Effect of Polymer Composition and Water Content on Proton Conductivity in Vinyl Benzyl Phosphonic Acid-4-Vinyl Pyridine Copolymers

2008 ◽  
Vol 209 (24) ◽  
pp. 2494-2503 ◽  
Author(s):  
Fengjing Jiang ◽  
Anke Kaltbeitzel ◽  
Birgit Fassbender ◽  
Gunther Brunklaus ◽  
Hongting Pu ◽  
...  
Keyword(s):  
Water Content ◽  
Proton Conductivity ◽  
Phosphonic Acid ◽  
Polymer Composition ◽  
Vinyl Pyridine ◽  
Vinyl Benzyl

Polymorphic layered copper phosphonates: exfoliation and proton conductivity studies

2019 ◽  
Vol 48 (19) ◽  
pp. 6539-6545 ◽  
Author(s):  
Bei Liu ◽  
Jing-Cui Liu ◽  
Yang Shen ◽  
Jian-Shen Feng ◽  
Song-Song Bao ◽  
...  
Keyword(s):  
Proton Conductivity ◽  
Phosphonic Acid ◽  
Proton Conduction ◽  
Layered Compounds

α-Cu(4-cnappH)(H2O) (α-Cu-1), α-Cu(4-cnappH)(H2O)·0.5H2O (α-Cu-2) and β-Cu(4-cnappH)(H2O) (β-Cu) [4-cnappH3 = (4-carboxynaphthalen-1-yl)phosphonic acid] are polymorphic layered compounds. Proton conduction is more favorable in α-Cu-2 than in α-Cu-1, but exfoliation into nanosheets decreases the conductivity.

Crystalline and permanently porous porphyrin-based metal tetraphosphonates

2018 ◽  
Vol 54 (4) ◽  
pp. 389-392 ◽  
Author(s):  
Timo Rhauderwiek ◽  
Konrad Wolkersdörfer ◽  
Sigurd Øien-Ødegaard ◽  
Karl-Petter Lillerud ◽  
Michael Wark ◽  
...  
Keyword(s):  
Proton Conductivity ◽  
Phosphonic Acid ◽  
Sorption Properties

The first porous MOF containing a porphyrin-based phosphonic acid was synthesized and characterized regarding its sorption properties and proton conductivity.

scholarly journals Characteristics, Performance of Blend CA/SPEEK Ultrafiltration Membranes Prepared by Phase Inversion Method using PEG 600 as an Additive

2017 ◽  
Vol 10 (1) ◽  
Author(s):  
G. Arthanareeswaran ◽  
N. Anatharaman ◽  
M. Raajenthiren
Keyword(s):  
Polyethylene Glycol ◽  
Water Content ◽  
Phase Inversion ◽  
Polymer Composition ◽  
Inversion Method ◽  
Hydraulic Permeability ◽  
Equilibrium Water Content ◽  
Ultrafiltration Membranes ◽  
Phase Inversion Method ◽  
Peg 600

Flat sheet asymmetric polymeric membranes is prepared by phase inversion method from homogeneous solution of 17.5 wt% cellulose acetate (CA) and sulfonated poly ether ether ketone (SPEEK) with polar solvent of N, N’– dimethylformamide (DMF). The different concentration of polyethylene glycol is used as the polymeric additives in the CA/SPEEK casting solution. The effects of polyethylene glycol 600 (PEG 600) concentration on the structure and performance of CA/SPEEK ultrafiltration membranes were investigated in more detail. The optimal preparation conditions were: 17.5 wt% total polymer composition, 65/35 wt% CA/SPEEK blend composition and 10 wt% PEG 600. The permeation performances of the membranes were evaluated in terms of pure water flux, equilibrium water content, hydraulic permeability, and solute rejection. The morphology and structure of the resulting membranes were observed by scanning electron microscope (SEM). CA/SPEEK membranes with higher concentration of 10 wt% PEG have higher PWF and equilibrium water content due to high porosity. With increase in PEG concentration from 0 to 10 wt%, the PWF increases from 129 to 259 lm–2h–1 in 65/35 wt% of CA/SPEEK as blend. When increasing concentration of PEG is substituted for SPEEK in proportion to form a homogeneous blend, the membrane hydraulic resistance reduces from 9.2 to 2.9 kPa/l.m–2.h–1for blend membranes with 0 to 10 wt % PEG 600 at 95/5 wt % CA/SPEEK composition. Solution of proteins of different molecular weight was used to study the permeation performance of prepared membranes using a batch membrane cell of 400 ml capacity.

Nafion® Membranes: Molecular Diffusion, Proton Conductivity and Proton Conduction Mechanism

1992 ◽  
Vol 293 ◽  
Author(s):  
Klaus-Dieter Kreuer ◽  
Thomas Dippel ◽  
Wolfgang Meyer ◽  
Joachim Maier
Keyword(s):  
Water Content ◽  
Proton Conductivity ◽  
Molecular Diffusion ◽  
Local Environment ◽  
Bulk Water ◽  
Exponential Factor ◽  
Nmr Diffusion ◽  
The One ◽  
Low Degrees ◽  
Pfg Nmr

AbstractH-PFG-NMR diffusion and proton conductivity data for NAFION® 117 is presented as a function of temperature and water content. From this, H2O diffusion on a molecular scale is concluded to be similar to the one in bulk water. But “geometrical” restrictions of diffusion lead to a decreasing pre-exponential factor, i.e. decreasing macroscopic diffusion coefficient with decreasing water content. It is shown that proton conductivity is correlated with water diffusion for low degrees of hydration (vehicle mechanism). With increasing hydration there is an increasing contribution from “structure diffusion” culminating in an amplification factor of A = 2.5 for fully hydrated protonic NAFION® 117 at room temperature. The bonding of water in NAFION® as well as the local environment (hydration) of the acidic proton are concluded to be similar as in acidic aqueous solutions.

Proton conductivity and diffusion study of molten phosphonic acid H3PO3

2008 ◽  
Vol 179 (15-16) ◽  
pp. 523-528 ◽  
Author(s):  
M SCHUSTER ◽  
K KREUER ◽  
H STEININGER ◽  
J MAIER
Keyword(s):  
Proton Conductivity ◽  
Phosphonic Acid ◽  
Diffusion Study ◽  
And Diffusion
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