Search results

Quantum Chemical Study on Structure Properties of Pyridine Ionic Liquids of Different Chain Lengths Substituent Group Li Long1,a , De-qing Chu1,b* , and Li-min Wang2,c* 1 Faculty of Environment and Chemical Engineering, Tianjin Polytechnic University, Tianjin China 2 Faculty of Materials Science and Engineering, Tianjin Polytechnic University, Tianjin China a longlili1314@126.com, bchu2dq@tjpu.edu.cn,cwanglimin@tjpu.edu.cn Keywords: ionic liquids; pyridine; hydrogen bond; binding energy.
However, there are few studies on the structure and the nature of ionic liquids, bimidazole-based ionic liquids theoretical calculations are more reported [6].
The pyridine ionic liquid structures with some kinds of chain length substitute were researched by quantum chemical calculation, the combinative fashion between the anion and action and their interactions are analyzed, the structural features of ionic liquids are understood deeply, such as the electrostatic fashion between cation and anion, the hydrogen bond in ionic liquid, the interaction energy between anion and action, the relationship between its structure and property are understood.
The optimized geometries of ethanol pyridine chloride with B3LYP/6-31G * are shown in Figure 2, part of the structures are shown in Table 1, the hydrogen bond lengths formed by chloride ions and ethanol pyridine are listed in Table 2, the ionic liquid binding energy are shown in Table 3.
Progress in Chemistry, Vol. 15(3) (2003), p. 222

It mainly includes determining model’s structure, estimating the unknown parameters and testing model’s effect.
To determine the antecedent structure and parameters of fuzzy model This article selects the adaptive fuzzy grid network to identify the structure of the system to divide fuzzy space, determines the relationship between output language items and fuzzy regions.
After divided, the fuzzy space which has been fuzzy grid determined the structure of the fuzzy rules.
This fuzzy model of identification provide simple structure identification, easy to implement, offline or online for identification.
Springer Sept. (2009) [6] Eleni Farmaki, Nikolaos Thomaidis, Constantinos Efstathiou, Artificial Neural Networks in water analysis: Theory and applications [J], International Journal of Environmental Analytical Chemistry.

Firstly, studies of natural apatites have shown that this mineral phase is highly resistance to radiation damage.2 This property has also been confirmed in accelerated ageing studies, using the short lived 238Pu isotope, where no radiation damage was detectable by XRD after the equivalent of 400 years ageing.3 Also, apatites are known to accommodate a range of actinides.4 Also, apatites are known to accommodate non-stoichiometric compositions, which allow the structure to cope with variations in the waste stream composition. 5 Apatite can be described as a tunnel structure (Fig 1) composed of corner connected CaO6 and PO4 polyhedra where the tunnels, extending through the structure in the c-direction, are filled by calcium ions and anions (F , Cl- or OH ).
Studies have shown that the calcium ions can be substituted by a range of cations to high concentration. 6,7 Fig 1 Structure of fluorapatite, showing tunnel structure.
Elliot, Structure and Chemistry of the Apatites and Other Calcium Orthophosphates, Chap 3, Elsevier, Amsterdam 1994. 6.

Conway 2 and Besim Ben-Nissan 1 1 Department of Chemistry, Materials and Forensic Science, University of Technology, Sydney, P.O.
The Palette CAD database software was used to reconstruct the digitized co-ordinate data "wire frame" structure.
Implants were modeled as a solid structure with abutments that were 2mm high.
The displacement measured in the osseous structure was found to be lower with the inclusion of dental implants.
The distribution of principal stresses in the dental implants and around the osseous structure (both cortical and cancellous bone) was slightly higher with alumina implants.

A pre-existing template structure is required for the deposition of nanotubes using these techniques [6].
The most common template structures used are polycarbonate [3,5] or anodic aluminium oxide (AAO) [4,7] membranes.
The chemistry of the electroless deposition reaction has since been described and understood [9].
The composition and structure of the deposited Co-B nanostructures were analyzed using X-ray diffraction (XRD) and X-Ray Photon Spectroscopy (XPS).
XRD analysis indicates that the Co-B deposit is an amorphous structure (data not shown).

Introduction In recent years, research into Side-chain liquid crystalline polymers (SCLCPs) has expanded rapidly, and monomers or polymers with blue phases (BP) structures have attracted considerable interest because they have outstanding optical properties[1,2].
The helical structure of the BP is responsible for this effect: it electively reflects visible light and exhibits brilliant colors[3,4].
(c) (b) (a) a) Fig. 2 Optical textures of polymer (100×): (a) a nematic schlieren texture at 16 ℃, (b) a spherulite texture of polymeric smectic A phase on cooling to 198.5 ℃ and (c) a spherulite texture of polymeric smectic A phase on cooling to 158.5 ℃ XRD studies were carried out to obtain more detailed information on the mesogenic phase structure.
In general, a sharp and strong peak appeared at low angles (1 °≤ 2θ≤4 °) in small-angle X-ray scattering (SAXS) curves only for smectic phase structures; a broad peak associated with lateral packing at about 2θ =20 ° was observed in wide-angle X-ray diffraction (WAXD) curves for nematic, smectic, and cholesteric phase structures[7].
A sharp and strong diffraction peak at 2θ= 7 ° was observed for monomer which suggested this platelet texture of a blue phase showing the ordered long-range orientation and cholesteric structure; a representative peak associated with the bule phase was observed at 2θ=17.0 ° in the WAXD curves.

The XRD pattern indicated these synthesized products consisted of SiC and Si structures.
We estimated Si structure maybe from Si substrate.
The XRD pattern showed peak of heated products comprise of SiC, SiO2 and CuO structures.
The XRD pattern indicated these nanoparticles consisted of SiC, SnO2 and SiO2 structures.
The structures of heated product have been investigated by scanning electron microscope and X-rays diffraction instruments with appropriate methods.

Because the structure and loads of fiber couplers are symmetry with xoy plane, in order to enhance the computing speed, the problem can be simplified to plane problem (Shown in Fig.1).
The shape and structure of fibers change unceasingly in the process, so the position of one specified point on the fiber will be continuously changed in the flame, and its temperature also changes relevantly.
In the whole process, the change of temperature field will affect the structural stress, and the change of structure shape also effects the distribution of temperature field.
In this article, thermal analysis element and structure analysis element are selected.
Chemistry and Physics, Vol.69 (2001), pp.199-203.

The morphology and crystal structure of the obtained particles were characterized by SEM (Scanning Electron Microscopy) and XRD (X-Ray Diffraction).
Mg-LHS have layered structures with the thickness of ca.100 nm and the diameter of 2 mm.
In the case of Mg-LHS with less intercalated Cl which was synthesized low initial MgCl2 concentration, that structure was unstable than Mg(OH)2 because the bonding force was not enough to keep layer structure.
When the intercalated Cl- was less than the stoichiometry composition, the structure stability decreased dominantly.
Kato, Chemistry Letter, 37, 11, (2008) 1140-1141 [6] O.

High oil-absorbing resin refers to resins with three dimension networks and cross-chemical link structures [1].
Ammonium persulfate (APS, Yonghua Fine Chemistry Co.
Effect of cross-linking mass fraction on oil Absorbency Effect of Cross-linking Agent Mass Fraction on Oil Absorbency The oil absorbency of the resin is essentially determined by the molecular structure, and the amount of cross-linking determines the degree of cross-linking of resin size, and three-dimensional netted structure of the extended capacity.
The oil absorbency of resin mainly depends on the network structure of resin, the salvation effect between resin segments pro-oil and oil molecule. 
When the cross-linking agent content decreases, the resin cross-linking lowers, and the imperfect network structure within the resin leads to the increase of the solubility of resin in oil.