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Online since: May 2004
Authors: Yoshio Sakka, Tohru Suzuki
The specimen prepared without a magnetic field was confirmed to have a randomly oriented polycrystalline structure.Figures 2 and 3 illustrate the XRD profiles of the SiC (w)-dispersed Al2O3 composite which was compacted by slip casting in a strong magnetic field of 10 T, followed by sintering at 2073 K for 2 h in an Ar atmosphere.
β-SiC with a cubic crystalline structure exhibits a crystalline isotropic magnetic susceptibility, however, whiskers show the shape magnetic anisotropy which is another possible alignment mechanism [11].
Sakka: Chemistry Letters (2002), p. 1204 [9] E.
Online since: May 2003
Authors: Helga Füredi-Milhofer, N. Garti, P. Bar-Yosef, R. Govrin-Lippman
Garti 1 1 Casali Institute of Applied Chemistry and 2Faculty of Life Sciences, The Hebrew University of Jerusalem, Jerusalem 91904, Israel E-mails: # Helga@vms.huji.ac.il and *Pazitb@pob.huji.ac.il Keywords: precipitation, phase transformation, aggregation, amorphous calcium phosphate, octacalcium phosphate, poly-l-lysine, poly-l-glutamic acid, polystyrene sulfonate.
In the control system ACP appeared in the form of chain-like aggregates of spherulitic structures with diameters 100 - 200 nm, (Fig.2a) which, within 24h, transformed into well formed plate-like crystals (Fig.2 c).
Clearly the magnitude of the effect depends on the charge, molecular structure and concentration of the respective polyelectrolyte.
Online since: November 2006
Authors: Guo Lu Li, Jin Hai Liu, Xue Bo Zhao, Gen Sheng Liu, Xiao Yan Hao
Introduction The measurement of fatigue damage of materials and the life evaluation of a structure are a complex key subject in the field of mechanical engineering.
As we know, at the early cycle stage, the metallurgical structure of materials is at unstable state.
References [1] Shi Mingzhe, Guo Gaozhao and Huang Zhiqang:J.of Zhejiang University, Vol.28(1994),P. 660 [2] Jean Lemaitre: Nuclear Engineering and Design, Vol.80(1984), P.233 [3] Gou Wenxuan, Lu Zhixian and Wang Anqiang: Chinese journal of applied mechanics, Vol.15(1998), P.79 [4] Du-Yi Ye, De-Jun Wang and Ping An: Materials Chemistry and Physics, Vol.44 (1996), P.179 [5] Taku ADACHI, Jun KOMOTORI, Masao SHIMIZU:Transactions of Japan Mechanical Association(A), Vol.59(1993),P. 291 [6] Liu Jinhai, Zeng Daben and Wang Xuan: J. of Tsinghua University, Vol.39(1999),P.14 [7] J.H.
Online since: December 2014
Authors: Shu Qin Wang, Yin Tao Wang, Zhi Ping Han
Experimental Methods The structure of the doped TiO2 was investigated using X-ray diffraction (XRD) (Y2000, Dandong, China).
When the polycondensation rate is slow enough, it has enough time to complete a stable generating rutile structure [7].
NV-TiO2 with pH3.5 and microwave 23min Fig. 1 The XRD spectra of different TiO2 Table 4 The particle size and anatase content of different TiO2 Samples Calcination temperature (°C) Particle size(nm) Anatase  content(%) V-TiO2 drying 420min 700 61.1 30.2 V-TiO2 microwave 23min 700 30.9 22.5 V-TiO2 pH3.5 microwave 23min 700 32.2 13.0 NV-TiO2 microwave 23min 500 21.4 83.8 NV-TiO2 pH3.5 microwave 23min 500 21.1 67.3 Analysis of XPS spectrum In order to analyze the chemistry composition of NV -doped TiO2 prepared, the sample was characterized by photoelectron spectroscopy which is shown in Fig. 2.
Online since: May 2016
Authors: Edwige Bano, Konstantinos Zekentes, Anne Henry, Ji Hoon Choi, Giovanni Attolini
Comparison of bottom-up and top-down 3C-SiC NWFETs Jihoon Choi1,2a, Edwige Bano1b, Anne Henry3c, Giovanni Attolini4d and Konstantinos Zekentes5e 1 IMEP-LAHC/Grenoble INP, MINATEC, 3, parvis Louis Neel-BP 257, 38016 Grenoble, France 2LTM, CEA/LETI/D2NT, 17, Av. des Martyrs, 38054 Grenoble Cedex, France 3Dept. of Physics, Chemistry and Biology, Linköping University, SE-581 83 Linköping, Sweden 4IMEM-CNR Parco Area delle Scienze 37/A, 43124 Parma, Italy 5IESL/ FORTH, Vassilika Vouton, PO Box 1385 Heraklion, Greece a nan10004ok@gmail.com, bbano@minatec.inpg.fr, canhen@ifm.liu.se, dgiovanni@area.bo.cnr.it, etrifili@physics.uoc.gr Keywords: nanowires, 3C-SiC, NWFET.
SEM images of (a) as-grown SiC NWs by bottom-up method, (b) 3C-SiC surface morphology after a deep etching to form 1D structures, Top-down NWs were formed by Inductively Coupled Plasma (ICP) etching of a heteroepitaxial 3C-SiC films (~8.5 μm of thickness and 5•1016 cm-3 of n-type doping) grown on Si (100) substrates.
The device capacitance can be estimated by considering the whole structure as a capacitor having a cylinder, the NW, as one plate and the highly-doped substrate as the other plate [[] O.
Online since: January 2005
Authors: Prachi P. Katre, Anjali A. Athawale
Katre Department of Chemistry, University of Pune, Pune, Maharashtra, India.
Fine metal structures constitute a wide class of catalysts and sensors due to their extremely large surface area.
The FTIR spectral data of exposed samples when compared with that of the unexposed one, revealed notable changes in the quinoid and benzenoid band positions.The band corresponding to the benzenoid structure (~1486 cm-1) is found to shift towards lower energy with increased intensity and sharpness in ammonia environment.
Online since: February 2014
Authors: Tim H. Richardson, Syed Abdul Malik, Noor Azyyati Azahari, Faridah Lisa Supian
Since calixarenes molecules show remarkable features in the field of host-guest chemistry, it is interesting to study their behavior of monolayer at the air/water interface for possible application in ion sensor.
The chemical structure of Calix4 is shown in Fig. 1.
Our future work is aimed at investigating the sensor characteristics of LB film and its layer structure.
Online since: October 2014
Authors: Nobuaki Sato, Akira Krishima, Takayuki Sasaki
They take fcc and tetragonal structures expressed as ZryU1-yO2+x and t-UzZr1-zO2, respectively.
Since the b-U3O7 (U3O8-z) takes tetragonal structure isosturucturalwith t-ZrO2, decomposition of U3O8 to U3O8-z seemed to occur resulting in the formation of tetragonal solid solution at this temperature.
Fuger eds, “The Chemistry of The Actinide and Transactinide Elements”, 3rd Ed., Vol. 1, Chap. 5, 2006, Springer, pp339-398.
Online since: October 2014
Authors: Wei Lin Xu, Qian Wei Zhao, Yun Li Wang, Xiong Wei Xia, Dan Sheng
Study on Bleaching Properties of Dark Chicken Feather Yunli Wang1, a, Dan Sheng2, Xiongwei Xia1, Qianwei Zhao1, Weilin Xu2, b 1College of Chemistry and Chemical Engineering, Wuhan Textile University, Wuhan 430073, P.
The chicken feather belongs to the protein down fiber, and its structure is very similar to the natural animal hair, so it can be bleached according to other related dark animal hair bleaching process [7].
Due to the unordered feather structure, it difficult to measure the accurate value using instruments.
Online since: July 2015
Authors: Eva Vejmelková, Dana Koňáková, Jaroslava Koťátková
Influence of Cracks on the Properties of Self-Compacting Concrete KOŇÁKOVÁ Dana1,a *, KOŤÁTKOVÁ Jaroslava2,b and VEJMELKOVÁ Eva1,c 1Czech Technical University in Prague, Faculty of Civil Engineering, Department of Materials Engineering and Chemistry, Thákurova 7, 166 29 Prague 6, Czech Republic 2Czech Technical University in Prague, Faculty of Civil Engineering, Experimental Centre, Thákurova 7, 166 29 Prague 6, Czech Republic adana.konakova@fsv.cvut.cz, bjaroslava.kotatkova@fsv.cvut.cz, ceva.vejmelkova@fsv.cvut.cz Keywords: Self-compacting concrete, limestone powder, fly ash, thermal loading.
Higher values of water vapour diffusion resistance were found to be for samples with limestone powder which proves its better influence on the inner structure of concrete.
Conclusions Performed experiments described in this paper proved great influence of the presence of cracks in the structure of material on its mechanical and also water transport parameters.