Nonmonotonic (in concentration) conductivity of aqueous solutions of fungal melanin
The conductivity of aqueous (distilled and natural water) solutions of fungal melanin (purified and non-purified) has been studied. It has been shown that, in the presence of impurities, the conductivity of solution increases (for the concentration 0.1 wt% about an order of magnitude). On the concen...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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National Academy of Sciences of Ukraine. Institute of Semi conductor physics.
2018-03-01
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| Series: | Semiconductor Physics, Quantum Electronics & Optoelectronics |
| Subjects: | |
| Online Access: | http://journal-spqeo.org.ua/n1_2018/P095-099abstr.html |
| Summary: | The conductivity of aqueous (distilled and natural water) solutions of fungal melanin (purified and non-purified) has been studied. It has been shown that, in the presence of impurities, the conductivity of solution increases (for the concentration 0.1 wt% about an order of magnitude). On the concentration dependences of the melanin conductivity within the range of 0.0001 to 1 wt.% at least three particular sections have been detected. It was suggested that the presence of such sections is caused by three types of aggregation of melanin molecules: aggregation of several (mostly oppositely charged) molecules under the lowest melanin concentration, formation of nanoscale melanin clusters for the concentration of 0.002 to 0.06 wt.% and formation of micelles, when the melanin concentration is higher than 0.1 wt.%. |
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| ISSN: | 1560-8034 1605-6582 |