How the interactions with humic acids affect the mobility of ionic dyes in hydrogels – 2. Non-stationary diffusion experiments

Sedláček, Petr; Smilek, Jiří; Klučáková, Martina

doi:10.1016/j.reactfunctpolym.2013.12.002

Cited by 21 publications

(35 citation statements)

References 47 publications

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“…The mixture was slowly heated with continuous stirring up to 80 • C and stirred at this temperature in order to obtain a transparent solution, and finally sonicated (1 min) to remove gasses. AG hydrogels were prepared using 1 wt % AG solution [21][22][23][24]. Afterwards, the AG solution was slowly poured into the polymethylmethacrylate (PMMA) spectrophotometric cuvette (inner dimensions: 10 mm × 10 mm × 45 mm).…”

Section: Preparation Of Hydrogelsmentioning

confidence: 99%

“…Flat surface of the boundary of resulting hydrogels was provided by wiping an excess solution away. Gentle cooling of cuvettes at the laboratory temperature led to the gradual gelation of the mixture [22,23]. AG-HA hydrogels were prepared from 1 wt % AG solution containing 0.01 wt % of HA.…”

Section: Preparation Of Hydrogelsmentioning

confidence: 99%

“…AG-HA hydrogels were prepared from 1 wt % AG solution containing 0.01 wt % of HA. The AG and humic contents in final hydrogels were chosen on the basis of our previous results and experimental experiences [21][22][23][24]. Images of pure agarose hydrogel and hydrogel enriched by humic acids in cuvettes are shown in Figure S1 (from the Supplementary Materials).…”

Section: Preparation Of Hydrogelsmentioning

confidence: 99%

“…The cuvettes were taken out of the leachates and the UV-VIS spectra were measured at various distances from the orifice by means of Varian Cary 50 UV-VIS spectrophotometer equipped with the special accessory providing controlled fine vertical movement of the cuvette in the spectrophotometer. Using the collected UV-VIS spectra, the concentrations of the probes were determined at different positions in gels [22]. The obtained data were used to compute the concentration profiles of probes in the cuvettes.…”

Section: Diffusion-release Experimentsmentioning

confidence: 99%

“…In our previous studies [21][22][23][24], agarose hydrogels were enriched by humic acids as an active component in order to support the complexation of diffusing particles in hydrogels. Humic-agarose hydrogels were characterized by means of their viscoelastic properties [21,24], and the transport of different ions through the hydrogels was studied by means of diffusion cells [21,23,24] and non-stationary transient diffusion [22,23]. The effect of acidic functional groups of humic acids on the complexation and transport of metal and dye ions was investigated by means of the selective blocking of carboxylic groups by methylation [23,24].…”

Section: Introductionmentioning

confidence: 99%

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Agarose Hydrogels Enriched by Humic Acids as the Complexation Agent

Klučáková

2020

Polymers

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The transport properties of agarose hydrogels enriched by humic acids were studied. Methylene blue, rhodamine 6G and Cu(II) ions were incorporated into hydrogel as diffusion probes, and then their release into water was monitored. Cu(II) ions as well as both the dyes studied in this work have high affinity to humic substances and their interactions strongly affected their diffusion in hydrogels. It was confirmed that humic acids retarded the transport of diffusion probes. Humic acids’ enrichment caused the decrease in the values of effective diffusion coefficients due to their complexation with diffusion probes. In general, the diffusion of dyes was more affected by the complexation with humic acids in comparison with Cu(II) ions. The effect of complexation was selective for the particular diffusion probe. The strongest effect was obtained for the diffusion of methylene blue. It was assumed that metal ions interacted preferentially with acidic functional groups. In contrast to Cu(II) ions, dyes can interact with acidic functional groups, and the condensed cyclic structures of the dye probes supported their interactions with the hydrophobic domains of humic substances.

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Section: Preparation Of Hydrogelsmentioning

confidence: 99%

Section: Preparation Of Hydrogelsmentioning

confidence: 99%

Section: Preparation Of Hydrogelsmentioning

confidence: 99%

Section: Diffusion-release Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Agarose Hydrogels Enriched by Humic Acids as the Complexation Agent

Klučáková

2020

Polymers

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Proton diffusion in PAM hydrogels

Chen,

Ren,

Xiang

2023

Polymer Engineering & Sci

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Hydrogels are widely used in the field of biomedicine because of their excellent biocompatibility. In most cases, the pH range applicable to drugs is limited, so it is meaningful to study the diffusion of protons in hydrogels. In this work, the diffusion rate of protons in hydrogels was monitored by a self‐made device, and the factors affecting the diffusion rate of protons were studied. The self‐made device consists of a supply chamber and a receiving chamber with a piece of hydrogel sandwiching between them. It was found that the thickness of hydrogel had a great influence on proton diffusion. The thicker the hydrogel is, the slower the proton diffusion rate is. At the same time, the diffusion coefficient of protons in PAM hydrogel was calculated to be 1.28 ± 0.09 × 10−5 cm2/s (HCl, 25°C). The diffusion coefficient is a function of temperature, and its value increases with the increase in temperature. The effect of the solid content of hydrogel on proton diffusion was also considered, but in the range of solid content 1.81%–10.07%, the proton diffusion rate was almost unaffected. Moreover, anions also have a decisive effect on proton diffusion, with smaller anions leading to faster proton diffusion in the hydrogel.

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