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Online since: July 2017
Authors: Yuliya Shanenkova, Alexander Ivashutenko, Ivan Shanenkov, Alexander Sivkov, Kirill Firsov, Iliyas Rakhmatullin
Creating a Varistor Based on Zinc Oxide (ZnO) Powder Obtained by Plasma Dynamic Method
Kirill Firsov1,a*, Aleksander Sivkov2,b, Ivan Shanenkov3,c,
Iliyas Rakhmatullin4,d, Alexander Ivashutenko5,e and Yuliya Shanenkova6,f.
1,2,3,4,5,6National research Tomsk Polytechnic University, Russia, Tomsk
afirsovkirill@bk.ru, bSivkovAA@mail.ru, cswordi@list.ru, draim@tpu.ru eivaschutenko@mail.ru, fjulia_kolganova@mail.ru
Keywords: hexagonal zinc oxide, nanoparticles, single-crystalline particle structure, synthesis, plasma accelerator
Abstract.
These methods have some disadvantages, such as high expenditure costs, long synthesis processes as well as a low quality of synthesized Zinc Oxide structures.
This work shows a unique method for obtaining ultradispersed ZnO powders with hexagonal structure in a high-speed pulse plasma jet, which is generated by coaxial magnetoplasma accelerator (CMPA).
According to the obtained TEM-images, crystalline particles in the product have a single-crystalline structure with normal hexagonal syngony, which was also found by XRD analysis of the synthesized material.
Journal of Materials Chemistry, 17, January 2012 [4] Alexander Sivkov, Alexander Ivashutenko, Yuliya Shanenkova, Ivan Shanenkov: Plasma dynamic synthesis and obtaining ultradispersed zinc oxide with single-crystalline particle structure.
These methods have some disadvantages, such as high expenditure costs, long synthesis processes as well as a low quality of synthesized Zinc Oxide structures.
This work shows a unique method for obtaining ultradispersed ZnO powders with hexagonal structure in a high-speed pulse plasma jet, which is generated by coaxial magnetoplasma accelerator (CMPA).
According to the obtained TEM-images, crystalline particles in the product have a single-crystalline structure with normal hexagonal syngony, which was also found by XRD analysis of the synthesized material.
Journal of Materials Chemistry, 17, January 2012 [4] Alexander Sivkov, Alexander Ivashutenko, Yuliya Shanenkova, Ivan Shanenkov: Plasma dynamic synthesis and obtaining ultradispersed zinc oxide with single-crystalline particle structure.
Online since: April 2009
Authors: Ignacy Jakubowicz, Nazdaneh Yarahmadi
The development of polymer-layered silicate nanocomposites (PNCs) includes a long list
of different possible components such as polymers, nano-additives, and co-additives, together with
surface chemistry and various processing conditions.
The use of relatively fast analytical methods such as TGA, HR-SEM and cone calorimetry gives valuable information about the properties and structure without compromising the level of characterization.
Peter Sjövall from SP Chemistry and Materials Technology for the SEM analyses, and Mrs.
The use of relatively fast analytical methods such as TGA, HR-SEM and cone calorimetry gives valuable information about the properties and structure without compromising the level of characterization.
Peter Sjövall from SP Chemistry and Materials Technology for the SEM analyses, and Mrs.
Online since: October 2023
Authors: Harshit Ekka, Srijan Choudhary, Claritus D. Souza, Basil Joy, S. Gowtham Sanjai, Vivek Jaiswal
Numerous minute adjustments to the process of creating auto particles cause materials molecular structure to alter.
Creating new crystal structures alters the characteristics of the original substance [2, 3].
Thus XRD analysis revealed that the material has a crystalline phase structure.
The X-ray diffraction (XRD) test was used to determine the phase structure of the raw material.
[17] Amir Ljadi, Behzad Nayebi, Nader Parvin, Ali Kaflou, “Characteristics of porous SS316L: Influences of the Sn additive on the interfacial phenomena during the pressureless sintering” Materials Chemistry and Physics, vol. 295, 127100, 2023
Creating new crystal structures alters the characteristics of the original substance [2, 3].
Thus XRD analysis revealed that the material has a crystalline phase structure.
The X-ray diffraction (XRD) test was used to determine the phase structure of the raw material.
[17] Amir Ljadi, Behzad Nayebi, Nader Parvin, Ali Kaflou, “Characteristics of porous SS316L: Influences of the Sn additive on the interfacial phenomena during the pressureless sintering” Materials Chemistry and Physics, vol. 295, 127100, 2023
Online since: June 2021
Authors: Hao Jiang, Yun Gong Cai, Zeng Qi Zhao, Hong Fei Guo
Graphene is a new type of carbon material with a single atomic layer thickness, which has a unique structure and excellent physical and chemical properties.
The core position of the discipline is the field of materials science and chemistry, indicating that graphene coatings have good development prospects in the field of materials science and chemistry.
Graphene has a unique structure and lubricating properties, so that it can show good friction and wear performance as an additive.
Shen, Effect of thermal peeling temperature on the structure and electrical properties of grapheme, J.
Chen, et al, Interfacial structure and tribological behaviours of epoxy resin coating reinforced with graphene and graphene oxide, J.
The core position of the discipline is the field of materials science and chemistry, indicating that graphene coatings have good development prospects in the field of materials science and chemistry.
Graphene has a unique structure and lubricating properties, so that it can show good friction and wear performance as an additive.
Shen, Effect of thermal peeling temperature on the structure and electrical properties of grapheme, J.
Chen, et al, Interfacial structure and tribological behaviours of epoxy resin coating reinforced with graphene and graphene oxide, J.
Online since: January 2013
Authors: Ping Chen, Meng Meng Li, Bin Sun, Yun Ze Long, Xiu Jie Hu, Ying Qun Qi, Shu Yun Zhou
China
2Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P.
China 3College of Chemistry, Chemical Engineering & Environment, Qingdao University, Qingdao 266071, P.
Particularly, the structure of the synthesized composites was influenced by the additive during reaction process.
Fig. 2 shows the microscopic morphology and structure of the as-synthesized nanocables.
Through controlling experimental condition, two kinds of composite structures could be obtained, Au-PEDOT/PSS nanowires and Au (PVP)-PEDOT/PSS nanocables.
China 3College of Chemistry, Chemical Engineering & Environment, Qingdao University, Qingdao 266071, P.
Particularly, the structure of the synthesized composites was influenced by the additive during reaction process.
Fig. 2 shows the microscopic morphology and structure of the as-synthesized nanocables.
Through controlling experimental condition, two kinds of composite structures could be obtained, Au-PEDOT/PSS nanowires and Au (PVP)-PEDOT/PSS nanocables.
Online since: December 2008
Authors: Hiroaki Nakashima, Seiichi Koyama, Yusuke Mori, Yoshiyuki Sugahara
Preparation of Precursors for Aluminum Nitride-Based Ceramic
Composites from Cage-type and Cyclic Building Blocks
Yoshiyuki Sugahara, Hiroaki Nakashima, Seiichi Koyama, and Yusuke Mori
Department of Applied Chemistry, Waseda University,
Ohkubo-3, Shinjuku-ku, Tokyo 169-8555, JAPAN
ys6546@waseda.jp
Keywords: Polymer-derived ceramics, aluminum nitride, ceramic composite
Abstract.
Thus, it is important to achieve both high precursor solubility and a moderate ceramic yield, and it is therefore essential to design for appropriate precursor structures.
Since highly cross-linked structures, which are advantageous for achieving high ceramic yields, generally exhibit poor solubility, our strategy for designing precursor structures is based on limiting the extent of cross-linking reactions during preparation of the precursors and conversion of the precursors into cross-linked structures during pyrolysis.
We have consequently developed an organic-to-inorganic conversion process for conversion of cage-type compounds with Al-N backbones, poly(alkyliminoalane)s, into aluminum nitride.[2] Despites their oligomeric structures, these precursors exhibit moderate ceramic yields, since the Al-N bonds are cleaved at relatively low temperature to form nitrogen terminals with lone pairs, leading to cross-linking reactions during pyrolysis.
Thus, it is important to achieve both high precursor solubility and a moderate ceramic yield, and it is therefore essential to design for appropriate precursor structures.
Since highly cross-linked structures, which are advantageous for achieving high ceramic yields, generally exhibit poor solubility, our strategy for designing precursor structures is based on limiting the extent of cross-linking reactions during preparation of the precursors and conversion of the precursors into cross-linked structures during pyrolysis.
We have consequently developed an organic-to-inorganic conversion process for conversion of cage-type compounds with Al-N backbones, poly(alkyliminoalane)s, into aluminum nitride.[2] Despites their oligomeric structures, these precursors exhibit moderate ceramic yields, since the Al-N bonds are cleaved at relatively low temperature to form nitrogen terminals with lone pairs, leading to cross-linking reactions during pyrolysis.
Online since: July 2012
Authors: Si Long, Guo Hui Li, Xin Wu
Introduction
Fractal Geometry, created and developed by French mathematician B.B.Mandelbrot, has been widely applied in many fields, such as physics, chemistry, biology, physiology, earth science, metallurgy, materials science, sociology, etc; and many results can be gained in these fields.
Its structure is complex, consisting of clastic structure and grain structure.
The clastic structure is composed of particles, micrite matrix and sparry cements.
Its structure is micritic structure and compact block structure, and occasionally the dolomitic joints can be seen in it.
(in Chinese) [7] He Chengzu, Hua Mingqi: Fractal geometry description of reservoir pore structure.
Its structure is complex, consisting of clastic structure and grain structure.
The clastic structure is composed of particles, micrite matrix and sparry cements.
Its structure is micritic structure and compact block structure, and occasionally the dolomitic joints can be seen in it.
(in Chinese) [7] He Chengzu, Hua Mingqi: Fractal geometry description of reservoir pore structure.
Online since: January 2006
Authors: Andrew B. Yaroslavtsev, I.A. Stenina, M.N. Kislitsyn, S.M. Haile, I.Yu. Pinus
Yaroslavtsev
1,a
1
Kurnakov Institute of General and Inorganic Chemistry RAS, 31 Leninsky pr., 119991 Moscow
Russia
2
California Institute of Technology, 1200 E.
Materials with NASICON structure [i.e.
The surrounding of the latest ones forms the structure of rhombohedral phase.
This situation is similar to the formation of domain structure in ferromagnetic.
Solid State Chemistry Vol. 83 (1989), p. 78 7.
Materials with NASICON structure [i.e.
The surrounding of the latest ones forms the structure of rhombohedral phase.
This situation is similar to the formation of domain structure in ferromagnetic.
Solid State Chemistry Vol. 83 (1989), p. 78 7.
Online since: October 2010
Authors: Xin Wang, Hua Lan Wang, Qing Li Hao, Jiao Tian
Fabrication of the Ordered and Sandwich Structured Polyaniline/graphene nanoarrays
Qingli Hao1a*, Jiao Tian1b, Hualan Wang1c , and Xin Wang1d
1 Key Laboratory of Soft Chemistry and Functional Materials, Ministry of
Education, Nanjing University of Science and Technology, Nanjing, 210094, PR China.
Herein, we have fabricated a novel hybrid material with sandwich structure, graphene/polyaniline nanoarray, by a facile approach in isopropanol / water media.
Such a structure of ordered array can be further observed from the SEM image in Fig.1 (C).
In order to describe the structure of the composites, the FT-IR spectrum is used.
For GEP100, the peaks at 1614,1344 and 1488 cm-1 reveal the structure of doped PANI.
Herein, we have fabricated a novel hybrid material with sandwich structure, graphene/polyaniline nanoarray, by a facile approach in isopropanol / water media.
Such a structure of ordered array can be further observed from the SEM image in Fig.1 (C).
In order to describe the structure of the composites, the FT-IR spectrum is used.
For GEP100, the peaks at 1614,1344 and 1488 cm-1 reveal the structure of doped PANI.
Online since: February 2014
Authors: Xiao Pin Wang, Yi Hui Li, Cou Hua Zhu
Magnification factor of 3000
Figure 2.1indicates the surface structure of activated carbon.
Treatment of Atmosphere on FeSO4-ACF Structure and Adsorption Properties[J].
Chemosphere, 2002, 46: 491-577 [8] Xia Lijiang, Environmental Chemistry.
Research on the Structure and Surface Properties of Activated Carbon and the ammonia synthesis using its Loading Ruthenium Catalysts.
Fiber Pore Structure Controlling and Surface Modification, Ion Exchange and Adsorption, 1997,13 (4) :353-358
Treatment of Atmosphere on FeSO4-ACF Structure and Adsorption Properties[J].
Chemosphere, 2002, 46: 491-577 [8] Xia Lijiang, Environmental Chemistry.
Research on the Structure and Surface Properties of Activated Carbon and the ammonia synthesis using its Loading Ruthenium Catalysts.
Fiber Pore Structure Controlling and Surface Modification, Ion Exchange and Adsorption, 1997,13 (4) :353-358