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Online since: March 2010
Authors: Matthew P. Espe, Saida Y. Ortiz-Colon, Arturo Ponce, Ronald F. Ziolo
Ziolo 2,d 1 Knight Chemical Laboratories, Department of Chemistry, University of Akron, Akron, OH USA 44325-3601 2 Centro de Investigación de Química Aplicada, Saltillo, Coahuila, México 25253 a espe@uakron.edu, bsyo1@uakron.edu, caponce@ciqa.mx, d rziolo@cs.com Keywords: Nanoparticles, composites, polymer, solid-state NMR.
When synthesizing the NPs within the polymer, the polymer matrix plays a role in the cadmium sulfide NP nucleation, growth and structure.
The present studies were undertaken to determine the impact of the polymer on the NP size and structure and the geometry of the polymer/NP interface.
However, the mechanism by which the polymer impacts the structure of the NPs, formed in the polymer's presence, is currently not understood.
Using crystal structures located in the Cambridge Crystallagraphic Data Base, a model for the interface structure has been developed and is shown in Fig. 5.
Online since: August 2013
Authors: Tao Ping Yan
Elaborated with the modern development of new technologies, functional ceramics and their applications are toward the high reliability, miniaturization, film, fine, multi-functional, intelligent, integrated, high performance, high functionality and composite structure direction.
Intorduction Ceramics is a general term of inorganic raw materials on Earth products made by high temperature treatment.Fine ceramic is compared to traditional ceramics, it is using the purity and ultrafine powders of raw materials, the fine structure obtained through a special processing technology and the inorganic non-metallic materials with a variety of functions, with excellent mechanical properties (high temperature strength, high corrosion resistance, high wear resistance) and low density (approximately equal to the steel 1/2).Fine Ceramics can be divided into two categories of engineering ceramics and functional ceramics.
Today, By the research the physics, chemistry and structure of the complex multi-oxide system on the nanometer scale, composition, the relationship between performance and use performance, and by means of ion replacement, doping adjusted to optimize its function, there have been many excellent performance or special properties of nano-functional ceramics.
Foam functional ceramics is a small bulk density, open porosity high, with the characteristics of three-dimensional network structure of porous ceramic materials, high resistance to thermal shock, high temperature resistance, chemical corrosion and good mechanical strength and filter performance , can be widely used catalyst support, filtration materials, heat exchange materials, automobile exhaust purification, the reaction tower and absorber chemical packing.
Intelligent functional ceramic materials, including environmentally sensitive and can make a sensitive response of the material to environmental change,has been become the bright spot in the field of materials science and engineering research.Intelligent functional ceramics, include the a combination of smart material systems or structures of functional materials, drive systems and feedback systems.Because of play to its comprehensive functionality, it has the properties of timely to perceive and respond to changes of the external environment, to achieve self-monitoring, self-diagnosis, self-protection, self-adaptation .
Online since: December 2014
Authors: Yong Gang Shi, Hao Wen, Zi Cun Li, Bin Su, Ping Sun, Hai Feng Gong
Based on structure and composition characteristics of engine oil, the new algorithm for its Infrared Spectrum (IR) Identification has been put forward.
Introduction The structure and composition of Engine oil is very complicated.
The structure and composition of different engine oils are different from each other, even as the same viscosity and quality grade.
The oil’s IR is the reflection of the structure and composition of engine oil, also named the fingerprint of engine oil[7], could be used for the quality index analysis of lubricating oils[8,9].
Chemistry and Technology of Lubricants.
Online since: May 2013
Authors: Chien Chon Chen, Yen Po Wang
We address that AAO based on core-shell nanotubes structure to achieve such a demand.
It is believed that the lower melting point of AAO than pure aluminua because the inclusions are in the porous structure AAO.
It is believed that the lower melting point of AAO than pure aluminua because of the inclusions are in the porous structure AAO.
The AAO structure keeping temperature of 1000℃ is enough stable to be a template for CaO-CaCO3 reaction at 894℃.
Zumdahl, Chemistry, 7TH edition, Houghton Mifflin, New York, USA, (2009), p.353
Online since: April 2015
Authors: Pek Lan Toh, Mohamed Ismail Mohamed Ibrahim, Lee Sin Ang, Sulaiman Shukri
Density Functional Theory Studies of Electronic Structures and Hyperfine Interactions of Muonium in Imidazole Pek Lan Toh1,a*, Shukri Sulaiman2,b, Mohamed Ismail Mohamed Ibrahim2,c and Lee Sin Ang3,d 1Department of Electronic Engineering, Faculty of Engineering and Green Technology, University Tunku Abdul Rahman, 31900 Perak, Malaysia 2Computational Chemistry and Physics Laboratory, School of Distance Education, University Sains Malaysia, 11800 Penang, Malaysia 3Faculty of Applied Sciences, University Teknologi Mara, 02600 Perlis, Malaysia apeklan_toh@yahoo.com.my, bshukri@usm.my, cmi–mi@usm.my, danglee631@perlis.uitm.edu.my *Corresponding author Keywords: Density functional theory, Hyperfine interactions, Muonium, Imidazole ring.
We carried out ab initio electronic structure calculations in the frameworks of the Density Functional Theory (DFT) to study the electronic structures and hyperfine interaction of muonium (Mu) in imidazole (C3H4N2) and 1–methylimidazole (CH3C3H3N2).
In this paper, we present a study of the electronic structures and hyperfine interaction of muonium in imidazole (C3H4N2) and 1–methylimidazole (CH3C3H3N2) by using first principle Density Functional Theory (DFT) technique.
Computational Methodology In this study, all electronic structure calculations were performed using Gaussian 03 and Gaussian 09 packages.
Saeed, Structures amd vibrational frequencies of imidazole, benzimidazole and its 2–alkyl derivatives determined by DFT calculations, Basrah J.
Online since: February 2011
Authors: De Wei Chen
These properties of SPP can be used as a sensor for surface chemistry.
Generally, the SPR sensor structures can be based on either attenuated total reflection prism coupling or metallic grating coupling.
The applicability of such a classical approach to a metallic structure on a nanometer scale in size has been the topic of previous studies.
It has been demonstrated that, for periodic structures, operating near the bandgap is more sensitive.
Online since: January 2013
Authors: Feng Tao, Cong Rong Hu, Zhi Jun Wang, Hai Tao Zhang, Yu Feng Sun, Geng Zhu
To obtain EuF3 crystals with different shapes and sizes, many wet chemistry approaches have been developed [5-7].
Wang et al prepared EuF3 disc-shaped nanocrystals with different crystal structure via Aqueous precipitation method [9].
High resolution transmission electron microscope (HRTEM, JEOL-2010) and selected area electron diffraction (SAED) attached to the TEM were employed to characterize the crystal structure.
We can seen a plenty of almost uniform, regular rod-like structure with 400 nm in average diameter and 950 nm in length from Fig. 2a.
Online since: March 2014
Authors: Fei Yi Yang, Ting Ting Fu, Hong Min Kan, Xiao Yang Wang, Ning Zhang, Hai Bo Long
Introduction Boron nitride(BN) is a kind of non-oxide inorganic ceramic materials, the crystal structure and performance of BN is similar to the graphite carbon[1-2].BN includs five isomers(h-BN, r-BN, c-BN, w-BN, o-BN), among them, h-BN, which is analogous to graphite in its layered structure, as its surface color is white, it is also named the white graphite[3]. h-BN possesses many excellent properties, such as high-temperature resistance, corrosion resistance, good thermal stability, good lubricity, low density, high heat conductivity and low permittivity, etc[4-6].
The hysteresis loops in the adsorption-desorption isotherm of all the samples indicated its porous structures composed by mesopore and micropore.
Industrial & Engineering Chemistry Research. 42(2003)3225-3229
Online since: September 2013
Authors: Ying Meng, Ying Hu, Chen Chen Wei
From Industrial structure compare to total energy consumption, the consumption of Secondary industry was 77%.
And from the trends of industry energy consumption, the consumption of some industries increased year by year, for example Chemistry and Chemical Engineering, Non-Ferrous Metal and Electric Power.
Fig.3 Jiangxi Industriea Sector Energy Consumption Structure Diagram Problems From the current trend of energy consumption of Jiangxi and Its key energy-consuming industries, It is very difficult to achieve the goal about energy conservation and improve efficiency.
Spatial Analysis on the Contribution of Industrial Structure Change to Regional Energy Efficiency-A Case Study of 31 Provinces in Mainland China[J].
Online since: November 2011
Authors: Ai Xian Su, Xue Mei Li, Chong Wen Jiang
Preparation of Aluminosilicate Mesoporous Catalyst and its Application for Production 5-Hydroxymethyl Furfural Dehydration from Fructose Chong-wen Jianga, Ai-xian Sub and Xue-mei Lic College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China ajcwcsu@csu.edu.cn, bhnaixian@163.com, clixuemei7610@126.com Keywords: MCM-41, Fructose, 5-Hydroxymethyl Furfural, Dehydration Abstract.
These well-defined peaks indicates that the long-range order structure is achieved, and the regular mesoporous structure is retained even after hydrothermal treatment in boiling water for 12h, confirming that hexagonal MCM-41 is thermal stable.
It can be seen that the conversion of fructose and yield for 5HMF increase to 83.26 and 51.83%, respectively, due to the higher accessibility of acidic sites in the meosoporous structure sulfonated by sulfuric acid.