A5068997308- Advanced Battery Materials and Technologies
- Advancements in Battery Materials
- Conducting polymers and applications
- Ionic liquids properties and applications
- Fuel Cells and Related Materials
- Advanced Battery Technologies Research
- Advanced battery technologies research
- Dendrimers and Hyperbranched Polymers
- Synthesis and properties of polymers
- Advanced NMR Techniques and Applications
- Covalent Organic Framework Applications
- Supercapacitor Materials and Fabrication
- Advanced Polymer Synthesis and Characterization
- Liquid Crystal Research Advancements
- DNA and Nucleic Acid Chemistry
- Supramolecular Chemistry and Complexes
- NMR spectroscopy and applications
- Synthesis and Properties of Aromatic Compounds
- Advanced Materials and Mechanics
- Hydrogels: synthesis, properties, applications
- Advanced MRI Techniques and Applications
Virginia Tech
2019-2023
The ubiquitous biomacromolecule DNA has an axial rigidity persistence length of ~50 nm, driven by its elegant double helical structure. While and multiple helix structures appear widely in nature, only rarely are these found synthetic non-chiral macromolecules. Here we describe a conformation the densely charged aromatic polyamide poly(2,2'-disulfonyl-4,4'-benzidine terephthalamide) or PBDT. This macromolecule represents one most rigid simple molecular known, exhibiting extremely high (~1...
Abstract Molecular ionic composites (MICs), made from liquids and a rigid‐rod polymer poly(2,2′‐disulfonyl‐4,4′‐benzidine terephthalamide) (PBDT), are new type of rigid gel electrolyte that combine fast ion transport with high thermal stability mechanical strength. In this work, MIC membrane is prepared composed PBDT, lithium bis(trifluoromethylsulfonyl)imide (LiTFSI), 1‐butyl‐1‐methylpyrrolidinium (Pyr 14 TFSI) in mass ratio 10:10:80. The conductivity at 25 ° C 0.56 mS cm −1 no added...
Polymer electrolytes show promise as alternatives to conventional in energy storage and conversion devices but have been limited due their inverse correlation between ionic conductivity modulus. In this study, we examine surface morphology, linear viscoelastic, dielectric diffusive properties of molecular composites (MICs), materials produced through the combination a rigid charged double helical polymer, poly(2,2′-disulfonyl-4,4′-benzidine terephthalamide) (PBDT), liquids (ILs). To probe...
Abstract Benchtop nuclear magnetic resonance (NMR) spectrometers are being employed in a wide variety of applications from undergraduate teaching and research academia to quality control process monitoring industrial settings. Incorporating benchtop NMR some these presents opportunities for new practical uses the technology challenges that truly test capabilities compact spectrometers. For instance, use protonated solvents manufacturing or requires separating quantitating analyte signals...
Six molecular ionic composite electrolyte films were produced by combining a rigid-rod polyelectrolyte and various liquids. These electrolytes exhibit both higher modulus room temperature conductivity than other polymer-based electrolytes.
Solid-state electrolytes are attractive for use in electrochemical devices because they remove the need a flammable liquid electrolyte while contributing to structural integrity of device. We have recently developed class solid electrolytes, termed molecular ionic composites (MICs), composed liquids (ILs) and rigid-rod polyelectrolyte, poly(2,2′-disulfonyl-4,4′-benzidine terephthalamide) (PBDT). MIC materials, originally obtained through an ion-exchange process between IL PBDT aqueous...
Single-ion-conducting electrolytes enable easy processing and can block Li dendritic growth, showing potential for use in solid-state batteries. We report solid that combine a rigid-rod polyanion, poly(2,2′-disulfonyl-4,4′-benzidine terephthalamide) (PBDT), with Na+ or Li+ counterions, poly(ethylene glycol) (PEG, Mn = 400 g mol–1). PBDT-PEG membranes show Young's modulus from 90 to 2110 MPa increases the PBDT content is >4× higher Li-based vs Na-based electrolytes. attribute this...
Organic ionic plastic crystals (OIPCs) appear as promising materials to replace traditional liquid electrolytes, especially for use in solid-state batteries. However, OIPCs show low conductive properties relative which presents an obstacle their widespread applications. Recent studies revealed very high ion mobility the solid phases of OIPCs; yet, conductivity is significantly (∼100 times) suppressed because strong ion–ion correlations. To understand origin correlations OIPCs, we employed...
We report irreversible, shear-activated gelation in liquid crystalline solutions of a rigid polyelectrolyte that forms rodlike assemblies (rods) salt-free solution. At rest, the are kinetically stable against and exhibit low viscosities. Under steady shear at, or above, critical rate, physically cross-linked, nematic gel network due to linear growth branching rods. Above time scale can be tuned from hours nearly instantaneously by varying rate solution concentration. The gels distinct their...
Molecular ionic composites (MICs) are a new class of solid electrolyte materials developed recently in our group. These constructed from various liquids and highly charged rigid rodlike polymer, poly(2,2′-disulfonyl-4,4′-benzideneterephthalamide) (PBDT). MICs demonstrate an unprecedented combination thermal properties (stability up to 300 °C), mechanical ( E′ ~ 1 GPa), ion transport (ionic conductivity 8 mS/cm). [1-3] Here we present preparation characterization MIC membrane based on the...