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15The antimicrobial effect was evaluated by the degree of inhibition of bacterial growth at different incubation times compared to control samples. The results of the studies showed that a high growth of microorganisms was observed in the control samples. In the samples treated with solutions of titanium dioxide na-noparticles, a growth delay zone of E. coli microorganisms is observed in the range of 2-5 mm (Table 2). With an increase in the concentration of titanium dioxide na-noparticles, the antibacterial properties of polylactide packaging materials increase.
CONCLUSION
Titanium dioxide nanoparticles with a size of 148nm-2.01 microns were synthesized, and the size of the nanoparticles increases with increasing temperature and pH of the medium.
The results of the conducted studies have shown the effectiveness of the proposed antimicrobial composition based on titanium dioxide nanoparticles. The developed antimicrobial composition based on titanium dioxide nanoparticles for polylactide packaging materials prevents food spoilage by suppressing the development of microorganisms, which allows to increase the shelf life of food products.
REFERENCES:
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6. Mallakpour S., Jarang N. Production of bi-onanocomposites based on poly(vinylpyrrolidone) using modified TiO2 nanoparticles with citric acid and ascorbic acid and study of their physicochemical properties // Polym. Bull. 2018. V. 75. P.1441. https://doi.org/10.1007/ s00289-017-2100-5
7. Li W., Zhang C., Chi H. et al. Development of Antimicrobial Packaging Film Made from Poly(Lactic Acid) Incorporating Titanium Dioxide and Silver Nanoparticles // Molecules. 2017. 22. P. 1170. https://doi.org/10.3390/ molecules22071170
LINEN MATERIALS WITH ANTIBACTERIAL PROPERTIES MODIFIED WITH TITANIUM
DIOXIDE NANOPARTICLES
Sadykova M.
Master's degree student, Technology ofproduction of textile materials, Almaty Technological University
Tausarova B.
Doctor of Chemical Sciences, Professor, Chemical Technology and Ecology,
Almaty Technological University
Abstract
The work is devoted to giving antibacterial properties to textile materials to improve their hygienic characteristics by modifying them with titanium dioxide nanoparticles. A method for obtaining titanium dioxide nanoparticles by hydrolysis of titanium tetrachloride in an aqueous medium has been developed.
Keywords: nanoparticles, titanium dioxide, linen material, antibacterial properties
INTRODUCTION
The great attention shown in the world to nano-technology is largely determined by the possibility of directed modification of the physical and chemical properties of substances with a decrease in the particle size.
The study of new dimensional effects characteristic of nanomaterials and their quantitative determination require the development of scalable and reproducible methods for obtaining substances in nanostructured form.
A consequence of the development of nanotechnology is the creation of a variety of materials contain-
ing nanoscale particles. Currently, the industrial volume of production of various nanoproducts has already reached hundreds of thousands of tons.
Due to its high chemical inertness, lack of toxicity and low cost, titanium dioxide is increasingly being used, while it has a number of significant disadvantages: low quantum efficiency of the process due to weak electron-hole pair separation, limited absorption spectrum in the ultraviolet region, which makes it impossible to use the energy of sunlight. Scientists in all the leading countries of the world are engaged in solving these problems. [1-6].
Experimental part.
Objects of research: linen fabric and chemicals that can impart antibacterial and self-cleaning properties (titanium dioxide nanoparticles).
In the course of the investigation, the task was to obtain titanium dioxide nanoparticles that impart stable bactericidal and self-cleaning properties.
The purpose of this study is to create a calibration solution. To do this, we need half of the titanium dioxide nanoparticles with a narrow and measurable distribution in the proportions of particles in the nanoparti-cles, which implies optimizing the synthesis conditions and the concentration of reagents.
TiO2 Nanoparticles were prepared by hydrolysis of titanium tetrachloride TiCl4 in an alkaline medium, adjusting the pH value with an aqueous solution of ammonia (Table 1).
One of the most popular methods for producing nanoscale TiO2 particles is the hydrolysis of titanium-containing precursors, such as TiCl4, titanium alkoxides, or titanyl sulfate. Titanium dioxide nanoparticles
were obtained by hydrolysis of titanium tetrachloride TiCl4 in an alkaline medium, adjusting the pH value with an aqueous solution of ammonia at a temperature of 30°-70°. The resulting TiO2 nanoparticles depend on the pH of the synthesis. The spherical shape of the na-noparticles is affected by the environment and conditions of the synthesis. The resulting particles are stable and do not precipitate. Studies conducted by electron scanning microscopy confirmed the presence of na-noscale particles in the structure of the material. Optimal conditions for the synthesis of titanium dioxide na-noparticles and the processing of linen materials have been developed. The antimicrobial effect was evaluated by the degree of inhibition of bacterial growth at different incubation times compared to control samples. It was found that the modification of linen materials with the selected composition gives the antimicrobial properties of the treated fabric, improves the strength characteristics.
Table 1.
Concentration of the initial components
Samples Initial reagent (TiCU) pH Temperature (0C) HCl (1 h)/ H2O NH4OH
1 2.74 ml pH=2-7 T=30°C 9 ml/ 50 ml 18 ml
2 5.48 ml pH=2-7 T=30°C 9 ml/ 50 ml 18 ml
3 8.22 ml pH=2-7 T=30°C 9 ml/ 50 ml 18 ml
4 10.96 ml pH=2-7 T=30°C 9 ml/ 50 ml 18 ml
RESULTS AND DISCUSSION
In order to measure the size of nanoparticles and study their aggregate stability, we conducted studies using electron scanning microscopy JSM-6510LA. This method allows us to obtain the distribution of particles by size and shape, and also gives an idea of the location of nanoparticles in space. The study of the presented samples showed that nanoparticles of silver compounds
up to 5-100 nm in size are formed on the surface of the fibers.
Under the optimal conditions for the synthesis of titanium dioxide nanoparticles with pH=2-7; 10 minutes under microwave radiation with a power of 700 W, titanium dioxide nanoparticles were obtained, which were studied by electron scanning microscopy.
Picture 1. Photos of TiO2 NP obtained by ESM at pH 2-7, TiCl4=2,74 ml with a resolution of 4 nm, 20 nm and
100 nm (experiment-1)
The resulting nanoparticles (Pic.1) have a spherical shape, with a diameter of 250-300 nm. The spheri-
cal shape of the nanoparticles is affected by the environment and conditions of the synthesis. The resultng particles are stable and do not precipitate.
Picture 2. Photos of TiO2 NP obtained by ESMatpH 2-7, TiCl4=5.48 ml with a resolution of 4 nm, 20 nm and
100 nm (experiment-2)
The resulting nanoparticles have a spherical shape, with a diameter of 140-370 nm.(Pic.2)
Picture 3. Photos of TiO2 NP obtained by ESM at pH 2-7, TiCl4=8,22 ml with a resolution of 4 nm, 20 nm and
100 nm (experiment-3)
The resulting nanoparticles have a spherical shape, with a diameter of 400-530 nm.(Pic.3)
Picture 4. Photos ofTiO2 NP obtained by ESM at pH 2-7, TiCl4=10,96 ml with a resolution of 4 nm, 20 nm and
100 nm (experiment-4)
The resulting nanoparticles have a spherical shape, with a diameter of400-530 nm. (Pic.4)
Antimicrobial properties of linen materials modified with titanium dioxide nanoparticles.
A number of studies have been conducted to identify the antibacterial properties of NP titanium dioxide. To determine the effectiveness of antimicrobial finishing of textiles, microbiological studies of the effects of bacteria were conducted. The study was conducted in the ATU Research Laboratory for the assessment of the quality and safety of food products. The test was carried out with E. coli bacteria at a temperature of 210 ° C, humidity-81% . Tests of the tissue for resistance to fungi were carried out as follows. Samples of the original tissue and antimycotic-coated tissue were treated with a suspension of bacteria and placed in Petri dishes,
which, in turn, were placed in a desiccator with water to create the necessary humidity. Incubation was carried out at a temperature of 30 ° C for 42 hours.
Before the tests, the test cultures were sown on fresh Chapek medium to determine their viability. Incubation was carried out at a temperature of 24-26° C for 4 days. The results showed that in the control sample there was a significant growth of bacteria, in the experimental samples the growth of microorganisms significantly decreased.
CONCLUSION
1. The synthesis of titanium dioxide nanoparti-cles by hydrolysis of titanium tetrachloride is developed; the influence of the synthesis parameters pH of the medium, temperature and synthesis time on the formation of titanium dioxide nanoparticles is studied.
2. Using electron-scanning microscopy, it was found that titanium dioxide nanoparticles of various sizes are formed.
3. The method of treatment of linen fabrics with a solution of low-frequency titanium dioxide, which gives an antimicrobial effect, improves the bactericidal properties, is carried out;
4. It was revealed by microbiological studies that the antimicrobial effect at the level of bactericidal activity is the safest when tissues come into contact with human skin. No microbes or bacteria were found on the samples under study;
REFERENCES:
1. Costa S. M. et.al. Multifunctional Flax Fibres Based on the Combined Effect of Silver and Zinc Oxide
(Ag/ZnO) Nanostructures. Nanomaterials. 2018. 8. 1069.
2. Shahid-ul-Islam et.al. Facile synthesis of chi-tosan-silver nanoparticles onto linen for antibacterial activity and free-radical scavenging textiles. Int. J. Biol. Macromol. 2019. 133. 1134-114
3. Taussarova B. R., Suleimenovaa M. Sh., Baimakhanovb G. A. Development and Research of Packaging Paper Modified by Titanium Dioxide Nanoparticles. Nanotechnologies in Russia. 2019. Vol. 14, Nos. 11-12, p. 565-571.
4. He C., Chen Q., Yarmolenko M.A.et al. Structure and antibacterial activity of PLA-based biodegradable nanocomposite coatings by electron beam deposition from active gas phase. Prog. Org. Coat. 2018. V.123.P. 282-291.
5. Mallakpour S., Jarang N. Production of bi-onanocomposites based on poly(vinylpyrrolidone) using modified TiO2 nanoparticles with citric acid and ascorbic acid and study of their physicochemical properties // Polym. Bull. 2018. V. 75. P.1441. https://doi.org/10.1007/ s00289-017-2100-5
IMPARTING BIOCIDAL PROPERTIES TO INSULATING MATERIALS MADE OF LINEN FIBRES
Ertas A. Burkitbay A. Niyazbekov B. Tausarova B.
Almaty Technological University, Almaty, Republic of Kazakhstan
Abstract
In this work, salicylic acid and copper sulfate were chosen as antimicrobial agents to impart biocidal properties to nonwoven materials. The conditions of the antibacterial finishing process were as follows: the aqueous solution of a biocidal composition of different concentration was applied by spraying to the surface of the material, then the drying and heat treatment was carried out at 180°C on the thermal conductor. A microbiological study was conducted to study the fungicidal activity of the treated material.Tests were also carried out on the toxic and dermal effects of non-woven material treated with salicylic acid and copper sulfate and demonstrated its safety to human health.
Keywords: Textile Material, Nonwoven Material, Biocidal Substance, Microorganisms, Salicylic Acid, Copper Sulfate, Microbiological Study.
Introduction
The incorporation of antimicrobial additives in various materials not only protects them from exposure to microorganisms under critical operating conditions, but also makes it possible to impart antimicrobial properties to goods, such as resistance to pathogenic organisms.
There are various ways to create textile materials with biocidal properties with the use of antibacterial drugs:
- introduction of antibacterial agents into the polymer-forming substance;
- imparting antimicrobial properties to textile materials at the final stages of dyeing and finishing;
- the use of biocidal substances in the washing or cleaning of textile materials and products.
This study focuses on the treatment of non-woven materials during emulsion or after the canvas is formed by spraying with an antimicrobial solution. Nonwoven
materials with biocidal properties are used in construction as insulating materials. There is also evidence of the use of non-woven materials with antimicrobial activity as floor coverings in hospitals, schools, sanatoriums, kindergartens, hotels, and other public institutions, as well as in everyday life.
Wrapping and packaging materials with antimicrobial properties are of great practical importance. They provide long-term preservation of packaged items, which can find great use in trade, especially foreign trade.
Antimicrobial cloths are also very useful for technical purposes, in particular, as filter materials. Filters with antimicrobial properties can be used for disinfection of fresh water, as preservatives of fruit juices. Bacterial air filters are required for air conditioning and ventilation in hospitals, various microbiological laboratories. The requirement for the sterility of process air arises in the production of various pharmaceutical and
