Temat: nanostructures - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: A Study On The Metal Carbide Composite Diffusion Bonding For Mechanical Seal
Badanie łączenia dyfuzyjnego kompozytu metal węglik na mechaniczne uszczelnienie
Autorzy:: Kim, D.-K.
Shon, I.-J.
Song, J.
Ryu, W.-J.
Shin, H.-Ch.
Kwon, E.-Y.
Shin, H.
Kang, S.-J.
Powiązania:: https://bibliotekanauki.pl/articles/356399.pdf
Data publikacji:: 2015
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: diffusion bonding
nanostructures
mechanical seal
hard metal
mechanical properties
łączenie
nanostruktura
uszczelnienie mechaniczne
twardy metal
właściwości mechaniczne
Opis:: Mechanical Seal use highly efficient alternative water having a great quantity of an aqueous solution and has an advantage no corrosion brine. Metal Carbide composites have been investigated as potential materials for high temperature structural applications and for application in the processing industry. The existing Mechanical seal material is a highly expensive carbide alloy, and it is difficult to take a price advantage. Therefore the study of replacing body area with inexpensive steel material excluding O-ring and contact area which demands high characteristics is needed. The development of WC-Ni base carbide alloy optimal bonding composition technique was accomplished in this study. To check out the influence of bonding temperature and time, bonding characteristics of sintering temperature was experimented. The bonding statuses of this test specimen were excellent. The hardness of specimen and bonding rate were measured using ultrasound equipment. In this work, Powder of WC (involved VC, Cr), Co and Mo₂C mixed by attrition milling for 24hours. Nanostructured WC-27.6wt.%Ni-1.5wt.%Si-0.11wt.%VC-1.1wt.%B₄C composite were fabricated at 1190°C by high temperature vacuum furnace. To check out the influence of bonding temperature and time, bonding characteristics of sintering temperature was experimented. Its relative density was about 99.7%. The mechanical properties (hardness and fracture toughness) were 87.2 HRA and 4.2 M·Pam^1/2, respectively. The bonding status of this test specimen was excellent and the thickness of bonding layer was 20 ~30§ at 1050 and 1060°C bonding temperature.
Źródło:: Archives of Metallurgy and Materials; 2015, 60, 2B; 1479-1483
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Analiza termodynamiczna procesu spalania mieszanin perchlorowanych węglowodorów z azydkiem sodu
Thermodynamic analysis of combustion in perchlorated hydrocarbons/sodium azide systems
Autorzy:: Szala, M.
Powiązania:: https://bibliotekanauki.pl/articles/210333.pdf
Data publikacji:: 2008
Wydawca:: Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:: synteza spaleniowa
analiza termodynamiczna
nanostruktury
combustion synthesis
thermodynamic analysis
nanostructures
Opis:: W pracy przedstawiono wyniki badań teoretycznych i eksperymentalnych dotyczących mechanizmu reakcji oraz składu skondensowanych produktów powstających podczas mieszanin perchlorowanych węglowodorów z azydkiem sodu. Analiza teoretyczna obejmowała obliczenia zmian parametrów termodynamicznych, takich jak entropia, entalpia i entalpia swobodna reakcji oraz wyznaczenie na podstawie przyjętych równań reakcji wydajności stałych produktów. Wykazano, że stałymi produktami spalania binarnych mieszanin tetrachlorometanu, heksachloroetanu, heksachlorobutadiemu i heksachlorocyklopentadienu z azydkiem sodu są cyjanek sodu, węgiel oraz chlorek sodu. Stwierdzono występowanie w produktach spalania enkapsulatów zawierajacych w swym wnętrzu krystality chlorku sodu.
Combustion reactions of perchlorated hydrocarbons with sodium azide mixtures were theoretically and experimentally investigated. Standard thermodynamic parameters like enthalpy, entropy and free enthalpy of assumed reactions were calculated. Reactions between these substrates are fast and exothermic enough to proceed at a high temperature and self-sustaining regime. Heat effects accompanying the reaction were measured and the presence of sodium cyjanide, sodium chloride and carbon in solid state reaction products were experimentally confirmed.
Źródło:: Biuletyn Wojskowej Akademii Technicznej; 2008, 57, 1; 203-213
1234-5865
Pojawia się w:: Biuletyn Wojskowej Akademii Technicznej
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Application of scanning shear-force microscope for fabrication of nanostructures
Autorzy:: Sikora, A.
Gotszalk, T.
Sankowska, A.
Rangelow, I. W.
Powiązania:: https://bibliotekanauki.pl/articles/308832.pdf
Data publikacji:: 2005
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: AFM
nanostructures fabrication
shear force microscopy
Opis:: In view of the rapid growth of interest in AFM technique in surface property investigation and local surface modification we describe here an AFM microscope with optical tip oscillation detection. The modular shear-force/tunneling microscope for surface topography measurement and nanoanodisation is described. The measurement instrument presented here is based on the fiber Fabry-Perot interferometer for the measurement of the conductive microtip oscillation that is used as nano e-beam for local surface anodisation. An advantage of this system is that quantitative measurements of tip vibration amplitude are easily performed.
Źródło:: Journal of Telecommunications and Information Technology; 2005, 1; 81-84
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Budowa, właściwości i zastosowania elektrod nano- i mikrostrukturalnych
Structure, properties and applications of nano- and microstructure electrodes
Autorzy:: Krzyczmonik, P.
Socha, E.
Powiązania:: https://bibliotekanauki.pl/articles/142116.pdf
Data publikacji:: 2015
Wydawca:: Stowarzyszenie Inżynierów i Techników Przemysłu Chemicznego. Zakład Wydawniczy CHEMPRESS-SITPChem
Tematy:: elektrody mikrostrukturalne
nanostruktury
elektrody modyfikowane
microstructure electrodes
nanostructures
modified electrodes
Opis:: Artykuł stanowi przegląd zagadnień dotyczących elektrod nano- i mikrostrukturalnych. Przedstawiono problem definiowania nano–i mikroelektrod. Opisano związek rozmiaru elektrody z rodzajem dyfuzji stosowanym do opisu prądu procesu elektrodowego. Omówiono wybrane grupy materiałów wykorzystywane do tworzenia mikroelektrod, oraz przedstawiono wybrane techniki, w których są one stosowane. Omawiano także główne zastosowania nano- i mikroelektrod.
This paper is a review of issues on nano- and microstructure electrodes. The problem of defining micro- and nanoelectrodes has been presented. Moreover, the connection between the size of electrode and the diffusion type used to describe the electrode processes has also been demonstrated. The selected group of materials used to construct microelectrodes has been described and selected techniques in which they are applied have been presented. This paper also discusses the main applications of micro- and nanoelectrodes.
Źródło:: Chemik; 2015, 69, 1; 11-18
0009-2886
Pojawia się w:: Chemik
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Carbon nanostructure growth: new application of magnetron discharge
Autorzy:: Breus, A.
Abashin, S.
Serdiuk, O.
Powiązania:: https://bibliotekanauki.pl/articles/2055755.pdf
Data publikacji:: 2021
Wydawca:: Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:: nanotechnology
plasma synthesis
carbon nanostructures
magnetron discharge
arc spots
nanotechnologia
synteza plazmowa
nanostruktury węglowe
rozpylanie magnetronowe
wyładowania
Opis:: Purpose: The application of a common magnetron discharge to the growth of carbon nanostructures is studied. The simplicity of the proposed technique can be beneficial for the development of new plasma reactors for large-scale production of carbon nanostructures. Design/methodology/approach: Graphite cathode was treated by carbon-containing powder accelerated by use of nozzle, and then aged in hydrogen. Superposition of glow and arc discharges was obtained, when putting the cathode under the negative biasing with respect to the walls of a vacuum chamber. The pulsed discharge was preserved through the whole time of treatment. This process was explained in terms of interaction of glow discharge plasma with a surface of the cathode made of non-melting material. Findings: The plasma treatment resulted in generation of the diverse nanostructures confirmed by SEM and TEM images. Spruce-like nanostructures and nanofibers are observed near the cathode edge where the plasma was less dense; a grass-like structure was grown in the area of “race-track”; net-like nanostructures are found among the nanofibers. These findings allow concluding about the possible implementation of the proposed method in industry. Research limitations/implications: The main limitation is conditioned by an explosive nature of nanostructure generation in arcs; thus, more elaborate design of the setup should be developed in order to collect the nanospecies in the following study. Practical implications: High-productivity plasma process of nanosynthesis was confirmed in this research. It can be used for possible manufacturing of field emitters, gas sensors, and supercapacitors. Originality/value: Synthesis of carbon nanostructures is conducted by use of a simple and well-known technique of magnetron sputtering deposition where a preliminary surface treatment is added to expand the production yield and diversity of the obtained nanostructures.
Źródło:: Journal of Achievements in Materials and Manufacturing Engineering; 2021, 109, 1; 17--25
1734-8412
Pojawia się w:: Journal of Achievements in Materials and Manufacturing Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Chemical evaluation of the quality of nanostructures synthesized on the surface of indium phosphide
Autorzy:: Kovachov, S.S.
Bogdanov, I.T.
Pimenov, D.O.
Bondarenko, V.V.
Konovalenko, A.A.
Skurska, M.M.
Konovalenko, I.S.
Suchikova, Y.O.
Powiązania:: https://bibliotekanauki.pl/articles/2175768.pdf
Data publikacji:: 2021
Wydawca:: Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:: semiconductors
nanostructures
chemical criterion
indium phosphide
quality indicators
półprzewodniki
nanostruktury
kryterium chemiczne
fosforek indu
wskaźniki jakości
Opis:: Purpose: The article proposes a methodology for determining the chemical quality criterion of porous layers synthesized on the surface of semiconductors, based on taking into account the chemical parameters of the surface that can affect the properties of nanostructures. Design/methodology/approach: The chemical quality criterion was evaluated in terms of stoichiometry, stability of structures over time, uniformity of distribution over the surface, and the presence of an oxide phase. As an example, a calculation is demonstrated for the por-InP/InP structure synthesized on a mono-InP surface. The results of calculating the chemical quality criterion were evaluated using the Harrington scale to rank samples by quality level. Findings: A chemical criterion for the quality of porous layers synthesized on the surface of semiconductors has been developed. This criterion contains a set of indicators sufficient for a comprehensive assessment of the surface condition and is universal in nature. The studies carried out make it possible to reasonably approach the determination of the modes of electrochemical processing of semiconductors and open up new perspectives in the construction of a model of self-organization of a porous structure. Research limitations/implications: The chemical quality criterion does not allow evaluating the obtained nanostructures in terms of geometric parameters. Therefore, in the future, there is a need to develop a morphological quality criterion and determine a methodology for assessing a generalized quality criterion for nanostructures synthesized on the surface of semiconductors, which may include economic, environmental, technological indicators, and the like. Practical implications: Study results are expedient from a practical point of view, since they make it possible to reasonably approach the determination of the modes of electrochemical processing of semiconductors, synthesize nanostructures with predetermined properties, and create standard samples of nanomaterial composition. Originality/value: Methodology for assessing the quality of porous semiconductors by a chemical criterion has been applied for the first time in engineering science. The article will be useful to engineers, who are engaged in the synthesis of nanostructures, researchers and scientists, as well as specialists in nanometrology.
Źródło:: Archives of Materials Science and Engineering; 2021, 110, 1; 18--26
1897-2764
Pojawia się w:: Archives of Materials Science and Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Cold plasma in the nanotechnology of catalysts
Autorzy:: Tyczkowski, J.
Kapica, R.
Powiązania:: https://bibliotekanauki.pl/articles/778491.pdf
Data publikacji:: 2007
Wydawca:: Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:: kataliza
nanostruktura
plazma zimna
CVD
tlenek kobaltu
cienka warstwa
catalysis
nanostructures
cold plasma
metal-organic chemical vapor deposition
cobalt oxides
thin films
Opis:: In the paper the preparation of catalysts with the use of cold plasmas is discussed. A special attention is focused on nanocatalysts. In general, there are three main trends in this field: (1) plasma enhanced preparation of ..classical" catalysts, (2) plasma sputtering of catalytically active compounds, especially metal and metal oxide nanoparticles, and (3) plasma-enhanced metal-organic chemical vapor deposition (PEMOCVD) of very thin metal and metal oxide films with specific nanostructure. It is shown that the cold plasma techniques are very effective methods for designing the nanocatalysts with distinct and tunable chemical activity, specificity and selectivity. Finally, our preliminary investigations concerning CoOx catalytic films fabricated by the PEMOCVD method are presented.
Źródło:: Polish Journal of Chemical Technology; 2007, 9, 1; 36-42
1509-8117
1899-4741
Pojawia się w:: Polish Journal of Chemical Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Comparative study on mechanical and bioactive properties of different nanopatterned TiO2 substrates
Autorzy:: Bartkowiak, Amanda
Zarzycki, Arkadiusz
Kąc, Sławomir
Perzanowski, Marcin
Marszałek, Marta
Powiązania:: https://bibliotekanauki.pl/articles/1844900.pdf
Data publikacji:: 2020
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:: nanostructures
mechanical properties
bioactive properties
nanostruktury
właściwości mechaniczne
właściwości bioaktywne
Źródło:: Engineering of Biomaterials; 2020, 23, 158 spec. iss.; 63
1429-7248
Pojawia się w:: Engineering of Biomaterials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Effect of photoanode structure and sensitization conditions on the photovoltaic response of dye-sensitized solar cells
Autorzy:: Gnida, Paweł
Słodek, Aneta
Schab-Balcerzak, Ewa
Powiązania:: https://bibliotekanauki.pl/articles/2083481.pdf
Data publikacji:: 2022
Wydawca:: Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:: dye-sensitized solar cells
N719
phenothiazine derivatives
TiO2 nanostructures
co-sensitization
co-adsorbents
Opis:: This work summarises investigations focused on the photoanode impact on the photovoltaic response of dye-sensitized solar cells. This is a comparison of the results obtained by the authors’ research team with literature data. The studies concern the effect of the chemical structure of the applied dye, TiO₂ nanostructure, co-adsorbents addition, and experimental conditions of the anode preparation. The oxide substrates were examined using a scanning electron microscope to determine the thickness and structure of the material. The TiO₂ substrates with anchored dye molecules were also tested for absorption properties in the UV-Vis light range, largely translating into current density values. Photovoltaic parameters of the fabricated devices with sandwich structure were obtained from current-voltage measurements. During tests conducted with the N719 dye, it was found that devices containing an 8.4 μm thick oxide semiconductor layer had the highest efficiency (5.99%). At the same time, studies were carried out to determine the effect of the solvent and it was found that the best results were obtained using an ACN : tert-butanol mixture (5.46%). Next, phenothiazine derivatives (PTZ-1–PTZ-6) were used to prepare the devices; among the prepared solar cells, the devices containing PTZ-2 and PTZ-3 had the highest performance (6.21 and 6.22%, respectively). Two compounds designated as Th-1 and M-1 were used to prepare devices containing a dye mixture with N719.
Źródło:: Opto-Electronics Review; 2022, 30, 1; art. no. e140739
1230-3402
Pojawia się w:: Opto-Electronics Review
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Effect of Powder Grain Size and Titania Content on Mechanical and Tribological Properties of Plasma Sprayed AL2O3-TiO2 Ceramic Coatings
Autorzy:: Góral, A.
Żórawski, W.
Powiązania:: https://bibliotekanauki.pl/articles/355219.pdf
Data publikacji:: 2019
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: Al2O3-TiO2 coating
nanostructures
mechanical properties
wear resistance
Opis:: In this work, three ceramic composite coatings Al₂O₃-3TiO₂ C, Al₂O₃-13TiO₂ C, and Al₂O₃-13TiO₂ N were plasma sprayed on steel substrates. They were deposited with two conventional powders differing the volume fraction of TiO₂ and nanostructured powder. The mechanical and tribological properties of the coatings were investigated and compared. The increase in TiO₂ content from 3 wt.% to 13 wt.% in the conventional feedstock improved the mechanical properties and abrasion resistance of coatings. However, the size of the used powder grains had a much stronger influence on the properties of deposited coatings than the content of the titania phase. The Al₂O₃-13TiO₂ coating obtained from nanostructured powder revealed significantly better properties than that plasma sprayed using conventional powder, i.e. 22% higher microhardness, 19% lower friction coefficient, and over twice as good abrasive wear resistance. In turn, the Al₂O₃-13TiO₂ conventional coating showed an increase in microhardness and abrasive wear resistance, 36% and 43%, respectively, and 6% higher coefficient of friction compared to the Al₂O₃-3TiO₂ conventional coating.
Źródło:: Archives of Metallurgy and Materials; 2019, 64, 1; 45-53
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Fabrication and Optoelectronic properties of Fluoride tin oxides/porous silicon/p-Silicon heterojunction
Autorzy:: Hadi, H. A.
Powiązania:: https://bibliotekanauki.pl/articles/411926.pdf
Data publikacji:: 2014
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: porous silicon
electrochemical etching
spray pyrolysis
fluoride-doped tin oxide film
nanostructures
SEM
AFM
photodetector
Opis:: In this paper, formation of a nanostructure semi transparence fluoride tin oxides (FTO) by spray pyrolysis technique on porous silicon PS layer. Porous silicon PS layer was prepared by anodization of p-type silicon wafers to fabricate of the UV- Visible Fluoride-doped tin oxide /Porous silicon /p-Si heterojunction photodetector. Optical properties of FTO thin films were measured. The optical band gap of 3.77 eV for SnO₂ : F for film was deduced. From (I-V) and (C-V) measurements, the barrier Ø_B height for FTO/PS diode was of 0.77, and the built in voltage V_bi, which was of 0.95 V. External quantum efficiency was 55 % at 500 nm which corresponding to peak responsivity of 1.15 A/W at 1 V bias. The PS band gap in the vicinity of PS/c-Si heterojunction was 1.38 eV.
Źródło:: International Letters of Chemistry, Physics and Astronomy; 2014, 17, 2; 142-152
2299-3843
Pojawia się w:: International Letters of Chemistry, Physics and Astronomy
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Functional model for the synthesis of nanostructures of the given quality level
Autorzy:: Suchikova, Y.O.
Kovachov, S.S.
Shishkin, G.O.
Pimenov, D.O.
Lazarenko, A.S.
Bondarenko, V.V.
Bogdanov, I.T.
Powiązania:: https://bibliotekanauki.pl/articles/2175807.pdf
Data publikacji:: 2021
Wydawca:: Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:: functional model
electrochemical etching
quality level
semiconductors
nanostructures
IDEF0 methodology
model funkcjonalny
trawienie elektrochemiczne
poziom jakości
półprzewodniki
nanostruktury
metodologia IDEF0
Opis:: Purpose: The aim of this paper is to develop a functional model for the synthesis of nanostructures of the given quality level, which will allow to effectively control the process of nanopatterning on the surface of semiconductors with tunable properties. Design/methodology/approach: The paper uses the IDEF0 methodology, which focuses on the functional design of the system under study and describes all the necessary processes with an accuracy sufficient for an unambiguous modelling of the system's activity. Based on this methodology, we have developed a functional model for the synthesis of nanostructures of the given quality level and tested its effectiveness through practice. Findings: The paper introduces a functional model for the synthesis of nanostructures on the surface of the given quality level semiconductors and identifies the main factors affecting the quality of nanostructures as well as the mechanisms for controlling the formation of porous layers with tunable properties. Using the example of etching single-crystal indium phosphide electrochemically in a hydrochloric acid solution, we demonstrate that the application of the suggested model provides a means of forming nanostructures with tunable properties, assessing the quality level of the nanostructures obtained and bringing the parameters in line with the reference indicators at a qualitatively new level. Research limitations/implications: Functional modelling using the IDEF0 methodology is widely used when process control is required. In this study it has been applied to control the synthesis of nanostructures of the given quality level on the surface of semiconductors. However, these studies require continuation, namely, the establishment of correlations between the technological and resource factors of synthesis and the acquired properties of nanostructures. Practical implications: This study has a significant practical effect. Firstly, it shows that functional modelling can reduce the time required to form large batches of the given quality level nanostructures. This has made it possible to substantiate the choice of the initial semiconductor parameters and nanostructure synthesis modes in industrial production from the theoretical and empirical perspective. Secondly, the presented methodology can be applied to control the synthesis of other nanostructures with desired properties and to reduce the expenses required when resources are depleted and the cost of raw materials is high. Originality/value: This paper is the first to apply the IDEF0 methodology to control the given quality nanostructure synthesis. This paper will be of value to engineers who are engaged in the synthesis of nanostructures, to researchers and scientists as well as to students studying nanotechnology.
Źródło:: Archives of Materials Science and Engineering; 2021, 107, 2; 72--84
1897-2764
Pojawia się w:: Archives of Materials Science and Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Gas sensors based on nanostructures of semiconductors ZnO and TiO2
Autorzy:: Pustelny, T.
Procek, M.
Maciak, E.
Stolarczyk, A.
Drewniak, S.
Urbańczyk, M.
Setkiewicz, M.
Gut, K.
Opilski, Z.
Powiązania:: https://bibliotekanauki.pl/articles/201719.pdf
Data publikacji:: 2012
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: gas sensors
nanostructures
TiO2
ZnO
Opis:: The paper presents a resistance structures with sensor layers based on nanostructures elaborated on the base of TiO2 and ZnO. The structures were tested concerning their sensitivities to the effects of nitrogen dioxide in the atmosphere of synthetic air. The TiO2 and ZnO nanostructures played the role of sensor layers. Investigations have proved that the elaborated resistance structures with TiO2 and ZnO layers are sensitive to the presence of NO2 in the atmosphere of synthetic air. The resistance of the structure amounted to about 20 in the case of ZnO structures and to about 200 in the case of TiO2 structures. The investigations confirmed that resistance structures with ZnO and TiO2, exposed to the effect of nitrogen dioxide in the atmosphere of synthetic air changes their resistances relatively fast. This indicates that such structures might be practically applied in sensors of nitrogen dioxide ensuring a short time of response.
Źródło:: Bulletin of the Polish Academy of Sciences. Technical Sciences; 2012, 60, 4; 853-859
0239-7528
Pojawia się w:: Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Justification of the most rational method for the nanostructures synthesis on the semiconductors surface
Autorzy:: Suchikova, Y.
Vambol, S.
Vambol, V.
Mozaffari, N.
Powiązania:: https://bibliotekanauki.pl/articles/368501.pdf
Data publikacji:: 2019
Wydawca:: Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:: hierarchies’ analysis method
chemical etching
electrochemical etching
lithographic etching
nanostructures synthesis
metoda hierarchii analitycznej
trawienie chemiczne
wytrawianie elektrochemiczne
litografia
synteza nanostruktur
Opis:: Purpose: of this paper is to justification the most rational method for the nanostructures synthesis on the semiconductors surface, which is capable of providing high quality synthesized nanostructures at low cost and ease of the process. Design/methodology/approach: The choice of the optimal method of synthesis was carried out using the hierarchy analysis method, which is implemented by decomposing the problem into more simple parts and further processing judgments at each hierarchical level using pair comparisons. Findings: The article describes the main methods of synthesis of nanostructures, presents their advantages and disadvantages. The methods were evaluated by such criteria as: environmental friendliness, efficiency, stages number of the technological process, complexity, resources expenditure and time and effectiveness. Using the hierarchy analysis method, has been established that electrochemical etching is the most important alternative, and when choosing a nanostructures synthesis method on the semiconductors surface, this method should be preferred. Such studies are necessary for industrial serial production of nanostructures and allow reducing expenses at the realization of the problem of synthesis of qualitative samples. Research limitations/implications: In this research, the hierarchy analysis method was used only to select a rational method for synthesizing nanostructures on the semiconductors surface. However, this research needs to be developed with respect to establishing a correlation between the synthesis conditions and the nanostructures acquired properties. Practical implications: First, was been established that the optimal method for the nanostructures synthesis on the semiconductors surface is electrochemical etching, and not lithographic or chemical method. This allowed the theoretical and empirical point of view to justify the choice of the nanostructures synthesis method in the industrial production conditions. Secondly, the presented method can be applied to the synthesis method choice of other nanostructures types, which is necessary in conditions of resources exhaustion and high raw materials cost. Originality/value: In the article, for the first time, the choice of the nanostructures synthesis method on the semiconductors surface is presented using of paired comparisons of criteria and available alternatives. The article will be useful to engineers involved in the nanostructures synthesis, researchers and scientists, as well as students studying in the field of "nanotechnology".
Źródło:: Journal of Achievements in Materials and Manufacturing Engineering; 2019, 92, 1-2; 19-28
1734-8412
Pojawia się w:: Journal of Achievements in Materials and Manufacturing Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: Microbial synthesis of unique nanoscale minerals - challenges and prospects
Autorzy:: Maliszewska, Irena
Kocek, Daria
Wanarska, Ewelina
Powiązania:: https://bibliotekanauki.pl/articles/1450218.pdf
Data publikacji:: 2020
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: nanostructures
silicified frustules
coccoliths
magnetosomes
bacterial nanowires
Opis:: In this review, we highlight new insights and place the molecular mechanisms of the biogenesis of nanomaterials such as silicified frustules, coccoliths, magnetosomes and bacterial nanowires in the context of the complex biology of a microbial cell. The silicified frustules are formed by diatoms, which are a widespread group of organisms found in the oceans, fresh water, soil and wet surfaces. They are especially important in the oceans, where it is estimated that they contribute to 45% of total primary ocean production. Coccolith is a collective term that designates all of the biomineralized, calcified scales produced by extant and extinct haptophytes (single-celled algae). The orientation of magnetotactic bacteria is based on the presence of unique organelles, magnetosomes, which are intracellular, membrane-enclosed, nanometre-sized crystals of magnetic iron minerals. The discovery of bacterial conductive structures, called nanowires, has fascinated scientists for almost a decade. Nanowires enable bacteria to transfer electrons over micrometer distances to extracellular electron acceptors such as insoluble metal oxides or electrodes. The possible applications of these extremely interesting nanomaterials in different areas of life is also considered.
Źródło:: Physicochemical Problems of Mineral Processing; 2020, 56, 6; 244-256
1643-1049
2084-4735
Pojawia się w:: Physicochemical Problems of Mineral Processing
Dostawca treści:: Biblioteka Nauki

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