A5023860499- Block Copolymer Self-Assembly
- Advanced Polymer Synthesis and Characterization
- Catalysis and Oxidation Reactions
- Advanced Battery Materials and Technologies
- Photonic Crystals and Applications
- Oxidative Organic Chemistry Reactions
- X-ray Diffraction in Crystallography
- Synthesis and properties of polymers
- Innovative Microfluidic and Catalytic Techniques Innovation
- Mesoporous Materials and Catalysis
- Crystallization and Solubility Studies
- Supercapacitor Materials and Fabrication
- Copper Interconnects and Reliability
- Nanotechnology research and applications
- Chemical and Physical Properties of Materials
- 2D Materials and Applications
- Advancements in Battery Materials
- Electronic and Structural Properties of Oxides
- Catalysts for Methane Reforming
- Radical Photochemical Reactions
- Micro and Nano Robotics
- Phosphorus compounds and reactions
- Pickering emulsions and particle stabilization
- Thermal properties of materials
- Graphene research and applications
Cornell University
2019-2025
Ithaca College
2021
The University of Texas at Austin
2014-2016
The temperature required to induce cross-linking in typical benzocyclobutene-based thermosets is near 250 °C, which exceeds the use of many chemical components. A new and versatile synthesis BCB-functionalized monomers has allowed access that can be incorporated into a variety macromolecular platforms enable significantly reduced cure temperatures. Incorporation comonomers polystyrene polynorbornene enabled insolublization thin films by curing at only 120 °C for 1 h.
Three-dimensional (3D) periodic ordering of silicon (Si), an inorganic semiconductor, on the mesoscale was achieved by combining block copolymer (BCP) self-assembly (SA) based mesoporous alternating gyroidal network formation with nonequilibrium transient laser heating. 3D continuous and periodically ordered carbon thin-film networks were prepared from spin coating, SA under solvent vapor annealing (SVA), thermal processing mixtures a triblock terpolymer resorcinol resols. The resulting thin...
A flow protocol for the generation of phthaloyl peroxide has been developed. This process directly yields in high purity (>95%) and can be used to bypass need isolate recrystallize peroxide, improving upon earlier batch procedures. The formation combined with arene hydroxylation reactions provides a method consumption as it is generated minimize accumulation large quantities peroxide.
Properties arising from ordered periodic mesostructures are often obscured by small, randomly oriented domains and grain boundaries. Bulk macroscopic single crystals with mesoscale periodicity needed to establish fundamental structure-property correlations for materials at this length scale (10-100 nm). A solvent-evaporation-induced crystallization method providing access large (millimeter centimeter) single-crystal mesostructures, specifically bicontinuous gyroids, in thick films (>100 µm)...
Porous materials design often faces a trade-off between the requirements of high internal surface area and reagent flux. Inorganic with asymmetric/hierarchical pore structures or well-defined mesopores have been tested to overcome this trade-off, but success has remained limited when strategies are employed individually. Here, attributes both combined scalable path porous titanium nitride (TiN) carbon membranes that conducting (TiN, carbon) superconducting is demonstrated. These exhibit...
Abstract Art and materials innovation have always been intertwined, dating back to the earliest human creations. In modern times, however, increasing specialization of science often restricts artists' access cutting‐edge materials. Here, aspects an art‐science collaboration between artist Kimsooja Wiesner Lab at Cornell University, are detailed. The project involves development a custom‐made iridescent block copolymer coating by means self‐assembly, originally applied transparent window...
A new oxidative dearomatization reaction has been developed using phthaloyl peroxide to chemoselectively install two oxygen–carbon bonds into aromatic precursors. The oxidation proceeds only once; addition of superstoichiometric equivalents does not react further with the newly generated 1,3-cyclohexadiene. challenged by different functional groups and shown maintain chemoselectivity. Due broad reactivity 1,2-methylenedioxybenzene derivatives, linear free energy correlations were determined...
Abstract Mesoscale order can lead to emergent properties including phononic bandgaps or topologically protected states. Block copolymers offer a route mesoscale periodic architectures, but their use as structure directing agents for metallic materials has not been fully realized. A versatile approach mesostructured metals via bulk block copolymer self‐assembly derived ceramic templates, is demonstrated. Molten indium infiltrated into mesoporous, double gyroidal silicon nitride templates...
Block copolymer (BCP)-derived asymmetric ultrafiltration membranes combine the BCP self-assembly with nonsolvent-induced phase separation (SNIPS). To understand structural evolution in membrane top layers made from polyisoprene-b-polystyrene-b-poly(4-vinylpyridine) (ISV) dioxane (DOX) and tetrahydrofuran (THF) all way to final membrane, we combined solution small-angle X-ray scattering (SAXS), estimated concentrations compositions upon solvent evaporation, situ grazing-incidence SAXS...
Progress on two design approaches to patternable, low k dielectrics is described. These formulations are both print in negative tone and based polyhedral silsesquioxanes bearing benzocyclobutene moieties. The patternability was demonstrated materials have dielectric constants between 2.00–2.22 at optical frequencies. Coefficients of thermal expansion the plane were found be 6.0–13 ppm/K, reduced moduli 4–4.6 GPa.
A discovery-based Grignard experiment that emphasizes several important concepts in organic chemistry is reported. The reagent from 1-bromo-4-chlorobenzene was prepared and reacted with dimethylformamide (DMF) to synthesize 4-chlorobenzaldehyde. Students were tasked predicting halogen reactivity the formation of reagent, final product, drawing a reasonable mechanism for reaction DMF. tertiary amides typically not discussed curriculum, so students have an opportunity apply covered lecture new...
Recent developments in quantum materials hold promise for revolutionizing energy and information technologies. The use of soft matter self-assembly, example, by employing block copolymers (BCPs) as structure directing or templating agents, offers facile pathways toward metamaterials with highly tunable mesostructures via scalable solution processing. Here, we report the preparation patternable mesoporous niobium carbonitride-type thin film superconductors through spin-coating a hybrid...
Abstract Recent advances in the photocatalytic activation of dry reforming methane (DRM: CO 2 + CH 4 → 2CO 2H ) at low temperature and ambient pressure have generated considerable interest as a promising route to convert greenhouse gases into valuable synthetic gas (syngas). While detailed studies revealed mechanisms involved DRM metal-semiconductor interfaces, less attention has been devoted how high surface area semiconductor supports may enhance such conversions. Here we structure...
Solution-based soft matter self-assembly (SA) promises unique materials properties from approaches including additive manufacturing/three-dimensional (3D) printing. We report direct ink writing derived, hierarchically porous transition metal nitride superconductors (SCs) and precursor oxides, structure-directed by Pluronics-family block copolymer (BCP) SA heat treated in various environments. SCs with periodic lattices on three length scales show record nanoconfinement-induced upper critical...
Carbon materials have found ubiquitous use in the fields of electrochemical energy storage (EES) and conversion, due to their electrical thermal transport properties, typically high specific surface areas, low densities, stability a variety systems. As demand particular for increasingly efficient EES devices grows, three-dimensionally (3D) continuous nanostructured electrode gained interest, as they present pathway interfacial areas between electrodes while overall device has areal...
Self-assembled block copolymer (BCP) thin films and their nanocomposites provide nanostructures useful in myriad applications. While conventional characterization techniques an understanding of film surface internal structures, optical super-resolution microscopy (OSRM) has recently emerged as alternative way to characterize nanoscopic polymer morphology. This work describes self-assembled poly(isoprene)-block-poly(styrene)-block-poly(N,N-dimethylaminoethyl methacrylate) (PI-b-PS-b-PDMAEMA...
Abstract Phthaloyl peroxide can be cleanly generated from phthaloyl chloride and sodium carbonate under continuous flow conditions.
Soft-Matter Quantum Materials In article number 2203908, Ulrich Wiesner and co-workers describe the academic technological promise associated with soft-matter-directed quantum materials. This is achieved by reviewing existing studies as well providing future perspectives on various classes of materials, particular focus effects soft-matter self-assembly-directed mesoscale structure properties.
In article number 2100469, Ulrich Wiesner and co-workers create quantum metamaterials in the form of double-gyroid structured indium metal superconductors via soft matter self-assembly. High pressure infiltration molten into a block copolymer structure directed ceramic template transfers polymer derived architecture ceramic/indium composite with high fidelity. The resulting mesoscale is shown to dictate electronic behavior modification fundamental, level characteristics.