Thermal Decomposition of Co-Doped Calcium Tartrate and Use of the Products for Catalytic Chemical Vapor Deposition Synthesis of Carbon Nanotubes.

Thermal decomposition of Co-doped calcium tartrate in an inert atmosphere or air was studied using thermogravimetric analysis and X-ray absorption fine structure (XAFS) spectroscopy. It was shown that the powder substance containing 4 at.% of cobalt completely decomposes within 650-730 °C, depending on the environment, and the formation of Co clusters does not proceed before 470 °C. The products of decomposition were characterized by transmission electron microscopy, XAFS, and X-ray photoelectron spectroscopy. Surfaceoxidized Co metal nanoparticles as large as ∼5.6 ( 1.2 nm were found to form in an inert atmosphere, while the annealing in air led to a wide distribution of diameters of the nanoparticles, with the largest nanoparticles (30-50 nm) mainly present as a Co3O4 phase. It was found that the former nanoparticles catalyze the growth of CNTs from alcohol while a reducing atmosphere is required for activation of the latter nanoparticles. We propose the scheme of formation of CaO-supported catalyst from Co-doped tartrate, depending on the thermal decomposition conditions

Місцева реакція тканин на поліпропіленовий сітчастий ендопротез при його імплантації в тканини передньої черевної стінки і можливі шляхи її зменшення.

Background. In Ukraine surgical intervention because of hernia re-present 8-10% among other operations. Significant deficiency of any graft material is a manifestation of the local inflammatory process that occurs in response to the implantation of foreign material into the body. In this regard the development of synthetic materials which will cause a minor inflammatory response while maintaining a satisfactory strength characteristics and manufacturing cost. Objective. To experimentally approve the possibilities of processing the grafts with autogenous blood plasma and cattle cerebrospinal fluid for the reduction of tissue inflammatory reaction. Methods. 36 adult male rats were operated under ether narcosis with implantation of a polypropylene mesh endoprosthesis Alfa Vita 90 into anterior abdominal wall. Animals were divided into 2 groups: control, where grafts were processed with autogenic blood plasma, and experimental, with grafts processed with cattle cerebrospinal fluid. After 7, 14, 21 and 28 days after operation fragments of anterior abdominal wall were taken for histological analysis. Results. Intensity of local aseptic inflammatory reaction around the elements of the polypropylene mesh prosthesis in all terms was more intensive in the control group with continuous amplification till the 28th day after surgical intervention. While in experimental animals on the 28th day after graft implantation inflammatory signs were not visualized. Conclusion. Processing of polypropylene mesh implants with autologous blood plasma and cattle cerebrospinal fluid reduces the local inflammatory reaction after implantation in the anterior abdominal wall, decreasing the risk of local complications in the postoperative period.Целью исследования было экспериментальное обоснование обработки полипропиленовых сетчатых эндопротезов аутогенной плазмой крови и цереброспинальной жидкостью крупного рогатого скота для уменьшения воспалительной реакции окружающих тканей. Установлено, что полипропиленовые имплантаты, обработанные аутогенной плазмой крови и цереброспинальной жидкостью крупного рогатого скота, вызывают менее выраженную воспалительную реакцию окружающих тканей, чем имплантаты без предварительной обработки.Метою дослідження було експериментальне обґрунтування обробки поліпропіленових сітчастих ендопротезів аутогенною плазмою крові і цереброспінальною рідиною великої рогатої худоби для зменшення запальної реакції оточуючих тканин. Встановлено, що поліпропіленові імплантати, оброблені аутогенною плазмою крові і цереброспінальною рідиною великої рогатої худоби, викликають менш виражену запальну реакцію оточуючих тканин, ніж імплантати без попередньої обробки