Under nonstatic conditions, only limited information concerning water uptake contaminant release properties nanocomposite materials currently available. Polyester containing GF oxidized CNF were immersed in for 30 days under nominal pressure at 23 °C, below the polymer's glass‐transition temperature. Water was...
Many body armor designs incorporate unidirectional (UD) laminates. UD laminates are constructed of thin (<0.05 mm) layers high-performance yarns, where the yarns in each layer oriented parallel to other and held place using binder resins polymer films. The is by stacking different orientations. To date, only very preliminary work has been performed characterize ageing used effects on their performance. For example, during development conditioning protocol National Institute Justice...