A5051500789- Block Copolymer Self-Assembly
- Advanced Battery Materials and Technologies
- Fuel Cells and Related Materials
- Rheology and Fluid Dynamics Studies
- Conducting polymers and applications
- Advancements in Battery Materials
- Fluid Dynamics and Thin Films
- Advanced Polymer Synthesis and Characterization
- Force Microscopy Techniques and Applications
- Nuclear Physics and Applications
- Thermal and Kinetic Analysis
- Quantum Dots Synthesis And Properties
- Nanofabrication and Lithography Techniques
- Metallurgical Processes and Thermodynamics
- Gold and Silver Nanoparticles Synthesis and Applications
- Ion-surface interactions and analysis
- Molecular Junctions and Nanostructures
- Electron and X-Ray Spectroscopy Techniques
University of Delaware
2014-2018
NIST Center for Neutron Research
2016
National Institute of Standards and Technology
2016
University of Virginia
2013
X-ray photoelectron spectroscopy (XPS) depth profiling with C60(+) sputtering was used to resolve the lithium-ion distribution in nanometer-scale domain structures of block polymer electrolyte thin films. The electrolytes interest are mixtures lithium trifluoromethanesulfonate and lamellar-forming polystyrene-poly(oligo(oxyethylene)methacrylate) (PS-POEM) copolymer. XPS results showed that concentration directly correlated POEM concentration. Furthermore, chemical state atomic composition...
Block polymer (BP) electrolytes offer significant advantages relative to existing liquid or due their independently tunable ion transport and mechanical stability properties as a result of nanoscale self-assembly. Many these nanostructured are composed BP that is doped with lithium salt impart conductivity but which also alters the self-assembly (structure thermodynamics) in comparison neat BP. By elucidating effects concentration counterion chemistry on relevant density distributions, more...
We report a highly predictive approach to capturing the major substrate–polymer interactions that can dominate nanoscale ordering and orientation in block polymer (BP) thin films. Our allows one create designer BP films on modified substrates while minimizing need for extensive parameter space exploration. Herein, we systematically quantitatively examined influence of substrate surface energy components (dispersive polar interactions) film self-assembly, our analysis demonstrates although...
Classical nucleation theory and Derjaguin, Landau, Verwey, Overbeek (DLVO) for colloidal stability were applied to gain insight into the synthesis of dodecanethiol (DDT) functionalized silver nanoparticles (NPs) by reduction nitrate with sodium borohydride in ethanol. This analysis indicated importance quickly establishing a dense DDT ligand brush on inherently unstable primary particles achieve stability. The DLVO calculations also that electrostatic potential was minor contributor...
Herein, we employed in situ small-angle neutron scattering (SANS) and reflectivity (NR) to elucidate the importance of polymer–solvent interactions on morphology development during solvent vapor annealing (SVA) block polymer (BP) thin films. Judicious choice nanostructure orientation (parallel substrate) permitted measurement preferential segregation (d6-benzene) into our cylinder-forming poly(styrene-b-isoprene-b-styrene) (SIS) A distinguishing feature this work is simultaneous tracking...
We isolated the key substrate–polymer interactions responsible for propagation of substrate surface field effects in block polymer (BP) thin films through a modified approach to Owens and Wendt interfacial energy formalism. This modification captured influence long-range components on through-film nanostructure orientation BP films, it provides framework manipulating film behavior without need extensive parameter space exploration. Optical microscopy (OM) gradient thickness...
We employed small-angle neutron scattering (SANS) to identify the kinetic pathways between disordered and ordered states in block polymer (BP) thin films subjected solvent vapor annealing with soft shear (SVA-SS), which enabled optimization of large-scale nanostructure ordering alignment. The judicious incorporation deuteration poly(deuterated styrene-b-isoprene-b-deuterated styrene) (dSIdS) (≈200 nm thick) provided sufficient contrast SANS experiments overcome diffuse contribution from...