A5051054350- Block Copolymer Self-Assembly
- Advancements in Battery Materials
- Advanced Battery Materials and Technologies
- Membrane-based Ion Separation Techniques
- Extraction and Separation Processes
- Membrane Separation Technologies
- Advanced Polymer Synthesis and Characterization
- Electrohydrodynamics and Fluid Dynamics
- Theoretical and Computational Physics
- Characterization and Applications of Magnetic Nanoparticles
- Liquid Crystal Research Advancements
- Polymer Surface Interaction Studies
- Advanced Battery Technologies Research
- Membrane Separation and Gas Transport
- Nanopore and Nanochannel Transport Studies
- Machine Learning in Materials Science
- Nanofabrication and Lithography Techniques
- Chemical Synthesis and Characterization
- Advanced Materials and Mechanics
- Advancements in Photolithography Techniques
- Pickering emulsions and particle stabilization
- Ion-surface interactions and analysis
- Fuel Cells and Related Materials
- Radioactive element chemistry and processing
- Nanomaterials for catalytic reactions
University of Technology Sydney
2021-2024
Lawrence Berkeley National Laboratory
2020-2022
Argonne National Laboratory
2005-2022
Yale University
2013-2020
University of New Haven
2017
We demonstrate the fabrication of a loose, negatively charged nanofiltration (NF) membrane with tailored selectivity for removal perfluoroalkyl substances reduced scaling potential. A selective polyamide layer was fabricated on top poly(ether sulfone) support via interfacial polymerization trimesoyl chloride and mixture piperazine bipiperidine. Incorporating high molecular weight bipiperidine during enables formation nanoporous structure. The NF possessed negative surface charge had pore...
There is long-standing interest in developing membranes possessing uniform pores with dimensions the range of 1 nm and physical continuity macroscopic transport direction to meet needs challenging small molecule ionic separations. Here we report facile, scalabe fabrication polymer vertically (i.e., along through-plane direction) aligned by magnetic-field alignment subsequent cross-linking a liquid crystalline mesophase. We utilize wedge-shaped amphiphilic species as building block...
The graft-through synthesis of Janus graft block copolymers (GBCPs) from branched macromonomers composed various combinations homopolymers is presented. Self-assembly GBCPs resulted in ordered nanostructures with ultra-small domain sizes down to 2.8 nm (half-pitch). grafted architecture introduces an additional parameter, the backbone length, which enables control over thermomechanical properties and processability independently their self-assembled nanostructures. simple synthetic route...
A scalable approach for developing large area polymer films, with stimuli responsive vertically aligned nanopores is reported. Magnetic fields are used to create highly hexagonally packed block copolymer cylindrical microdomains order parameters exceeding 0.95. Selective etch removal of material yields nanoporous films which demonstrate reversible pore closure on heating. As a service our authors and readers, this journal provides supporting information supplied by the authors. Such...
We report the successful synthesis of previously inaccessible poly(3-hydroxystyrene)-block-poly(dimethylsiloxane) (P3HS-b-PDMS) block copolymers (BCPs) with varying volume fractions, molecular weights, and narrow dispersities by sequential living anionic polymerization. The chemical structure weight were fully characterized 1H NMR gel permeation chromatography. BCP phase behavior was investigated using small-angle X-ray scattering (SAXS) transmission electron microscopy. Temperature-resolved...
An ethanol-based Pickering emulsion that spontaneously forms conductive composites is used to sustainably manufacture compliant strain sensors.
Polymer electrolytes mitigate safety concerns surrounding flammable liquid in lithium-ion batteries. Poly(ethylene oxide) (PEO) demonstrate viable conductivity values (∼1 × 10–3 S/cm) at elevated temperatures (>70 °C) but a relatively low Li+ current fraction (≤0.2) because strong coordination inhibits cation mobility. We have developed series of polyacetal by systematically varying methylene oxide (MO) and ethylene (EO) units the polymer backbone. These materials maintain high...
We present results of temperature resolved scattering studies a liquid crystalline block copolymer undergoing an order-disorder transition (ODT) in the presence magnetic fields and time-resolved measurements during isothermal field annealing at sub-ODT temperatures. In each case, interactions produced strongly textured mesophases with cylindrical microdomains aligned parallel to field. find there is no measurable field-induced shift ODT ($T_{ODT}$) which suggests that selective melting does...
A series of poly(4-tert-butylstyrene-block-2-vinylpyridine) [P(tBuSt-b-2VP)] block copolymers (BCPs) with varying volume fractions, molecular weights, and narrow dispersities were synthesized from the commercially available monomers by sequential living anionic polymerization. The thoroughly characterized 1H NMR spectroscopy, size exclusion chromatography, thermal gravimetric analysis, differential scanning calorimetry (DSC). To examine effect tert-butyl group on effective interaction...
We report on the development of a liquid crystalline block copolymer with brush-type architecture as platform for creating functional materials by magnetic-field-directed self-assembly. Ring-opening metathesis n-alkyloxy cyanobiphenyl and polylactide (PLA) functionalized norbornene monomers provides efficient polymerization yielding low polydispersity copolymers. The mesogenic species, spacer length, monomer functionality, brush-chain overall molecular weight were chosen optimized to produce...
Significance Magnetic field interactions with condensed matter can produce orientationally ordered states that are important for fundamental research and technological applications. Block copolymer (BCP) mesophases typically exhibit weak coupling, requiring high-intensity fields generated by superconducting magnets to such states. This work advances a strategy circumventing intensity limitations creates highly aligned using an order of magnitude smaller than required be produced simple...
We explore the morphology and phase behavior of a recently introduced architecture liquid crystalline brushlike block copolymer (LCBBC) as functions composition molecular weight. Low-polydispersity materials were prepared by ring-opening metathesis polymerization n-alkyloxycyanobiphenyl poly(dl-lactide) (PLA) functionalized norbornene monomers. Well-ordered mesophases observed with transitions from spheres to hexagonally packed cylinders, lamellae, inverse on increasing weight fraction...
Polyacetal electrolytes have been demonstrated as promising alternatives to liquid and poly(ethylene oxide) (PEO) for rechargeable lithium-ion batteries; however, the relationship between polymer structure ion motion is difficult characterize. Here, we study structure–property trends in diffusion with respect composition a systematic series of five polyacetals varying ratios ethylene oxide (EO) methylene (MO) units, denoted P(xEO-yMO), PEO. We first use 7Li 19F pulsed-field-gradient NMR...
Graphene oxide (GO) nanosheets were utilized as a selective layer on highly porous polyvinyl alcohol (PVA) nanofiber support via pressure-assisted self-assembly technique to synthesize composite nanofiltration membranes. The GO was rendered stable by cross-linking the (GO-to-GO) and linking them onto surface (GO-to-PVA) using glutaraldehyde (GA). amounts of GA deposited PVA substrate varied determine optimum membrane both in terms water flux salt rejection performances. successful...
Rare earth elements (REEs) have become a strategic resource extensively used in renewable energy technologies and modern electronic devices. Depletion of natural REE-bearing mineral deposits has made selective recovery REEs from alternative sources crucial meeting the rising global demand. A chromium-based metal–organic framework was synthesized modified with N-(phosphonomethyl)iminodiacetic acid (PMIDA) this study to selectively recover (europium, Eu) chemically complex zinc ore leachate....