Activity of counterions in hydrogels based on poly(acrylic acid) and poly(methacrylic acid): Potentiometric measurements

Сафронов, А. П.; Камалов, И. А.; Shklyar, T. F.; Dinislamova, Olga A.; Blyakhman, F. A.

doi:10.1134/s0965545x12090088

Cited by 11 publications

(11 citation statements)

References 17 publications

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“…The data suggest that the process is endothermic because after establishing the contact with water heat is removed from the water pool indicated by decreasing 1, 2 and increasing 3, 4 values. Interestingly, this finding is in accordance with recently published data of swelling enthalpies of PAA gels under isobaric swelling conditions [36] 29 . In contrast to the PAA gel, the data for the PNIPAM-PSS gel show a much weaker response suggesting a slight exothermic heat effect.…”

Section: Heat Effect Of Swellingsupporting

confidence: 93%

How much weighs the swelling pressure

Höhne

Tauer

2014

Colloid Polym Sci

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We are presenting a new method to study the swelling of gels by following the apparent weight increase during confined swelling. This method, compared to other procedures, is characterized by its simplicity and versatility to study the influence of the experimental conditions such as composition of the swelling agent and temperature. Examples are given for poly(acrylic acid) and poly(N-isopropyl acrylamide) hydrogels and the influence of ethanol content, pH, and temperature in the water pool.

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Section: Heat Effect Of Swellingsupporting

confidence: 93%

How much weighs the swelling pressure

Höhne

Tauer

2014

Colloid Polym Sci

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“…The testing of the electrical properties of ferrogels was performed using a laboratory installation for the electrical potential measurement in biophysical systems described elsewhere [ 33 , 34 ]. The measurement of the electrical potential of ferrogel was done by two identical Ag/AgCl tapered glass microelectrodes (~1 micron in tip diameter) typically used in biophysical studies for intracellular voltage measurement.…”

Section: Experimental Methodsmentioning

confidence: 99%

Mechanical, Electrical and Magnetic Properties of Ferrogels with Embedded Iron Oxide Nanoparticles Obtained by Laser Target Evaporation: Focus on Multifunctional Biosensor Applications

Blyakhman

Buznikov

Sklyar

et al. 2018

Sensors

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Hydrogels are biomimetic materials widely used in the area of biomedical engineering and biosensing. Ferrogels (FG) are magnetic composites capable of functioning as magnetic field sensitive transformers and field assisted drug deliverers. FG can be prepared by incorporating magnetic nanoparticles (MNPs) into chemically crosslinked hydrogels. The properties of biomimetic ferrogels for multifunctional biosensor applications can be set up by synthesis. The properties of these biomimetic ferrogels can be thoroughly controlled in a physical experiment environment which is much less demanding than biotests. Two series of ferrogels (soft and dense) based on polyacrylamide (PAAm) with different chemical network densities were synthesized by free-radical polymerization in aqueous solution with N,N’-methylene-diacrylamide as a cross-linker and maghemite Fe2O3 MNPs fabricated by laser target evaporation as a filler. Their mechanical, electrical and magnetic properties were comparatively analyzed. We developed a giant magnetoimpedance (MI) sensor prototype with multilayered FeNi-based sensitive elements deposited onto glass or polymer substrates adapted for FG studies. The MI measurements in the initial state and in the presence of FG with different concentrations of MNPs at a frequency range of 1–300 MHz allowed a precise characterization of the stray fields of the MNPs present in the FG. We proposed an electrodynamic model to describe the MI in multilayered film with a FG layer based on the solution of linearized Maxwell equations for the electromagnetic fields coupled with the Landau-Lifshitz equation for the magnetization dynamics.

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“…With microelectrode, the electrodes have also been adopted to study the electric signals in and out of neuron and muscle cells. [18][19][20][21][22][23] Naturally, Some studies have been performed to use the microelectrode technique (MET) to measure the 3D electric potential of polyelectrolyte hydrogels 5,[24][25][26][27][28][29][30] .…”

Section: Introductionmentioning

confidence: 99%

“…Because of this reason, previous studies on hydrogel using microelectrode technique failure to obtain the potential quantitatively, especially in the case of brittle polyelectrolyte gels. 5,[26][27][28][29] To apply MET for the accurate measurement of the electric potential distribution, a systematic study on the correlations between the potentials measured and the microelectrode geometry, the inserting speed, are needed, which is hardly done yet due to technical difficulties. 32 The objective of this study is to establish a microelectrode technique to quantitatively study the electrical potential of polyelectrolyte hydrogels.…”

Section: Introductionmentioning

confidence: 99%

Quantitative Observation of Electric Potential Distribution of Brittle Polyelectrolyte Hydrogels Using Microelectrode Technique

et al. 2016

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We report, for the first time, the quantitative measurement of the local electric potential of brittle polyelectrolyte hydrogels using the microelectrode technique (MET). Given the solid-like nature of the hydrogels, the difficulty of applying MET is how to make a good contact of the microelectrode to the hydrogel. Poor local contact substantial underestimates the potential. We observed that, the potential measured decays exponentially with the increase of capillary diameter of the microelectrode. This behavior is related to the capillary wall thickness that determines the contact distance of the electrode probe to the hydrogel. The characteristic decay length in respective to the wall thickness is very close to the local Debye length around the capillary. The latter is much larger than that of the bath solution due to the reverse osmosis effect. By using microelectrodes with a tip wall thickness less than the local Debye length, the Donnan potential of polyelectrolyte gel could be accurately measured. Using a micromanipulator, the inserting process of the microelectrode is precisely controlled, and the depth profile of electric potential in the hydrogels can be measured with a spatial resolution down to ∼5 nm. From the spatial distribution of potential, the microstructure of hydrogels both in bulk and near the surface, the thickness of ultrathin hydrogels, and the heterogeneous layered structure of composite gels, can be determined accurately. The MET established in this work provides a powerful tool for direct characterization of the spatial distribution of electric potential of hydrogels

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Activity of counterions in hydrogels based on poly(acrylic acid) and poly(methacrylic acid): Potentiometric measurements

Cited by 11 publications

References 17 publications

How much weighs the swelling pressure

How much weighs the swelling pressure

Mechanical, Electrical and Magnetic Properties of Ferrogels with Embedded Iron Oxide Nanoparticles Obtained by Laser Target Evaporation: Focus on Multifunctional Biosensor Applications

Quantitative Observation of Electric Potential Distribution of Brittle Polyelectrolyte Hydrogels Using Microelectrode Technique

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