Interpretation of hydrogen bonding formation through thermodynamic, spectroscopic and DFT studies between isoamyl alcohol and benzyl alcohol at T = (293.15 to 318.15) K

1H, 31P NMR, Raman and FTIR spectroscopies for investigating phosphoric acid dissociation to understand phosphate ion kinetics in body fluids

The study investigates the formation and transportation of ionic charge carriers in phosphoric acid-water system. This investigation encompasses an analysis of 1H and 31P NMR chemical shifts, self-diffusion coefficients, spin-lattice relaxation rates, spin-spin relaxation rates, activation energies, dissociation constants, electrical conductivity, and Raman shifts, along with FTIR spectra across various water concentrations. Significantly, the maxima observed in these curves at around 0.8 water molar fraction predominantly from the unique molecular arrangement between phosphoric acid and water molecules, influenced by a hydrogen bonding network. These findings yield valuable insights into phosphate ion kinetics within body fluids, covering essential aspects like hydrogen bonding networks, ionization processes, and the energy kinetics of phosphoric dissociation. A customized semiempirical model is applied to calculate dissociated species (water, phosphoric acid, and hydronium ion) at different water contents within a wide range of water mole fraction. Furthermore, this investigation extends to the dissociation of phosphoric acid in DMEM cell culture media, offering a more precise model for phosphate ionic kinetics within body fluids, especially at nominal phosphate concentrations of approximately 1:700μL.

Microphase Separation Engineering toward 3D Porous Carbon Assembled from Nanosheets for Flexible All-Solid-State Supercapacitors

Although hierarchitectures could energize carbon materials to address the challenges encountered in emerging flexible energy storage, how to make the trade-offs among specific surface area, pore configuration, and conductivity is still a lingering issue. Herein, 3D porous carbon assembled by nanosheets (HCAs) with tunable hierarchical porous structure is acquired from amphiphilic coal tar pitch and chitosan by means of a facile microphase separation strategy without any templates. The polar molecular chains of chitosan and the surrounding pitch molecules with strong π-π* bonds self-assemble respectively to form hierarchical pores and a network of nanosheets in a stepped pyrolysis process. Due to the combined effects of the meso-dominant porous structure, high specific surface area, and nitrogen-rich nature, the as-assembled symmetric all-solid-state supercapacitor with a wide voltage range of 0-1.8 V delivers a specific capacitance of 296 F g^-1 at 0.2 A g^-1 and an energy density of 27 Wh kg^-1 at a power density of 450 W kg^-1. The strategy of microphase separation is proposed originally to design and to fabricate carbon materials with multilevel nanoarchitectural trade-offs for high-performance supercapacitors.