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Online since: June 2012
Authors: Hou Bin Li, Wen Juan Gu, Bang Gui He
The molecular structure was characterized by FTIR.
The molecular structure of the filler was characterized on a Nicolet AVATAR 360FT Spectrometer, with the scanning range between 4000~400cm-1.
Results and Discussion FTIR The chemical structure was characterized by Fourier transform infrared (FTIR) and shown in Fig. 1.
The absorption at 1090 cm-1 belonged to the vibrations of Si-O bond in filler structure.
Lauterbur: Industrial and Engineering Chemistry, Vol. 47 (1955) p. 486
Online since: November 2011
Authors: Shi Long Yan, Wen Yao Huang, Hong Bo Wu
Relationship Research between Crystallization Quantity of Emulsion Explosive and Desensitization Degree under Dynamic Pressure Wenyao Huang1,a, Hongbo Wu 1,b, Shilong Yan 1,c, 1School of chemical engineering, Anhui University of Science and Technology Huainan Anhui 232001,China awyhuang@aust.edu.cn,bhbwu@aust.edu.cn, cslyan@aust.edu.cn Keywords: Applied chemistry, Emulsion explosives, Crystallization quantity, Dynamic pressure, Desensitization Abstract: Explosive emulsion was applied dynamic pressure using by underwater explosion test apparatus,and its pressure desensitization degree was calculated.
The fragmentation of GMB is less than expanded perlite under the same dynamic pressure, Fig. 2 Curves of crystallization quantity of emulsion explosive the destructiveness of fragment is smaller relatively to the structure of water in oil, so the demulsification degree of emulsion explosive sensitized by GMB is less than that of expanded perlite under the same dynamic pressure and the crystallization quantity is also smaller relatively.
Online since: June 2015
Authors: Renugambaal Nadarajan, Wan Azelee Wan Abu Bakar, Rusmidah Ali
Effect Of Calcination Temperature On Metal Oxides And Their Photocatalytic Activity Renugambaal Nadarajan1,a, Wan Azelee Wan Abu Bakar1,b*, Rusmidah Ali1,c 1Department of Chemistry, Faculty of Science, Universiti Teknologi Malaysia, 81310 UTM Johor Bahru, Johor, Malaysia.
The phase structure and surface area of the obtained samples calcined at different temperatures were studied.
The phase structures of the diffractograms were matched to the JCPDS data.
To study the effect of crystal structure on the photodegradation of DCB, samples calcined at different temperatures were used.
Acknowledgement The authors thank the Department of Chemistry, Faculty of Science, Universiti Teknlogi Malaysia for the financial support under GUP Grant 04H97 and the Ministry of Higher Education (MOHE).
Online since: October 2011
Authors: Chang Mao Hung
At current, copper and cerium metals with fluorite-type crystal structure have been used to elucidate the reduction characteristics of methane conversion in solid-oxide fuel cells (SOFCs) electrodes [4], CO oxidation process in hydrogen-rich streams (CO-PROX) [5], and also been shown to exhibit excellent performance of electrochemistry applications [6].
Rather, in this case, studies on cytotoxicity are available, especially for copper-group materials that have been used for decades, but very little is known on the toxicological effect and interaction with cellular structures for most newly developed materials.
Figure 2 presents the surface morphological changes of the Cu-La-Ce nanocomplexes catalyst, elucidated by TEM, which provides important information about the surface structure for Cu-La-Ce nanocomplexes with various metal contents catalyst.
Laborde, “Synthesis of Copper-Promoted CeO2 Catalysts,” Chemistry of Materials, vol. 18, March 2006, pp. 1945-1950, doi: 10.1021/cm052437h
Rolison, “Sol−Gel-Derived Ceria Nanoarchitectures: Synthesis, Characterization, and Electrical Properties,” Chemistry of Materials, vol. 18, Dec. 2006, pp. 50-58, DOI: 10.1021/cm051385t
Online since: January 2005
Authors: Eun Young Shin, Jiye Fang, Vladimir Golub, Cuiying Wang, Moon Jin Jun, Charles J. O'Connor
O'Connor1 , Vladimir Golub 1 , Cuiying Wang 1 , Moo-Jin Jun 3 1 Advanced Materials Research Institute, University of New Orleans New Orleans, LA70148, USA 2 Nano-Material Research Center, Korea Institute of Science and Technology P.O box131, Cheongryang, Seoul 130-650, Korea 3 Department of chemistry, Yonsei University, Seoul, Korea Keywords: Thermal-decomposition, Polymer-stabilized Co Nanocrystals, Seed-mediated methods.
The XRD trace reveals that the Co sample with PVP exists in the hcp structure, [ICDD PDF cards (5-0727)] as a major phase (minor contribution of epsilon phase); whereas, the sample without PVP exists in the fcc-structure as a single phase.
The magnetic properties of both cubic and hexagonal-structured cobalt nanocrystals were determined using SQUID.
Solid State Chemistry.
Online since: October 2021
Authors: Karel Dvořák, Simona Ravaszová
To be able to characterize and possibly influence the variability of the mineralogical composition of clinker, it is necessary to study the effects of individual polymorphs of clinker minerals on the properties, especially from a chemical point of view and their structure [1-3].
Acknowledgements We acknowledge the financial support to project “Study of laboratory preparation, structure and stability of tricalcium silicate” (FAST-J-20-6257) and project “Effects of mechano-chemical activation on the process of formation, structure and stability of selected clinker minerals” (20-00676S).
TAYLOR, Cement chemistry 2nd ed., T.
HEWLETT, Lea´s Chemistry of Cement and Concrete., Elsevier, 2004
Online since: November 2015
Authors: Gang Xie, Yan Cui, Yan Qing Hou, Lin Tian, Zhan Liang Yu, Ya Dong Li
Therefore, it is quite important to carry out the research on the structure of the oxidation reactor, gas mixing characteristics, TiCl4 gas phase oxidation with nucleation and crystallization and the growth mechanism.
Yang [8] believes that the flow field and concentration field are decided by the structure and the gas inlet condition, and reasonable structure and gas inlet conditions can make the reaction carried out in the center of the reactor, which will reduce the scarring in the reactor.
Two-dimensional direct numerical simulation of nanoparticle precursor evolution in turbulent flames using detailed chemistry.
Large-eddy-simulation-based multiscale modeling of TiO2 nanoparticle synthesis in aturbulent flame reactor using detailed nucleation chemistry.
Online since: August 2008
Authors: Boonchoat Paosawatyanyong, Worawan Bhanthumnavin, Phensupa Kamphiranon
Paosawatyanyong3 1 Organic Synthesis Research Unit, Department of Chemistry, 2 Program of Petrochemistry and Polymer Science, 3 Department of Physics Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand a worawan.b@chula.ac.th Keywords: microwave plasma polymerization, polythiophene Abstract.
Advantages of plasma polymerized polymer films have been characterized as high quality with a high degree of crosslinking and branching.[1,2] Chemical structure of the deposited polymer can be different from conventional polymers and are dependent on the polymerization parameters.
Nevertheless, the microwave power should be optimized since at very high power fragmentation of polymeric structure may take place (vide infra).
This is indicative of a decrease in sulfur content from the main structure.
Astle: CRC Handbook of Chemistry and Physics, 63rd ed.
Online since: June 2014
Authors: Ling Ling Dong, Xin Jia
Study of surface-enhanced Raman spectroscopy of crystal violet in acid aqueous Xin Jia1, a *, Lingling Dong2, b 1Department of Mathematics and Physics, Shanghai Dianji University, 201306, China 2Department of Chemistry, Fudan University, 200433, China a jiaxin@sdju.edu.cn, b dongling@fudan.edu.cn Keywords: surface-enhanced Raman scattering; crystal violet; silver colloid; acid effect Abstract: We reported the spectra intensity of surface enhanced Raman scattering (SERS) for crystal violet with changing the acid concentration.
Therefore, the spectroscopy has been widely used in some scientific and technical fields, such as chemistry, biology, surface science, qualitative and quantitative analysis [1-10].
CV molecules have the characteristics of typical symmetric structure, belonging to three aryl dye and three dimethyl aniline groups link in the center of carbon atoms.
CV could be used as Raman markers and the structure information of molecules marked by CV molecules could be detected via Raman microscopy.
The SERS spectra bands corresponding to the information of the molecular structures are shown in Table 1 [14].
Online since: May 2013
Authors: Lian Liu, Pei Wang, Guang Shuo Wang, Teng Yu, Zhi Yong Wei
Good method can effectively regulate the structure, spatial distribution of the nanoparticles and the volume fraction, thus we could get the great performance of nanocomposites. 2.1 Blending method Solution mixing and melt blending primarily use the mechanical stirring and ultrasonic dispersion to achieve the nanocomposites of nanofillers with PCL.
After PCL was coated onto MWNTs surfaces, core/shell structures with nanotubes as the “hard” core and the hairy polymer layer as the “soft” shell are formed.
The PCL/C60 nanocomposites possess well-defined structure and high degree of functionality of C60.
Industrial & Engineering Chemistry Research, Vol.50, 13885-13891.(2011) [9] Rijing Wang, Xiaohong Wang, Shijie Chen.
Macromolecular Chemistry and Physics, Vol.209, 104-111.(2008) [14] Wen-Bin Zhang, Jinlin He, Xuehui Dong.