Study of internal stresses in aluminum layers evaporated on dielectric surfaces

Analysis  of  internal  stresses  in  evaporated  aluminum  layers  formed  at  various  sputtering  regimes  is  demonstrated.  Dependences  of  internal  stresses  on  the  thickness of aluminum films deposited at various substrate temperatures and evaporation  rates are studied.

Humidity sensing elements based on nanostructured Al2O3 membranes

The volumetric-surface variant of the capacitive MDM (metal-dielectric- metal) structure of the vertical direction based on high-ordered matrices of free anodic porous alumina membranes for applications in humidity sensing elements was designed. The improved humidity sensitivity, reduced response and recovery time over a wide humidity range were obtained due to preparing of alumina membranes with open-ended and widened pores without the barrier layer. Such technological approach allows to eliminate the effect of the electrolyte anions embedded in pore walls on the adsorption and desorption processes in humidity sensing elements

The electrical insulation strength of anodic Al2O3 coatings with vias for power multichip modules

The technological methods and regimes to improve the electrical insulation strength of anodic Al2O3 in vias of double-sided alumina bases for potential use in power multichip modules were discussed. It was shown that after using of the appropriate technological approaches the breakdown voltages of the obtained test samples were up to ~6 kV on working surfaces without holes and up to ~2,5 kV in vias

Wettability properties of porous Al2O3 coatings: effects of technological regimes and surface morphology

The comparative analysis of Al2O3 coatings and effect of surface morphology on the wettability properties were discussed. It was shown that it is possible to obtain high hydrophilic parameters with a contact angle value up to 17–20° using high values of current density, anodizing time, and electrolyte temperature by adjusting the electrochemical conditions. It was seen that this type of modified Al2O3 structures provides direct experimental evidence for the theory of threedimensional capillaries regarding superhydrophilicity

Releasing dye encapsulated in proteinaceous microspheres on conductive fabrics by electric current

The current paper reports on the relase properties of conductive fabrics coated with proteinaceous microspheres containing a dye. The release of the dye was achieved by passing an electric current through the fabric. The conductivity of the polyester fibers resulted from nanosilver (Ag NPs) coated on the surface of these fibers. Both types of coatings (nanosilver coating and the coating of the proteinaceous microspheres) were performed using high-intensity ultrasonic waves. Two different types of dyes, hydrophilic RBBR (Remazol Brilliant Blue R) and hydrophobic ORO (Oil Red O), were encapsulated inside the microspheres (attached to the surface of polyester) and then released by applying an electric current. The Proteinaceous Microsphere (PM)-coated conductive fabrics could be used in medicine for drug release. The encapsulated dye can be replaced with a drug that could be released from the surface of fabrics by applying a low voltage

Electrochemical behaviour of Ti/Al2O3/Ni nanocomposite material in artificial physiological solution: Prospects for biomedical application

Inorganic-based nanoelements such as nanoparticles (nanodots), nanopillars and nanowires, which have at least one dimension of 100 nm or less, have been extensively developed for biomedical applications. Furthermore, their properties can be varied by controlling such parameters as element shape, size, surface functionalization, and mutual interactions. In this study, Ni-alumina nanocomposite material was synthesized by the dc-Ni electrodeposition into a porous anodic alumina template (PAAT). The structural, morphological, and corrosion properties were studied using x-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscopy (AFM), and electrochemical techniques (linear sweep voltammetry). Template technology was used to obtain Ni nanopillars (NiNPs) in the PAAT nanocomposite. Low corrosion current densities (order of 0.5 μA/cm2) were indicators of this nanocomposite adequate corrosion resistance in artificial physiological solution (0.9% NaCl). A porous anodic alumina template is barely exposed to corrosion and performs protective functions in the composite. The results may be useful for the development of new nanocomposite materials technologies for a variety of biomedical applications including catalysis and nanoelectrodes for sensing and fuel cells. They are also applicable for various therapeutic purposes including targeting, diagnosis, magnetic hyperthermia, and drug delivery. Therefore, it is an ambitious task to research the corrosion resistance of these magnetic nanostructures in simulated body fluid. © 2020 by the authors. Licensee MDPI, Basel, Switzerland.Government Council on Grants, Russian FederationBelarusian Republican Foundation for Fundamental Research, BRFFR: Ф18Д-00720163522Funding: The work was performed with support of State Scientific and Technical Program “Nanotech” (ГБЦ No 20163522), Belarusian Republican Foundation for Fundamental Research (Grant No. Ф18Д-007), Act 211 of Government of Russian Federation (contract No. 02.A03.21.0011). Additionally, the work was partially supported by the Grant of World Federation of Scientists (Geneva, Switzerland)

ТЕХНОЛОГИЧЕСКИЕ ОСОБЕННОСТИ ФОРМИРОВАНИЯ ПЛАТ СО ВСТРОЕННОЙ СИСТЕМОЙ МЕЖСОЕДИНЕНИЙ В ПОДЛОЖКАХ АНОДНОГО

Results of the interconnection system formation during substrate anode alumina processing are presented. It is proved that anode Al2O3 substrate, interconnection system in the bulk and contact pads formation is possible simultaneously. The thickness of the anode Al2O3 substrate, the distribution of the interconnection system in its volume, the sizes of the conducting tracks and pads are specified by the method of the concrete board fabrication. It is possible to connect outboard or formed on the substrate surface later elements of integrated circuits with use external outputs with interconnection system.Изложен результат исследований создания системы межсоединений в процессе формирования подложки анодного оксида алюминия. Варьируя параметрами процесса анодирования и последовательностью технологических операций можно одновременно формировать подложку Al2O3 и систему межсоединений в ее обьеме с выводом на поверхность контактных площадок. Толщина подложки анодного Al2O3, расположение системы межсоединений в ее объеме, размеры проводящих дорожек и площадок задаются в методике изготовления конкретной платы. С помощью внешних выводов к этой системе межсоединений можно подсоединить навесные или формируемые в дальнейшем на поверхности подложки элементы микросхемы

Electrochemical alumina technology for power electronics devices

Обсуждается электрохимическая алюмооксидная технология для формирования теплопроводящих подложек алюминия с диэлектрическим слоем анодного оксида алюминия с пробивными напряжениями выше 6 кВ. Разработанная технология может быть использована при создании практически любого радиоэлектронного устройства для работы в области температур от 10 до 473 К и частот гигагерцового диапазона. The electrochemical alumina technology (ELAT) for the formation of heat-conducting aluminum substrates with a dielectric layer of anodic aluminum oxide with breakdown voltages above 6 kV is discussed. The developed technology can be used in the production of any electronic device operated in the temperature range from 10 to 473 K and frequencies of the gigahertz range

ЭЛЕКТРОХИМИЧЕСКАЯ АЛЮМООКСИДНАЯ ТЕХНОЛОГИЯ ДЛЯ ПРИБОРОВ СИЛОВОЙ ЭЛЕКТРОНИКИ

The electrochemical alumina technology (ELAT) for the formation of heat-conducting aluminum substrates with a dielectric layer of anodic aluminum oxide with breakdown voltages above 6 kV is discussed. The developed technology can be used in the production of any electronic device operated in the temperature range from 10 to 473 K and frequencies of the gigahertz range.Обсуждается электрохимическая алюмооксидная технология для формирования теплопроводящих подложек алюминия с диэлектрическим слоем анодного оксида алюминия с пробивными напряжениями выше 6 кВ. Разработанная технология может быть использована при создании практически любого радиоэлектронного устройства для работы в области температур от 10 до 473 К и частот гигагерцового диапазона

Electrochemical behaviour of Ti/Al2O3/Ni nanocomposite material in artificial physiological solution: Prospects for biomedical application

Inorganic-based nanoelements such as nanoparticles (nanodots), nanopillars and nanowires, which have at least one dimension of 100 nm or less, have been extensively developed for biomedical applications. Furthermore, their properties can be varied by controlling such parameters as element shape, size, surface functionalization, and mutual interactions. In this study, Ni-alumina nanocomposite material was synthesized by the dc-Ni electrodeposition into a porous anodic alumina template (PAAT). The structural, morphological, and corrosion properties were studied using x-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscopy (AFM), and electrochemical techniques (linear sweep voltammetry). Template technology was used to obtain Ni nanopillars (NiNPs) in the PAAT nanocomposite. Low corrosion current densities (order of 0.5 μA/cm2) were indicators of this nanocomposite adequate corrosion resistance in artificial physiological solution (0.9% NaCl). A porous anodic alumina template is barely exposed to corrosion and performs protective functions in the composite. The results may be useful for the development of new nanocomposite materials technologies for a variety of biomedical applications including catalysis and nanoelectrodes for sensing and fuel cells. They are also applicable for various therapeutic purposes including targeting, diagnosis, magnetic hyperthermia, and drug delivery. Therefore, it is an ambitious task to research the corrosion resistance of these magnetic nanostructures in simulated body fluid. © 2020 by the authors. Licensee MDPI, Basel, Switzerland.Government Council on Grants, Russian FederationBelarusian Republican Foundation for Fundamental Research, BRFFR: Ф18Д-00720163522Funding: The work was performed with support of State Scientific and Technical Program “Nanotech” (ГБЦ No 20163522), Belarusian Republican Foundation for Fundamental Research (Grant No. Ф18Д-007), Act 211 of Government of Russian Federation (contract No. 02.A03.21.0011). Additionally, the work was partially supported by the Grant of World Federation of Scientists (Geneva, Switzerland)