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FTIR shows that chemical structure of the molecular chain of the MC nylon 6 is not changed with adding hydrotalcite; SEM reveales that LDHs (2.5, wt-%) has good dispersion and compatibility in the MC nylon 6 matrixes; but when the amount of LDHs is excessive, the composites show obvious phase separation phenomenon.
Curve b not only appears in the same position with Curve a characteristic absorption peaks, but also has an absorption peak at 962 cm-1, which increases in the Al-OH absorption peak, indicating that hydrotalcite added does not change the molecular structure of the MC nylon 6 and the hydrotalcite sheet layer inserts MC nylon 6 matrixes.
The intercalation structures plays a role of “physical crosslinking points” among the matrixes, thereby improving the strength of the composites.
It is manifest that when the hydrotalcite excesses, the intercalated structure disperses unevenly, stack together, and has poor bond strength as well as bad compatibility.
(In Chinese) [7] Li Lei, Liu Shi Jun and Li Bao Shan: Journal of Inorganic Chemistry Vol.23(2007), p.407.

IR-spectra showed that phosphomolybdic acid kept its Keggin structure, and it interacted with PMMA through hydrogen bond.
Keggin structure which is one of six main polyoxometalate structures is large cage-like molecules formed by tetrahedron of the central coordination hetero-atom and octahedron of polyacid coordination groups through Oxo Bridge.
Phosphomolybdic acid has the Keggin structure and the basic properties with heteropoly acids [1, 2].
Infrared test (not showed) indicates that the composite membrane of phosphomolybdic acid still retains the basic framework of heteropolyacids with Keggin structure; Keggin structure composite films of PMo12 have been combined to form a complex with strong molecular force-hydrogen bond with PMMA molecules.
Linhardt: Green Chemistry Vol. 12(2010), p. 1883-1892

In order to protect its surface electronic structure, we use physical means to deal with carbon nanotubes.
Chen et al. found the functional structure of the plane π-π stacking interactions[4] in aromatic molecule in 2001.
Experimental study manifests a very stable self-assembled structure in an aqueous solution.
We used SEM scanning to analyze and research more detailed structures and characters of the carbon nanotubes surfaces.
The Journal of physical Chemistry B. 1294-1298, 06(2002)

The compound ZnFe2O4 demonstrates a normal spinel structure with Zn2+ in tetrahedral and Fe3+ in octahedral sites [2].
According to the literature [4], the cubic spinel structure exhibits seven peaks located between 20 and 70 degrees.
Analysis of the XRD patterns of all samples confirmed the formation of the cubic spinel structure.
The spinel crystal structure is maintained on element substitution.
Physical Chemistry Chemical Physics, 2011. 13(41): p. 18609–18614

The composition, structure, morphology and photocatalytic activity of the samples were researched by means of modern testing techniques.
The crystal structures and morphologies of the as-prepared samples were characterized by modern testing technolog.
The particles are irregular and the leaf structure of pure BiVO4 is still remained when La doping content x = 0.1.
However, the leaf structure seems be destroyed and dimetric structure can be observed with the increasing of La3+content. when the mole ratio of La3+ reach 0.5 and 0.7, the morphology become regular and uniform.
The structure and morphologies of samples were different as the change of La3+ contents.

Produced duplex stainless steels have been studied by SEM with EDS and light optical microscopy (LOM) and X-rays analysis to determine obtained structures.
The marked points on the graph determine the forecast structure of the compositions. included in the range of 7.13 to 7.25 g/cm3.
The obtained results prove the usefulness of the Schaffler's diagram for predicting the types of sintered duplex steels structures.
Austenite and ferrite are well mixed with an observed balancing between the two structures present throughout the sample.
Upadhyaya, Materials Chemistry and Physics Vol. 67 (2001), pp.234-242

The aim of the present work is to study the influence of Fe/Cr on the structure and infrared radiant properties.
The analysis of XRD patterns indicated that all samples have spinel cubic structure.
S, Simulation of coordination center cations distributing in spinel mineral structure, J.
Wen, Relationship between infrared radiation and crystal structure in Fe-Mn-Co-Cu-O spinels, Acta Metall.
Zhang, Physical Chemistry of Metallurgy, Metallurgy Industry Press (in Chinese), Beijing, China, 2004

The effects of single annealing and multistep annealing on the structures and electric properties of the films were investigated.
The crystal orientation and structure of the antiferroelectric thick films were studied.
In order to study the influence of sintering procedures on the properties of (Pb,La)(Zr,Ti)O3 thick films, structures and dielectric properties as a function of electric and temperature field were discussed in detail.
It can be seen from fig.1, the PLZT thick films by multistep annealing showed more highly (100) and (200)-preferred orientation and displayed a purer perovskite structure than that by signal annealing.
Materials Chemistry and Physics, Vol. 80: 294–298 (2003)

Rice Hull Micro and Nanosilica: Synthesis and Characterization Worawat Jansomboon1, a, Khatawut Boonmaloet1,b, Suradet Sukaros1,c and Paweena Prapainainar1,2,d* 1National Center of Excellence for Petroleum, Petrochemicals and Advance Material, Department of Chemical Engineering, Faculty of Engineering, Kasetsart University, Bangkok 10900, Thailand 2Department of Chemistry and NANOTEC Center for Nanoscale Materials Design for Green Nanotechnology, Kasetsart University, Bangkok 10900, Thailand aLiver_wat11@hotmail.com, bkhatawut_ku@hotmil.com, csuradetbankksc@gmail.com, dfengpwn@ku.ac.th * Corresponding author.
The result showed the silica structure became more crystalline when the temperature was increased.
When the concentration of sodium silicate increased, more agglutination occurred in the silica structure.
Types of silica Mean diameter ( nm ) Standard derivation Commercial silica 49.51 5.42 Calcination at 500 ˚C 208.28 35.20 Calcination at 600 ˚C 78.08 11.27 Calcination at 850 ˚C 71.77 19.84 Precipitated 2 M NaOH 47.67 9.16 Precipitated 2.5 M NaOH 55.84 8.88 Precipitated 3 M NaOH 55.67 10.75 Component of Silica Table 2 shows the purities and chemical components of silica structure for each sample which were determined by using energy dispersive X-ray spectrometer ( EDS ).
Table 2 Chemical components in silica structure for each type.

a b d c Fig.1 Macro-morphology of welded joint of different welding speed The influence of the welding speed on the microstructure of the welding joint.The weld nugget zone was located in the center of the weld, was nearly the same to size of the stirring pin, was complete dynamic recrystallization structure[6-7], it is because this region was affected by strong mechanical stirring effect of the stirring pin and by partial high temperature due to the strong friction, the structure became from the strip rolling structure of the original base material to the fine equiaxial structure, and the grain size of the upper weld structure is bigger than the lower structure, shown in fig.2, and the welding speed of the fig.2a~fig.sd is 50mm/min, 100mm/min, 200mm/min, 300mm/min respectively.
a d b c Fig.2 Microstructure of the weld nugget zone of different welding speed e f j k Fig.3 Microstructure of the TMAZ of different welding speed The influence of the welding speed on the mechanical properties of welding joint.As shown in fig.4, when the rotating speed was 800r/min, the tensile strength of the welding joint increased at first and then stabled basically, especially the tensile Strength of the welding joint had not change when the welding speed greater than 1000mm/min, this was because welding heat input was bigger when the welding speed was lower, leading to structure became bigger and heat affected zone was wide.
[8] Litynska L, Braun R, Staniek G:Materials Chemistry and Physics Vol.81(2003),p. 293-295