scholarly journals Ionic Transport Properties of P2O5-SiO2 Glassy Protonic Composites Doped with Polymer and Inorganic Titanium-based Fillers

Materials ◽  
2020 ◽  
Vol 13 (13) ◽  
pp. 3004
Author(s):  
Maciej Siekierski ◽  
Maja Mroczkowska-Szerszeń ◽  
Rafał Letmanowski ◽  
Dariusz Zabost ◽  
Michał Piszcz ◽  
...  
Keyword(s):  
Transport Properties ◽  
Continuous Wave ◽  
Electrochemical Impedance ◽  
Pore Space ◽  
Poly Vinyl Alcohol ◽  
Proton Mobility ◽  
Polymeric Additives ◽  
Wave Technique ◽  
Poly Ethylene

This paper is focused on the determination of the physicochemical properties of a composite inorganic–organic modified membrane. The electrical conductivity of a family of glassy protonic electrolytes defined by the general formula (P2O5)x(SiO2)y, where x/y is 3/7 are studied by Alternating Current electrochemical impedance spectroscopy (AC EIS) method. The reference glass was doped with polymeric additives—poly(ethylene oxide) (PEO) and poly(vinyl alcohol) (PVA), and additionally with a titanium-oxide-based filler. Special attention was paid to determination of the transport properties of the materials thus modified in relation to the charge transfer phenomena occurring within them. The electrical conductivities of the ‘dry’ material ranged from 10−4 to 10−9 S/cm, whereas for ‘wet’ samples the values were ~10−3 S/cm. The additives also modified the pore space of the samples. The pore distribution and specific surface of the modified glassy systems exhibited variation with changes in electrolyte chemical composition. The mechanical properties of the samples were also examined. The Young’s modulus and Poisson’s ratio were determined by the continuous wave technique (CWT). Based on analysis of the dispersion of the dielectric losses, it was found that the composite samples exhibit mixed-type proton mobility with contributions related to both the bulk of the material and the surface of the pore space.

scholarly journals Assessment of geometrical and transport properties of a fibrous C/C composite preform as digitized by x-ray computerized microtomography: Part II. Heat and gas transport properties

2007 ◽  
Vol 22 (6) ◽  
pp. 1537-1550 ◽  
Author(s):  
Gerard L. Vignoles ◽  
Olivia Coindreau ◽  
Azita Ahmadi ◽  
Dominique Bernard
Keyword(s):  
Transport Properties ◽  
Pore Space ◽  
Three Dimensional ◽  
Carbon Composite ◽  
X Ray ◽  
Gas Transport Properties ◽  
Change Of Scale ◽  
Local Determination ◽  
Good Agreement

Raw and partially infiltrated carbon–carbon composite preforms have been scanned by high-resolution synchrotron radiation x-ray computerized microtomography. Three-dimensional high-quality images of the pore space have been produced at two distinct resolutions and have been used for the computation of transport properties: heat conductivity, binary gas diffusivities, Knudsen diffusivities, and viscous flow permeabilities. The computation procedures are based on a double change-of-scale strategy suited to the bimodal nature of pore space and on the local determination of transport anisotropy. Good agreement has been found between all calculated quantities and experimental data.

scholarly journals Influence of the anatase/rutile ratio on the charge transport properties of TiO2-NTs arrays studied by dual wavelength opto-electrochemical impedance spectroscopy

2017 ◽  
Vol 19 (46) ◽  
pp. 31469-31478 ◽  
Author(s):  
T. Cottineau ◽  
H. Cachet ◽  
V. Keller ◽  
E. M. M. Sutter
Keyword(s):  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Charge Transport ◽  
Transport Properties ◽  
Electrochemical Impedance ◽  
Dual Wavelength ◽  
Tio2 Nts

Dual wavelength IMPS allows the determination of the charge transport properties of multiphasic photo-electrodes.

Free volume defects and transport properties of mechanically stable polyhedral oligomeric silsesquioxane embedded poly(vinyl alcohol)‐poly(ethylene oxide) blend membranes

2019 ◽  
Vol 68 (7) ◽  
pp. 1280-1291 ◽  
Author(s):  
Valiya Parambath Swapna ◽  
Padinharu Madathil Gopalakrishnan Nambissan ◽  
Selvin P Thomas ◽  
Abitha Vayyaprontavida Kaliyathan ◽  
Thomasukutty Jose ◽  
...  
Keyword(s):  
Ethylene Oxide ◽  
Transport Properties ◽  
Free Volume ◽  
Vinyl Alcohol ◽  
Polyhedral Oligomeric Silsesquioxane ◽  
Poly Vinyl Alcohol ◽  
Blend Membranes ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene ◽  
Oligomeric Silsesquioxane

On the Properties of an Ion Conductive System Incorporated in Hybrid Films

2000 ◽  
Vol 628 ◽  
Author(s):  
G. González ◽  
P. J. Retuert ◽  
S. Fuentes
Keyword(s):  
Electrochemical Impedance ◽  
Ternary Phase Diagram ◽  
Lithium Perchlorate ◽  
Molar Ratio ◽  
Ionic Conductors ◽  
X Ray Diffraction ◽  
Poly Ethylene Oxide ◽  
Ion Conducting ◽  
Poly Ethylene ◽  
High Degree

ABSTRACTBlending the biopolymer chitosan (CHI) with poly (aminopropilsiloxane) oligomers (pAPS), and poly (ethylene oxide) (PEO) in the presence of lithium perchlorate lead to ion conducting products whose conductivity depends on the composition of the mixture. A ternary phase diagram for mixtures containing 0.2 M LiClO4 shows a zone in which the physical properties of the products - transparent, flexible, mechanically robust films - indicate a high degree of molecular compatibilization of the components. Comparison of these films with binary CHI-pAPS nanocomposites as well as the microscopic aspect, thermal behavior, and X-ray diffraction pattern of the product with the composition PEO/CHI/pAPS/LiClO4 1:0.5:0.6:0.2 molar ratio indicates that these films may be described as a layered nanocomposite. In this composite, lithium species coordinated by PEO and pAPS should be inserted into chitosan layers. Electrochemical impedance spectroscopy measurements indicate the films are pure ionic conductors with a maximal bulk conductivity of 1.7*10-5 Scm-1 at 40 °C and a sample-electrode interface capacitance of about 1.2*10-9 F.

Contribution to the determination of relative increment of internal energy at low deformation of cross-linked rubber

1980 ◽  
Vol 45 (8) ◽  
pp. 2315-2318 ◽  
Author(s):  
Vladimír Pollák ◽  
Andrej Romanov
Keyword(s):  
Internal Energy ◽  
Vinyl Acetate ◽  
Temperature Changes ◽  
Relative Increment ◽  
Poly Ethylene ◽  
Small Deformations

The relative charge of the internal energy, fU/f, during deformation of cross-linked elastomers, poly(ethylene-co-propylene) and poly(ethylene-co-vinyl acetate), was determined at various temperatures. Anomalies in the dependence of fU/f on relative dilatation in the region of small deformations ( 35%) are to a large extent besides other factors due to the sensibility of the formula used to calculate fU/f to temperature changes.

Sign in / Sign up

Export Citation Format

Share Document