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However, the mechanism of nanofibril formation remains unclear to date, and the lack of an appropriate theoretical model does not allow evaluation of the structure parameters depending on the process conditions.
It seems reasonable to concentrate on the modelling of the initial stage of the fibril growth, which is crucial for the further structure parameters.
Thus, we propose a new model of the nanofibril structure formation, which is basically concordant with all known experimental findings.
Phase-field approach was applied to support the model and develop a basis for further quantitative investigation and prediction of structures’ parameters.
Kanaev, Porous monoliths consisting of aluminum oxyhydroxide nanofibrils: 3D structure, chemical composition, and phase transformations in the temperature range 25 – 1700 °C, J Nanopart Res 20 (2018) 194-204

The samples showed a better crystalline structure when it was sintered for 24 h as compared to 7 h.
Therefore, it is interesting to study the crystal structure of borophosphate compounds.
It can be found that the structure of the powder is in pure hexagonal phase (2SrO·P2O5·B2O3).
The structure of Li3(PO4) is in pure orthorhombic phase, which is similar to that reported for the compound Li3 (PO4) (JCPDS no. 87 - 39).
Chem. 24 (2000) 381-388 [12] Ying Shi, Jingkui Liang, Hao Zhang, Quanlin Liu, Xiaolong Chen, Jinling Yang, Weidong Zhuang, Guanghui Rao, Crystal Structure and Thermal Decomposition Studies of Barium Borophosphate, BaBPO5, J. of Solid State Chemistry 135 (1998) 43-51

The effects of the different crystallization time on the degree of crystallinity, skeleton structure, morphology, size of the particle and its distribution of zeolite 4A samples were investigated using XRD,FT-IR,SEM and Zetasizer.
The results indicated that the zeolite 4A sample featured high crystallinity degree, excellent dispersivity, high purity and single structure.
Herein, we develop a method for the recycling of by-products of polysilicon, zeolite 4A samples were obtained from silicon tetrachloride in high purity, single structure and high crystallinity degree.
Particle size(μm) Wavenumber(cm-1) Fig.3 Particle size distribution curves of the zeolite samples with various synthesis times Fig.4 SEM Micrograph of NaA of different reaction time 4h 6h 15h 10h 12h 8h Influence of reaction time on skeleton structure of zeolite samples FT-IR spectra can be useful in obtaining crucial information about the structure of the tetrahedral sites of zeolite minerals[12,13].Fig.5 compared the IR spectra of the materials formed in various synthesis times.
These samples featured high purity, single structure and excellent crystallinity degree.

It also needs more research in the future. 3.2 Cast structure The cast structure of the sample and AZ91 [6] were shown in Fig.1a and Fig.1b respectively.� The precipitated phase A and inclusion B can be seen from Fig.1a, the α-Mg solid solution and eutectic structure β-Mg17Al12 were shown in Fig.1b.
As the eutectic structure, β-Mg17Al12 phases were distributed on grain boundary.
No eutectic structure β-Mg17Al12 but a little eutectic structure Mg17La2 could be found in the sample.
The growth of Mg17Al12 might be inhibited by the strengthening phase Mg-RE, which can also change the cast structure, refine the grain and increase the strength and elongation percentage.
Mg17La2 eutectic structure was generated and the grain was refined obviously.

Effect of Chlorine Dioxide on Decoloration of Reactive Dye Binsong Wang 1,2,a , Lu Jin1,b， Fuyi Cui 2,c , Jie Zhang 3,d* 1 School of Chemistry and Materials Science，Heilongjiang University，Harbin 150080，China 2School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China 3 School of Life Science ,Northeast Forestry University, Harbin 150040,China a609291321@qq.com b31753110@qq.com c cuifuyi@hit.com d875817856@qq.com e 592943878@qq.com Keywords: Chlorine dioxide; decolorization; dye Abstract: As an important oxidants, Chlorine dioxide was more useful in the decolorization of Reactive Red KE-3B, Reactive Blue KN-R, Reactive Red X-3B and Reactive Blue X-BR.
Experimental Chemicals Reactive Red KE-3B (see Fig.1 for chemical structure), Reactive Blue KN-R(see Fig. 2 for chemical structure),Reactive Red X-3B(see Fig.3 for chemical structure)and Reactive Blue X-BR (see Fig. 4 for chemical structure) industrial grade, ARindustrial grade, was supplied by Beijing Chemical Reagents Ltd..
The deionized water was used in the preparation Fig.1 Chemical structure of Fig.2 Chemical structure of Fig.3 Chemical structure of Fig.4 Chemical structure of Reactive Red X-3B Reactive Blue KN-R Reactive Red KE-3B Reactive Blue XB-R of dye solutions.
The results which is due to the alkalinity or acidity of the reaction system, and structure of the dye show that ClO2 resulted in substantial decoloration of each dye under specified conditions.
Efficacy the color removal rate depend on the structures of various classes of dyes as well as the intermediates formed.

Introduction In recent decades the chemistry of calixarenes has been widely investigated due to their possible application in various fields such as: extraction and separation process of heavy metals, extraction of lanthanides ions from nuclear waste, catalysis, gas adsorption, sensors and luminescent devices [1-6].
It may not be excluded that in the case of structures with Eu3+ and Tb3+, the unreacted starting material (1) is present in the structure as the residual peak at 1742 cm-1 may be visible.
Moreover, additional peaks in (1b) pattern probably assigned to another structure formed during the synthesis may be observed.
These results can indicate the formation of new structures based on lanthanides and the calix[4]arene tetracarboxylic acid
Structural analysis performed by XRD and Infrared spectroscopy indicates that all compounds show the same crystalline structure.

Synthesis and Properties Study of 1-(2,4-dimethoxyl-5-pyrimidinyl)-2-[2-methyl-5-(3-cyano)-3-thieny-l] perfluorocyclopentene Duohua Jiang and Gang Liu* Jiangxi Key Laboratory of Organic Chemistry, Jiangxi Science and Technology Normal University Nanchang 330013, P.R.China liugang0926@163.com Keywords: Diarylethene, Photochromism, Pyrimidine, Fluorescence.
The structure of diarylethene 1o was confirmed by 1H NMR (400 MHz, CDCl3, TMS): δ 2.09 (s, 3H, -CH3), 3.75 (s, 3H, -OCH3), 4.02 (s, 3H, -OCH3), 7.26 (s, 1H, thiophene-H), 7.62 (d, 2H, J = 8.0 Hz, benzene-H), 7.67 (d, 2H, J = 8.0 Hz, benzene-H), 8.33 (s, 1H, pyrimidine-H).
The significant difference in absorption bands of the closed-ring isomers compared to their open-ring isomers is mainly due to the increase in π conjugation, which dramatically changes the electronic structure as a whole in such a way that new electronic transitions are observed in the visible region [10,11].

Potassium sodium niobate(KNN) lead-free piezoelectric ceramics is perovskite structure material, at present were widely research both at home and abroad. it have good piezoelectric properties, and no pollution to the environment, it has small density, acoustic high velocity, high mechanical quality factor, electromechanical coupling coefficient, low dielectric constant and piezoelectric properties, high frequency constant big, etc.
Measurement The fracture structures of film samples were examined on the Quanta 200FEG scanning electron microscope (SEM).
Journal of materials chemistry, 2009, 19(18): 2817-2821

The establishment of mathematical models Considering the need of practical experiments, assumptions are put forward, when the solution mined cavern process wasestablished[4] : (1) Ignore the influence of stratigraphic dip angle, gypsum crystallization direction, stratification and the anisotropyof other micro structure on rock salt dissolution process; (2)During the dissolution process, the cavity shape is axisymmetric structures; (3) All the insolubles impurity precipitate, and neglect the effect on diffusion(4) Regardless of the horizontalheterogeneity of the property distribution of salt rocks; (5) Ignore the influence of the temperature difference, (6) The thick of insoluble substance and interlayers in halite stratum are the same, andits physics and chemistry propertiesare uniformly and stabledistributed.

Sturba 1g 1 Department of Chemistry "Ciamician", University of Bologna, via Selmi 2, 40126 Bologna, Italy 2 Lima Lto Spa, San Daniele, Udine, Italy a adriana.bigi@unibo.it, belisa.boanini@unibo.it, cbracci@ciam.unibo.it, d af@lima.it, e silvia.panzavolta@unibo.it, f frs@lima.it, gluigina@ciam.unibo.it Keywords: biomimetic coating, calcium phosphate, Ti6Al4V, SEM, TEM-ED Abstract.
The amount of deposited material increases on increasing the soaking time (figure 2 b-c), and after 6h of soaking a uniform layer completely hides the etched structure of the substrate (figure 2c).
The deposits are constituted of globular aggregates with mean diameter of about 2 µm, which display a fine lamellar structure (figure 2d).