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Online since: December 2012
Authors: Pek Lan Toh, Shukri Sulaiman, Mohamed Ismail Mohamed-Ibrahim
Hargittai: Structural Chemistry Vol. 22 (2011), p. 361
Hargittai: Journal of Physical Chemistry A Vol. 105 (2001), p. 5933
Canadian Journal of Chemistry Vol. 80 (2002), p. 1351
He: Journal of Physical Chemistry B Vol. 108 (2004), p. 17361
Schaefer III: Journal of Physical Chemistry A Vol. 109 (2005), p. 12059
Online since: August 2023
Authors: Zahra Jahanshah Rad, Pekka Laukkanen, Mikko Miettinen, Marko Punkkinen, Kalevi Kokko, Ville Vähänissi, Hele Savin
In particular, we have studied how UHV treatments might be combined with the widely used semiconductor cleaning methodology of wet chemistry.
To contribute to these objectives, we have addressed a question how to combine benefits of the traditional wet chemistry and UHV technology in preparing Si surfaces or interfaces for devices.
This reconstruction is the low-energy structure that an ultraclean Si surface tends to gain if experimental conditions allow its formation.
This wet-chemistry method is surely much more potential for industrial use than the above-described heating up to 1250 oC.
These changes in the structure and chemistry suggest that electrical properties of insulator/Si interfaces might also change.
Online since: February 2011
Authors: A. Burya, O. Kuznetsova, A. Konchits, A. Redchuk
The work examines the structure and properties of nanocomposites based on phenilon C-2 filled with nanostructured carbon.
The achieved positive effect is likely to be provided with the active filler influence on the polymer matrix structure.
Application of spectroscopy in organic chemistry. – M.: Mir. – 1967. – 277 p
IR and NMR spectroscopy of polymers / Reference on physical chemistry of polymers, Vol. 3. – Kiev: Naukova dumka, 1985. – 589 p
Infrared spectroscopy of polymers. – M.: Chemistry, 1976. – 470 p
Online since: July 2012
Authors: He Lin, Shun Guan Zhu, Lin Zhang, Xin Hua Peng, Hong Zhen Li
The performance of 1,5-diaminotetrazole is quite related with the supramolecular structure.
The supramolecular structure of 1,5-diaminotetrazole was investigated by electron density and population analysis.
Results and discussion 3.1 Optimization of structure The molecular structure and unite cell of 1,5-diaminotetrazole are shown in Fig.1, after geometry optimization.
Sabate, Chemistry of Materials, 2008, 20(5), 1750-1763 [4] T.M.
Huang, Chinese Journal of Chemistry, 2011, 29(2), 217-222 [6] A.S.
Online since: May 2011
Authors: Hao Ren, Yu Fen Zhang, Tai Zhong Huang, Juan Wang
Microwave application in chemistry is a new interdisciplinary technology which is called microwave chemistry [1].
All of them clearly indicate that a three-dimensional network structure was formed at the superabsorbent.
The three-dimensional network structure by microwave heating was more uniform and compact than that of conventional heating.
References [1] Qinhan Jin: Microwave Chemistry.
[3] Hongke Tang, Qi Chen: Chinese Journal of Synthetic Chemistry Vol.15 (2007), p. 643
Online since: November 2011
Authors: Zhi Peng Xie, Zhong Zhou Yi, Feng Rui Zhai, Bo Wang
ZnO nanopowder have been prepared by chemistry liquid-phase method with the water soluble polymer and the surfactant as additive in [Zn(OH)4]2- precursor solution.
In this paper, we report a simple chemistry liquid-phase method to synthesize ZnO nanopowder with the water soluble polymer and the surfactant as additive in [Zn(OH)4]2- precursor solution.
It is Very small diameters, forming ratio the unitary structure.
Experiments also join PEG and SDS, It’s first interaction, shaped like a copolymer composite structure, the compound has water-loving and scanty water can also occur in solution and the role of inorganic particles, forming a hexagonal structure and get the growth of particle length-diameter ratio is very small.
Chemistry & Bioengineering Vol. 23 (2006), p.39
Online since: June 2012
Authors: Xue Song Tang, Ming Li
Each nanoparticle has a single crystal structure.
The surface chemistry of Fe3O4 nanoparticles was characterized by FTIR (Fourier transform infrared spectroscopy, Nicolet 6700).
Results and Discussion Surface chemistry of Fe3O4 nanoparticles.
Structure and morphology of Fe3O4 nanoparticles.
The crystal structure of the nanoparticles was characterized by X-ray diffraction as shown in Fig. 3.
Online since: April 2008
Authors: Johannes Kirchhof, Sonja Unger, B. Knappe
The doping concentration in dependence on the experimental conditions (gas concentrations, flow velocity, temperature) can be understood and quantitatively described on the basis of the chemical thermodynamics (equilibrium chemistry) of the systems.
This makes possible the defined preparation of complex fiber structures in terms of refractive index profiles and multielement distributions.
The fabrication of tightly controlled complex fiber structures requires a detailed understanding of each process step.
On the basis of these results and taking into account the mechanism of fluorine incorporation [4], here we have calculated the chemistry for the codoping of silica with germaniun/fluorine and boron/fluorine, respectively.
The real molecular structure of the components is characterierized by network groups as ≡ Si - O- Ge ≡ , ≡ Si - O- B = and ≡ Si - F.)
Online since: July 2011
Authors: Yong Wang
Now I’d like to talk about my experience in implementing the new teaching plan combined the practice of teaching reform of Inorganic Chemistry Course newly issued by my office.
Current setup state of Inorganic Chemistry in new teaching plan In the new personnel training sheme, my office’s task is teaching inorganic chemistry and organic chemistry, totally five undergraduate specialty subjects like fire protection engineering and two college speciality subjects like fire proofing management.
Among them, inorganic chemistry is diveded into A,B,C,D four levels and has 36 periods, reduced by 40%.
Teaching reform of inorgnic chemistry in new edition personnel training sheme Regarding the theoretical teaching periods of inorganic chemistry changes in the new edition persennel training sheme this term and combing the students’learning basis and requirements of new teaching syllabus, we condensed and integrated the new knowledge teaching system.
For example, when teaching Hybrid Orbital Theory and molecular structure, we give them three questions firt.
Online since: September 2016
Authors: Bohuslav Mašek, Hana Jirková, David Aišman, Kateřina Rubešová, Kateřina Opatová, Filip Vančura, Martin F.X. Wagner
This paper describes selected capabilities of unconventional processing of steels in semi-solid state under various process conditions and with the use of various steel chemistries to obtain unusual structures formed by rapid solidification in combination with other procedures.
To be more precise, the chemistry and structure of the material must be selected in such a way as to facilitate or at least permit the implementation of the chosen strategy for obtaining the intended condition of the final microstructure of the product.
The workpiece can be modified by not only its chemistry but by other methods as well.
After mini-thixoforming at 1450–1460°C, a fully-martensitic structure of 600–700 HV10 hardness was obtained.
Upon mini-thixoforming, its structure consisted of the MA constituent.