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Online since: September 2012
Authors: Malgorzata Plonska, Beata Wodecka-Dus, Wojciech A. Pisarski, Lukasz Cienki
Pisarski2,b, Beata Wodecka – Dus3,c and Lukasz Cienki4 1,3,4University of Silesia, Faculty of Computer and Materials Science, Department of Materials Science, Sosnowiec, Poland 2University of Silesia, Faculty of Mathematics, Physics and Chemistry, Institute of Chemistry, Katowice, Poland amalgorzata.plonska@us.edu.pl, bwojciech.pisarski@us.edu.pl, cbeata.wodecka-dus@us.edu.pl Keywords: PLZT:Nd3+, ferroelectric ceramics, luminescence spectra Abstract.
Goal of this study was to investigate how Nd3+ ions (0-1 wt.%) influence on prepared powders and samples of co-doped 8/65/35 PLZT ceramics, like its structure, microstructure, luminescent spectra and ferroelectric properties.
For the diffraction pattern fitting a structure model from ICDD data base was used (PDF standards, N° 00-029-0775; 00-029-0776; 00-046-0336).
One can see, neodymium co- doping (0,5-1 wt-%) does not change the symmetry the perovskite lattice structure of 8/65/35 PLZT.
Online since: June 2014
Authors: Ying Hui Chen, Shuai Wang, Wen Lian Liu
In addition to the mechanics environmental geotechnical engineering also involves physics, chemistry, biology, geology, and the social sciences, etc.
Solving environmental geotechnology problems, we must combine different subjects such as physics, chemistry, biology, soil science, etc. to learn methods from other disciplines.[7] 4 Environmental geotechnical engineering and other disciplines Environmental geotechnology has related disciplines: engineering geology, rock mechanics, rock and soil engineering, geological engineering, environmental engineering geology.
Engineering geology that determine the geological engineering geological genesis and evolution characteristics of study from the local geological features, exploration of geological bodies in the generation of geological environment and the evolution process of the geological process and geological formation, the overall understanding and grasp the composition and structure of the geological body, and to further explore and forecast in engineering structures under the action of behavior.
Geotechnical engineering is to geotechnical as part of the engineering structure engineering disciplines.
Online since: January 2014
Authors: Run Ping Han, Yi Ke Li, Yu Shang, Jing Hua Zhang
School of Chemistry and Molecular Engineering, Zhengzhou University, Kexue Road 100, Zhengzhou, 450001, PR China 2.
Department of Chemistry and Chemical Engineering, Huanghuai University, Wenhua Road 599, Zhumadian, 463000, PR China aemail: shangmagic2012@126.com, bemail: hollyli@126.com, cemail: 2860627869@qq.com, demail: rphan67@zzu.edu.cn Keywords: Pyrolytic char; Neutral red; Adsorption; Isotherm Abstract.
Dyes usually have a synthetic origin and complex aromatic molecular structures which make them more stable and more difficult to biodegrade.
X-ray diffraction (XRD) analysis was carried out to identify any crystallographic structure in the bio-char sample using a computer-controlled X-ray diffractometer.
From Fig. 1, the peaks at 2q= 20°–30° refer to the stacking structure of aromatic layers (graphite 002), and the broadening has originated from the small dimensions of crystallites perpendicular to aromatic layers.
Online since: March 2013
Authors: Mohamad Rusop, N.Y. Zayana
Figure 1 shows the molecular structure of MEH-PPV.
Fig. 1, Molecular structure of MEH-PPV.
Chui, Titania bicontinuous network structures for solar cell applications, Applied Physics Letters vol. 87 (2005) 023507-3
Yang, Fluorescence Quenching of Poly[2-methoxy-5–(2′-ethylhexoxy)-p-phenylene vinylene] (MEH-PPV) in Solutions, Chinese Journal of Chemistry 22 (2004) 80-84
Kim, Hybrid solar cells with ordered TiO2 nanostructures and MEH-PPV, Journal of Photochemistry and Photobiology A: Chemistry 188 (2007) 364-370
Online since: August 2017
Authors: Wen Jing Yang, Wu Lin Li, Mei Long, Gen Rong Li, Yan Ma, Xiao Zou, Yi Xu, Yan Fei Li
Fabrication of Macroporous Silicon in Organic Electrolytes and their Luminescence Wulin Li1,2, a *, Wenjing Yang1,b, Mei Long2,c, Genrong Li2,d, Yan Ma2,e, Xiao Zou2,f, Yi Xu1,g and Yanfei Li2,h 1College of Chemistry and Chemical Engineering, Chongqing University, China, 400030 2Chongqing Academy of Metrology and Quality Inspection, China, 401123 alwl656pll@163.com, byangwj308@163.com, c57162725@qq.com, d734253977@qq.com, e46550694@qq.com, fcutie621@163.com, g1658790350@qq.com, hlyf@cqjz.com.cn Keywords: Macroporous Silicon, Organic Electrolyte, Quasi-regular Arrays, Luminescence.
elements before NaOH treat after NaOH treat O K 37.49 8.93 Si K 62.51 91.07 Conclusions In summary, we have presented a useful technique of fabricating porous silicon which provides a quasi-regular self-assembled arrangement without pre-structuring.
Kilian, Patterned porous silicon photonic crystals with modular surface chemistry for spatial control of neural stem cell differentiation, Nanoscale. 8 (2016) 10891-10895
Ihara, Formation of the seed layers for layer-transfer process silicon solar cells by zone-heating recrystallization of porous silicon structures, Appl.
Wen, Structure and photoluminescence properties of the quasi-regular arrangements of porous silicon, optoelectron. adv. mat. 5 (2011) 495-498
Online since: July 2011
Authors: Yan Ping Fan, Bao Qing Zhang, Zhi Zhang, Bao Zhong Liu
Hydrogen storage property of Ti45Zr35Ni17Cu3 quasicrystal powder Baozhong LIU1,a, Yanping FAN2,b, Baoqing ZHANG1,c and Zhi ZHANG1,d 1 School of Materials Science and Engineering, Henan Polytechnic University, 2001 Shiji Road, Jiaozuo 454000, China 2 School of Physics and chemistry, Henan Polytechnic University, 2001 Shiji Road, Jiaozuo 454000, China aemail bzliu@hpu.edu.cn, bemail fanyanping@hpu.edu.cn, cemail bqzhang@hpu.edu.cn demail zhizhang@hpu.edu.cn Keywords: Ti-Zr-Ni-Cu alloy; icosahedral quasicrystal; hydrogen storage; electrode materials Abstract.
Introduction Since icosahedral phase (I-phase) as a new type of crystal structure was found, lots of attentions have been paid to investigate their unusual and interesting chemical and physical properties [1-3], such as, high hardness, low surface friction, special transport property, high hydrogen storage ability, which are originated from the particularity to crystal in a forbidden rotational symmetry structure.
It was believed that the local structure of Ti-based I-phase was related to the Bergman two-shell atomic cluster, and Bergman cluster contains a lot of favorable sites for hydrogen atom, implying I-phase has better physical characteristics for hydrogen storage application.
Such as, thermodynamical stability, suitable chemistry affinity and low cost [5].
Online since: August 2018
Authors: Xiao Bo Bai, Fang Wang, Ai Xia Chen, Rui Hua Wang, Deng Liang Yi, Jie Guang Song, Xiao Dong Jiang, Lin Chen
Effect of Molding Processing on Properties of Al2O3-Al Cermet Prepared via Powder Metallurgy Method Ruihua Wang1, Xiaobo Bai1, Xiaodong Jiang1, Dengliang Yi1, Fang Wang1, Aixia Chen1a, Jieguang Song2b, Lin Chen3 1School of Mechanical and Materials Engineering, Jiujiang University, Jiujiang 332005, China 2Engineering & Technology Research Center for Environmental Protection Materials and Equipment of Jiangxi Province, School of Materials and Chemistry Engineering, Pingxiang University, Pingxiang 337055 China 3Key Laboratory for Industrial Ceramics of Jiangxi Province, School of Materials and Chemistry Engineering, Pingxiang University, Pingxiang 337055 China a93618054@qq.com, bsongjieguang@163.com Keywords: Metallic ceramic materials; powder metallurgy method; alumina; molding process.
A composite material with a special coated structure can be formed and the interface between the aluminum and alumina can be effectively improve by combining aluminum and alumina.
An effective package structure having Al2O3-Al composite powders is prepared by adjusting the calcining process.
The melting point of Al is 660 °C, the melting point of Al2O3 is 2050 °C, the sintering temperature of sample is 700 °C, Al powder is completely melted, Al2O3 powder is not, the combination type is mechanical bonding, the microstructure shows non-sintering densification and loose structure, Al is a dense phase with respect to Al2O3, and Al2O3 is a non-dense phase [10-11].
Online since: July 2015
Authors: Atchana Wongchaisuwat, Siriporn Meeying, Pinsuda Viravathana, Siree Tangbunsuk
Synthesis and characterization of PdCoNi nanocomposites supported on graphene as anodic electrocatalysts for methanol oxidation in direct methanol fuel cell Siriporn Meeying 1,a, Pinsuda Viravathana1,b, Atchana Wongchaisuwat1,c, Siree Tangbunsuk 1,d* 1Department of Chemistry, Faculty of Science, Kasetsart University, Bangkok, 10900, Thailand aplaum_0231@hotmail.com, bfscipdv@ku.ac.th, cfsciatw@ku.ac.th, d*fscisrta@ku.ac.th Keywords : Electrocatalysts, Graphene, Methanol oxidation, PdCoNi/G nanocomposite, Direct methanol fuel cell Abstract PdCoNi nanocomposites supported on graphene (PdCoNi/G) have been obtained from chemical reduction of metal catalysts and graphite oxide (GO) with a strong reducing agent, followed by calcination at high temperature under N2 condition, and used for electrooxidation of methanol in direct methanol fuel cell.
Most efforts are put on designing a new catalytic structure as Pd-based catalysts which are good catalysts for low temperature.
Structure characterization and the chemical surface analysis of the synthesized catalysts Figure 2 The XRD pattern (A) and XPS spectra of Pd 3d (B), Co 2p (C), and Ni 2p (D) region of Pd/G, PdCoNi/G, PdCoNi/G calcined at 300°C, 400°C, and 500°C In figure 2 (A), the diffraction peaks at 40.2°, 44.1°, 68.8°, and 82.8° were corresponding to the characteristic peaks (111), (200), (220), and (311) of fcc Pd, respectively (PDF no.03-065-2867).
These results suggested that the addition of Co and Ni did not change the crystalline structure of Pd and the crystalline phase of Co and Ni were not present in the catalysts.
Acknowledgment Authors would like to thank Kasetsart University Research and Development Institute (KURDI), Preproposal Research Fund (PRF), Department of Chemistry, Faculty of Science, Kasetsart University and The Graduate School, Kasetsart University for financial support and Synchrotron Light Research Institute (SLRI) for XPS measurements.
Online since: April 2018
Authors: Marzhan Sultangazina, Korlan Khamitova, Daniar V. Ismailov, Maratbek Gabdullin, Zhanibek Ayaganov, Rakhima Kanat
While the liquid phase may have different chemical compositions, which significantly affect the structure and composition of the resulting nanoobjects.
The acting mechanism of additives, after it introduction into a liquid medium such as "industrial oil", radically differs from surface friction modifiers and consists in the structuring of molecules of the environment around objects with high surface energy.
Just as, for example, the Sun "structures" the Solar System around itself: Therefore, in contrast to the "primitive" friction modifiers of the "antifriction powder" type, the required concentration of additives obtained using proposed synthesis method is much lower, which positively affects many aspects.
References [1] Schur D.V., Dubovoy A.G., Lysenko E.A., GolovchenkoТ.N., ZaginaichenkoS.Yu., Savenko A.F., Adeev V.M., Kaverina S.N., Synthesis of nanotubes in the liquid phase, Proceedings of VIII International Conference “Hydrogen Material Science and Chemistry of Metal Hydrides”, Ukraine, 2003
[4] Keypour et al., An improved method for the purification of fullerene from fullerene soot with activated carbon, celite, and silica gel stationary phases, Journal Of Nanostructure in Chemistry. 3 (2013) 45-48
Online since: September 2014
Authors: Ri Yao Chen, Yan Yu Hu, Li Jin Chen, Ya Ping Yu
As functional materials, phthalocyanines, with distinctive structure and excellent light, heat and chemical stability, display wide perspective in new and high-tech areas such as catalytic chemistry, photochemistry, electrochemistry, information and material science and medical science[14,15].
It was because that the -COO− groups of Fe-phthalocyanine were combined with the -COO− groups of CMC by means of Fe3+ to form a metal chelate polymer with a net structure.
After modification, the -COO− groups of Fe-phthalocyanine were combined with the -COO− groups of CMC by means of Fe3+ to form a metal chelate polymer with a net structure, which made a significant contribution to improving mechanical property.
Bailar, Inorganic Chemistry. 11(1972), 1578-1583