Modification of the mechanism of proton conductivity of the perfluorinated membrane copolymer by nanodiamonds

Kulvelis, Yu. V.; Primachenko, O. N.; Гофман, И. В.; Odinokov, A. S.; Shvidchenko, A. V.; Yudina, Elena B.; Marinenko, E. A.; Лебедев, В. Т.; Vul, A. Ya.

doi:10.1007/s11172-021-3274-4

Cited by 10 publications

(4 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…% of DND Z+ (SEM, d), 1.9 wt. % of DND-F (SEM, e); Figure S3: Stress-strain diagrams for samples of the Aquivion ® -type membranes with DND-F; Table S1: Composites of the Aquivion ® -type membranes with DND-F. References [119,120] are cited in the supplementary materials.…”

Section: Supplementary Materialsmentioning

confidence: 99%

Electrochemical Properties and Structure of Membranes from Perfluorinated Copolymers Modified with Nanodiamonds

Lebedev,

Kulvelis,

Shvidchenko

et al. 2023

Membranes

View full text Add to dashboard Cite

In this study, we aimed to design and research proton-conducting membranes based on Aquivion®-type material that had been modified with detonation nanodiamonds (particle size 4–5 nm, 0.25–5.0 wt. %). These nanodiamonds carried different functional groups (H, OH, COOH, F) that provided the hydrophilicity of the diamond surface with positive or negative potential, or that strengthened the hydrophobicity of the diamonds. These variations in diamond properties allowed us to find ways to improve the composite structure so as to achieve better ion conductivity. For this purpose, we prepared three series of membrane films by first casting solutions of perfluorinated Aquivion®-type copolymers with short side chains mixed with diamonds dispersed on solid substrates. Then, we removed the solvent and the membranes were structurally stabilized during thermal treatment and transformed into their final form with –SO3H ionic groups. We found that the diamonds with a hydrogen-saturated surface, with a positive charge in aqueous media, contributed to the increase in proton conductivity of membranes to a greater rate. Meanwhile, a more developed conducting diamond-copolymer interface was formed due to electrostatic attraction to the sulfonic acid groups of the copolymer than in the case of diamonds grafted with negatively charged carboxyls, similar to sulfonic groups of the copolymer. The modification of membranes with fluorinated diamonds led to a 5-fold decrease in the conductivity of the composite, even when only a fraction of diamonds of 1 wt. % were used, which was explained by the disruption in the connectivity of ion channels during the interaction of such diamonds mainly with fluorocarbon chains of the copolymer. We discussed the specifics of the mechanism of conductivity in composites with various diamonds in connection with structural data obtained in neutron scattering experiments on dry membranes, as well as ideas about the formation of cylindrical micelles with central ion channels and shells composed of hydrophobic copolymer chains. Finally, the characteristics of the network of ion channels in the composites were found depending on the type and amount of introduced diamonds, and correlations between the structure and conductivity of the membranes were established.

show abstract

Section: Supplementary Materialsmentioning

confidence: 99%

Electrochemical Properties and Structure of Membranes from Perfluorinated Copolymers Modified with Nanodiamonds

Lebedev,

Kulvelis,

Shvidchenko

et al. 2023

Membranes

View full text Add to dashboard Cite

show abstract

“…Recently, we have studied PFSA Aquivion ® -type compositional membranes with either negatively charged carboxylated nanodiamonds [ 33 ] with a negative ζ-potential (DND Z−) [ 34 , 35 , 36 ] or positively charged protonated nanodiamonds [ 37 ] with a positive ζ-potential (DND Z+) [ 36 , 38 ]. We demonstrated that DND Z+ distributed in the membrane matrix much more homogeneously, forming rough aggregates below 300 nm in size, while DND Z− strongly agglomerated to micron-size particles.…”

Section: Introductionmentioning

confidence: 99%

Improving PFSA Membranes Using Sulfonated Nanodiamonds

Shvidchenko,

Odinokov,

Primachenko

et al. 2023

Membranes

View full text Add to dashboard Cite

Aquivion®-type perfluorosulfonic acid membranes with a polytetrafluoroethylene backbone and short side chains with sulfonic acid groups at the ends have great prospects for operating in hydrogen fuel cells. To improve the conducting properties of membranes, various types of nanofillers can be used. We prepared compositional Aquivion®-type membranes with embedded detonation nanodiamond particles. Nanodiamonds were chemically modified with sulfonic acid groups to increase the entire amount of ionogenic groups involved in the proton conductivity mechanism in compositional membranes. We demonstrated the rise of proton conductivity at 0.5–2 wt.% of sulfonated nanodiamonds in membranes, which was accompanied by good mechanical properties. The basic structural elements, conducting channels in membranes, were not destroyed in the presence of nanodiamonds, as follows from small-angle neutron scattering data. The prepared compositional membranes can be used in hydrogen fuel cells to achieve improved performance.

show abstract

“…DND could be modified/functionalized to tune their properties for further incorporation into polymer matrices. For example, a method was reported to improve the properties of the proton conducting membranes [ 184 ]. The authors used the Aquivion ® type perfluorinated copolymer with short side chains and doped it with DND.…”

Section: Tuning the Properties Of Composites Through The Introduction...mentioning

confidence: 99%

On the Use of Polymer-Based Composites for the Creation of Optical Sensors: A Review

2022

View full text Add to dashboard Cite

Polymers are widely used in many areas, but often their individual properties are not sufficient for use in certain applications. One of the solutions is the creation of polymer-based composites and nanocomposites. In such materials, in order to improve their properties, nanoscale particles (at least in one dimension) are dispersed in the polymer matrix. These properties include increased mechanical strength and durability, the ability to create a developed inner surface, adjustable thermal and electrical conductivity, and many others. The materials created can have a wide range of applications, such as biomimetic materials and technologies, smart materials, renewable energy sources, packaging, etc. This article reviews the usage of composites as a matrix for the optical sensors and biosensors. It highlights several methods that have been used to enhance performance and properties by optimizing the filler. It shows the main methods of combining indicator dyes with the material of the sensor matrix. Furthermore, the role of co-fillers or a hybrid filler in a polymer composite system is discussed, revealing the great potential and prospect of such matrixes in the field of fine properties tuning for advanced applications.

show abstract

Modification of the mechanism of proton conductivity of the perfluorinated membrane copolymer by nanodiamonds

Cited by 10 publications

References 15 publications

Electrochemical Properties and Structure of Membranes from Perfluorinated Copolymers Modified with Nanodiamonds

Electrochemical Properties and Structure of Membranes from Perfluorinated Copolymers Modified with Nanodiamonds

Improving PFSA Membranes Using Sulfonated Nanodiamonds

On the Use of Polymer-Based Composites for the Creation of Optical Sensors: A Review

Contact Info

Product

Resources

About