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So then, in the next freeze time, they could form another triple helix structure.
The structure of the membrane seemed to have significant role for this permeability.
The crystallinity of triple helix structure is not as rigid as inorganic crystal structure.
In the gelatin membrane, the crystallinity of triple helix structure still had enough elasticity because of its hydrogen bond as the basic bond which forming this structure.
Putra, Structural organization of poly(vinyl alcohol) hydrogels obtained by freezing/thawing and γ-irradiation processes: A small-angle neutron scattering (SANS) study, Procedia Chemistry, 4 (2012) 186-193

Synthesis and characterization of novel roflumilast analogues Yuhui Sia, Gangchun Sun*,b, Ge Song, Wenpeng Mai, Zhicheng Li School of Chemistry and Chemical Engineering, Henan University of Technology, Zhengzhou 450001, China afengxinzi0321@126.com, bsungangchun@163.com *Corresponding author Keywords: Synthesis; Roflumilast; Analogue; Crown ether Abstract.
A series of new roflumilast analogues with Crown ether structures were designed and synthesized.
roflumilast The research of PDE-4 inhibitor, including the chemical structures and the pharmacophore models, showed that some heterocyclic groups play an important role in their biological activity [8-11].
The structure of objective products was confirmed by infrared spectrum (IR), nuclear magnetic resonance spectra (1H NMR), mass spectra ((MS) and element analysis .
Mass spectrum data further proved that the structures were right.

The relationship between composition, structure and bactericidal properties of titanium dioxide is also established.
Currently, one of the most promising photocatalysts is nanostructured titanium dioxide, mixed crystal structure due to its relatively low cost, high surface area and high efficiency in the oxidation of organic matter and microorganisms [2].
In order to identify synthesis conditions on the composition and structure of titanium dioxide fixed on a support we investigated a series of samples of fine-fiber polymer materials containing nanostructured catalysts on the surface which we got at different pH.
During the second stage, it is removing the interlayer structured water (in the form of OH-groups), followed by dehydration of titanium hydroxide, and crystallization of the titanium dioxide anatase having a tetragonal structure modification , partially or completely transforming into a stable rutile.
Russian Journal of Applied Chemistry. 12, 83 (2010) 2193-2195

The solvent is evaporated and the intercalated structure remains.
Sol gel method Sol-gel chemistry offers a unique advantage in the creation of novel organic- inorganic hybrids.
Besides, nuclear magnetic resonance (NMR) is another important tool for probing surface chemistry and coordination in exfoliated polymer nanocomposites, which may help quantify the level of clay exfoliation.
Biak: Composite structures,2006,75;1-4,496 [60] K.
Muhlhaupt: Rubber Chemistry and Technology Vol. 74 (2001), p. 221 [72] Y.

Whereas alkaline precursor solution (pH = 9) gave rise to flower-like structures of ZnO.
ZnO grown in alkaline environment surprisingly gave a significantly different morphology i.e. of ZnO flower structures with 200-500 nm wide star-like petals and 100 nm sharp tips.
A three-dimensional growth along their axis from the limited number of nuclei will generate star-like flower structures [14].
Rusop, Controlled Growth of Zinc Oxide Nanorods by Aqueous-Solution Method, Synthesis and Reactivity in Inorganic, Metal-Organic, and Nano-Metal Chemistry 40 (2010) 190-194
Xie, Hierarchical Shelled ZnO Structures Made of Bunched Nanowire Arrays, Advanced Functional Materials 17 (2007) 1303-1310

The structure of hydraulic press frame has an extremely significant effect on safety and usability.
Against the structure of frame-type hydraulic press in this paper, a solid model has been built with CAD program Pro/E and the hydraulic press frame under working conditions is simulated by finite element simulation program ANSYS.
Against the structure of frame-type hydraulic press in this paper, a solid model has been built with CAD program Pro/E and the hydraulic press frame under working conditions is simulated by finite element simulation program ANSYS.
Acknowledgements This work was supported by Ministry of Industry and Information Technology of the People’s Republic of China support project under Grant No. 2010ZX04004-121, and Tianjin Key Subject for Materials Physics and Chemistry.
References [1] Xinlu Yu, Jinguang Yang, Kenian Chao: Hydraulic press[M].Machine Industry Press, China 1982 [2] Sen Li, Liang Chu, Jian Zhang: Journal of Machine Design, suppl（2006）, p.83-84 In Chinese [3] Zifen Yu, Liang Chu, Lijun Shi: Construction Machinery and Equipment Vol.39,No.7（2008）, p.35-39 In Chinese [4] Cuifeng Ren:Finite Element Analysis and Optimization of YH30-400 Hydraulic Press Frame Structure [D].

The starch was used as a template to get nanoparticles structure.
Crystalinity particle is 4 – 19 nm and the phase structure of anatase and rutile.
In addition, the differences in internal structure between rutile and anatase are reflected in their properties.
The crystalinity of the particles is 4 – 19 nm and the phase structure of anatase and rutile.
[4] Gaoke Zhang, Xiong Shen and Yang, Fasile Synhesis of Monodisperse Porous Zno Spheres by Soloube Starch-Asisted Method and Their Photocatalytic Activity , The Journal Physical Chemistry 2011, 115 , 7145 – 7152

This structure consist of a polymeric Si-O-Al framework, similiar to that found in zeolites [9].
The main difference to zeolitic structures is that geopolymers are amorphous.
The third step is polycondensation, which the whole system hardens to form a 3D network of silico-aluminate structure [3].
This process resulting in mainly poly(sialate) polymer structures [2].
Davidovits, Geopolymer Chemistry and Applications 3rd ed, Institut Geopolymere (2011), pp. 1-20

The major diffraction peaks of ZnO flakes and nanorods can be readily indexed to wurtzite structure (PDF No.36-1451).
The nanobuds show single crystalline structure with the diameters about 100 nm while the flakes show polycrystalline structure.
Fig. 6(a) shows that the films with flake structure exhibit a relatively strong widened UV emission peak, while the films with two other structures get a rather low UV emission.
TEM and XRD studies confirm that these nanomaterials are highly crystalline structure.
Lévy-Clément: Journal of Electroanalytical Chemistry Vol.621 (2008), p. 171 [18] Th.

Structure of Yttrium Aluminium Garnet obtained by the Glycothermal Method Saburo Hosokawa, Yusuke Tanaka, Shinji Iwamoto and Masashi Inoue* Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Kyoto 615-8510, JAPAN *inoue@scl.kyoto-u.ac.jp Keywords: Y3Al5O12, Rietveld analysis, Defect structure, Glycothermal method Abstract The reaction of a stoichiometric mixture of aluminium isopropoxide and yttrium acetate in 1,4-butanediol (1,4-BG) at 300 ºC directly yielded crystalline yttrium aluminium garnet (YAG), while the reaction in ethylene glycol (EG) afforded an amorphous product in which a large amount of EG moieties remained.
In this work, the morphology and the defect structure of YAG synthesized by the glycothermal method were investigated.