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Journal articles on the topic 'Dispergator'

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Author: Grafiati
Published: 30 May 2022
Last updated: 31 May 2022

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1

Koch, Ursula, and Friedrich Wolf. "Zur Stabilisierung von Farbstoffdispersionen mit Polyvinylpyrrolidon als Dispergator." Zeitschrift für Chemie 14, no. 10 (September 1, 2010): 406–7. http://dx.doi.org/10.1002/zfch.19740141007.

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2

Pushkarova, Kateryna, Maryna Sukhanevych, and Artur Martsikh. "Using of Untreated Carbon Nanotubes in Cement Compositions." Materials Science Forum 865 (August 2016): 6–11. http://dx.doi.org/10.4028/www.scientific.net/msf.865.6.

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One of the most important problem of concrete durability is increasing of waterproofing. Researches are devoted studying of cement mortars modified by carbon nanotubes, dispersed in plasticizers solutions. Were investigated physico-mechanical properties of cement paste, cement-sand mortar into which structure entered untreated carbon nanotubes (production of plant TM "Spetsmash" Kyiv, Ukraine) in various quantity. Were used as plasticizers in cement compositions additives substances of the various chemical nature – naphtaleneformaldehyde, melamineformaldehyde and polycarboxylate. Quantity of untreated nanotubes varied from 0,5%; 1,0% and to 1,5%. Concentration of additives was accepted taking into account recommendations of producers and made about 1% from the weight of cement. Were studied some technological processes of introduction untreated carbon nanotubes in cement system and is shown that the way of introduction of nanomodifiers has essential impact on strength characteristics of cementitious materials. Optimum decision introduction of untreated carbon nanotubes is using its in dispersion plasticizer of the working concentration prepared in an ultrasonic dispergator is established. Results of physico-mechanical tests of cement paste and cement-sand mortar showed positive influence at introduction of untreated carbon nanotubes as cement modifiers on strength characteristics of samples. Resalts is shown that the nanomodifier, used quantity about 1% in solution of lignosulfonate with polycarboxylate and melamineformaldehyde plasticizer has great impact on strength characteristics.
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3

Мидуков (Midukov), Николай (Nikolaj) Петрович (Petrovich), Данил (Danil) Сергеевич (Sergeevich) Ефремов (Efremov), Виктор (Viktor) Сергеевич (Sergeevich) Куров (Kurov), and Александр (Аleksandr) Семёнович (Semyonovich) Смолин (Smolin). "THE PREPARATION OF FIBERS FOR CARDBOARD PRODUCTION." chemistry of plant raw material, no. 3 (April 9, 2018): 279–86. http://dx.doi.org/10.14258/jcprm.2018033698.

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The article presents the data about the preparation of recovered paper using dry method. The objective of this method of fiber preparation is to reduce water and energy consumption as well as obtaining higher physical and mechanical characteristics of the cardboard. There is used a dispergator parts of which are constructed with 3D printer. After dry defibration, the purification is carried out. Acquired finely dispersed, refined material is used to produce the three-layer cardboard – test-liner. According to standard methodologies, there were determined such mechanical parameters of multi-layer test-liner as breaking length, bursting strength. Obtained results can be used to produce multi-layer testliner to reduce energy costs, as well as water consumption. As a result of this research, it turned out that using the method of preliminary dry dispersion of fibers, it becomes possible to reduce metal volume of the equipment as well as energy and water consumption. Previously, the mechanical grinding of recycled fibers was not carried out. Therefore the data presented in this article allow assess the cost of applying this method into the industry. The method of dry dispersion, which was carried out and studied in laboratory conditions, is not currently applied in the paper and cardboard industry of Russia, despite its advantages. In the future, it is planned to conduct repeated studies, with a view to the possible introduction of this method into the industry.
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4

Zhurinov M.Zh.,, Teltayev B.B.,, Kalybay A.A.,, Rossi C.O.,, and Amirbayev Ye.D.,. "COMPARATIVE ANALYSIS OF LOW TEMPERATURE RESISTANCE FOR NANOCARBON AND OTHER BITUMENS." NEWS of National Academy of Sciences of the Republic of Kazakhstan 5, no. 443 (October 15, 2020): 89–96. http://dx.doi.org/10.32014/2020.2518-170x.108.

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A comparative analysis of the low temperature resistance for a nanocarbon bitumen and other 30 neat and modified bitumens has been performed in the work. The stiffness at the temperatures of -24°С, -30°С and -36°С under technical system Superpave has been accepted as an indicator of low temperature resistance of the bitumens. The stiffness of the bitumens has been determined on a bending beam rheometer (standard ASTM D 6648-08). Before testing the bitumens have been subjected to the double artificial aging: short-term aging – under standard AASHTO Т 240-13 and long-term aging – under standard ASTM D 6521-08. The nanocarbon bitumen has been prepared in the laboratory of the Kazakhstan Highway Research Institute (KazdorNII) with the use of a road bitumen of the grade BND 70/100 produced by the Pavlodar petrochemical plant (PNHZ) and a nanocarbon powder (2% by weight) manufactured from a coal rock of the deposit “Saryadyr” “Corporation “ON-Olzha” LLP, Akmola region, Kazakhstan). The nanocarbon powder (150-200 nm) has been manufactured by three-stage size reduction of the coal rock: I – a mechanical dispergator (up to 2-3 mm), II – an aerodynamic mill (up to 20 mcm), III – a reactor with a rotating electromagnetic field. The neat bitumens of the grades BND 50/70, BND 70/100, BND 100/130 have been produced by the plants of Kazakhstan and Russia; they satisfy the requirements of the standard ST RK 1373-2013. The modified bitumens have been prepared in the laboratory of KazdorNII with the use of the neat bitumens, 7 types of the polymers, crumb rubber and polyphosphoric acid and they satisfy the requirements of the standard ST RK 2534-2014. It has been determined that the nanocarbon bitumen is one of the most resistant at the low temperatures: -24°С, -30°С and -36°С.
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5

Sergeyeva, Olga V. "SMALL PARTICLES WITH LARGE PERSPECTIVES: II. HOW TO OBTAIN?" GAMTAMOKSLINIS UGDYMAS / NATURAL SCIENCE EDUCATION 5, no. 1 (April 1, 2008): 51–60. http://dx.doi.org/10.48127/gu-nse/08.5.51.

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The second article of the series deals with the main trends in the development of the methods to obtain nanoparticles – so called “bottom-up” and “up-bottom”. In the first case small particles are formed as a result of combination of the smaller ones (atoms as a limit), in the second – as a result of dispergation of the bulk matter. The electronic structure and the properties of the particles therewith could be different in the dependence on the way they were obtained (by means of dispergation or the atomic aggregation). Atoms and very small clusters can be stabilized by methods of cryochemistry discussed in the article. Nanoparticles formation by means of chemical and radiochemical synthesis, synthesis in the heterophase systems, providing the effective control of particle size and shape, the ways to obtain core-shell and hollow particles are considered next as well as the principles of the mechanical and chemical (redox) dispergation of the solids, leading to the ultradispersive and nanosized particles formation. Key words: nanoparticles, formation, chemical, cryochemical and radiochemical synthesis, dispergation.
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6

Dumitrash, P. G., M. K. Bologa, T. V. Kuchuk, and T. D. Shemyakova. "Cavitation technologies for dispergation and homogenization." Surface Engineering and Applied Electrochemistry 45, no. 4 (August 2009): 342–46. http://dx.doi.org/10.3103/s1068375509040152.

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7

Kolomiets, Alexander, and Tomas Jirout. "Analysis of the Dispersion of Viscoelastic Clusters in the Industrial Rotor-Stator Equipment." Processes 9, no. 12 (December 11, 2021): 2232. http://dx.doi.org/10.3390/pr9122232.

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Materials with complex rheology and viscoelasticity may require special equipment for processing, such as for dispergation. Rheological and mechanical data of the material can help with finding the required equipment or designing equipment. For highly viscous and complex material, a rotor-stator mixer can be a good choice for dispergation. Due to the laminar or creeping mechanism of flow inside the equipment, the dispergation mechanism is assumed to be a combination of the shear stress and slicing of the material by the rotor and stator blades. For the validation of the theory, the mechanical properties of the viscose identified in a previous work were used for comparison with the data from the CFD simulation of the rotor-stator mixer. The comparison showed that the rotor-stator device can overcome the complex shear modulus and ultimate strength of the material and homogenize the solution through a combination of the shear stress and slicing. The theory was also confirmed on the process line proposed for homogenization of the specific material. The stability of viscosity during the process of homogenization was measured and used as the main parameter for quality assessment.
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8

Rusanov, A. I. "Thermodynamics of dispergation: development of Rehbinder’s ideas." Colloids and Surfaces A: Physicochemical and Engineering Aspects 160, no. 2 (December 1999): 79–87. http://dx.doi.org/10.1016/s0927-7757(99)00353-2.

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9

Tarasov, B. P., E. E. Fokina, and V. N. Fokin. "Chemical methods of dispergation of metallic phases." Russian Chemical Bulletin 60, no. 7 (July 2011): 1252–60. http://dx.doi.org/10.1007/s11172-011-0193-9.

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10

Itkulova, Sh S., and G. D. Zakumbaeva. "Olefine Production from Syngas over Bimetallic Supported." Eurasian Chemico-Technological Journal 2, no. 1 (April 15, 2016): 75. http://dx.doi.org/10.18321/ectj360.

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<p>Bimetallic cobalt-containing catalysts supported on alumina have been studied in the Fischer-Tropsch synthesis. It has been shown that a promotion of Co/Al<sub>2</sub>O<sub>3</sub> by iridium leads to dispergation of both metals. It was supposed that the metal dispergation occurred due to M-M interaction with formation of the bimetallic nano-particles of cluster type. These particles have the high catalytic activity, selectivity and stability in the Fischer-Tropsch synthesis. It was observed that by regulation of the process conditions it is possible to obtain the definite hydrocarbon fractions. Thus, the increase both CO+H<sub>2</sub> ratio and space velocity is accompanied by high olefin yield.</p>
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11

Dumitrash, P. G., and M. K. Bologa. "Dispergation and homogenization of disperse systems in an acoustic field." Surface Engineering and Applied Electrochemistry 43, no. 2 (April 2007): 136–39. http://dx.doi.org/10.3103/s1068375507020135.

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12

Nasiedkin, D. B., M. O. Nazarchuk, A. G. Grebenyuk, L. F. Sharanda, and Yu V. Plyuto. "Quantum chemical simulation of MoO3 dispergation on hydroxylated SiO2 surface." Surface 13(28) (December 30, 2021): 75–83. http://dx.doi.org/10.15407/surface.2021.13.075.

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Метою даної роботи є оцінка енергетичної сприятливості утворення різних молібдатних груп (≡Si‑O‑)2Mo(=O)2 та =Si(‑O‑)2Mo(=O)2 під час термічно ініційованого диспергування MoO3 на гідроксильованій поверхні SiO2. Для цього було здійснено квантовохімічне моделювання реакції O12Si10(OH)16 + MoO3 = O12Si10(OH)14O2MoO2 + H2O в температурному інтервалі 300–1100 K із використанням обмеженого методу Хартрі-Фока (наближення ЛКАО) з валентним базисом SBKJC (Stevens-Basch-Krauss-Jasien-Cundari). Кластер O12Si10(OH)16, який являє собою структурний фрагмент кристала β‑кристобаліту, був використаний як модель високогідроксильованої поверхні кремнезему. Ми розглянули дві структури молібдатних груп (≡Si‑O‑)2Mo(=O)2, прикріплених до кремнеземного кластера O12Si10(OH)16 через силанольні групи. Молібдатні групи (Etot ‑584.60147 Hartree), прикріплені до кремнеземного кластера через віддалені силанольні групи, виявляються більш енергетично вигідними, ніж молібдатні групи (Etot ‑584.56565 Hartree), прикріплені до кремнеземного кластера через сусідні силанольні групи. Енергія молібдатних груп =Si(‑O‑)2Mo(=O)2 (Etot ‑584.48399 Hartree), прикріплених до кремнеземного кластера O12Si10(OH)16 через силандіольні групи, менш енергетично вигідні в порівнянні з подібними групами, прикріпленими через силанольні групи, через більше напруження кута між зв’язками. Знайдено, що реакція O12Si10(OH)16 + MoO3 = O12Si10(OH)14O2MoO2 + H2O в температурному інтервалі 300–1100 K, змодельована шляхом квантовохімічних розрахунків, свідчить, що процес диспергування MoO3 на гідроксильованій поверхні SiO2 є енергетично вигідним. Експ The aim of the present work is to evaluate the energetic favourability of the formation of different molybdate species (≡Si‑O‑)2Mo(=O)2 and =Si(‑O‑)2Mo(=O)2 during the thermally induced MoO3 dispergation on hydroxylated SiO2 surface. In order to do this a quantum chemical modelling of the reaction O12Si10(OH)16 + MoO3 = O12Si10(OH)14O2MoO2 + H2O within the temperature interval of 300–1100 K was undertaken using the Restricted Hartree-Fock method (the LCAO approximation) with the SBKJC (Stevens-Basch-Krauss-Jasien-Cundari) valence basis set. The cluster O12Si10(OH)16 which represents a structural fragment of a β‑cristobalite crystal was used in this work as a model of highly hydroxylated silica surface. We considered two structures of molybdate (≡Si‑O‑)2Mo(=O)2 species attached to O12Si10(OH)16 silica cluster via silanol groups. Molybdate species (Etot ‑584.60147 Hartree) attached to silica cluster via distant silanols appeared more energetically favourable than molybdate species (Etot ‑584.56565 Hartree) attached to silica cluster via nearby silanols. The energy of molybdate =Si(‑O‑)2Mo(=O)2 species (Etot ‑584.48399 Hartree) attached to O12Si10(OH)16 silica cluster via silanediol group is less favourable energetically in comparison with those attached via silanol groups because of higher bond angle straining. The reaction O12Si10(OH)16 + MoO3 = O12Si10(OH)14O2MoO2 + H2O in the temperature interval of 300–1100 K which simulates by quantum chemical calculations the dispergation of MoO3 on hydroxylated SiO2 surface was found to be energetically favourable. The experimentally optimised temperature of ca. 800 K required for dispergation of MoO3 on hydroxylated SiO2 surface is determined by MoO3 evaporation and transportation via the gas phase. ериментальна оптимальна температура (близько 800 K), потрібна для диспергування MoO3 на гідроксильованій поверхні SiO2, визначається випаровуванням та перенесенням MoO3 в газовій фазі.
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13

Sergeev, S. V., A. A. D'yakonov, Yu S. Sergeev, and A. V. Kononistov. "Expansion of technological capabilities of vibration dispergators by equipment by their resonant vibrodrives." Bulletin of the South Ural State University series "Mechanical Engineering Industry" 17, no. 03 (2017): 16–25. http://dx.doi.org/10.14529/engin170302.

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14

Qu, Chunlai, Fang Cheng, Hui Su, and Yang Zhao. "Dispergation and modification of multi-walled carbon nanotubes in aqueous solution." Russian Journal of Physical Chemistry A 90, no. 11 (October 19, 2016): 2230–36. http://dx.doi.org/10.1134/s0036024416110066.

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15

Lützen, Hendrik, Martin Wirts-Rütters, and Andreas Hartwig. "Structural Studies of Aromatic Surfactants for Dispergation of Multiwall Carbon Nanotubes." Soft Materials 10, no. 4 (October 2012): 462–71. http://dx.doi.org/10.1080/1539445x.2010.533225.

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16

Czaniková, Klaudia, Zdenko Špitalský, Igor Krupa, and Mária Omastová. "Electrical and Mechanical Properties of Ethylene Vinyl Acetate Based Composites." Materials Science Forum 714 (March 2012): 193–99. http://dx.doi.org/10.4028/www.scientific.net/msf.714.193.

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In this study various composites based on the commercial ethylene vinyl acetate polymer matrix and multiwalled carbon nanotubes were prepared by casting from solution in the form of thick films. The degree of dispergation of carbon nanotubes in the polymer matrix was examined by scanning electron microscopy. Electrical conductivity and mechanical properties of those composites were investigated. It was observed that the electrical conductivity of composites increases with an increase of multiwalled carbon nanotubes content. The mechanical properties of composites were only slightly changed when compared with properties of neat ethylene vinyl acetate matrix.
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17

BIELINSKI, DARIUSZ M., OTMAR DOBROWOLSKI, and LUDOMIR SLUSARSKI. "Dispersion of a filler in the rubber blend. Part I. Dispergation process description." Polimery 52, no. 07/08 (July 2007): 546–55. http://dx.doi.org/10.14314/polimery.2007.546.

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18

Derevianko, Victor, Natalia Kondratieva, and Hanna Hryshko. "Study of impact factors and the mechanism of gypsum binder hydration process in the presence of nanomodifiers." French-Ukrainian Journal of Chemistry 6, no. 1 (2018): 92–100. http://dx.doi.org/10.17721/fujcv6i1p92-100.

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This article represents the results of the research of nanomodification of mineral binders involving structure formation mechanisms and gypsum binder hydration process, and thus, affecting various properties. Experiments proved that during growth, crystals partly penetrate into each other and form a three-dimensional network permeating and incorporating the entire gypsum stone into a whole body, which promotes structuring of calcium sulfate matrix and improvement in gypsum compressive strength up to 30%. Chemical functionalization of the surface of carbon nanotubes promotes a reduced sedimentation effect, allows for a more uniform nanostructure dispergation throughout the modified material volume and provides chemical interaction between the substance matrix and nanotubes.
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19

Černoch, Michal, Martin Hájek, and František Skopal. "Study of effects of some reaction conditions on ethanolysis of rapeseed oil with dispergation." Bioresource Technology 101, no. 4 (February 2010): 1213–19. http://dx.doi.org/10.1016/j.biortech.2009.09.033.

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20

Skripkiūnas, Gintautas, Ekaterina Karpova, Rostislav Drochytka, and Jakub Hodul. "Hydration and Microstructure of Nano Modified Cement Paste." Solid State Phenomena 321 (July 26, 2021): 9–14. http://dx.doi.org/10.4028/www.scientific.net/ssp.321.9.

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Hydration of cement systems modified by nano additives requires the understanding of its mechanisms. The present research is focused on the investigation of hydration processes in cement pastes modified by multi-walled carbon nanotubes (MWCNTs) suspension. The ultrasonication method was used for homogenization of MWCNTs in the volume of an aqueous suspension. The hydration of cement pastes was assessed by the calorimetry test. The prolongation of cement hydration in case of modification by MWCNT suspension was observed. The microstructure observation by scanning electron microscopy (SEM) was performed for identification of MWCNT's dispergation in hardened cement pastes and for the observation of cement hydration products. The compressive and flexural strength were tested to evaluate the effect of MWCNT on mechanical properties of hardened cement paste.
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21

Boruk, S. D., K. S. Dremlyuzhenko, V. Z. Tsalyi, І. М. Yuriychuk, V. P. Kladko, A. Y. Gudimenko, O. A. Kapush, S. G. Dremlyuzhenko, and S. I. Budzulyak. "Properties of Highly Dispersed Systems on The Base of Cadmium Telluride Obtained by Electrochemical Dispergation." Фізика і хімія твердого тіла 18, no. 3 (September 15, 2017): 338–41. http://dx.doi.org/10.15330/pcss.18.3.338-341.

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Physical and chemical properties of highly dispersed systems on the base of metallic (cadmium, tellurium) and semiconductor materials (cadmium telluride) obtained by the plasma-electrochemical method are studied. It is shown that obtained systems consist of particles of different sizes, and in some cases there are two polymorphic modifications of the systems.
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22

Makhno, S. M. "Influence of noncontact dispergation of carbon nanotubes on the electrophysical properties of composites containing polychlorotrifluoroethylene." Himia, Fizika ta Tehnologia Poverhni 6, no. 3 (September 30, 2015): 372–79. http://dx.doi.org/10.15407/hftp06.03.372.

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23

Dukarov, S. V., S. I. Petrushenko, and V. N. Sukhov. "Supercooling during crystallisation and thermal dispergation of thin In-Pb films located between molybdenum layers." Thin Solid Films 734 (September 2021): 138867. http://dx.doi.org/10.1016/j.tsf.2021.138867.

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24

Slepička, Petr, Nikola Slepičková Kasálková, Jakub Siegel, Zdeňka Kolská, and Václav Švorčík. "Methods of Gold and Silver Nanoparticles Preparation." Materials 13, no. 1 (December 18, 2019): 1. http://dx.doi.org/10.3390/ma13010001.

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The versatile family of nanoparticles is considered to have a huge impact on the different fields of materials research, mostly nanoelectronics, catalytic chemistry and in study of cytocompatibility, targeted drug delivery and tissue engineering. Different approaches for nanoparticle preparation have been developed, not only based on “bottom up” and “top down” techniques, but also several procedures of effective nanoparticle modifications have been successfully used. This paper is focused on different techniques of nanoparticles’ preparation, with primary focus on metal nanoparticles. Dispergation methods such as laser ablation and vacuum sputtering are introduced. Condensation methods such as reduction with sodium citrate, the Brust–Schiffrin method and approaches based on ultraviolet light or biosynthesis of silver and gold are also discussed. Basic properties of colloidal solutions are described. Also a historical overview of nanoparticles are briefly introduced together with short introduction to specific properties of nanoparticles and their solutions.
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25

Nadutov, V. M., A. O. Perekos, V. V. Kokorin, S. M. Konoplyuk, T. V. Yefimova, and V. P. Zalutskiy. "Effect of Electric-Spark Dispergation on Magnetic and Electrical-Transport Properties of Heusler Cu—Mn—Al Alloy." METALLOFIZIKA I NOVEISHIE TEKHNOLOGII 36, no. 12 (September 8, 2016): 1679–94. http://dx.doi.org/10.15407/mfint.36.12.1679.

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26

Leontyeva, D. V., I. N. Leontyev, M. V. Avramenko, Yu I. Yuzyuk, Yu A. Kukushkina, and N. V. Smirnova. "Electrochemical dispergation as a simple and effective technique toward preparation of NiO based nanocomposite for supercapacitor application." Electrochimica Acta 114 (December 2013): 356–62. http://dx.doi.org/10.1016/j.electacta.2013.10.031.

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27

Domnina, Yu M., S. A. Kedik, V. V. Suslov, E. A. Shnyak, and S. S. Kryukova. "PREPARATION OF POLYMERIC NANOPARTICLES BY FLOW ULTRASONIC EMULSIFICATION." Fine Chemical Technologies 11, no. 6 (December 28, 2016): 63–67. http://dx.doi.org/10.32362/2410-6593-2016-11-6-63-67.

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The work is dedicated to the production of polymer suspensions using ultrasonic dispergation in a flow mode. An apparatus was designed on the basis of a Russian flow ultrasonicator. The applicability of this apparatus for obtaining aqueous dispersions of polymeric micro- and nanoparticles by means of one-step emulsification followed by solvent extraction / evaporation was demonstrated. The influence of the process parameters on the characteristics of the obtained suspensions was studied. The particle size distribution and the average size of the resulting particles were evaluated by using Delsa Nano S, Beckman Coulter laser analyzer (USA). The dependence of the average diameter of the suspension particles on the stabilizer concentration and on the change of the phases feed rate was shown. When polyvinyl alcohol was used as a stabilizer in the concentration range 0.5-2%, the average particle size was 30-400 nm. The feed rates of the aqueous and organic phases affect the nature of the particle size distribution.
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28

Perеkоs, А. О., О. D. Rud, V. Z. Vоynash, А. V. Gіlchuk, М. О. Gоlyatkinа, V. V. Bоndаr, S. М. Kоnоplyuk, et al. "Magnetic Properties of Cu/Cu$_2$O Nanoparticles of ‘Nucleus–Shell’ Class Prepared by Electric-Spark Dispergation Method." METALLOFIZIKA I NOVEISHIE TEKHNOLOGII 42, no. 11 (December 21, 2020): 1481–97. http://dx.doi.org/10.15407/mfint.42.11.1481.

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29

Gyurácz, József, Sándor Kalmár, and Réka Baráth. "Local abundance and spatial distribution of some migratory birds during post-breeding period." Ornis Hungarica 20, no. 1 (June 1, 2012): 50–58. http://dx.doi.org/10.2478/orhu-2013-0005.

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AbstractThe local abundance and spatial distribution of the short- to medium-distance migratory and daytime stopover passerines (Robin Erithacus rubecula, Blackcap Sylvia atricapilla, Chiffchaff Phylloscopus collybita, Blue tit Parus caeruleus, Great tit P. major) were studied in a West Hungarian stopover ground during post-breeding season. The dispergation index of all migratory bird species revealed clumped distribution both in „smallest annual capture year” (abb. SACY) and the „largest annual capture year” (abb. LACY). According to the PCA the spatial occurrences of Blackcap, Blue tit and Great tit captured in LACY showed significantly higher concentration than of those migrating in SACY. The studied species appeared in all four habitats (bushy, forest, grassland, marsh) of the study stopover area, but their clumped spatial distribution showed habitat preference. The abundance-dependent shift of habitat selection was found only in Great tit, the most of them captured in SACY concentrated in grassland with bushy, while the ones captured in LACY grouped in forest habitat type. Blackcaps were grouped the grassland with bushes habitat type where many Dwarf elder (Sambucus ebulus) bushes were available during autumn migration.
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30

Makarewicz, Edwin, and Krzysztof Jan´czak. "The influence of organic diluents and solvents on the stability of PVC plastisol water dispersions." Polish Journal of Chemical Technology 9, no. 1 (January 1, 2007): 43–50. http://dx.doi.org/10.2478/v10026-007-0011-1.

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The influence of organic diluents and solvents on the stability of PVC plastisol water dispersions The work presents the research, the aim of which is to specify the influence of organic diluents and solvents such as xylene, toluene, n-butyl acetate and butanol as well as cyclohexanone on the stability of water dispersions of the PVC plastisol containing various surface-active agents (SAA). The applied surfactants were characterised by a specific ethoxylation number, molecular mass, the Hildebrand parameter, hydrophilic-hydrophobic balance, surface activity, the limiting viscosity number, the Haller interaction constant, the limiting equivalent conductivity and the Kohlrausch-Onsager equation "b" constant. Basing on the molar refraction and the Hildebrand parameter, the interactions between the plastisol constituents and the constituents of water dispersions of the PVC plastisol were established. The sedimentation tests on the PVC plastisol water dispersions stabilized by various surface-active agents with an organic diluent or solvent added indicated that the addition resulted in the dispergation yield, a reduction in the PVC plastisol molecular size in water dispersion and the increased Huggins interaction constant, showing both surface lyophilisation and higher adsorption of surface-active agents.
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31

Brożek, Marian, and Anna Młynarczykowska. "The distribution of air bubble size in the pneumo-mechanical flotation machine . Rozkład wielkości pęcherzyków powietrza w pneumo-mechanicznej maszynie flotacyjnej." Archives of Mining Sciences 57, no. 3 (December 1, 2012): 729–40. http://dx.doi.org/10.2478/v10267-012-0047-9.

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Abstract The flotation rate constant is the value characterizing the kinetics of cyclic flotation. In the statistical theory of flotation its value is the function of probabilities of collision, adhesion and detachment of particle from the air bubble. The particle - air bubble collision plays a key role since there must be a prior collision before the particle - air bubble adhesion happens. The probability of such an event to occur is proportional to the ratio of the particle diameter to the bubble diameter. When the particle size is given, it is possible to control the value of collision probability by means of the size of air bubble. Consequently, it is significant to find the effect of physical and physicochemical factors upon the diameter of air bubbles in the form of a mathematical dependence. In the pneumo-mechanical flotation machine the air bubbles are generated by the blades of the rotor. The dispergation rate is affected by, among others, rotational speed of the rotor, the air flow rate and the liquid surface tension, depending on the type and concentration of applied flotation reagents. In the proposed paper the authors will present the distribution of air bubble diameters on the grounds of the above factors, according to the laws of thermodynamics. The correctness of the derived dependences will be verified empirically.
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32

Mencik, Premysl, Veronika Melcova, Sona Kontarova, Radek Prikryl, Dagmara Perdochova, and Martina Repiska. "Biodegradable Composite Materials Based on Poly(3-Hydroxybutyrate) for 3D Printing Applications." Materials Science Forum 955 (May 2019): 56–61. http://dx.doi.org/10.4028/www.scientific.net/msf.955.56.

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Presented work deals with the development of bio-source and biodegradable composite material for 3D printing. Polymer blend based on poly (3-hydroxybutyrate) (60 wt%) and poly (lactic acid) (25 wt%) plasticized by tributyl citrate (15 wt%) was used as a matrix. This base blend was filled with 10 vol% of kaolin or limestone. Zinc stearate was used for the surface treatment of the limestone samples. The mechanical and thermal properties of the composites, as well as their behavior during 3D printing process, were compared with unfilled blend and commercial poly (lactic acid) based 3D printing filament. Warping behavior, one of the main problems of 3D printing materials, was studied by means of warp coefficient. Cross-sections of specimens 3D printed under the same processing conditions were observed by the optical microscope. In the case of composite samples, individual filaments were separated. Despite the separation, composites filled with kaolin and with surface treated limestone exhibited satisfying mechanical properties. Scanning electron microscopy analysis confirmed good particle distribution of the samples with kaolin and surface treated limestone. No significant particle agglomerates were formed in the composites with limestone proving good dispergation ability of zinc stearate. Thermogravimetric analysis and Differential scanning calorimetry analysis showed no degradable effect of the used fillers on base polymer matrix. Observed results indicate that kaolin and surface treated limestone are suitable fillers for the bio-source composites used for 3D printing.
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33

Maiboroda, V. S., O. O. Belajev, D. Yu Dzhulii, and I. V. Slobodianiuk. "AISI 1045 Steel Flat Surfaces Machining Using the Magneto-Abrasive Method." Journal of Engineering Sciences 7, no. 1 (2020): A1—A7. http://dx.doi.org/10.21272/jes.2020.7(1).a1.

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The results of the study of using the end-type heads based on permanent magnets for polishing flat surfaces of ferromagnetic parts on standard metal-working equipment are presented in the work. The possibility of a highly efficient achievement of the roughness of flat surfaces up to Ra < 0.05 μm with the initial Ra > 1–2 μm with removing of the heredity of the machining in the form of microwaves obtained in the face milling operation was shown. Based on the results of the analysis of the process of dispergation of the material was analyzed the influence of the magnetic field gradient the intensity of the magneto-abrasive machining of flat ferromagnetic surfaces by heads, which form a magneto-abrasive tool in the shape of a “brush” and “half of torus”. The influence of technological process parameters: the rotation speed of the working heads, the sizes of the working gap, the technological feed on the character of the change in the microgeometry of the machined surface were investigated. The machining conditions, under which occur the preferential machining of micro peaks or micro valleys on a rough surface, were identified. It was determined that the rational conditions of the magneto-abrasive machining of flat ferromagnetic surfaces are: the rotation speed of the working heads 900 rpm, the gap size between the machined surface and the working surface of the head 2.5–4.0 mm and the working feed 10–15 mm/min. Keywords: finishing, roughness, polishing, permanent magnet, magneto-abrasive tool.
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34

Lavrynenko, O. M., M. N. Zahornyi, M. M. Bataiev, Yu M. Bataiev, O. Yu Pavlenko, and O. A. Kornienko. "UV irradiation effect on paramagnetic properties of nanomagnetite doped with Ag(I) and Au(III) cations." Himia, Fizika ta Tehnologia Poverhni 11, no. 4 (December 30, 2020): 508–15. http://dx.doi.org/10.15407/hftp11.04.508.

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Nowadays nanocomposites based on magnetite doped with noble metal cations or core&shell type nanocomposites including superparamagnetic core and precious metal shells are widely used in new kinds of biocompatible materials creation. The following structures are characterized by unique complexes of physical-chemical properties. The noble metal coatings formed on the magnetite nanoparticles surface supply their corrosive biological media stabilization and effects on electrical, magnetic, catalytic, optical properties of core&shell type nanocomposites as well. This work studies the effect of UV irradiation (253 nm) on the paramagnetic characteristics of biocompatible core&shell type nanocomposites based on magnetite and precious metals (silver, gold). Nanoparticles of magnetite and core&shell type composites Fe3O4&Ag0 and Fe3O4&Au0 were formed under the rotation-corrosion dispergation conditions on the steel 3 (St3) surface contacting with distilled water and aqueous solutions of silver nitrate and tetrachloroauric acid at a free flow of oxygen into the reaction zone. Solutions of precious metals contained from 0.5 to 20 mg/dm3 of Ag(I) and Au(III) aquaforms. The composite nanoparticles were characterized using X-ray diffraction data, scanning electron microscopy and electron paramagnetic resonance spectroscopy. Because of expecting photocatalytic activity of as-prepared nanocomposites, we performed their illumination by ultraviolet irradiation. The effect of UV irradiation (253 nm) on the paramagnetic characteristics of biocompatible core&shell nanocomposites based on magnetite and precious metals (silver, gold) was studied by EPR analysis. The obtained data suggests that after UV irradiation the contribution of Fe2+ spins increases, the band gap for Fe3O4 decreases, the rate of charge redistribution at the oxide-metal interface increases, the number of spins in the composite increases. The study of the occurrence of paramagnetic centers mechanism in the nanocomposites based on magnetite and precious metals may be relevant for determining their bactericidal and photocatalytic activity. Also, such nanocomposites can be used in the creation of technical means for prevention of the spread of infectious diseases in the transport, public places, and hospitals.
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35

Лебедев (Lebedev), Иван (Ivan) Владимирович (Vladimirovich), Яков (Yakov) Владимирович (Vladimirovich) Казаков (Kazakov), Дмитрий (Dmitrij) Германович (Germanovich) Чухчин (Chukhchin), and Кристина (Kristina) Александровна (Аleksandrovna) Романенко (Romanenko). "THE ROLE OF FIBERS SURFACE IN DEVELOPMENT OF PAPERMAKING PROPERTIES OF TECHNICAL PULP IN THE REFINING PROCESS." chemistry of plant raw material, no. 2 (January 15, 2018): 207–16. http://dx.doi.org/10.14258/jcprm.2018022248.

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The aim of this work was to determine the relationship between the values of the fiber specific surface and papermaking properties of the pulp that are changing in the refining process. Quality data on the status and quantitative data on the value of the fibers specific surface for softwood and hardwood kraft pulp with different lignin content and different degree of refining were obtained. When preparing samples was used technology of cryofixation and freeze-drying the wet laboratory samples. The SEM-images of the cellulose fibers surface in the state such as for the sheet forming, obtained on scanning electron microscope ZEISS "SIGMA VP". The SEM-images shows just noticeable difference in development of the fibers surface in the beating process. This is manifested in an increase in the number of microfibrils on the fiber surface. Quantitative data were obtained on the automatic analyzer of the specific surface magnitude ASAP. A visually apparent increase of the surface when beating technical cellulose confirmed quantitatively. The value of the specific surface area increased from 2 m2/g for cellulose after the dispergation into pulp of up to 4...6 m2/g after refining up to 60 °SR. Removal of lignin from cellulose promotes more intensive development of the surface during refining.For different kinds of pulp, similar dependences of physical-mechanical properties (interfiber bonding forces, bulk density, modulus of elasticity) of laboratory samples and specific surface data, which change during refining, are established.The main influence on the change in the structural-dimensional and elastic properties of paper during refining is exerted by an increase in the content of microfibrils on the outer surface of the fibers. The tightness of the correlation and the nature of the observed dependence depends on the wood species from which the cellulose is derived, on the lignin content of the samples, and on the drying method. For softwood pulp, the tightness of the relationship is higher than for hardwood pulp.
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36

Shkolnyi, М. P., О. М. Bortnіak, І. І. Steliga, H. D. Lialiuk-Viter, and V. Ya Shymanskyi. "The Increase of the Operation Efficiency of Water Supply Wells on the Production Facilities of the Oil and Gas Complex." Prospecting and Development of Oil and Gas Fields, no. 4(73) (December 30, 2019): 16–23. http://dx.doi.org/10.31471/1993-9973-2019-4(73)-16-23.

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Water for oil pump stations and compressor stations of the main hydrocarbon carriers transmission systems, as well as for most other production facilities of the oil and gas complex is usually supplied from the underground sources. In this case, the function of water intake structures is performed by the bored wells or special wells. As most of them are located in quick ground, they require the use of filters of various designs. In the process of water supply systems operation, wells filters and pre-filter zones of aquifers are contaminated with mechanical particles as well as with the depositions of calcium salt, magnesium salt, silicon salt and other elements dissolved in under-ground waters. It inevitably leads to the increase in hydraulic resistance and, accordingly, to the decrease in wa-ter flow and water intakes productivity. The construction of new buildings requires additional substantial capital investments; therefore it is considered to be economically impracticable and is used very rarely. The more rational way to restore the well flow rate is to clean the filters and the aquifers pre-filter zones off the clogging. It gives a possibility to get a significant economic effect. The analysis of the existing methods and means of water supply wells recovery shows that despite the urgent need to improve water supply and to use groundwater rationally, the search for the most effective methods of regeneration of water take systems is still ongoing. Nowadays, the devel-opment of treatment modes for filters and the prefilter zone of aquifers implies the use of approaches that summa-rize the experience of previous methods which need further theoretical and experimental justification. The authors offer a more effective method for the destruction and dispergation of colmatation deposits. It requires the creation of the vibrational impact inside the filter as well as the creation of a powerful filtration flow of alternating direc-tion by implementing a multi-regulated explosion of the steam-and-gas mixture. It gives an opportunity to use it under a wide range of hydrogeological conditions, as well as in the wells equipped with filters of different types. The suggested method is simple and cost-efficient. In order to find scientifically substantiated criteria for the se-lection of optimal modes of wells treatment using this method, the authors have made a series of research. One of the main purposes of the studies is to determine the nature of the distribution and the parameters of elastic hydro-dynamic oscillations in the aquifer which are caused by the explosion of steam-and-gas mixture in the filter area of the water supply well.
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37

"Labordispergiergerät auch für Medien mit hoher Viskosität / Laboratory Dispergator also for Highly Viscous Media." Tenside Surfactants Detergents 24, no. 6 (December 1, 1987): 327. http://dx.doi.org/10.1515/tsd-1987-240608.

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38

Sobolev, Konstantin, Ismael Flores, Leticia M. Torres, Enrique L. Cuellar, Pedro L. Valdez, and Elvira Zarazua. "Performance of Cement Systems with Nano-SiO2 Particles Produced Using Sol-gel Method." MRS Proceedings 1276 (2010). http://dx.doi.org/10.1557/proc-1276-21.

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AbstractThe reported research examines the effect of 5–70 nm SiO2 nanoparticles on the mechani-cal properties of nanocement materials. The strength development of portland cement with nano-SiO2 and superplasticizing admixture is investigated. Experimental results demonstrate an in-crease in the compressive strength of mortars with SiO2nanoparticles. The distribution of nano-SiO2 particles within the cement paste plays an essential role and governs the overall perfor-mance of these products. Therefore, the addition of a superplasticizer is proposed to facilitate the distribution of nano-SiO2 particles. The application of effective superplasticizer and high-speed dispergation are found to be very effective dispersion techniques that improve the strength of su-perplasticized portland cement mortars, reaching up to 63.9 MPa and 95.9 MPa after aging dur-ing 1 and 28 days, respectively. These values compare favorably with the observed compressive strengths of reference portland cement mortars of 53.3 MPa and 86.1 MPa. It is concluded that the effective dispersion of nanoparticles is essential to obtain the composite materials with im-proved performance.
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39

V. Gamaga, Varvara, Igor V. Iudaev, Svetlana A. Rodionova, Natalya A. Sokolova, and Vasiliy E. Kostin. "Efficiency of Application of Liquid Fertilizer Gumavit When Sprouting Seeds." KnE Life Sciences, April 5, 2021. http://dx.doi.org/10.18502/kls.v0i0.8928.

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The object of this study was Gumavit, a liquid humic fertilizer based on peat. This fertilizer is obtained by cavitation dispergation of peat in a shock pulse generator and subsequent alkaline extraction from a water-peat mixture of humic acids. This study examined the effect of Gumavit on the germination energy and germination capacity of barley seeds, wheat and tomatoes, as well as its effect on plant growth and development. It was found that Gumavit did not adversely affect the germination energy and germination capacity of seeds of grain crops and tomatoes. The use of a 0.2% (of humic acids - HA) Gumavit solution had a positive effect on the sowing quality of the studied cultures’ seeds. The use of a 0.01% (of HA) solution of Gumavit to moisten sand and germinate seeds after 14 days had a positive effect on the length and mass of Favorit wheat grain sprouts; as well as a positive effect on the root mass of Favorit and Kamyshanka-3 wheat, Volgogradskii-12 barley, Volgogradskii 5/95 tomatoes and Dar Zavolzhia tomatoes. The increase in the root mass of the studied cultures can be explained by the absorption of a small fraction of humic substances by the roots of these plants, leading to an increase in the number of lateral roots and their root hairs. Keywords: Gumavit, seed treatment, germination energy, germination capacity, grain crops, tomatoes, moistening sand, length and mass of sprouts
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