Nanoscale Apatite Biomaterials for Osteointegration

The thermal behavior of bone tissue has been investigated in order to assess how it is affected struc-turally by incineration. The need of the development of such technology is caused by big number of pa-tients with oncology and dystrophic bone tissue diseases which use the artificial bone tissue replacement. The samples like small plates that cut from local area of bone fragment, were exposed to annealing in tem-perature range 560-720 C and were characterized by XRD, SEM, EPMA, XPS and method of differential dissolution. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3547

The Study of the Influence of Static Magnetic Field on Brushite Crystallization in the Presence of Magnesium

The paper describes the influence of the imposition of static magnetic field on brushite crystallization. Two different configurations of the magnetic field were used. The flasks with the precipitates were placed near the different poles. It was shown that changing the magnetic field configuration and positioning the samples in proximity to north or south poles can greatly affect their crystallinity and texture with most of them having the preferred orientation along the b-axis according to the X-Ray diffraction data. The imposition of the magnetic field also influences the microstrain ratio decreasing it significantly. It was also verified [1] that the Mg substrate availability decreases the crystallinity of DCPD. The micrographs of the nanoparticles with the different magnifications were obtained by the transmission electron microscopy (TEM). The comparative analysis of the electron microscopy data correlates with the XRD data. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3546

Structural Properties of the Nanocrystallized Magnetite of Different Syntheses

Transmission electron microscopy (TEM) with electronic diffraction and X-ray diffraction (XRD) was used to study structural features of nanosized magnetite Fe3O4, which was synthesized using polymeric matrices (polysaccharide chitosan, at alias). From the received data it was revealed that growth inhibition and size stabilization of Fe3O4 nanoparticles were strongly affected by polysaccharide matrix. It was also observed that directional size decrease of Fe3O4 nanoparticles was accompanied by the increasing defectiveness of crystal lattice and decreasing unit cell size. The effectiveness of complementary use of both TEM with electronic diffraction and XRD techniques for structural and substructural parameters determination while studying magnetite nanosized particles synthesized in polysaccharide matrices is shown in this paper. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3545

Structural Properties of the Nanocrystallized Magnetite of Different Syntheses

Transmission electron microscopy (TEM) with electronic diffraction and X-ray diffraction (XRD) was used to study structural features of nanosized magnetite Fe3O4, which was synthesized using polymeric matrices (polysaccharide chitosan, at alias). From the received data it was revealed that growth inhibition and size stabilization of Fe3O4 nanoparticles were strongly affected by polysaccharide matrix. It was also observed that directional size decrease of Fe3O4 nanoparticles was accompanied by the increasing defectiveness of crystal lattice and decreasing unit cell size. The effectiveness of complementary use of both TEM with electronic diffraction and XRD techniques for structural and substructural parameters determination while studying magnetite nanosized particles synthesized in polysaccharide matrices is shown in this paper. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3545

The study of the oxide coating effect on bone–implant interface formation by means of electron microscopy method with energy dispersive x-ray analysis

The experimental results of the measurement of the tissue constituent elements distribution, as well as impurity elements in the tissues around a Ti-implant with protective TiO₂ oxide coating are presented. Study of morphology, qualitative and quantitative analysis were carried out by means of scanning electron microscopy method with energy dispersive X-ray analysis. The results show weak migration of Ti into the bone tissue near the interface and protective role of the oxide coatings.Представлено експериментальні результати дослідження розподілу елементів, що входять до складу кісткової тканини та слідів елементів у тканинах навколо титанового імплантату з захисним покриттям ТiO₂. Дослідження морфології, кількісний та якісний аналіз проводили за допомогою методу скануючої електронної мікроскопії з рентгенівським мікроаналізом. Результати показали слабку міграцію титану в кісткову тканину біля інтерфейсу та біосумісність оксидних покриттів.Представлены экспериментальные результаты исследования распределения элементов, составляющих костную ткань и примесей элементов в тканях вокруг титанового имплантата с защитным покрытием ТiO₂. Изучение морфологии, количественный и качественный анализ проводили с помощью метода сканирующей электронной микроскопии с рентгеновским микроанализом. Результаты показали слабую миграцию титана в костную ткань возле интерфейса и биосовместимость оксидных покрытий

Structural and electrical properties of ZnS/CdTe and ZnTe/CdTe heterostructures

We investigated the structural, substructural and electrical properties of ZnS/CdTe and ZnTe/CdTe heterostructures obtained by the close-spaced vacuum sublimation. It was found that the structural properties of CdTe and ZnTe thin films deposited on ZnS or CdTe sublayers are better than those of the films obtained on glass substrate at the same growth conditions. XRD-analysis has shown that Zn(x)Cd(1- x)Te(x = 0.21-0.30) solid solutions having the cubic phase were formed near the films’ interfaces. Furthermore, the saturation current, the ideality factor and the value of the potential barrier height were determined by the analysis of dark currentevoltage characteristics. This makes it possible to establish optimal growth conditions of ZnS/CdTe heterojunctions. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3016

Формирование нанокристаллического гидроксиапатита в присутствии некоторых аминокислот

Було досліджено вплив трьох амінокислот на формування гідроксиапатиту in vitro у м’яких умо- вах синтезу. Отриманий мінерал було охарактеризовано за допомогою просвічуючої електронної мік- роскопії та порошкової рентгенівської дифрактрометрії. Експеримент свідчить, що додавання цих амінокислот має істотний вплив на фазовий склад, розмір кристалітів та мікродеформації решітки отриманого кальцій-фосфатного мінералу.Исследовано влияние трех аминокислот на формирование гироксиапатита in vitro при мягких условиях синтеза. Полученный минерал был охарактеризован с помощью просвечивающей электрон- ной микроскопии и порошковой рентгеновской дифрактометрии. Эксперимент свидетельствует, что добавление этих аминокислот оказывает существенное влияние на фазовый состав, размер кристал- литов и микродеформации решетки полученного кальций-фосфатного минерала.The influence of three amino acids on the hydroxyapatite formation in vitro under mild condition was investigated. The mineral obtained was studied by transmission electron microscopy and powder X-ray diffraction. The experiments suggest that the addition of these amino acids has a significant effect on the phase composition, crystal size and lattice microstrains of the resulting calcium phosphate mineral