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This process will lead to the changes in surface morphology, components and structures of hydrogels implant.
FTIR spectra were used to assay the components and structures of deposited layer formed on the surface of hydrogels.
This feature indicated the weak crystalline structures of HA particles in PVA hydrogels (Fig.4a) [9].
The Observations of Animal Experiments In order to evaluate the tissue-compatibility and the combination with cartilage, Gradual-structure PVA/HA hydrogel column were prepared and embedded into the cartilage defect made in knee joint of rabbits using an embedding -pressing fixed method.
[4] Darwis D, Stasica P, Razzak MT, Rosiak JM, Radiation Physics and Chemistry, 63(2002), p. 539

Synthesis of Rare earth catalyst LLa[N(TMS)2]·DME(L=3,5-But2-2-HO-C6H2CH-NH-C5H4N) and catalytic behavior for polymerization of rac-lactide Zhu Xi 1, a, Wang Yaorong 1 Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, People’s Republic of China a E-mail: zhuxi_cy@163.com (Zhu xi); Keywords: phenoxyamido, rare-earth complex, polymerization Abstract.
In view of the rare earth metal complex of the catalytic properties are easily affected by ligand steric and around the metal coordination environment, we consider whether the amino aryloxy ligand in coordination sites or increase increased ligand steric hindrance to synthesis of neutral amino aryloxy rare earth metal complex, to inspect the ligand structure for rare earth metals the structure of the complex and complex catalytic behavior.
Results and discussion Crystals of complexe 1 suitable for an X-ray structure determination was obtained from a concentrated toluene solution.
Complex 1 are isostructural, a single nuclear structure bridged by the amino aryloxy ligand, each center of rare earth metal ions is five-coordinated by one oxygen atom and one nitrogen atom of ligand, one nitrogen atom of La-N(TMS)2 and a DME solvent molecule.
Summary We Synthesis compound LLa[N(TMS)2]·DME, its structure feature has been determined by X-ray.

The surface properties which are of the utmost importance include chemical structure and morphology.
Chemical treatments of the cellulosic materials usually change the physical and chemical structure of the fiber’s surface by reacting with the OH group of the cellulose.
The pre-treatment of fibres will affect the performance and interface properties of the fibrous filter media due to changes in the physical and chemical structure of the fibres.
The optical microscope picture shows that the color of fibrous filter media is shining dark brown color due to the addition of chitosan into the structure of the filter media.
Byrd, Fiber Webs, in Handbook of Wood Chemistry and Wood Composites, R.M.

So, there still need to make improvements in materials, processes and structure [8-10].
Experiment 2.1 Materials and cell structure In our experimental, PEDOT:PSS was used as the hole transport layer.
The cell structure studied in our experiments was GLASS/ITO/PEDOT:PSS/P3HT:PCBM/Al. 2.2.
It is easy to form a better network structure to the benefit of the carrier mobility.
Logothetidis, Journal of Materials Chemistry, Forum Vol. 22(2012), p.14624-12632

Normal sulphur crosslink will suffer breakage, cyclization and shortage of crosslinks on sulphur molecular structures when subjected to long or high heat exposure.
However, the vulcanization additive consists of chemical structure with high thermal stability characteristics.
The cure reversion of rubber on the other hand is also influenced by the characteristics of the rubber chain itself such the unsaturated bond structure which prone to the degradation besides of degradation of crosslinking agents in the compounds.
Talma, Rubber Vulcanizates Degradation and Stabilization, Rubber Chemistry and Technology, Vol. 80 (2007) 436-480 [12] Byron H.
Deanin, Polymer Structure, Properties and Applications, Cahners Books (1972) 423-425 [18] Brendan Rodgers and Walter Waddell, The Science of Rubber Compounding, The Science and Technology of Rubber, Elsevier Academic Press (2005) 401-454

Used anaerobic roll tube technique of Henget[13,14] to separate single strain from mixed bacteria. 1.5 Analysis on microbial community structure.
PCR-DGGE technology could community structure in reaction of microbial intuitive[15].
The detected strain was not easy to isolate and culture, and it could reveal the structure of the mixed flora. 
Zhang, Molecular analysis of bacterial community structure in a continental high-temperature and water-flooded petroleum reservoir, FEMS Microbiology Letters. 257 (2006) 92-98
Wang, Analysis of metabolites of microorganisms used for oil recovery, Oilfield Chemistry. 19 (2002) 187-191

These properties are strongly related to the geometrical structure and higher-order structure of the helical main-chain in not only solid phase but also solution state.
However, the helical pitch width, its diameter, and the crystal structures of SPAs have not yet been investigated in detail in the both phases.
Side chain structure dependences for helical pitch and color changes.
After heat-treatment, the hexagonal structure of the pristine polymer was converted to two kinds of tetragonal structure with contracted helix having the straight alkyl chain and stretched helix having the original vent alkyl chain, respectively [12].
The important thing is that the helical structure of Ps2OcP holds not a stretched cis-transoid helix but a typical contracted cis-cisoid structure even at the dichloromethane solution.

Widening than for the cation exchanger gel structure KB-125P (Table 2).
Comparison of Δν for Co- and Cu-form cation exchangers with the original Na-forms suggests that the cation in the gel structure formed complexes Co2+ and Cu2+ same bridge – structure.
Analysis of the IR-spectra of the salt forms of cation exchangers suggests that cation KB-125P gel structure formed complexes Co2+ and Cu2+ same bridge  structure.
On macroreticular cation KB-2E-10 complexes Co2+ have a bridged structure, complexes Cu2+ - bidentate bridging structure.
Kopylova -Valova, Complexing ion exchangers, Chemistry, Moscow, 1980

It was found that the porous structures of the membranes differ significantly from each other.
The samples were transversely cleaved in liquid nitrogen to analyze the structure of the membrane.
It was found that the porous structures of the membranes differ significantly from each other.
Petroleum Chemistry, 56 № 5 (2016) 379-400
A review on membrane fabrication: Structure, properties and performance relationship.

The use of modern methods for studying macroscopic properties and electron microscopy made it possible to study the structure and morphology of the supramolecular formations of the composite.
The work [10] shows the fact of the dependence of the microscopic properties of the composite on the fractal structure.
When studying the geometry of clusters, the term “fractal cluster” arose, representing an association of interconnected particles with a fractal structure [10].
Figure 9 shows the proposed structure of fractal conducting structures in the composite 80% SKI-3 + 20% LDPE + carbon black.
Physical chemistry of the surface.