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Online since: July 2016
Authors: Y.W. Hu, Yang Min Ma, Hui Rong He, Xia Kong
Synthesis and Antibacterial Activities of Ag/ZnO Nanoparticles
Yawei Hua, Huirong He, Xia Kong, Yangmin Ma
College of Chemistry and Chemical Engineering, Shaanxi University of Science and Technology, Xi’an, Shaanxi 710021, P.
The phase, the crystallographic structure and the surface topography of the Ag/ZnO nanoparticles were charactered by XRD and SEM.
The phase and the crystallographic structure of the Ag/ZnO samples were charactered by an X-ray diffractometer (XRD) with Cu Kα radiation (λ = 0.154 nm) at a scanning rate of 8°·min-1 ranging from 30º to 80º.
The surface topography and structures of the Ag/ZnO samples were characterized by a scanning electron microscope (SEM).
Moreover, the peaks of ZnO with 2.5, 5, 7.5 mol% Ag show extra peaks 38.16º, 44.32º and 64.46º, which can be indexed to diffraction from the (400), (111), (200) and (220) of the cubic structure of Ag (JCPSD card No.65-2871).
The phase, the crystallographic structure and the surface topography of the Ag/ZnO nanoparticles were charactered by XRD and SEM.
The phase and the crystallographic structure of the Ag/ZnO samples were charactered by an X-ray diffractometer (XRD) with Cu Kα radiation (λ = 0.154 nm) at a scanning rate of 8°·min-1 ranging from 30º to 80º.
The surface topography and structures of the Ag/ZnO samples were characterized by a scanning electron microscope (SEM).
Moreover, the peaks of ZnO with 2.5, 5, 7.5 mol% Ag show extra peaks 38.16º, 44.32º and 64.46º, which can be indexed to diffraction from the (400), (111), (200) and (220) of the cubic structure of Ag (JCPSD card No.65-2871).
Online since: February 2022
Authors: Marina G. Kovaleva, Sergey Zaitsev, Dmitriy Prokhorenkov, Andrey Skiba, Michael Limarenko, Viacheslav V. Sirota
The structure of a metal-ceramic composite target was studied by scanning electron microscopy.
In most cases, the above methods have serious drawbacks: high residual porosity, heterogeneous volume, chemical composition and structure, large content of impurities.
The structure and distribution of elements in the coating material was studied by raster electron microscopy (SEM, TESCAN MIRA 3 LMU, Czech Republic).
Shtansky Ti-Cr-BN coatings prepared by pulsed cathodic-arc evaporation of ceramic TiCrB target produced by SHS Protection of Metals and Physical Chemistry of Surfaces 49(6) (2013) 677-681 [7] V.V.
Titkov Effect of structure on properties of Al2O3 and Al (or Ti) mechanical mixture coatings produced by multichamber detonation spraying method Paton Weld.
In most cases, the above methods have serious drawbacks: high residual porosity, heterogeneous volume, chemical composition and structure, large content of impurities.
The structure and distribution of elements in the coating material was studied by raster electron microscopy (SEM, TESCAN MIRA 3 LMU, Czech Republic).
Shtansky Ti-Cr-BN coatings prepared by pulsed cathodic-arc evaporation of ceramic TiCrB target produced by SHS Protection of Metals and Physical Chemistry of Surfaces 49(6) (2013) 677-681 [7] V.V.
Titkov Effect of structure on properties of Al2O3 and Al (or Ti) mechanical mixture coatings produced by multichamber detonation spraying method Paton Weld.
Online since: November 2016
Authors: Li Rong Liu, Shuo Han, Ming Jun Zhang, Yi Fan Pu, Zhi Jiang Peng
The results show that in DZ125 directionally solidified superalloy, the MC carbide is either smooth platelet or bone-shaped structure with nodes in morphology in as-cast state, which is rich in Ta, Ti and Hf.
Carbides is an important strengthening phase in directionally solidified Ni-base superalloys, however the carbides can transform during heat treatment or service, which can alter the original structure, morphology and distribution of carbides, thereby, producing variations in the properties of the alloy[1–6].
Figure 1 Morphology of carbides as -cast state in DZ125 alloy (c) Dendrite structure as cast state; (b) low magnification as-cast state; (c) high magnification as-cast state (d) High magnification of bugles as-cast state; In this alloy, the content of Hf is 1.52wt%, as shown in Table 1.
Reference [9] show that the precipitated phase is M6C carbide with complicated fcc structure, whose lattice constants equal to 11.78nm.
Effect of alloying chemistry on MC carbide morphology in modified RR2072 and RR2086 SX superalloys.
Carbides is an important strengthening phase in directionally solidified Ni-base superalloys, however the carbides can transform during heat treatment or service, which can alter the original structure, morphology and distribution of carbides, thereby, producing variations in the properties of the alloy[1–6].
Figure 1 Morphology of carbides as -cast state in DZ125 alloy (c) Dendrite structure as cast state; (b) low magnification as-cast state; (c) high magnification as-cast state (d) High magnification of bugles as-cast state; In this alloy, the content of Hf is 1.52wt%, as shown in Table 1.
Reference [9] show that the precipitated phase is M6C carbide with complicated fcc structure, whose lattice constants equal to 11.78nm.
Effect of alloying chemistry on MC carbide morphology in modified RR2072 and RR2086 SX superalloys.
Online since: June 2014
Authors: Feng De Tang, Yan Li Yi, Jie Wang
It was concluded that the addition of SSC could enhance the soil’s fertility and improve the soil’s physical structure,it was an effective disposition way for sewage sludge to be used as the organic fertilizer in soil.
Materials and Methods Materials The sewage sludge used in the experiment was collected from the Northern Shenyang Wastewater Treatment Plant,the sewage sludge had been treated through aerobic composting.The composted sewage sludge had a loose structure,small bulk density,which could be seen as a good fertilizer.The sewage sludge compost’s characters were:the concentrations of available N,P,K and OM were 4.27 g∙kg-1,174.48 mg∙kg-1,182.50 mg∙kg-1 and 17.7% ,the pH value was 6.40,the electrical conductivity was 4.25 ms∙cm-1.
The conclusions were as follows:Along with the increase of application ratio of SSC,the soil’s structure became more loose,the porosity increased,and bulk density reduced,the proportion of physical clay in soil increased,the soil electrical conductivity increased.On the other hand,the concentrations of soil nutritious elements of OM,TN,TP,available N,available P and available K increased apparently with the increase of application dosage of SSC.SSC application could protect the soil from erosion and stimulate C and N cycling,thereby reducing pollution by runoff and leaching.
We concluded that the application of SSC improved the soil’s physical structure and fertility,improved the soil’s physical,chemical and biological characters,therefore, SSC had a good application prospect in the aspect of soil improvement,this practice is inexpensive and easy to carry out.
[10] Rukun Lu,Analysis Methods for Soils and Agricultural Chemistry.Beijing:China Agric.Sci.Technol.
Materials and Methods Materials The sewage sludge used in the experiment was collected from the Northern Shenyang Wastewater Treatment Plant,the sewage sludge had been treated through aerobic composting.The composted sewage sludge had a loose structure,small bulk density,which could be seen as a good fertilizer.The sewage sludge compost’s characters were:the concentrations of available N,P,K and OM were 4.27 g∙kg-1,174.48 mg∙kg-1,182.50 mg∙kg-1 and 17.7% ,the pH value was 6.40,the electrical conductivity was 4.25 ms∙cm-1.
The conclusions were as follows:Along with the increase of application ratio of SSC,the soil’s structure became more loose,the porosity increased,and bulk density reduced,the proportion of physical clay in soil increased,the soil electrical conductivity increased.On the other hand,the concentrations of soil nutritious elements of OM,TN,TP,available N,available P and available K increased apparently with the increase of application dosage of SSC.SSC application could protect the soil from erosion and stimulate C and N cycling,thereby reducing pollution by runoff and leaching.
We concluded that the application of SSC improved the soil’s physical structure and fertility,improved the soil’s physical,chemical and biological characters,therefore, SSC had a good application prospect in the aspect of soil improvement,this practice is inexpensive and easy to carry out.
[10] Rukun Lu,Analysis Methods for Soils and Agricultural Chemistry.Beijing:China Agric.Sci.Technol.
Online since: March 2015
Authors: Yan Jun Zhang, Hai Yan Zhang, Yan Ju Chen, Mei Yu Zhang, Hong Li Wang, Dong Wei Cao, Min He
Key Laboratory of Road structure & Material Ministry of Communication, PRC, Beijing 100088, China
ahemin307@163.com, b815184658@qq.com, ccaodongwei@vip.126.com, d915404135@qq.com, e13811655369@163.com, fchenyanju@qq.com, g33474672@qq.com
Keywords: Aging, Bio-asphalt, Structure, Hot stage microscopy, IR, NMR.
This paper explains and demonstrates the aging performance and structure of bio-asphalt with analytical results from hot stage microscopy, infrared spectroscopic and nuclear magnetic resonance spectra.
This method has simple operation, almost no energy consumption in the earlier stage and low cost. 1.2 Analytical methods of the composition and structure of bio-asphalt (1)As for infrared spectroscopic analysis, smear method has been adopted, after heating and dehydration of bio-asphalt, to smear it on KBr pellet and determine the distribution of functional groups of it through characteristic peak after sweep analysis with Nicolet 5700 type infrared spectrometer
Progress in chemistry.2007,19(7/8):1064-1070.
Comparison of the different types of biological oil chemical composition structure[J].Journal of chemical fuel.2011,39(10):747-753.
This paper explains and demonstrates the aging performance and structure of bio-asphalt with analytical results from hot stage microscopy, infrared spectroscopic and nuclear magnetic resonance spectra.
This method has simple operation, almost no energy consumption in the earlier stage and low cost. 1.2 Analytical methods of the composition and structure of bio-asphalt (1)As for infrared spectroscopic analysis, smear method has been adopted, after heating and dehydration of bio-asphalt, to smear it on KBr pellet and determine the distribution of functional groups of it through characteristic peak after sweep analysis with Nicolet 5700 type infrared spectrometer
Progress in chemistry.2007,19(7/8):1064-1070.
Comparison of the different types of biological oil chemical composition structure[J].Journal of chemical fuel.2011,39(10):747-753.
Online since: October 2023
Authors: Mohamad Ramadan, Aghyad B. Al Tahhan, Ibrahim Al-Adwan, Mohammad Alkhedher
The structures are then characterized with single or multiple vacancy defects along the axis of the nanotube structure, which is modeled as wavy structures to replicate their natural structure.
Additionally, waviness was shown to induce defects along the structure of the CNT.
Furthermore, the vacancies are introduced randomly along the structure by removing a specific amount of carbon atoms from the pristine structure and then introducing an axial tensile load along the Z-axis of the structure.
Initially, we simulated a CNT structure with a single vacancy defect which is defined by [28] as the breaking of three short and strong C=C bonds in graphene structures.
Sahu, An overview on methods for the production of carbon nanotubes, Journal of Industrial and Engineering Chemistry. 20 (2014) 1186–1197. https://doi.org/10.1016/J.JIEC.2013.09.001
Additionally, waviness was shown to induce defects along the structure of the CNT.
Furthermore, the vacancies are introduced randomly along the structure by removing a specific amount of carbon atoms from the pristine structure and then introducing an axial tensile load along the Z-axis of the structure.
Initially, we simulated a CNT structure with a single vacancy defect which is defined by [28] as the breaking of three short and strong C=C bonds in graphene structures.
Sahu, An overview on methods for the production of carbon nanotubes, Journal of Industrial and Engineering Chemistry. 20 (2014) 1186–1197. https://doi.org/10.1016/J.JIEC.2013.09.001
Online since: March 2014
Authors: Pavol Šajgalík, Monika Kašiarová, Miroslav Hnatko, Zuzana Vilčeková, Magdaléna Domanická
Determination of Local Mechanical Properties of Si3N4 Based Foams
Zuzana Vilčeková1, a *, Monika Kašiarová1,b, Magdaléna Domanická2,c, Miroslav Hnatko2,d and Pavol Šajgalík2,e
1Institute of Materials Research, Slovak Academy of Sciences, Watsonova 47, Košice, Slovakia
2Institute of Inorganic Chemistry, Slovak Academy of Sciences, Dúbravská cesta 9, Bratislava, Slovakia
azvilcekova@imr.saske.sk, bmkasiarova@imr.saske.sk, cmagdalena.domanicka@savba.sk, duachmiho@savba.sk euachsajg@savba.sk
Keywords: mechanical properties, foams, silicon nitride, hardness, Young’s modulus
Abstract.
Silicon nitride foams were prepared using polyurethane foam replication method to obtain appropriate cellular structure suitable for bio-application.
The effects of the structures, temperature of calcination, volume fraction of Si3N4 powder and number of the infiltrations on the local mechanical properties were investigated.
Ceramic foams which are being used as biomaterials usually require an open-cell structure.
Silicon nitride foams were prepared using polyurethane foam replication method to obtain appropriate cellular structure suitable for bio-application.
The effects of the structures, temperature of calcination, volume fraction of Si3N4 powder and number of the infiltrations on the local mechanical properties were investigated.
Ceramic foams which are being used as biomaterials usually require an open-cell structure.
Online since: May 2013
Authors: Amir Al-Ahmed
Palmisano, Photocatalysis: a promising route for 21st century organic chemistry, Chem.
Industrial & Engineering Chemistry Research, 45 (8) (2006) 2558-2568
Progress in Solid State Chemistry, 32(1-2) (2004) 33-177
Altman, Surface structure of anatase TiO2(001): Reconstruction, atomic steps, and domains.
Coordination Chemistry Reviews, 186 (1999) 373-384
Industrial & Engineering Chemistry Research, 45 (8) (2006) 2558-2568
Progress in Solid State Chemistry, 32(1-2) (2004) 33-177
Altman, Surface structure of anatase TiO2(001): Reconstruction, atomic steps, and domains.
Coordination Chemistry Reviews, 186 (1999) 373-384
Online since: June 2007
Authors: Michihiro Sato, Tetsuya Ohashi, Takuya Maruizumi, Isao Kitagawa
The
periodic structure of the shallow trench isolation (STI) type ULSI cells are generally adopted as the
latest semiconductor device structure.
Dimensions of the model is typical for STI structure with the gate length 62 nm.
The structure consists of the volumes ① to ④, as shown in Fig. 1 (b).
Fig. 1 (a) Schematic illustration of the periodic structure of the STI type ULSI cells.
[4] Encyclopedia for Physics and Chemistry, 3 rd ed., edited by B.
Dimensions of the model is typical for STI structure with the gate length 62 nm.
The structure consists of the volumes ① to ④, as shown in Fig. 1 (b).
Fig. 1 (a) Schematic illustration of the periodic structure of the STI type ULSI cells.
[4] Encyclopedia for Physics and Chemistry, 3 rd ed., edited by B.
Online since: May 2021
Authors: Irina V. Zlobina
The structure of carbon fiber after removal of the load is completely destroyed (Fig. 4 a).
Cured PCM consist of two phases: an amorphous structure of a chaotic nature (the main volume of the matrix) and areas of an ordered structure, which some authors consider a crystalline phase [24].
In this case, the capillary effect of moisture penetration through cracks and pores in the structure of the matrix and the IFL is important, which leads to the wedging of the structure when moving along the capillary (Rebinder effect).
UHF wave processes stimulate oscillations of macromolecules in the reduced plasticized amorphous structure of the IFL and their conformational rotations, activation of the finished fiber surface, promote the movement of defects and their emergence from the structure to the surface.
Pyataev, Effect of vibration in Processes of structure Formation in Polymers, Russian Journal of Applied Chemistry. 87(3) (2014) 352-354
Cured PCM consist of two phases: an amorphous structure of a chaotic nature (the main volume of the matrix) and areas of an ordered structure, which some authors consider a crystalline phase [24].
In this case, the capillary effect of moisture penetration through cracks and pores in the structure of the matrix and the IFL is important, which leads to the wedging of the structure when moving along the capillary (Rebinder effect).
UHF wave processes stimulate oscillations of macromolecules in the reduced plasticized amorphous structure of the IFL and their conformational rotations, activation of the finished fiber surface, promote the movement of defects and their emergence from the structure to the surface.
Pyataev, Effect of vibration in Processes of structure Formation in Polymers, Russian Journal of Applied Chemistry. 87(3) (2014) 352-354