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

Studying the Thermodynamic Properties of Composite Magnetic Material Based on Anodic Alumina

Magnetic nanoparticles based on Fe3O4 and their modifications of surface with therapeutic substances are of great interest, especially drug delivery for cancer therapy includes boron-neutron capture therapy. In this paper we study the thermodynamic, morphological, structural, and chemical properties of a composite material consisting of nickel nanowires (NWs) electrochemically deposited in the pores of the membrane of porous anodic aluminum oxide (PAA) by methods of differential thermal analysis (DTA), scanning electron microscopy (SEM), X-ray diffraction analysis (XRD), and dispersive X-ray spectroscopy (EDX)

Методы электрохимического формирования однослойных и двухслойных мембранных структур на основе наноструктурированного анодного оксида алюминия

Technological methods for the formation of 30-70 mm thick free porous one­layer Al2O3 membranes with open­ended modificated pores from 50 to 90 nm in diameters by a two­stage one­sided anodization in oxalic acid electrolyte and combined method for the barrier layer removal were developed. Technological features for the fabrication of 73-216 μm thick porous two­layer Al2O3 membranes with 55 nm pores diameters by a two­sided through anodization and subsequent bipolar anodization for local internal Al inclusions removal were studied.Разработаны технологические способы формирования свободных пористых однослойных Al2O3-мембран толщиной 30-70 мкм со сквозными каналами модифицированных пор диаметром 50-90 нм с использованием двухстадийного одностороннего анодирования в электролите щавелевой кислоты и комбинированной методики удаления барьерного слоя. Изучены технологические особенности создания двухслойных Al2O3-мембран толщиной 73-216 мкм с диаметром пор 55 нм с применением двухстороннего сквозного анодирования и последующего биполярного анодирования для исключения локальных внутренних Al-включений

Magnetic Properties of the Densely Packed Ultra-Long Ni Nanowires Encapsulated in Alumina Membrane

High-quality and compact arrays of Ni nanowires with a high ratio (up to 700) were obtained by DC electrochemical deposition into porous anodic alumina membranes with a distance between pores equal to 105 nm. The nanowire arrays were examined using scanning electron microscopy, X-ray diffraction analysis and vibration magnetometry at 300 K and 4.2 K. Microscopic and X-ray diffraction results showed that Ni nanowires are homogeneous, with smooth walls and mostly single-crystalline materials with a 220-oriented growth direction. The magnetic properties of the samples (coercivity and squareness) depend more on the length of the nanowires and the packing factor (the volume fraction of the nanowires in the membrane). It is shown that the dipolar interaction changes the demagnetizing field during a reversal magnetization of the Ni nanowires, and the general effective field of magnetostatic uniaxial shape anisotropy. The effect of magnetostatic interaction between ultra-long nanowires (with an aspect ratio of >500) in samples with a packing factor of ≥37% leads to a reversal magnetization state, in which a “curling”-type model of nanowire behavior is realized. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.Funding: An.T. (Andrei Turutin) acknowledges the financial support of the Russian Science Foundation (Grant No. 19-79-30062) in part of the experimental work. A.K. (Alexander Kislyuk) and I.K. (Ilya Kubasov) acknowledge the financial support of the Ministry of Science and Higher Education of the Russian Federation as a part of the State Assignment (basic research, Project No. 0718-2020-0031 “New magnetoelectric composite materials based on oxide ferroelectrics having an ordered domain structure: production and properties”) in part of the XRD study

Formation and corrosion properties of Ni-based composite material in the anodic alumina porous matrix

Ni nanopillars (Ni NPs) composite material formation technology embedded in porous anodic alumina by electrochemical deposition is presented in this paper. The morphological and structural properties of the composite material were investigated using scanning electron microscopy, atomic force microscopy, X-ray diffraction. The corrosion resistance of the nanocomposite materials has been studied by potentiodynamic polarization curves analysis and polarization resistance method. The composite represents the array of vertically ordered Ni NPs with the identical size in alumina matrix. XRD investigation indicates that Ni NPs are polynanocrystalline material with 18 nm crystallite size. It has been shown that Ni NPs and the composite material have sufficient corrosion resistance in a 0.9% aqueous NaCl solution. Porous alumina is the neutral and protective component of the composite. These nanocomposite materials can be excellent candidates for practical use in electronics, sensorics, biomedicine

Жизненный и творческий путь академика М. М. Павлюченко

The article is devoted to the 110 anniversary of the birth of the Belarusian scientist, the founder of the section of chemical science – Chemistry of solids, the organizer and the first director of Institute of the General and Inorganic Chemistry of the National Academy of Sciences of Belarus, academician of the Academy of Sciences of Belarus – Mikhail Mikhaylovich Pavlyuchenko. In the article, the career devoted to search of the implication and chemical mechanism of the processes proceeding with participation of solids is described. Identification of the defining stages (limiting stages) and regularities of thermal dissociation reactions and synthesis of different classes and various structure of substances, as well as the definition of ways to operate these processes are described in this paper. His pedagogical and practical activities were purposeful, he looked for and found the young people interested in scientific research, excited them with his ideas, prepared 40 candidates and 3 Doctors of Chemistry. Together with the academician N. F. Ermolenko and the engineering structure of the institute, he prepared, proved the ways and possibilities of use and enrichment of sylvinites of the Starobinsky field, and repeatedly reported for the government and wide audience on importance of chemical industry development in Belarus. His course of life is a service to science and the Homeland.Статья посвящена 110-летию со дня рождения белорусского ученого, основателя раздела химической науки – химия твердого тела, организатора и первого директора Института общей и неорганической химии НАН Беларуси, академика Академии наук БССР Михаила Михайловича Павлюченко. Приводится описание его жизненного и творческого пути, показан поиск глубинного смысла химического механизма процессов, протекающих с участием твердых тел, выявлены определяющие этапы (лимитирующие стадии) и закономерности реакций термической диссоциации и синтеза разных классов и различной структуры веществ, а также определены пути и способы управления этими процессами. Его педагогическая и практическая деятельность были целенаправленными, он искал и находил заинтересованных в научных исследованиях молодых людей, увлекал их своими идеями и вел за собой. Им подготовлено 40 кандидатов и 3 доктора химических наук. Совместно с академиком Н. Ф. Ермоленко, инженерным составом Института подготовил, обосновал пути и возможности использования и обогащения сильвинитов Старобинского месторождения. Неоднократно докладывал перед правительством и широкой аудиторией о важности развития химической промышленности в Беларуси. Его жизненный путь – это служение науке и Родине

Magnetic Properties of the Densely Packed Ultra-Long Ni Nanowires Encapsulated in Alumina Membrane

High-quality and compact arrays of Ni nanowires with a high ratio (up to 700) were obtained by DC electrochemical deposition into porous anodic alumina membranes with a distance between pores equal to 105 nm. The nanowire arrays were examined using scanning electron microscopy, X-ray diffraction analysis and vibration magnetometry at 300 K and 4.2 K. Microscopic and X-ray diffraction results showed that Ni nanowires are homogeneous, with smooth walls and mostly single-crystalline materials with a 220-oriented growth direction. The magnetic properties of the samples (coercivity and squareness) depend more on the length of the nanowires and the packing factor (the volume fraction of the nanowires in the membrane). It is shown that the dipolar interaction changes the demagnetizing field during a reversal magnetization of the Ni nanowires, and the general effective field of magnetostatic uniaxial shape anisotropy. The effect of magnetostatic interaction between ultra-long nanowires (with an aspect ratio of >500) in samples with a packing factor of ≥37% leads to a reversal magnetization state, in which a “curling”-type model of nanowire behavior is realized. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.Funding: An.T. (Andrei Turutin) acknowledges the financial support of the Russian Science Foundation (Grant No. 19-79-30062) in part of the experimental work. A.K. (Alexander Kislyuk) and I.K. (Ilya Kubasov) acknowledge the financial support of the Ministry of Science and Higher Education of the Russian Federation as a part of the State Assignment (basic research, Project No. 0718-2020-0031 “New magnetoelectric composite materials based on oxide ferroelectrics having an ordered domain structure: production and properties”) in part of the XRD study

Magnetic Properties of the Densely Packed Ultra-Long Ni Nanowires Encapsulated in Alumina Membrane

High-quality and compact arrays of Ni nanowires with a high ratio (up to 700) were obtained by DC electrochemical deposition into porous anodic alumina membranes with a distance between pores equal to 105 nm. The nanowire arrays were examined using scanning electron microscopy, X-ray diffraction analysis and vibration magnetometry at 300 K and 4.2 K. Microscopic and X-ray diffraction results showed that Ni nanowires are homogeneous, with smooth walls and mostly single-crystalline materials with a 220-oriented growth direction. The magnetic properties of the samples (coercivity and squareness) depend more on the length of the nanowires and the packing factor (the volume fraction of the nanowires in the membrane). It is shown that the dipolar interaction changes the demagnetizing field during a reversal magnetization of the Ni nanowires, and the general effective field of magnetostatic uniaxial shape anisotropy. The effect of magnetostatic interaction between ultra-long nanowires (with an aspect ratio of >500) in samples with a packing factor of ≥37% leads to a reversal magnetization state, in which a “curling”-type model of nanowire behavior is realized