Creating Carbon Nanotubes Microenvironment in Surfactant Water Solutions

2020

SSP

Self Cite

Method of carbon nanotubes disaggregation with the help of protein material, gelatin, has been proposed which facilitate to disperse evenly nanotubes in hydrogels based on gelatin and polysaccharides (sodium alginate or κ-carrageenan). In the obtained composite hydrogels carbon nanotubes are located in the biopolymer matrix, i.e. being in biocompatible form without losing their unique properties. The removal of water from the pores of the hydrogel by means of freeze drying allowed to obtain materials having high porosity and with included carbon nanotubes. The produced hydrogels can be used to create eco-friendly composite materials for biomedical and technical purposes. Depending on the tasks the developed systems can also be used in the forms of xerogel (films), cryogel, aerogel, and even in the form of powder, containing carbon nanotubes.

Section: Applied Approachesmentioning

confidence: 77%

Use of Natural Biopolymers to Create Nanocomposite Materials

Makarova

Bogdanova

2020

SSP

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“…Numerical calculations are performed using the example of one of the most studied anionic surfactants -sodium dodecyl sulfate (SDS). The choice of this surfactant was dictated by our experience in studying SDS solutions [5,6] and phenomena occurring on the surfaces of carbon nanotubes dispersed in these solutions [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Modified method of conductometric data analysis to calculate the conductivity of surfactant ions

2019

E3S Web Conf.

Methodology for simple analytical refinement of the equivalent electrical conductivities of surfactant ions and counterions was proposed in the framework of the Debye -Hückel -Onsager theory as applied to surfactant dispersions at various concentrations. The developed methodology is based on the use of the mathematical form for the concentration dependencies of the specific conductivity in the premicellar region and makes it possible to calculate the equivalent conductivities of surfactant ions both under infinite dilution conditions and near the CMC. One of the advantages of the described method is the possibility of calculating the ion conductivities in the presence of a minimum number of experimental points (formally, a straight line can be constructed and its tangent of the angle of inclination can be determined even by two points corresponding to region 0.2 CMC -0.8 CMC). Using the values of the equivalent conductivities of surfactant ions and counterions calculated for the required concentrations, allows to determine the parameters of the solution more accurately, including the contribution of micelles to the total conductivity of the solution.

“…The processes occurring in anionic surfactants solutions in the absence [15] and at the dispergation of multi-walled carbon nanotubes of the carbon nanomaterial Taunit were investigated by us in [16,17] including the determination of the type of dominant mechanisms of interaction of surfactants with carbon surface. The dynamic processes occurring near CNT surface at the adsorption of surfactants molecules and their self-aggregation into different structures were studied by NMR and infrared spectroscopy methods.…”

Section: Introductionmentioning

confidence: 99%

Carbon Nanotubes Microenvironment in Ionic Surfactant Water Solutions

Mongush

Makarova

2018

SSP

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The processes of aggregation of anionic (SDS) and cationic (CTAB) molecules into supramolecular formations and the effect of carbon nanotubes on the processes were investigated by conductometry and tensiometry methods. Concentration dependences of the specific electrical conductivity and surface tension of aqueous SDS and CTAB dispersions and suspensions of carbon nanotubes of the carbon nanomaterial Taunit in these dispersions were obtained. A conclusion on the change in the conformation of CTAB micelles in the presence of carbon nanotubes was drawn. A significant increase in the packing density of CTAB molecules and their ordering in the monomolecular layer at the water-air interface in the presence of carbon nanotubes was shown. In particular, this makes it possible to control the properties of the surfactant surface layer by means of carbon nanotubes.