PHASE BEHAVIOR AND RHEOLOGICAL PROPERTIES OF SUPRAMOLECULAR SYSTEMS BASED ON A SURFACTANT WITH "YELLOW" CARBON DOTS
Rubrics: 1. CHEMISTRY
Authors:
1.
KNITU
2.
Kazan National Research Technological University
(physical and colloid chemistry department)
graduate student from 01.01.2022 until now
Russian Federation
graduate student from 01.01.2022 until now
Russian Federation
3.
KNITU; KNITU
Type:
Article
Pages:
from 24
to 30
Status:
Published
Received:
19.01.2026
Accepted:
25.01.2026
Published:
26.02.2026
Language:
Russian
Keywords:
LYOTROPIC LIQUID CRYSTALS, PHASE BEHAVIOR, CARBON DOTS, VISCOSITY, RHEOLOGICAL MODEL
Funding:
Rabota vypolnena za schet granta, predostavlen-nogo Akademiey nauk Respubliki Tatarstan obrazovatel'nym organizaciyam vysshego obrazovaniya, nauchnym i inym organizaciyam na podderzhku planov razvitiya kadrovogo potenciala v chasti stimulirovaniya ih nauchnyh i nauchno-pedagogicheskih rabotnikov k zaschite doktorskih dissertaciy i vypolneniyu nauchno-issledovatel'skih rabot (soglashenie №10/2025-PD-KNITU ot 22.12.2025).
Abstract:
Self-organizing lyotropic liquid crystalline matrices are promising for biomedicine as universal carriers for hydrophilic and hydrophobic substrates. In recent years, research has been intensively developing towards their functionalization with various dopants, particularly carbon dots possessing luminescent properties, enabling the creation of hybrid systems with biosensory capabilities for theranostics. For practical application of such systems as theranostic platforms, knowledge of the conditions for controlling their phase states is necessary. The study presents phase diagrams of multifunctional hybrid systems based on the nonionic surfactant tetraethylene glycol monododecyl ether, decanol, and an aqueous solution containing luminescent "yellow" carbon dots. Temperature-concentration parameters for controlling the supramolecular structure of the obtained hybrid media were established. The viscosity and rheological properties of the hybrid media were investigated in the regions of lyomesophase and gel formation. Analysis of rheological curves revealed that the viscosity of lyotropic liquid crystalline phases in both types of systems-hybrid systems with "yellow" carbon dots and base oligoethylene oxide-based systems-exceeds the viscosity of the corresponding gel-like media. The flow behavior of the C12EO4/(H2O+yCD)/dec hybrid systems was analyzed within the framework of the Newtonian, Bingham, Ostwald, Casson, and Herschel-Bulkley micro-rheological models. It was found that the flow of hybrid lyotropic liquid crystals follows the Casson model, while the gel-like systems conform to the Ostwald model. The work demonstrates approaches for regulating the composition and viscous characteristics of such systems, which opens possibilities for developing effective nanodrug delivery systems and their further application in bioimaging, theranostics, and targeting various biosubstrates.
Self-organizing lyotropic liquid crystalline matrices are promising for biomedicine as universal carriers for hydrophilic and hydrophobic substrates. In recent years, research has been intensively developing towards their functionalization with various dopants, particularly carbon dots possessing luminescent properties, enabling the creation of hybrid systems with biosensory capabilities for theranostics. For practical application of such systems as theranostic platforms, knowledge of the conditions for controlling their phase states is necessary. The study presents phase diagrams of multifunctional hybrid systems based on the nonionic surfactant tetraethylene glycol monododecyl ether, decanol, and an aqueous solution containing luminescent "yellow" carbon dots. Temperature-concentration parameters for controlling the supramolecular structure of the obtained hybrid media were established. The viscosity and rheological properties of the hybrid media were investigated in the regions of lyomesophase and gel formation. Analysis of rheological curves revealed that the viscosity of lyotropic liquid crystalline phases in both types of systems-hybrid systems with "yellow" carbon dots and base oligoethylene oxide-based systems-exceeds the viscosity of the corresponding gel-like media. The flow behavior of the C12EO4/(H2O+yCD)/dec hybrid systems was analyzed within the framework of the Newtonian, Bingham, Ostwald, Casson, and Herschel-Bulkley micro-rheological models. It was found that the flow of hybrid lyotropic liquid crystals follows the Casson model, while the gel-like systems conform to the Ostwald model. The work demonstrates approaches for regulating the composition and viscous characteristics of such systems, which opens possibilities for developing effective nanodrug delivery systems and their further application in bioimaging, theranostics, and targeting various biosubstrates.
Keywords:
LYOTROPIC LIQUID CRYSTALS, PHASE BEHAVIOR, CARBON DOTS, VISCOSITY, RHEOLOGICAL MODEL
LYOTROPIC LIQUID CRYSTALS, PHASE BEHAVIOR, CARBON DOTS, VISCOSITY, RHEOLOGICAL MODEL
