Search results

Chemistry based structural adhesives and foams enable the intelligent use of all three weight saving methodologies to overcome the problems of safety, quality and high processing cost.
Chemistry based structural materials have been developed by Henkel to increase or maintain stiffness, durability and energy absorption of vehicle components by keeping the same weight or even reduce weight.
Therefore, joining of dissimilar metals by the use of structural adhesives is a tool to avoid galvanic corrosion and to improve the mechanical properties of the metal structure at the same time.
Application of chemistry based structural materials offer the opportunity of joining dissimilar materials.
Therefore, it can be concluded, that the use of chemistry based structural materials enables innovative design and engineering scenarios which are needed to meet the future requirements in vehicle manufacturing.

FEOL and BEOL topics cover: chemistry of semiconductor surfaces, cleaning related to new gate stacks, cleaning at the interconnect level, selective wet etching, resist strip and polymer removal, cleaning and contamination control for various new materials and cleaning after Chemical-Mechanical-Polishing (CMP).

Semiconductor Surfaces, Ultra Cleaning, Precision Cleaning, Wet Cleaning, Contamination Control, Surface Impurities, Surface Defects, Integrated Circuits, Microelectronic Structures, Photovoltaics

Bokov3 and Zuo-Guang Ye 3 1Graduate School of Science and Technology, Niigata University, Niigata 950-2181, Japan 2 Department of Chemistry and Chemical Engineering, Niigata University, Niigata 950-2181, Japan 3 Department of Chemistry, Simon Fraser University, 8888 University Drive, Burnaby, British Columbia, Canada Keywords: Layered Perovskite, Crystal Structure, Solution, Potassium Niobate, Reaction Mechanism, Nanosheet ABSTRACT Using a simple solution reaction, nanoparticles of potassium niobate KNbO3 were synthesized at room temperature.
Figure 2 shows the X-ray absorption near-edge structures (XANES) around Nb K-edge for various samples.
XANES spectra are known to be sensitive to the local structure of a given atom.
This indicates that the local structure of KNbO3 (b) and KNbO3 (c) are very close to KNbO3 (d) each other, while the structure of Nb-O polyhedra in the colloidal solution is different from that of the bulk of KNbO3.
Fig. 2 X-ray absorption near-edge structures (XANES) around Nb K-edge for various samples.

Introduction The structure of nano-materials type has the characteristics of spinel, which nominally MnO-Mn2O3 form is existed by precursor r-MnOOH valence of manganese atoms to MnOOH valence of manganese atoms Mn (+3) form, Manganese oxide as the different structures as the spatial configuration of its internal structure can be divided into divided into layered (or sheet) structure, tunnel-like (or chain) structure and network structure Between manganese ions and the four manganese ions between the double exchange by the middle of the O-E,it is affected on Preparation of nano-materials Mn3O4, particle size, phase purity and crystal.
Mn3O4 crystal structure of nano-materials, a defect structure, these defects are mainly oxygen vacancies, these are the defects in the catalytic activity of different parts of the reaction can be shared edges of the connection and connection can be shared vertex.
It is still equation that Nano Mn3O4 the crystal structure, electronic structure, double exchange model, transport of giant magnetoresistance effect and the basis for such calculations.
Summary: The structure of nano-Mn3O4 material is not the same structure with a single, but diverse, as experienced during the formation of a lot of pressure, the internal distortion of the original materials can be high, shift cycle was a lot of damage, which deviate from the ideal large lattice region, with the particle size reduction, the surface of non-chemical equilibrium, coordination chemistry of non-integer value, the emergence of many active sites, these phenomena can no longer rely on traditional theories of crystal materials, nano materials must be to analyze the structural characteristics of its physical and chemical properties.
References [1] Zhang Tao, perovskite manganese oxide nanomaterials preparation and related materials research, in May 2007, Dissertation, University [2] The right to Kai Chen, Solvothermal Manganese Oxide Nano-magnetic studies, a master's degree thesis, Central South University, January 2003 [3] Zhang yue chen, nano-structured manganese oxide for preparation and Wastewater [4] Xu Guangxian, the basic principles of quantum chemistry and ab initio method, Science Press, June 2009 [5] Wu Yue, modern catalysis, Science Press, May 2005

These reactions are the backbone of polyurethane chemistry.
I & II of Chemistry and Technology, John Wiley & Sons, New York, (1962) and (1964)
McCall: Paper Presented at Third International Symposium on Fluorine Chemistry, Munich (1965)
Pathania, in: Principles of Physical Chemistry, Vishal Publishing Co., India (2003)
Bruce, in: Transition Metals in Supramolecular Chemistry, edited by J.P.

Composition, Surface Structure and Catalytic Properties of Manganese- and Cobalt-Containing Oxide Layers on Titanium M.S.
Rudnev1,2,b 1Far Eastern Federal University, 8, Sukhanova St., Vladivostok 690950, Russia 2Institute of Chemistry, Far-Eastern Branch of the RussianAcademy of Sciences, 159, Prosp. 100-letiya Vladivostoka, Vladivostok 690022, Russia avasilyeva_ms@sns.dvfu.ru,brudnevvs@ich.dvo.ru Keywords:Plasma electrolytic oxidation; Titanium; Coating; Cobalt oxides; Manganese oxides; Surface structure; Nano-whiskers, CO oxidation.
Introduction Recently, transition metal oxides, including those deposited on different substrates, have been extensively used as heterogeneous catalysts in chemistry and oil-refining industry as well as in the processes of treatment of gaseous waste of factories/plants and exhaust gases of motor vehicles [1,2].
In this case the deposited manganese-containing structures are more active in CO oxidation as compared to cobalt-containing ones.
Kung:Transition Metal Oxides: Their Surface Chemistry and Catalysis(Elsevier Press, Amsterdam 1989)

Journal of Materials Chemistry 20 (2010): 831-843
Coordination Chemistry Reviews 159 (1997): 95-108
Inorganic Chemistry 27 (1998): 4179-4182
Inorganic Chemistry 27 (1998): 26-33
Chemistry Letters 33 (2004): 66-67

However, it seems that Si(111) is an exception among semiconductor surfaces concerning the effects of wet chemistry.
(a) and (b) Si(111)(1x1)-H after proper wet chemistry.
(c) and (d) Si(100)-H after wet chemistry; the black arrow in (d) shows local dimer rows.
In contrast, similar smooth surfaces and STM characteristics were not found so far for Si(100) or Si(110) after wet chemistry.
In fact, Si(111) appears to be an exception among semiconductor surfaces in more general concerning the wet chemistry effects.

Phase-transfer catalysis P.T.C is one of the most widely used techniques in the preparation of a wide range of compounds not only in organic chemistry but also a broadly useful in several other areas of chemistry.
Proper to a diversity of pharmacological properties, the structure of 2-pyridone is important in the drug synthesis [21].
Results and Discussion α,β-ketone compounds are widely prevalence in the field of organic chemistry.
Fuhrman, Structure-based design, synthesis, and biological evaluation of irreversible human rhinovirus 3c protease inhibitors, 6. structure−actvity studies of orally bioavailable, 2-pyridone-containing peptidomimetics, J.
South, Design, Synthesis, and Crystal Structure of Selective 2-Pyridone Tissue Factor VIIa Inhibitors, J.

LC-PB-Sp and SC-PB-Sp were synthesized via the combination of anionic polymerization and “click” chemistry methodology.
Furthermore, the retrieval rate of SC-PB-Sp was much faster than its corresponding LC-PB-Sp due to its more compact structure.
In addition, in FT-IR spectrum (Figure 1b), the disappearance of a typical stretching of the azide (2108 cm-1) and the alkyne group (3303 cm-1) gave further support to the occurrence of the coupling reaction, indicating the successful incorporation of coumarin groups into dendrigraft PB matrices via “click” chemistry.
Furthermore, LC-PB-Sp exhibited an even slower speed back to closed form than its SC-PB-Sp analogue, indicating that the more compact 3D structure of SC-PB-Sp was more beneficial for generation of closed form for spiropyran groups.
Summary We successfully synthesized two novel spiropyran-containing polybutadiene with linear-comb and star-comb architecture (LC-PB-Sp and SC-PB-Sp, respectively) via the combination of anionic polymerization and “click” chemistry.