Search results

Its crystalline structure of non-rosymmetric may result in the property of ferroelectric [10].
Structure characterization.
Research by Zhereb [4-5] concluded that the structure of eulytite Bi4(SiO4)3 can be described as tetrahedrons & octahedrons.
The structure of Bi4(SiO4)3 grains still presents a characteristic of partial ordering.
The crystals present a highly ordered domain structure.

The mechanism of Cu2O photocatalytic reaction:Energy band structures composed of high energy conduction by electrons occupy the valence and empty Cu2O semiconductor particles,there is gap between the valence band and the conduction band.
Figure 1b shows, the molecular structure of chitosan, large number of hydroxyl and amino distribution in its molecule, hydrogen bonds formed between them, resulting in crystallinity chitosan molecules is very strong.
When CS and Cu2O complex, the intensity of diffraction peak decreases, the content of free amino in the Cu2O/CS complexes was reduced, , the intensity of hydrogen bonds formation weakening in the molecular chain CS and Cu2O generated, the molecular structure of CS changes, the ordered structure reduces, the crystallinity decreased, deformability reinforced [4].
Thus, the composite crystal structure of the Cu2O were not significantly affected.
Chemistry World,Vol. 52(2011), p.573-576(in chinese) [4] Jinyi Chen, Jing Zhang, Wenrong Zhang, et al.

Synthesis and Property of Polyurethane Acrylates Modified Graphene Oxide Hongbo Liu 1,a*, Wuying Zhang1, Feng Lin1,b 1School of Applied Chemistry and Biological Technology, Shenzhen Polytechnic, Shenzhen 518055, People’s Republic of China alhb206@163.com, blfeng00@yahoo.com.cn Keywords: synthesis, property, acrylates, graphene oxide.
The graphene oxide was modified by the polyurethane acrylates by the NCO reacting with hydroxyl, its structure and properties were measured.
The structure and properties of graphene oxide are different by those preparation methods.
It shows the surface morphology and structure of the graphene oxide.
The results showed that the polyurethane acrylates did not change the structure of the graphene oxide.

Introduction The crystallographic orientations of neighboring grains determine the structure of the boundary between them, and, accordingly, whether the boundary is mobile or stationary.
This considerably affects the mechanical properties of metallic materials, whose structure is evolving in the course of diffusionless phase transformation, mainly martensitic.
A number of the larger grains of the α-phase were also observed in the structure, which partially or completely lost its nearly lamellar structure.
Raabe, Coupling of electron channeling with EBSD: toward the quantitative characterization of deformation structures in the SEM, JOM-US. 65 (2013) 1229-1236
Physics, Chemistry, Mechanics. 5 (1982) 30-35

Among these three components, lignin is the most recalcitrant to degradation whereas cellulose, because of its highly crystalline structure[2].
This crystalline structure needs to be open to increase its digestibility and subsequently the degree of conversion through pretreatment process.
Table 1 Characteristic of the major constituent in lignocellulosic fiber[3] and its composition in OPEFB Lignocellulosic Material Characteristic Cellulose Hemicellulose Lignin Shape and Physical Structure Slender rod like crystalline microfibrils made of solid cellulose High Order: Crystalline Low Order: Amorphous Random, Amorphous Structure Random, Amorphous Structure Chemical Structure D-anhydroglucose (C6H11O5) repeating units joined by 1,4-β-D-glycosidic linkages at C1 and C4 position.
Alkaline pretreatment disrupts structure of lignin and breaks the linkage between lignin and other carbohydrate making it more accessible [10].
Ragauskas, "Pretreatment and Lignocellulosic Chemistry," Bioenergy, no. 5, pp. 1043-1066, 2012

Fourier transform infrared spectroscopy (FT-IR) spectra show effects of calcination temperature on chemical structure of the fibers.
Introduction In the recent years, there have been growing interests in the fabrication of submicron-sized structure.
Many efforts have been made to transform silica into more manageable structures.
SEM observation reveals the details of fibrous structure.
FT-IR spectra in Fig.5 demonstrates how the chemical structure is altered by heat treatment.

The pore structure parameters of ACs are obtained by using nitrogen adsorption technique.
In this paper, we report on microwave−assisted KOH activation of bituminous coal to prepare ACs with high performance for SC, in which the influence of different gas media on the pore structure and electrochemical properties of AC has been addressed.
Results and discussion Pore structure characterization Fig. 1 shows the variation trend of the activation temperature of AC samples with time under microwave−assisted heating conditions.
Pore structure parameters of ACs prepared in different gas media are shown in Table 1.
Table 1 Pore structure parameters of ACs prepared in different gas media.

The photoluminescence spectrum (PL) indicated that band gaps of Cu2S nanowire arrays also changed simultaneously with the nanowire arrays’ structure parameters.
The Cu2S nanowire arrays would be changed into CIGS nanowire arrays by further alloying with In，Ga，Se and annealing treatment, the singe crystal structure of Cu2S nanowire arrays could improve the crystalline perfection of CIGS.
TEM and XRD revealed that the nanowire is core/shell structure, the core is single crystalline monoclinic Cu2S, the nanowire’s shell is CuxO.
Bhattacharya, Rommel Noufi , CIS and CIGS based photovoltaic structures developed from electrodeposited precursors, Solar Energy Materials and Solar Cells. 59 (2009) 125-135
[6] Wang S H and Yang S H, Growth of Crystalline Cu2S Nanowire Arrays on Copper Surface: Effect of Copper Surface Structure, Reagent Gas Composition, and Reaction Temperature, Chem.

The crystal structure, microstructure, dielectric and ferroelectric properties of samples were investigated by XRD, Raman Spectroscopy, Electrical Measurements and SEM.
The structure remains tetragonal up to x ≤0.05 and becomes cubic for x = 0.10.
In the present work, the effect of Nb5+ on electrical properties and crystal structure of BaTiO3, was studied, the compositions were obtained by the mechanism of electronic compensation (BaTi1-xNbxO3) with x = up to 0.20.
BaTiO3 is a typical ferroelectric with perovskite structure.
West, Basic Solid State Chemistry, second ed., John Wiley and Sons, Chichester, 1999

The configuring relationship of sedimentary micro-facies types and structures controls oil and gas distribution.
The main control factors of oil and gas enrichment Hydrocarbon accumulation mainly influenced by structure, deposition and hydrogeologic.
Oil source faults and sand body have a certain conducting ability, oil and gas migrate along the oil source faults of upper zone of the structure by conducting faults and sand.
Updip accumulation patterns in the study area are mainly distributed upper zone of the structure in the southeast.
Wang: Journal of natural gas chemistry, Vol. 28(2006), p.26 (in Chinese) [3]J.G.