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Online since: March 2015
Authors: Hai Xia Chen
Figure.1 Quartz crystal microbalance (QCM) structure The classic method of first obtaining the total equivalent impedance, and then by the total equivalent impedance through a mathematical transformation to obtain equivalent resistance, the equivalent capacitance and the equivalent inductance of the expression, in order to get the final application of the frequency response of a resonance relationship expression .
Figure 4 shows a cross-sectional view is placed QCM viscous liquid, containing an air layer, four-layer structure quartz layer, and the fluid layer of quality layers.
When the thickness of the mass layer is much smaller than the wavelength of the acoustic wave propagating therein, the layer quality can be considered concentrated in the infinitely thin quartz, the fluid at the interface, so the four-layer structure can be reduced to three.
Conclusion Analytical chemistry as well as the vast majority of biomedical experiments were carried out in the liquid phase environment.
Online since: March 2016
Authors: Mohamed Kamari Halimah, S.O. Baki, W.M. Daud, M.N. Azlan
The spectra contains of several peaks indicating their local structure.
The existence of trivalent electrons of neodymium ions affects the structure of the glass system by increasing number of free electrons which leads to decreasing number of band gap energy [8].
Journal of non-crystalline solids. 14-21. (2013) [2] Chimalawong P., Kaewjhao J., Kedkaew C., Limsuwan P.(2010) “Optical and electronic polarization of Nd3+ doped soda-lime silicate glasses”Journal of Physcics and Chemistry of Solids.975-970 [3] M.
Ghoshal, “Effect of AgCl on spectroscopic properties of erbium doped zinc tellurite glass,” Journal of Molecular Structure.
Online since: June 2015
Authors: Suédina Maria L. Silva, D.L.A.C.S. Andrade, E.L. Canedo, C.M.O. Raposo, Kaline Rosário Morais Ferreira
This is because, due to their composition and structure, these clays have specific properties that make them useful in diverse applications such as cosmetics, drilling fluids and polymer nanocomposites.
The natural clay was organically modified with two different surfactants and different organophyllization routes (codes MH and MT in the Laboratory of Physical Chemistry, Department of Mining and Geology, UFCG.
No effect of the type of clay on peak position or structure was observed.
The results suggest that intercalated, disordered clay structures, and some degree of exfoliation [11], in particular for more diluted composites.
Online since: April 2022
Authors: Petr Urban, Juan Manuel Montes Martos, Fátima Ternero Fernández, Raquel Astacio Lopez, Rosa María Aranda Louvier
Nickel Porous Compacts Obtained by Electrical Discharge Consolidation Fátima Ternero Fernández1,a*, Petr Urban1,b, Raquel Astacio López1,c Rosa María Aranda Louvier2,a and Juan Manuel Montes Martos1,d 1Advanced Materials Engineering Group, Escuela Técnica Superior de Ingeniería, Universidad de Sevilla, 41092 Sevilla, Spain 2Department of Chemical Engineering, Physical Chemistry and Materials Science, Escuela Técnica Superior de Ingeniería, Universidad de Huelva, 21071 Huelva, Spain afternero@us.es, bpurban@us.es, crastacio@us.es, drosamaria.aranda@dqcm.uhu.es, ejmontes@us.es Keywords: Nickel, Electrical discharge consolidation, Capacitors bank, Porosity Abstract.
This fast process allows to preserve the inherent structure of the material and to obtain high-porosity compacts.
Nickel powder Ni Type 255 has a structure formed by fine three-dimensional filaments, similar to a necklace.
This structure can be seen in the high-resolution SEM images shown in Fig. 2.
Online since: March 2013
Authors: K. Giribabu, A. Stephen, L. Vijayalakshmi, V. Narayanan, Suresh Ranganathan
Narayanan1e* 1Department of Inorganic Chemistry, University of Madras, Guindy Campus, Chennai 600025 Tamil Nadu, India 2CSI Ewart Women’s Christian College, Melrosapuram, Kancheepuram 603204 Tamil Nadu, India 3Department of Nuclear Physics, University of Madras, Guindy Campus, Chennai 600025 Tamil Nadu, India asureshinorg@gmail.com, bvigneshgiribabu@gmail.com, clvniji53@yahoo.in, dstephen_arum@hatmail.com, e*vnnara@yahoo.co.in Keywords: Uric acid, nanoparticles, iron oxide, V2O5 Abstract The Fe2O3 and V2O5 nanoparticles were prepared by thermal decomposition method.
The phase and structure of the sample was analyzed by a Rich Siefert 3000 diffractometer with Cu-Kα1 radiation (λ = 1.5418 Å).
Result and discussion 3.1 Structure and morphology The XRD pattern of Fe2O3 (Fig. 1a) shows the diffraction peaks which are in agreement with the theoretical data of hematite [2].
The XRD confirms the structure of the samples.
Online since: May 2012
Authors: Hua Ye, Li Na He, Yan Jiang
Study and Fabrication of Acid-modified Diatomite Yan Jiang1, a, Hua Ye 1, b, Lina He 1, c 1College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China ajiangyan144@126.com, byehua308@163.com, chelina1986@126.com Keywords: Diatomite; Acid-modified; Specific surface area; Adsorption Abstract: This paper presents an investigation of the purification and activation of a raw diatomite by acid treatment.
The structure of diatomite is complex and contains numerous fine microscopic pores, cavities and channels, and therefore the material has a large specific surface area, high absorption capacity and low density.
The powder of SiO2 gel produced by the sulfuric acid treatment on Na2SiO3 is incorporated into diatomite structure, the powders not only deposits into pores of diatomite but also aggregates on the surface of diatomite.
However, the main pore structure of diatomite is marcopores( pore widths greater than 50nm ) [5].
Online since: August 2008
Authors: Tawee Tunkasiri, Gobwute Rujijanagul, K. Sathitada, P. Thavornyuttakarn, Uraiwan Intatha, Kamonpan Pengpat, Sukum Eitssayeam
Tunkasirib a School of Science, Mae Fah Luang University, Chiang Rai 57000, Thailand b Department of Physics, Faculty of Science, Chiang Mai University, Chiang Mai 50202, Thailand c Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai 50202, Thailand a *i_uraiwan@yahoo.com Keywords: Sintering add, Barium iron niobate, Dielectric properties Abstract.
This low melting point additive may diffuse into a grain boundary, allowing BFN grains to grow rapidly in cubic shape, corresponding to their crystal structure.
The XRD phase analysis was based on the Inorganic Crystal Structure Database (ICSD) code. 43622.
Thus, K + ion in this system might be segregate at grain boundary and the conductivity mechanism may probably like core-shell structure.
Online since: February 2007
Authors: He Bin Shi, Hong Zhong, Yu Liu, Ming Chuan Liang, Ming Chen, Feng Zhao Zhang
Preparation of Silicate Substituted Calcium Deficient Hydroxyapatite by Coprecipitation He-Bin Shi 1,2,a , Hong Zhong2,b , Yu Liu1*,c , Feng- Zhao Zhang1,d , Ming-Chuan Liang 1,e and Ming Chen1 1 School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan 430073, China; 2 College of Chemistry and Chemical Engineering, Central South University, Changsha 410081, China; a hbshi1010@163.com, b zhonghong@mail.csu.edu.cn, * c corresponding author, liuyu@mail.wit.edu.cn; d fengzhao0555@sohu.com; e gujinyan1111@sina.com Keywords: silicate, calcium deficient hydroxyapatite, coprecipitation Abstract.
Introduction Many recent studies revealed that the bioactivity of hydroxyapatite was significantly enhanced by incorporate silicon into its structure [1-4].
At this research, the structure of SiCDHA was not delicately revealed.
Two simple structures of SiCDHA similar to SiHA were suggested as Ca10-x(SiO4)y(HPO4)x-y(PO4) 6-x(OH)2-x-2y and Ca10-x(SiO4)y(HPO4)x (PO4) 6-x-y (OH)2-x-y.
Online since: February 2007
Authors: Lennart Bergström, Yuji Hotta, Koji Watari, Kimiyasu Sato, Yu Jia
Multilayer ZrO2 Precursor Coated Polystyrene Particles Yu Jia 1, Yuji Hotta 1, Kimiyasu Sato 1, Koji Watari1 and Lennart Bergström 2 1 National Institute of Advanced Industrial Science and Technology (AIST), Japan 2 YKI, Institute for surface chemistry, Sweden Keywords: Nano-particles, Coating, ZrO2, Precursor, Templating Abstract.
In fact, numerous properties of macroporous materials, such as density, thermal conductivity, and dielectric permittivity, are mainly dependent on their pore morphology (e.g. pore size, wall thickness, and structure) [1].
Closed pores can be achieved by emulsion templating method, but only when the volume fraction of the inner phase is lower than 30%, which leads to a decrease in total porosity [2], whereas colloidal crystal templating method with a well-ordered structure of silica or polystyrene (PS) microsphere is difficult for controlling the porous wall thickness [3-4].
On the other hand, by colloidal templating method that using pre-coated templates, ordered porous structures with a controlled pore size can be developed and the porous wall thickness could be controlled by using templates with different coating thickness [1, 5-6].
Online since: January 2005
Authors: Cheng Zhou, Zhen Ji, Zhigang Xiao, Sen Wang, You Song Gu, Yue Zhang
A Study on Nanometer-sized BaTiO3-based Dielectric for Ni-MLCC with Y5V Specification Zhen Ji 1, a , Zhigang Xiao, Sen Wang , Yousong Gu, Cheng Zhou,Yue Zhang b 1 Department of Material Physics and Chemistry, University of Science and Technology Beijing, Beijing 100083, China a jizhen@mater.ustb.edu.cn, byuezhang@pgschl.ustb.edu.cn Keywords: Nano-BaTiO3-based, Non-reducible, Ni-MLCC Abstract.
Results and Discussion Phase structure analysis of calcined non-reducible BaTiO3-based powders.
According to XRD results the perovskite structure started to generate at 800°C, it is about 200°C lower than the mechanically milled powders.
-60 -40 -20 0 20 40 60 80 100 120 140 0 1000 2000 3000 4000 5000 6000 7000 8000 9000 dielectric constant dissipation factor dielectric constant374# 0.000 0.005 0.010 0.015 0.020 0.025 0.030 0.035 0.040 0.045 temperature/ oC temperature/ oC dissipation factor -60 -40 -20 0 20 40 60 80 100 120 140 0 20 40 60 80 TCC ( E25OC-ET) / E25 OC /% tem perature/ oC 374# Fig.4 Dielectric constant and dielectric Fig.5 TCC versus temperature at 1kHz loss versus temperature at 1kHz Conclusions Non-reducible BaTiO3-based dielectric ceramics were obtained from powders with perovskite structure, which are about 50nm in particle size and are synthesized with chemical method.