scholarly journals Effect of PAMAM Dendrimers on Interactions and Transport of LiTFSI and NaTFSI in Propylene Carbonate-Based Electrolytes

Polymers ◽  
2020 ◽  
Vol 12 (7) ◽  
pp. 1595
Author(s):  
Rafał Konefał ◽  
Zuzana Morávková ◽  
Bartosz Paruzel ◽  
Vitalii Patsula ◽  
Sabina Abbrent ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Raman Spectroscopy ◽  
Propylene Carbonate ◽  
Diffusion Coefficients ◽  
Pamam Dendrimers ◽  
Conductivity Measurements ◽  
Ions Transport ◽  
All Solutions ◽  
Lithium Diffusion ◽  
Pfg Nmr

Poly(amidoamine) (PAMAM)-based electrolytes are prepared by dissolving the PAMAM half-generations G1.5 or G2.5 in propylene carbonate (PC), either with lithium bis(trifluoromethylsulfonyl)imide (LiTFSI) or sodium bis(trifluoromethylsulfonyl)imide (NaTFSI) salts. The solutions, designed for ion battery applications, are studied in terms of ions transport properties. Raman Spectroscopy reveals information about the interactions between cations and PAMAM dendrimers as well as full dissociation of the salts in all solutions. Pulsed-field gradient Nuclear Magnetic Resonance (PFG NMR), measured as a function of both temperature and PAMAM concentration, are obtained for the cation, anion, solvent, and dendrimer molecules using lithium (7Li), sodium (23Na), fluorine (19F), and hydrogen (1H) NMR, respectively. It was found that lithium diffusion is slow compared to the larger TFSI anion and decreases with PAMAM concentration due to interactions between cation and dendrimer. Comparison of conductivities calculated from diffusion coefficients using the Nernst–Einstein equation, with conductivity measurements obtained from Impedance Spectroscopy (IS), shows slightly higher IS conductivities, caused among others by PAMAM conductivity.

scholarly journals Ion Transport Properties and Ionicity of 1,3-Dimethyl-1,2,3-Triazolium Salts with Fluorinated Anions

Materials ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 1723 ◽  
Author(s):  
Martin Pulst ◽  
Yury Golitsyn ◽  
Detlef Reichert ◽  
Jörg Kressler
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Nmr Spectroscopy ◽  
Diffusion Coefficients ◽  
Important Class ◽  
Spectroscopy Data ◽  
Ion Conductivities ◽  
Electrochemical Devices ◽  
Pfg Nmr ◽  
Conductive Properties ◽  
Triazolium Salts

1,2,3-Triazolium salts are an important class of materials with a plethora of sophisticated applications. A series of three novel 1,3-dimethyl-1,2,3-triazolium salts with fluorine, containing anions of various size, is synthesized by methylation of 1,2,3-triazole. Their ion conductivity is measured by impedance spectroscopy, and the corresponding ionicities are determined by diffusion coefficients obtained from 1H and 19F pulsed field gradient nuclear magnetic resonance (PFG NMR) spectroscopy data, revealing that the anion strongly influences their ion conductive properties. Since the molar ion conductivities and ionicities of the 1,3-dimethyl-1,2,3-triazolium salts are enhanced in comparison to other 1,2,3-triazolium salts with longer alkyl substituents, they are promising candidates for applications as electrolytes in electrochemical devices.

Pulsed-field gradient nuclear magnetic resonance measurements (PFG NMR) for diffusion ordered spectroscopy (DOSY) mapping

The Analyst ◽  
2017 ◽  
Vol 142 (20) ◽  
pp. 3771-3796 ◽  
Author(s):  
G. Pagès ◽  
V. Gilard ◽  
R. Martino ◽  
M. Malet-Martino
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Field Gradient ◽  
Intermolecular Interactions ◽  
Diffusion Coefficients ◽  
Multicomponent Systems ◽  
Pulsed Field ◽  
Chemical Systems ◽  
Dosy Nmr ◽  
Pfg Nmr

The advent of Diffusion Ordered SpectroscopY (DOSY) NMR has enabled diffusion coefficients to be routinely measured and used to characterize chemical systems in solution. Indeed, DOSY NMR allows the separation of the chemical entities present in multicomponent systems and provides information on their intermolecular interactions as well as on their size and shape.

scholarly journals Measuring translational diffusion coefficients of peptides and proteins by PFG-NMR using band-selective RF pulses

2014 ◽  
Vol 43 (6-7) ◽  
pp. 331-339 ◽  
Author(s):  
Shenggen Yao ◽  
Daniel K. Weber ◽  
Frances Separovic ◽  
David W. Keizer
Keyword(s):  
Diffusion Coefficients ◽  
Translational Diffusion ◽  
Rf Pulses ◽  
Pfg Nmr

Polymorphous Silicon Films Produced in Large Area Reactors by PECVD at 27.12 MHz and 13.56 MHz

2003 ◽  
Vol 762 ◽  
Author(s):  
H. Águas ◽  
L. Raniero ◽  
L. Pereira ◽  
E. Fortunato ◽  
P. Roca i Cabarrocas ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Spectroscopic Ellipsometry ◽  
Conductivity Measurements ◽  
Large Area ◽  
Structural Characterisation ◽  
Hydrogen Dilution ◽  
Infrared And Raman Spectroscopy ◽  
Impedance Probe ◽  
Si Films ◽  
Probe Measurements

AbstractThis work refers to a study performed on polymorphous silicon (pm-Si:H) at excitation frequencies of 13.56 and 27.12 MHz in a large area PECVD reactor. The plasma was characterised by impedance probe measurements, aiming to identify the plasma conditions that lead to produce pm-Si:H films. The films produced were characterised by spectroscopic ellipsometry, infrared and Raman spectroscopy and hydrogen exodiffusion experiments, which are techniques that permit the structural characterisation of the pm-Si films and to study the possible differences between the films deposited at 13.56 and 27.12 MHz. Conductivity measurements were also performed to determine the transport properties of the films produced. The set of data obtained show that the 27.12 MHz pm-Si:H can be grown at higher rates with less hydrogen dilution and power density, being the resulting films denser, chemically more stable and with improved performances than the pm-Si:H films grown at 13.56 MHz.

Predicting the release profile of small molecules from within the ordered nanostructured lipidic bicontinuous cubic phase using translational diffusion coefficients determined by PFG-NMR

Nanoscale ◽  
2017 ◽  
Vol 9 (7) ◽  
pp. 2471-2478 ◽  
Author(s):  
Thomas G. Meikle ◽  
Shenggen Yao ◽  
Alexandru Zabara ◽  
Charlotte E. Conn ◽  
Calum J. Drummond ◽  
...  
Keyword(s):  
Small Molecules ◽  
Diffusion Coefficients ◽  
Translational Diffusion ◽  
Release Profile ◽  
Cubic Phase ◽  
Bicontinuous Cubic ◽  
Pfg Nmr
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