Электроимпульсные методы синтеза биоцидных сред

1. Параметры установки: 1. Выходное напряжение 5÷10 кВ 2. Частота следования импульсов 1100 Гц 3. Энергия импульса 110 Дж 4. Амплитуда импульса тока 0.55 кА 5. Длина фронта импульса тока 1÷10 мкс 6. Производительность реактора 4 л/ч Moscow State AviationTechnological Universitynamed after K.E.TsiolkovskyMoscow State Instituteof Steel and Alloys Электроимпульсные методы синтеза биоцидных сред Слепцов ВВ Тянгинский АЮ Голубев ВН Саульский ДВ МоденовВА 2012

2. Introduction Investigation of metal clusters is one of most rapidly developing field of nanotechnology. The most promising are the clusters with size in the range 1nm to 10nm. We introduce a method of synthesis of nanoparticles in liquid medium without the use of any nanoparticles of impurities. For example, a pure metal and water are basic components for the synthesis of silver. Company Logo

3. The ratio of surface area to volume

4. The technology for obtaining nanoparticlesby a pulsed electric discharge in liguid Apparatus diagram. The mechanism of dispersion using the method of electric discharge 1,2 – electrodes, 3 – molten metal of electrodes, 4 – vapours ofliquidand metal, 5 – direction of propagation of the shock wave, 6 – metal nanoparticles, 7 – metal microparticles. Company Logo

5. Installation for the synthesis of metal nanoparticles in a liquid medium

6. Electrodes Structures of different electrodes a) b) Electrodes roughness. Photos obtained by using an optical microscope at 40X increase а) b) Company Logo

7. Supply circuit of reactor. Supply circuit. Graph of the discharge current. The surface of the positive electrode after a single discharge pulse (series of decaying pulses) Company Logo

8. Modes of the reactorwith the different capacity of capacitor. Company Logo

9. Concentration measurement The method 1 Direct measurement of concentration. Vaporization of colloidal solutionwith further weighing solid residue on an analytical balance Ohaus RV-64. This method is used as a "benchmark" method. All other methods are calibrated with respect to this method. The method 2 Express method for measuring concentration. Based on measurements of the attenuation of the laser beam passing through the solution. The system consists of a laser, photodetector and a multimeter. The method3 Measuring the concentration using the method of particle counting method (based on the opalescence). The system consists of a laser, a microscope with a camera and image-processing program ScopePhoto. 1. Cuvette with a solution 2. Laser 3. Power supply for laser 4. Microscope 5. Digital camcorder 6. PC + program for image processing Company Logo

10. Colloidal solutions obtained on the equipment Characteristics of the colloidal silver solutionConcentration of the solution (stable): 80 mg / lDispersity: 5-10 nm.Solution has biocidal properties The materials of which were successfully obtained colloidal solutions Ag, Ni, Co, Cu, Zr, Ti, W, Fe, Pt, ZnO, C A snapshot from the TEM, the typical size of nanoparticles in colloidal soluti Environment in which the prepared colloidal solutions:- Distilled water- Alcohol- Dodecane- A solution of gelatin in water- Petroleum ether 70-100- PET-1500 solution in water- A solution of PVA in water- A solution of sodium dodecyl sulfate in water - The distribution of particles in solution was obtained by measuring complex Malvern Zetasizer nano ZS Change the color of the colloidal solution of impurities . Various colloidal solution

11. Biocide characteristics Control populations of Listeria After one and a half hour of interaction with silver solution Before processing Biological activity of silver nanoparticles is confirmed by the example of the suppression of growth of vegetative and spore-forming bacteria and increase seed germination. Company Logo *- decrease the intensity of culture growth **- significant reduction in the intensity of the culture growth

12. Biocide characteristics HIV-1 with fixed nanoparticles of silver. Picture made by dark-field method with using a transmission electron microscope. Company Logo

13. Effect of silver nanoparticles on the structure of E.Coli cell Biocide characteristics a – E.Coli cell b – E.Coli cellexposed to the effects of silver nanoparticles Company Logo

14. Application of metal nanoclusters Influence of nanoparticles of silver and cobalt on the growth of wheat seedlings at different times after pre-soaking treatment 1 - Soak seeds in water 2 - Soak seeds in a liquid with silver nanoparticles 3 - Soak seeds in a liquid with cobalt nanoparticles Company Logo

15. Application of metal nanoclusters Picture 7 – Influence of nanoparticles of silver and cobalt on the growth of beet seedlings after pre-soaking treatment at 9 day. 1 - Soak seeds in water 2 - Soak seeds in a liquid with silver nanoparticles 3 - Soak seeds in a liquid with cobalt nanoparticles Company Logo

16. Application of metal nanoclusters Application of metal nanoclusters for textile Company Logo

17. Packaging for food Company Logo

18. Antibacterial treatmentof objects of public use Handling objects of public transport Company Logo

20. Thank you for your attention !