Total number
Full text
Total number
Full text
Number of local repositories
Full text
0223U003701,
0123U101228
,
Composite systems based on synthetic and natural dispersed and porous materials functionalized with organic and inorganic compounds
Hunko Volodymyr M., д.х.н.
15-06-2023
Chuiko Institute of Surface Chemistry of NAS of Ukraine
Synthesized, a series of new Co4xFexOy/pyrogenic oxide nanocomposites was synthesized by thermal oxidation of metal salts adsorbed on individual and complex pyrogenic nanooxides. The influence of the carrier structure was analyzed with regard to the formation of deposited phases. The phase composition and average crystallite sizes determined by X-ray diffraction data show that the Co3O4 phase in the Co4xFexOy/pyrogenic oxide nanocomposites contains crystallites with a diameter of 25-37 nm, while iron oxide reflections are virtually unidentifiable. According to the CEM/EDX data, the formation of the deposited Co4xFexOy phase mainly occurs on the surface of the nanocarrier, which corresponds to the Al2O3 structural regions or the solid solution structures with Al-O-Ti, Al-O-Si, and Si-O-Ti bridges. When the Co4xFexOy phase is applied to the carrier, the specific surface area of the composites slightly decreases. Incremental pore size distribution functions mainly show the mesoporosity of nanocomposites, the volume of mesopores increases significantly compared to the original pyrogenic oxides. According to LCS data, small aggregates with several nanoparticles of 100 nm in size, large aggregates up to ~1 μm, and agglomerates up to 5.5 μm are observed for aqueous dispersions of synthesized nanocomposites. There is a general tendency to increase the size of aggregates due to the modification of nanocarriers with deposited Co4xFexOy. The magnetic properties of Co4xFexOy/pyrogenic oxide nanocomposites according to the magnetization curves are characterized by a hysteresis loop with superparamagnetic behavior for Co4xFexOy/SA96 and Co4xFexOy/A2O3 (Hc = 43.05 Oe and 56.5 Oe, respectively) and a mixture of superparamagnetic and ferromagnetic for Co4xFexOy/SiO2 nanocomposites and Co4xFexOy/AST1 (Hc = 386.5 Oe and 117.8 Oe, respectively).
Andryiko Lyudmyla S.
Golovkova Luydmila P.
Guzenko Nataliya V.
Kazakova Olga O.
Matkovsky Oleksandr K.
Nychyporuk Yuriy M.
Nosach Liudmyla Viktorivna
Paentko Victoriya V.
Pachlov Evgen M.
2023-06-15
Updated: 2025-12-13
Saving a scientific data set occurs in two stages:
1.) Creating a data set
Enter the name of the set, a brief description of the set (annotation), and click the “Create set” button. After that, a draft data set will be automatically created, which you can save for further work with the set. The system will redirect you to the “Data set information” page.
2.) Filling in the data
On the “Data set information” page, you need to fill in all the fields related to the data set and upload the files.
Please note! Each file is uploaded separately. This is done to ensure the stable operation of the system.
Once you have filled in the information about the scientific data set and added the necessary files, you can save the draft or send the data to the system.
Please note! Once the data has been sent, you cannot change it.
Drafts are necessary for storing the data set and editing it before sending.
All accounts on the NRA website go through a standard registration procedure and are verified. However, in order to obtain additional features, such as publishing open reviews of academic texts, verification by affiliation is required.
To obtain the status “verified”, you must change your primary email address to a corporate one, which is tied to a scientific or educational institution.
For example: user@ukrintei.ua, user@nas.gov.ua
After confirming your corporate email address, your account will be automatically verified by affiliation.
If your email address is corporate, but your account does not have a verification mark, you need to write to us at the email address NRAT@ukrintei.ua. After verification, we will add your address to the database, and your account will be verified.
After completing the verification procedure for affiliation, you can change the primary email address to a convenient one for you, without losing your status during the current verification.
You only need to verify for affiliation once.
* We use corporate addresses from the Unified State Database on Education and the State Register of Scientific Institutions Supported by the State
To search for news published on the official website of NRАT in the “News” section, you need to enter one word, several words, or an exact phrase in the search field. Different terms are separated by spaces.
The search is performed everywhere – in the title and the news text.
For a more comprehensive result, it is recommended to use word stems (parts of words without endings).
When using multiple words for the search, they are combined using one of the logical methods described below.
By default, the logical connector “and” is used. In this case, search results will include all news releases that contain the specified words, even if they are located separately from each other and are in different parts of the text.
Example: Search phrase: OECD report. Search result: all news containing the words “report” and “OECD” in the text and in the title, both together and separately.
If a phrase or phrase is enclosed in quotation marks (“), the results will include all publications where this exact phrase or phrase is found.
Example: Search phrase: “OECD report.” Search result: all news containing the exact phrase “OECD report.”
If you know the publication date of the news or are interested in a specific time frame in which they were published on the website, you can select such a date or date range in the additional field that looks like a calendar. The date is entered in the format year-month-day and confirmed by clicking on the corresponding date in the calendar dropdown. You can enter a date or choose one by browsing through the calendar by months and years. By default, the interval starts from the oldest date (2018-01-23) and ends with the current date.
You can also use one or more hashtags, which are located under the search field on the right side of the “News” page.
Please note: The search for academic texts is carried out in a separate search window at the following link https://nrat.ukrintei.ua/searchdb.
