Izvestiya of Saratov University.
ISSN 1817-3020 (Print)
ISSN 2542-193X (Online)


Нанотехнологии, наноматериалы и метаматериалы

Composite mesoporous vaterite-magnetite coatings on polycaprolactone fibrous matrix

Background and Objectives: Based on polymers and inorganic components, hybrid nanostructured materials are used in biomedicine, including tissue engineering and drug delivery with the controlled release. This research aims to develop the method for forming to composite coating formation of vaterite and MNPs on electrospun PCL fibers, which will maintain sensitivity to magnetic fields for a period for the use of magnetotherapy and for control the rate of drug release.

О МЕХАНИЗМЕ ПОВЫШЕНИЯ МЕХАНИЧЕСКИХ ХАРАКТЕРИСТИК ОТВЕРЖДЕННЫХ ПОЛИМЕРНЫХ КОМПОЗИЦИОННЫХ МАТЕРИАЛОВ ПОД ДЕЙСТВИЕМ СВЧ ЭЛЕКТРОМАГНИТНОГО ПОЛЯ

На основе комплексных экспериментальных исследований микроструктуры отвержденных полимерных композиционных материалов на эпоксидной матрице, установлено, что в матрице и межфазном слое при взаимодействии со сверхвысокочастотным электромагнитным полем, энергетические параметры которого не достигают значений, вызывающих деструкцию матричного материала, происходят изменения, способствующие увеличению количества областей контактного взаимодействия «матрица – волокно», в результате которого повышается связанность армирующих компонентов и равномерность перераспределения вн

Features of the atomic structure and electronic properties of hybrid films formed by single-walled carbon nanotubes and bilayer graphene

The combination of carbon nanotubes and graphene opens up wide opportunities for the production of nanomaterials with customizable properties and their application in the development of the element base of nanoelectronic devices. To control the properties of hybrid structures formed by graphene and nanotubes, it is important to understand the regularities of physical processes in them at the atomic level. Methods of computer modeling are an effective tool for solving this problem.

Fluorescent nanostructures based on folic acid and citrate: Synthesis and properties

The fluorescent properties of products obtained by the hydrothermal treatment of organic raw materials are of great interest. Such products are usually colloidal stability in water, have low cytotoxicity, and high photostability. One of their advantages is a wide choice of starting materials and the relative simplicity of synthesis. The use of folic acid as a precursor for fluorescent nanostructures opens up the possibility of targeted imaging. This article shows a one-step synthesis of fluorescent nanostructures from folic acid and citrates.

Особенности атомного строения и электронных свойств гибридных пленок, образованных одностенными углеродными нанотрубками и бислойным графеном

Сочетание углеродных нанотрубок и графена открывает широкие возможности для получения наноматериалов с настраиваемыми свойствами и их применения в разработке элементной базы наноэлектронных устройств. Для управления свойствами гибридных структур, образованных графеном и нанотрубками, важно понимать закономерности протекания в них физических процессов на атомарном уровне. Эффективным инструментом решения этой задачи являются методы компьютерного моделирования.

Effect of electric field pulses on the suspension of microcontainers based on organic polymer and magnetite nanoparticles

Abstract. Background and Objectives: Here, non-thermal effects induced in the suspension of hollow alginate silver microcontainers after application of short electric field pulses (about 1 ms) of high intensity (about 1 kV/cm) were studied as a prospective tool for remote activation of microcontainers. Materials and Methods: Alterations in microcontaner’s shells were studied as a function of their composition. Magnetic nanoparticles immobilized within microcontainer’s shells were found to enhance effects that occurred after the application of electric field pulses.

Effect of Small Doses of Gamma Radiation on the Optical Properties of Nanostructured Silicon Obtained by Metal-Stimulated Chemical Etching in situ

Background and Objectives: Porous silicon nanowires (SiNP) obtained by the method of metal stimulated chemical etching (EE method) are of great interest. The physical properties of this material depend significantly on the morphology of the nanostructures and their sizes. Given in the literature data on the effect of small doses of ionizing radiation on metals and alloys and the effect of irradiation on the properties of porous silicon and SiNP, makes sense to modify not only the substrate, but also the SiNP layer during its formation by irradiation.

Electrically induced opening of composite PLA/SWCNT microchambers for implantable drug depot systems

Time- and site-specific release of bioactive compounds mediated by microcontainers immobilized on a surface is of high importance in a variety of tasks related to biomedicine and functional coatings. In the present work, we investigate arrays of hollow microchambers formed by composite shells based on a polylactic acid matrix and single-walled carbon nanotubes filler with high responsiveness towards electric current stimuli. The monitoring of the morphology changes reveals significant damages to the shells of microchambers formed by conductive composite material.

Влияние малых доз гамма-излучения на оптические свойства наноструктурированного кремния, полученного методом металл стимулированного химического травления in situ

Исследованы оптические и структурные свойства образцов пористого кремния, полученных методом металл-стимулированного химического травления при облучении малыми дозами γ-квантов непосредственно в процессе его формирования in situ. Контроль in situ образцов указывает на влияние не только дозы облучения образующегося слоя на величину полного отражения, но и дозы предварительного облучения подложки.