How Humic Acids Affect the Rheological and Transport Properties of Hydrogels
Humic acids are often regarded as substances with a supramolecular structure which plays an important role in Nature. Their addition into hydrogels can affect their behavior and functioning in different applications. This work is focused on the properties of widely-used hydrogel based on agarose aft...
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doaj-c3b0e28b53d34b1d9a92b779bbc24d222020-11-25T00:08:14ZengMDPI AGMolecules1420-30492019-04-01248154510.3390/molecules24081545molecules24081545How Humic Acids Affect the Rheological and Transport Properties of HydrogelsMartina Klucakova0Jiri Smilek1Petr Sedlacek2Materials Research Centre, Faculty of Chemistry, Brno University of Technology, Purkynova 118/464, 612 00 Brno, Czech RepublicMaterials Research Centre, Faculty of Chemistry, Brno University of Technology, Purkynova 118/464, 612 00 Brno, Czech RepublicMaterials Research Centre, Faculty of Chemistry, Brno University of Technology, Purkynova 118/464, 612 00 Brno, Czech RepublicHumic acids are often regarded as substances with a supramolecular structure which plays an important role in Nature. Their addition into hydrogels can affect their behavior and functioning in different applications. This work is focused on the properties of widely-used hydrogel based on agarose after addition of humic acids–the protonated H-form of humic acids and humic acids with methylated carboxylic groups. Hydrogels enriched by humic acids were studied in terms of their viscoelastic and transport properties. Rotational rheometry and methods employing diffusion cells were used in order to describe the influence of humic acids on the properties and behavior of hydrogels. From the point of view of rheology the addition of humic acids mainly affected the loss modulus corresponding to the relaxation of hydrogel connected with its flow. In the case of diffusion experiments, the transport of dyes (methylene blue and rhodamine) and metal ions (copper and nickel) through the hydrogel was affected by interactions between humic acids and the diffusion probes. The time lag in the hydrogel enriched by humic acids was prolonged for copper, methylene blue and rhodamine. In contrast, the presence of humic acids in hydrogel slightly increased the mobility of nickel. The strongest influence of the methylation of humic acids on diffusion was observed for methylene blue.https://www.mdpi.com/1420-3049/24/8/1545humic acidhydrogelsecondary structurerheologydiffusion |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Martina Klucakova Jiri Smilek Petr Sedlacek |
spellingShingle |
Martina Klucakova Jiri Smilek Petr Sedlacek How Humic Acids Affect the Rheological and Transport Properties of Hydrogels Molecules humic acid hydrogel secondary structure rheology diffusion |
author_facet |
Martina Klucakova Jiri Smilek Petr Sedlacek |
author_sort |
Martina Klucakova |
title |
How Humic Acids Affect the Rheological and Transport Properties of Hydrogels |
title_short |
How Humic Acids Affect the Rheological and Transport Properties of Hydrogels |
title_full |
How Humic Acids Affect the Rheological and Transport Properties of Hydrogels |
title_fullStr |
How Humic Acids Affect the Rheological and Transport Properties of Hydrogels |
title_full_unstemmed |
How Humic Acids Affect the Rheological and Transport Properties of Hydrogels |
title_sort |
how humic acids affect the rheological and transport properties of hydrogels |
publisher |
MDPI AG |
series |
Molecules |
issn |
1420-3049 |
publishDate |
2019-04-01 |
description |
Humic acids are often regarded as substances with a supramolecular structure which plays an important role in Nature. Their addition into hydrogels can affect their behavior and functioning in different applications. This work is focused on the properties of widely-used hydrogel based on agarose after addition of humic acids–the protonated H-form of humic acids and humic acids with methylated carboxylic groups. Hydrogels enriched by humic acids were studied in terms of their viscoelastic and transport properties. Rotational rheometry and methods employing diffusion cells were used in order to describe the influence of humic acids on the properties and behavior of hydrogels. From the point of view of rheology the addition of humic acids mainly affected the loss modulus corresponding to the relaxation of hydrogel connected with its flow. In the case of diffusion experiments, the transport of dyes (methylene blue and rhodamine) and metal ions (copper and nickel) through the hydrogel was affected by interactions between humic acids and the diffusion probes. The time lag in the hydrogel enriched by humic acids was prolonged for copper, methylene blue and rhodamine. In contrast, the presence of humic acids in hydrogel slightly increased the mobility of nickel. The strongest influence of the methylation of humic acids on diffusion was observed for methylene blue. |
topic |
humic acid hydrogel secondary structure rheology diffusion |
url |
https://www.mdpi.com/1420-3049/24/8/1545 |
work_keys_str_mv |
AT martinaklucakova howhumicacidsaffecttherheologicalandtransportpropertiesofhydrogels AT jirismilek howhumicacidsaffecttherheologicalandtransportpropertiesofhydrogels AT petrsedlacek howhumicacidsaffecttherheologicalandtransportpropertiesofhydrogels |
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