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High amount of free amino groups (-NH2), originating from PPD, in the PPy-co-PPD structures made them suitable for chemical immobilization of urease.
In this method, biomolecules are incorporated in the conducting polymer matrix through complementary functional group chemistry.
As shown in Fig. 1a. nanoparticles of PPy (50-75 nm in diameter) tend to segregation and form cauliflower-like structures.
This may originate from bulky structure of PPD that shows large spherical particles of 130-150 nm in diameter, as seen in Fig. 1f.
Increase in nitrogen content arises from lots of free amino groups in PPD structure.

The chemical structure and thermal property of the EPU were studied with FTIR, 1HNMR and TGA, respectively.
People have used many kinds of method, and polymer coating is one of the most basic methods, which including the design of interfacial physics, chemistry and mechanics [7, 12-14].
Results and discussion Chemistry structur 1HNMR and FTIR spectra of EUP are shown in Fig. 3 and Fig. 4.

The melted zone of the surface layer features a quasi-ledeburite structure, consisting of inhomogeneous residual austenite and Cr-containing carbides of MmCn type.
The structure of the surface layer consists of austenite, ferrite and carbides.
Results and discussion Structure and Properties after Hardening.
The fine quasieutectic formed possesses dendrite morphology with columnar structure (Fig.2).
All in all, from the physical-chemistry point of view the transformation of ん + ぜnCm  L (6) is most likely to be performed by dissolving M6C in the melt.

Fig. 1: Schematic structure of a fabricated 4H-SiC PiN diode.
Device structure and fabrication Fig. 1 shows the schematic structure of a fabricated 4H-SiC PiN diode with implanted two-zone JTE and Space-Modulated JTE (SM-JTE) [8] combined.
An improved bevel mesa structure with a mesa height of 1.7 μm and diameter of 300 μm was fabricated by reactive ion etching with a CF4-O2 chemistry using SiO2 as an etching mask [4].
Results and Discussion Breakdown voltage for various JTE structures.
Fig. 2 shows the various JTE structures fabricated in this study.

The FT-IR spectra was quantitatively analyzed and compared in order to discover the change of lignin structures.
The structure of dissolve lignin from black liquor of poplar cooked by soda-AQ cooking was accurately known through FTIR.
Refer to the Faix who put forward the basic structure of lignin unit of the triangle coordinate system, it can be concluded that in the process of getting chromatography acid lignin, in its basic structure unit, Ph—OH Siringyl (S) 40% ~ 50%, Ph—OH Guaiacyl (G) 50% ~ 60%.
The structure of dissolve lignin from black liquor of poplar cooked by Soda-AQ cooking was accurately known through FTIR.
In the process of getting chromatography acid lignin, in its basic structure unit, Ph—OH Siringyl (S) 40% ~ 50%, Ph—OH Guaiacyl (G) 50% ~ 60%.

The structure and elemental compositions were examined by IR spectrum, elemental analysis, NMR(1H,12C spectrum) three measurements; The XRF was used to investigate its exciting and fluorescence spectrum.
Physical-Chemical measurements FT-IR spectrum, 1H, 12CNMR spectrum and elemental analysis were carried out to testify the structure compositions of the complex.
NMR Spectrum; In the molecule structure we can find eight C-H bonds , and there are four H atoms in different positions, so the H bonds have different chemical shifts.
Coordination Chemistry Reviews 171(1998)461-480

These structures self-assemble into nano-spheres, giving rise to structures of higher order such as chains and ribbons, which in turn guide growth of the apatite (Palmer et al., 2008). 
Recent biomimetic advances in rebuilding lost enamel structure. 
At the interface of organic and inorganic chemistry: Bioinspired synthesis of composite materials. 
Chemistry of Materials, 13(10), 3227-3235
Regulated gene expression dictates enamel structure and tooth function. 

Carbon Nanotube Network in Polymer Nanocomposites: Rheology and Flammability Haiyun Ma1a, Jiawei Liu1b, Wenchuan Han1c, and Lici Zhao1d 1College of Chemistry and Environmental Science, Hebei University, Baoding 071002, P.
The flammability properties are strongly affected by the network structure.
Carbon nanotubes (CNTs), due to their unique structure and properties, offer another candidate as a flame retardant additive [7-11].
For the clay or carbon nanotubes filled nanocomposites, it was proposed that a network structure will form when the content of layered clay reaches a threshold value.
The flammability properties of ABS/MWNTs nanocomposites are strongly affected by the network structure.

In addition, the crystal structure transformation from a pyrite structure to a 1T-structure is necessary to prepare the 1T-FeS2.
The troilite structure is formed with equal Fe-vacancy layers [7] and the pyrrhotite structure, with both Fe-full layers and Fe-vacancy layers [8].
Since the vanadium disulfide crystallizes into the 1T-type structure [12], we expect that the vanadium impurity stabilizes the 1T-structure in FeS2.
The crystal structures of the troilite FeS and (Fe0.9V0.1)0.82S are of the distorted NiAs type super-lattice structure attributed to the space group of P-62c.
Structure parameters and bond lengths of troilite FeS. 　

Impact and fracture toughness of a large number of medium carbon alloy steel specimens have been ascertained using standard ASTM procedures, apart from examining their chemistry, microstructure, cleanliness, tensile behaviour and fracture surfaces.
The fractured surfaces of the broken samples exhibited primarily quasi-cleavage feature with microvoids and intergranular facets, typically representative of fractured specimens having tempered martensitic structures.