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Online since: July 2012
Authors: Han Kun Feng, Jin Liang Zhang, Guo Cai Tian
They have many fascinating physical properties which make them of fundamental interest to all chemists, since both the thermodynamics and kinetics of reactions carried out in ionic liquids are different to those in conventional molecular solvents, then the chemistry is different and unpredictable at our current state of knowledge.
Thus understanding the structure, interactions and dynamics properties of water or other small impure molecules in ionic liquids can help us control or remove these impure species.
More recently, both experiments and computer simulation have been used to reveal the structure and dynamics of the mixture of ionic liquids and water to understand the chemical reactivity and solvation properties of these liquids [8-20].
Rogers, , Green Chemistry, Vol 3, 2001, p 156.
Thus understanding the structure, interactions and dynamics properties of water or other small impure molecules in ionic liquids can help us control or remove these impure species.
More recently, both experiments and computer simulation have been used to reveal the structure and dynamics of the mixture of ionic liquids and water to understand the chemical reactivity and solvation properties of these liquids [8-20].
Rogers, , Green Chemistry, Vol 3, 2001, p 156.
Online since: December 2012
Authors: Zhong Hua Huang, Fang Yuan, Xue Pu, Hui Zhang, Zheng Li Liu
It demonstrated Pseudomonas fluorescens sp.was a short, motile, rod with more than one polar flagellum (The morphological structure of Pseudomonas fluorescens sp. was characterized by JEOL JSM-6380LV type Scanning Electron Microscopy).
By referring to the handbook of analytical chemistry (spectroscopic analysis volume)[10] get that the maximum absorption wavelength of 240.3nm maybe 4-methly-5-nitrocatechol; aniline was 230nm; and 2-hydroxy-5-methly benzoquinoue could be at 233nm.
But this is only a preliminary qualitative analysis, specifically generated the structure determination by NMR and Mass spectra of the compound are needed for future identification.
Toyama, in: The Handbook of Analytical Chemistry, volume 3 of Spectral analysis, edtied by Chemical Industry Publications, Beijing, 2000
By referring to the handbook of analytical chemistry (spectroscopic analysis volume)[10] get that the maximum absorption wavelength of 240.3nm maybe 4-methly-5-nitrocatechol; aniline was 230nm; and 2-hydroxy-5-methly benzoquinoue could be at 233nm.
But this is only a preliminary qualitative analysis, specifically generated the structure determination by NMR and Mass spectra of the compound are needed for future identification.
Toyama, in: The Handbook of Analytical Chemistry, volume 3 of Spectral analysis, edtied by Chemical Industry Publications, Beijing, 2000
Online since: December 2003
Authors: Besim Ben-Nissan, Bruno A. Latella, A.W. Eberhardt, R. Roest, Richard Wuhrer
Ben-Nissan
1
1
Department of Chemistry, Materials and Forensic Science, University of Technology, Sydney,
PO Box 123, Broadway, N.S.W., 2007, Australia
2
Department of Biomedical Engineering, University of Alabama at Birmingham, Birmingham,
AL, 35294, USA
3
Materials and Engineering Sciences, ANSTO, PMB 1, Menai, N.S.W., 2234, Australia
4
Microstructural Analysis Unit, University of Technology, Sydney, PO Box 123, Broadway,
N.S.W., 2007, Australia
Keywords: Adhesion, phosphate treatment, nanocoatings, zirconia, sol-gel, titanium, anodizing
Abstract.
This process involves the conversion of the rutile structure of the original titanium oxide into a mostly crystalline anatase structure.
The nanocoatings were prepared by alkoxide sol-gel chemistry, using techniques and protocols developed in an earlier work and were examined with x-ray diffraction, and scanning electron microscopy.
This process involves the conversion of the rutile structure of the original titanium oxide into a mostly crystalline anatase structure.
The nanocoatings were prepared by alkoxide sol-gel chemistry, using techniques and protocols developed in an earlier work and were examined with x-ray diffraction, and scanning electron microscopy.
Online since: January 2017
Authors: Li Yi Shi, Xing Dong, Wen Qi Yu, Li Ya Chen, Guo Jun Ding, Pei Song Zong, Qi Lu, Ji Fang Fu
Octa-aminophenyl polyhedral oligomeric silsesquioxanes (OAPS) was synthesized according to the procedures described in literature. [6] The morphology of OAPS can be seen in the TEM in Fig. 2a exhibit the hollow structures of OAPS.
The hollow structures of OAPS microspheres are convenient to introduce voids into the EP to take advantage of the low dielectric constant of air (ε=1).
Bill, Chemistry of Materials, 20 (2008) 5593-5599
Zheng, Chemistry of Materials, 16 (2004) 5141-5148
The hollow structures of OAPS microspheres are convenient to introduce voids into the EP to take advantage of the low dielectric constant of air (ε=1).
Bill, Chemistry of Materials, 20 (2008) 5593-5599
Zheng, Chemistry of Materials, 16 (2004) 5141-5148
Online since: February 2013
Authors: Han Xu Li, Zhong Bing Dong, Qiao Liu
Fig. 3 shows that DTG curve of RPC has bimodal structure at the temperature ranged from 900℃ to 1300℃.We definite the peak as LTP (Low Temperature Peak) at the temperature ranged from 950℃ to 1050℃ and the peak as HTP(High Temperature Peak) at the temperature ranged from 1200℃ to 1250℃.
The DTG diagram of petroleum coke has a structure of bimodal.With the increase of adding amount of FeSO4, LTP to the side of low temperature and the value between HTP and LTP decreases.
Journal of Feul Chemistry and Technology 2007, 35, 313-318(In Chinese)
Journal of Fuel Chemistry And Technology 2000, 28, 37-38(In Chinese)
The DTG diagram of petroleum coke has a structure of bimodal.With the increase of adding amount of FeSO4, LTP to the side of low temperature and the value between HTP and LTP decreases.
Journal of Feul Chemistry and Technology 2007, 35, 313-318(In Chinese)
Journal of Fuel Chemistry And Technology 2000, 28, 37-38(In Chinese)
Online since: November 2015
Authors: Wei Min Wang, Si Si Yu, Ke Mei Pei
Extraction and Analysis of the Surfactants in a Detergent by Combined Chemical and Instrumental Approaches
Weimin Wang1,2, Sisi Yu1,2, Kemei Pei1,2,*
1 Engineering Research Center for Eco-Dyeing & Finishing of Textiles, Ministry of Education, Zhejiang Sci-Tech University, Hangzhou 310018, China
2 Department of chemistry, Zhejiang Sci-Tech University, Hangzhou 310018, China
*Corresponding author: Kemei Pei; E-mail: xiaopei027@sina.com
Keywords: Surfactant; Separation; Analysis; Detergent.
Fig. 5 The ESI-MS spectrum of MP Conclusion This work presents a systematic approach which has been proved very effective in the surfactant structure elucidation for the chemical products.
The surfactant structure in the target products can be analyzed by UV absorption spectrum, FT-IR and ESI-MS exactly.
Gu, Surfactant Chemistry, Press of University of Science and Technology of China, HeFei. 2 (2008) 33-34
Fig. 5 The ESI-MS spectrum of MP Conclusion This work presents a systematic approach which has been proved very effective in the surfactant structure elucidation for the chemical products.
The surfactant structure in the target products can be analyzed by UV absorption spectrum, FT-IR and ESI-MS exactly.
Gu, Surfactant Chemistry, Press of University of Science and Technology of China, HeFei. 2 (2008) 33-34
Online since: November 2007
Authors: Stefan Detterbeck, Enrico Bellandi, Mauro Alessandri, Sally Ann Henry, Leo Archer, Thomas Hellweg, Michael Kagerer, Ladislaus Brilz
Up to three
chemistries can be fully re-circulated or used single-pass and then drained.
Additionally, the system is capable of double-sided processing to simultaneously dispense chemistry onto both sides of the wafer.
For example, wafers that are patterned and structured with a dry etch are easier to strip than blanket wafers.
Table I: Comparison of strip times for wafer with various photoresist conditions Pre-treatment/Implant Implant Energy Process Conditions Time to Clear Photoresist After structuring n/a ~ 3 sec.
Additionally, the system is capable of double-sided processing to simultaneously dispense chemistry onto both sides of the wafer.
For example, wafers that are patterned and structured with a dry etch are easier to strip than blanket wafers.
Table I: Comparison of strip times for wafer with various photoresist conditions Pre-treatment/Implant Implant Energy Process Conditions Time to Clear Photoresist After structuring n/a ~ 3 sec.
Online since: April 2007
Authors: Qiang Li, Zheng Lan Lu, Guo Qiang Zhu, Dan Yu Jiang, Cheng Zhang, Lei Hu
Low Temperature Degradation of Yttria Stabilized Zirconia
Zhenglan Lu1, Danyu Jiang1, Lei Hu
1, Guoqiang Zhu1, Qiang Li2 and
Cheng Zhang3
1
Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
2
Department of Chemistry, East China Normal University, China
3
Department of Materials Engineering, Shanghai Institute of Technology, China
Keywords: degradation, TZP
Abstract.
Microscope imaging displayed the changes of aged TZP surface structure.
Microscope imaging displays the changes of aged TZP surface structure.
Microscope images in Fig.2 indicate the surface structure of TZP samples after LTD process.
Molecular Structure Vol.703 (2004), p. 19 [4] S.
Microscope imaging displayed the changes of aged TZP surface structure.
Microscope imaging displays the changes of aged TZP surface structure.
Microscope images in Fig.2 indicate the surface structure of TZP samples after LTD process.
Molecular Structure Vol.703 (2004), p. 19 [4] S.
Online since: September 2007
Authors: Xiao Yong Wang, Hai Moon Jung, Han Seung Lee
Chloride penetration into concrete is the main cause of steel corrosion in concrete
structures exposed to chloride-rich environments.
The service life of concrete structure members under two-dimensional chloride penetration is predicted by compared with a critical threshold chloride concentration.
It also leads to future structure distress due to the loss of a reinforcing steel cross-sectional area as well as loss of bond along the steel-concrete interface.
Generally, the service life of concrete structures consists of two phases: the first phase is the diffusion period until the chloride concentration on the surface of a rebar reaches a threshold value over which the corrosion of steel rebar will occur; the second phase is a physics-chemistry process related to the corrosion of steel rebar.
As shown in fig. 4, the service life of a concrete structure in a two-dimensional chloride attack will be significantly shortened.
The service life of concrete structure members under two-dimensional chloride penetration is predicted by compared with a critical threshold chloride concentration.
It also leads to future structure distress due to the loss of a reinforcing steel cross-sectional area as well as loss of bond along the steel-concrete interface.
Generally, the service life of concrete structures consists of two phases: the first phase is the diffusion period until the chloride concentration on the surface of a rebar reaches a threshold value over which the corrosion of steel rebar will occur; the second phase is a physics-chemistry process related to the corrosion of steel rebar.
As shown in fig. 4, the service life of a concrete structure in a two-dimensional chloride attack will be significantly shortened.
Online since: June 2018
Authors: Habibollah Faraji, Reza Kazemi Oskuee, Reza Nedaeinia, Esmaeil Nourmohammadi, Bizan Malaekeh-Nikouei, Hamid Reza Sadeghnia, Seyyed Payman Ziapour, Hoda Khoshdel Sarkarizi
Carbon nanotubes discovered in 1991 are tubular structures similar to sheet of graphite.
Another core–shell structure was formed by nanoprecipitation approach.
Dai, Supramolecular chemistry on water-soluble carbon nanotubes for drug loading and delivery, Acs Nano. 1(2007) 50-56
Giersig, Quantum dot modified multiwall carbon nanotubes, The journal of physical chemistry B. 110 (2006) 12901-12904
Seifalian, Cancer Antibody Enhanced Real Time Imaging Cell Probes–a Novel Theranostic Tool using Polymer Linked Carbon Nanotubes and Quantum Dots, Anti-Cancer Agents in Medicinal Chemistry (Formerly Current Medicinal Chemistry-Anti-Cancer Agents). 13(2013) 821-832
Another core–shell structure was formed by nanoprecipitation approach.
Dai, Supramolecular chemistry on water-soluble carbon nanotubes for drug loading and delivery, Acs Nano. 1(2007) 50-56
Giersig, Quantum dot modified multiwall carbon nanotubes, The journal of physical chemistry B. 110 (2006) 12901-12904
Seifalian, Cancer Antibody Enhanced Real Time Imaging Cell Probes–a Novel Theranostic Tool using Polymer Linked Carbon Nanotubes and Quantum Dots, Anti-Cancer Agents in Medicinal Chemistry (Formerly Current Medicinal Chemistry-Anti-Cancer Agents). 13(2013) 821-832