Intramolecular hydrogen-bonding effects on O H stretch overtone excitation for fluorinated hydroperoxides

Mostafavi, Mojdeh; Tucker, Asya L.; Hsieh, Shizuka

doi:10.1016/j.chemphys.2017.03.003

Cited by 3 publications

(1 citation statement)

References 45 publications

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“…Cao et al discovered a red shift of the FTIR spectra in the FEC-containing electrolyte compared with the FEC-free electrolyte because of the intermolecular interaction with the fluorine compounds . Many reports confirmed that the hydroxyl groups on the metal oxide surface have a high capability to form hydrogen bonds on the surface. − Moreover, the strong hydrogen bonding between the organic fluorine atom and the hydroxyl group in the form of OH···F interactions has been widely reported. − Hence, in our case, we speculate that NaF can form hydrogen bonding with the hydroxyl groups in amorphous TiO 2 , which shares the electrons surrounding the fluorine in F-organics bonds . Therefore, the electron cloud density surrounding the fluorine for participating the F organic bonds will decrease.…”

Section: Discussionsupporting

confidence: 51%

Engineering Solid Electrolyte Interphase on Red Phosphorus for Long-Term and High-Capacity Sodium Storage

Zhang

Yang

et al. 2019

Chem. Mater.

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A solid electrolyte interphase (SEI) makes a critical impact on the cyclic property of anodes for both lithium-and sodium-ion batteries (LIBs/SIBs), which is more significant for high-capacity anodes. Unfortunately, it is arduous to control the components of the SEI and its arrangement due to the unstable interface resulting from the decomposition, rupture, and regeneration of the SEI and the complex chemical environment. Here, we report a synergistic in situ and ex situ strategy to tailor the interface of an active material, which enables an SEI with superb mechanical behavior to form in the Helmholtz region around the interface. The amorphous TiO 2 as a protection layer shows strong interaction with the reduction product (i.e., NaF) of fluoroethylene carbonate additive, which enhances the adhesion of the SEI to the electrode material. The shedding of the SEI during the huge volume expansion of the active material is substantially suppressed. Furthermore, the toughness of the SEI is increased by the binding of NaF with the organic components. When incorporating this synergistic strategy into a red phosphorus/carbon nanotube composite, the dual layers containing mostly inorganics in the interior and organics in the exterior constitute a thin, uniform, and robust SEI film with high ionic conductivity, which leads to ultrastable sodium storage with increased initial Coulombic efficiency. In addition, this research indicates that increasing the amount of some crucial SEI components (such as NaF) is not necessarily better; rather, the judicious configuration of such SEI components looks more important for battery performance. This universal approach for engineering the SEI component and structure suggests new insights into SEI chemistry and can be extended to unraveling most of the interface or SEI issues for other rechargeable batteries.

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Section: Discussionsupporting

confidence: 51%

Engineering Solid Electrolyte Interphase on Red Phosphorus for Long-Term and High-Capacity Sodium Storage

Zhang

Yang

et al. 2019

Chem. Mater.

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Controlled release of silica-coated insulin-loaded chitosan nanoparticles as a promising oral administration system

Fathy

Hassan

Elsayed

et al. 2023

BMC Pharmacol Toxicol

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Background Oral insulin administration has recently become one of the most exciting research subjects. Different approaches have been carried out to get an effective oral insulin delivery system using nanotechnology. The development of a delivery system that overcomes the difficulties of oral insulin administration, achieving high stability and minimal side effects, is still an urgent need. Therefore, this study is considered one of the efforts to design a new prospective drug delivery nano-composite (silica-coated chitosan-dextran sulfate nanoparticles). Methods Chitosan-dextran sulfate nanoparticles (CS-DS NPs) were prepared via a complex coacervation method and then coated with silica. Uncoated and silica-coated CS-DS NPs were physically characterized via different techniques. Transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy-dispersive X-ray (EDX) analysis, and atomic force microscopy (AFM) have been used to investigate the chemical elements, size, morphology, and surface properties of the prepared formulations. Differential scanning calorimetry (DSC) to assess the thermal properties of formed nano-formulations. Fourier transform infrared (FT-IR) spectroscopy investigated the silica coat and chitosan interaction. The encapsulation efficiency was evaluated using high-performance liquid chromatography (HPLC) analysis. The insulin release profile of nano-formulations was performed with and without silica coat at two different pHs (5.5,7), nearly simulating the environment of the gastrointestinal tract (GIT). Results The silica-coated CS-DS NPs revealed interesting physicochemical properties exemplified by suitable core particle size obtained by TEM images (145.31 ± 33.15 nm), hydrodynamic diameter (210 ± 21 nm), high stability indicated by their zeta potential value (-32 ± 3.2 mV), and adequate surface roughness assessed by AFM. The encapsulation efficiency of insulin-loaded chitosan nanoparticles (ICN) was (66.5%) higher than that of insulin-chitosan complex nanoparticles (ICCN). The silica-coated ICN demonstrated a controlled insulin release profile at pHs (5.5 and 7) compared with uncoated ICN. Conclusion The silica-coated ICN can be an efficient candidate as a desired oral delivery system, overcoming the common obstacles of peptides and proteins delivery and achieving high stability and controlled release for further applications.

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Chitosan-Dextran-Glycerol Hydrogels Loaded with Iron Oxide Nanoparticles for Wound Dressing Applications

et al. 2022

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Natural polymers have shown tremendous potential towards the development of hydrogels with tissue regeneration properties. Among them, chitosan and dextran are polysaccharides widely applied in the wound dressing area owing to their mucoadhesiveness, biodegradability, hemostatic potential, and intrinsic antibacterial activity, while glycerol is a well-known biocompatible solvent extensively used in the manufacture of cosmetic, pharmaceutical, medical, and personal care products. In order to enhance the properties of natural polymer-based hydrogels, the focus has currently shifted towards the addition of nanomaterials with antibacterial and regenerative potential, i.e., iron oxide nanoparticles. Thus, the aim of the present study was to develop a series of chitosan-dextran-glycerol hydrogels loaded with iron oxide nanoparticles, either readily added or formed in situ. The physicochemical properties of the so obtained hydrogels demonstrated an improved dispersibility of the in situ formed magnetite nanoparticles, which further decreases the porosity and swelling ratio of the hydrogels but increases the antimicrobial properties. Additionally, the presence of glycerol enhances the cell viability but reduces the antimicrobial potential. In this context, the results proved promising biological and antimicrobial properties, thus confirming their potential as biomaterials for wound healing and regeneration.

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Intramolecular hydrogen-bonding effects on O H stretch overtone excitation for fluorinated hydroperoxides

Cited by 3 publications

References 45 publications

Engineering Solid Electrolyte Interphase on Red Phosphorus for Long-Term and High-Capacity Sodium Storage

Engineering Solid Electrolyte Interphase on Red Phosphorus for Long-Term and High-Capacity Sodium Storage

Controlled release of silica-coated insulin-loaded chitosan nanoparticles as a promising oral administration system

Chitosan-Dextran-Glycerol Hydrogels Loaded with Iron Oxide Nanoparticles for Wound Dressing Applications

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