A5075453200- Force Microscopy Techniques and Applications
- 2D Materials and Applications
- Adhesion, Friction, and Surface Interactions
- Graphene research and applications
- Multiferroics and related materials
- Analytical Chemistry and Sensors
- Polymer crystallization and properties
- Perovskite Materials and Applications
- Electronic and Structural Properties of Oxides
- Ferroelectric and Piezoelectric Materials
- Rheology and Fluid Dynamics Studies
- MXene and MAX Phase Materials
- Mechanical and Optical Resonators
- Nanofabrication and Lithography Techniques
- Ga2O3 and related materials
- Carbon Nanotubes in Composites
- Advanced Chemical Sensor Technologies
- Silicone and Siloxane Chemistry
- Neurobiology and Insect Physiology Research
- Ocular Surface and Contact Lens
- Polymer Surface Interaction Studies
- Cellular Mechanics and Interactions
- Advanced Sensor and Energy Harvesting Materials
- Quantum Dots Synthesis And Properties
- Magnetic properties of thin films
Dow Chemical (South Korea)
2025
Dow Chemical (United States)
2018-2023
Oak Ridge National Laboratory
2016-2020
Georgia Institute of Technology
2014-2016
National Academy of Sciences of Ukraine
2016
Frantsevich Institute for Problems in Materials Science
2016
Institute of Physics
2016
Clemson University
2011
In this Feature Article, we discussed the experimental and modeling methods analyzed limitations of surface probing nanomechanical properties polymeric biological materials in static dynamic regimes with atomic force microscopy (AFM), which are widely utilized currently. To facilitate such measurements minimized ambiguities, study present a combined method to evaluate viscoelastic compliant materials. We collected force-distance data regime for benchmark polymer material (poly(n-butyl...
Abstract Polar van der Waals chalcogenophosphates exhibit unique properties, such as negative electrostriction and multi-well ferrielectricity, enable combining dielectric 2D electronic materials. Using low temperature piezoresponse force microscopy, we revealed coexistence of piezoelectric non-piezoelectric phases in CuInP 2 Se 6 , forming unusual domain walls with enhanced response. From systematic imaging experiments have inferred the formation a partially polarized antiferroelectric...
Research in the rapidly developing field of 2D electronic materials has thus far been focused on metallic and semiconducting materials. However, complementary dielectric such as nonlinear dielectrics are needed to enable realistic device architectures. Candidate require tunable properties pathways for heterostructure assembly. Here we report a family cation-deficient transition metal thiophosphates whose unique chemistry makes them viable prospect these applications. In materials, naturally...
We report on polarization switching properties of thin flakes van der Waals ferrielectric CuInP2S6. observe mesoscale domains, ferroelectric switching, and the Curie temperature above 299 K down to a thickness ∼50 nm. However, electromechanical response is progressively suppressed below 50 nm, vanishes at room ∼10 Though larger than single layer, 10 nm still very small value compared expectations for an intrinsic semiconductor. therefore propose model doped surface layer that screens...
We report continuous monitoring of heterogeneously distributed oxygenated functionalities on the entire surface individual graphene oxide flake during chemical reduction process. The charge densities over with mixed oxidized and graphitic domains were observed for same after a step-by-step process using electrostatic force microscopy. Quantitative analysis revealed heavily nanoscale (50–100 nm across) complex mechanism involving leaching sharp asperities from followed by gradual thinning...
Single crystals of the van der Waals layered ferrielectric material CuInP2S6 spontaneously phase separate when synthesized with Cu deficiency. Here we identify a route to form and tune intralayer heterostructures between corresponding (CuInP2S6) paraelectric (In4/3P2S6) phases through control chemical separation. We conclusively demonstrate that Cu-deficient Cu1-xIn1+x/3P2S6 forms single at high temperature. also mechanism by which separation proceeds upon cooling. Above 500 K both Cu+ In3+...
The metatarsal lyriform organ of the Central American wandering spider Cupiennius salei is its most sensitive vibration detector. It able to sense a wide range stimuli over four orders magnitude in frequency between at least as low 0.1 Hz and several kilohertz. Transmission vibrations slit controlled by cuticular pad front it. While mechanism high-frequency stimulus transfer (above ca 40 Hz) well understood related viscoelastic properties pad's epicuticle, it not yet clear how low-frequency...
Probing of micro- and nanoscale mechanical properties soft materials with atomic force microscopy (AFM) gives essential information about the performance nanostructured polymer systems, natural nanocomposites, ultrathin coatings, cell functioning. AFM provides efficient is some cases exclusive way to study these nondestructively in controlled environment. Precise control methods allows its application variety can be used go beyond elastic examine temperature rate dependent response. In this...
<div class="section abstract"><div class="htmlview paragraph">In the automotive industry, it is essential to consider not only how well specialty materials perform and are formulated, but also efficiently economically they can be applied during manufacturing. This becomes especially important early stages of development prevent issues when these used in new designs by suppliers or manufacturers.</div><div paragraph">With rapid growth electric vehicles (EVs), being...
The flow-induced crystallization of polymers is a ubiquitous aspect processing where the effect flow can dramatically alter end-use properties polymers. Here, we will describe development new methodology whereby on kinetics in polyethylene be determined after has occurred. This first illustration for rapidly crystallizing polyethylene, which required different approach than what been done other materials. Critically, this necessitated an understanding self-nucleation and melt memory behavior...
Silicone–organic interpenetrating polymer networks (IPNs) are hybrid materials with enhanced mechanical properties relative to pure silicones. Here, we compare structure–property relationships of graft-IPNs polydimethylsiloxane (PDMS) made methyl methacrylate (MMA) and isobornyl (IBoMA). We found evidence for increased polymer–polymer mixing in the PDMS/PIBoMA graft-IPNs, which was impacted by higher compatibility these two polymers compared PDMS/PMMA. These possessed fracture toughness...
The ability to control thin-film growth has led advances in our understanding of fundamental physics as well the emergence novel technologies. However, common techniques introduce a number limitations related concentration defects on film interfaces and surfaces that limit scope systems can be produced studied experimentally. Here, we developed an ion-beam based subtractive fabrication process enables creation modification thin films with pre-defined thicknesses. To accomplish this...
Abstract An effective method for tuning fluorescent response of an ultrathin (5 nm) polymer film, which can be used generation sensing arrays, is reported. This distinctive in that the modification optical achieved with grafting a non‐fluorescent to film. Using this approach, number films demonstrating different emission when exposed solvent vapors were synthesized.
Abstract Multi-material systems interfaced with 2D materials, or entirely new 3D heterostructures can lead to the next generation multi-functional device architectures. Physical and chemical control at nanoscale is also necessary tailor these materials as functional structures approach physical limit. transition metal thiophosphates (TPS), a general formulae Cu 1−x In 1+x/3 P 2 S 6, have shown ferroelectric polarization behavior T c above room temperature, making them attractive candidates...
A computational and experimental framework for quantifying flow-enhanced nucleation (FEN) in polymers is presented demonstrated an industrial-grade linear low-density polyethylene (LLDPE). Experimentally, kinetic measurements of isothermal crystallization were performed by using fast-scanning calorimetry (FSC) melts that presheared at various strain rates. The effect shear on the average conformation tensor melt was modeled with discrete slip-link model (DSM). then related to acceleration...
Journal Article Nanofabrication Limits in Layered Ferroelectric Semiconductors via He-ion Beam Get access Holland Hysmith, Hysmith Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Ridge, TN 37831 Search other works by this author on: Oxford Academic Google Scholar Alex Belianinov, Belianinov 37831The Institute Functional Imaging of Materials, Matthew J Burch, Burch Anton V Ievlev, Ievlev Vighter Iberi, Iberi 37831Department Science and Engineering, University...
Journal Article Correlative Mapping with AFM, STEM HAADF, and PF-QNM/SROM of Interpenetrating Networks Elastomeric Glassy Polymers Get access Alyssa J Fielitz, Fielitz Core Research & Development, The Dow Chemical Company, Midland, MI, United States Corresponding author: ajmckenna@dow.com Search for other works by this author on: Oxford Academic Google Scholar Jeremy M Beebe, Beebe Dongchan Ahn, Ahn Consumer Solutions, Marius Chyasnavichyus, Chyasnavichyus Tyler R Heyl, Heyl Department...