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Among them, the brookite structure is rare and the other two kinds are more common.
And the rutile form is the best crystal structure at photocatalytic degradation.
Then they make the surface present rough nano structures by heat treatment.
[3].Guan Dongsheng，Fang Haitao，Preparation and Doping of Anodic TiO2 Nanotube Array[J],Progressin Chemistry，2008，1868-1879
[4].Kong Xiangrong，Peng Peng，Research Advances in TiO2 Nanotub es, Chemistry Online，2007，8-13 [5].Zhang Xiaojun，Wang Jinhua，Preparation and Application of TiO2 Nanotube Array，Chemical Reagents,2013，641-644

As shown in Fig. 3(a~d), the obvious changes of surface structure can be found by comparing the cross-section views of SiNWs.
Hence, the porous structure on the sidewalls of nanowires can be modulated by adjusting the size, amount, and distribution of Ag NPs.
A single crystalline structure of SiNWs can be obtained under the appropriate etching condition.
Am: Chemistry of Materials, Vol. 50 (2011) No.26, p.5947
Lieber: Chemistry of Materials, Vol.33 (2011) No. 23, p.2457

The structure parameters and properties of sintered honeycombs were obtained by measuring and calculating.
Some of these applications include transportation, aerospace, environment protect, new power, mechanical chemistry, electronics and construction.
Before sintering After sintering 10mm Fig.1 The structure of extruded and sintered honeycombs Structure parameters of sintered samples.
The structure parameters and physical properties of sintered honeycombs were obtained by measuring and calculating. the structure parameters and physical properties of sintered honeycombs sintered at 1150℃ for 30min are showed in Table 2 and Table 3.
Lee, Metal Honeycomb from Oxide paste: Maraging Steel and Super Invar structure and properties, In: Processing and Properties of Lightweight Cellular Metals and Structures, edited by A.Ghosh,T.Sanders,D.Claar, TMS，2002, p.116 [9] Y.

Enamels are different from glass in chemical composition, structure and properties, especially in their softening point temperature and surface structure.
Crystal structure of the hydrophobic film.
The normal enamel surfaces consist of -Si-O-H group and -Si-O-Na group structures.
These kinds of structures have the hydrophilic properties and the contact angles are 23°.
Luo: ‘Interface Chemistry’, Chemical Industry Press, Beijing 2005, p.37

CuInGaSe2 (CIGS) is the family of semiconducting materials of the tetragonal chalcopyrite structure; it has emerged as a leading material for high efficiency and radiation-hard solar cell application.
However, the effects of heat treatment temperature and Ga content in raw materials on the structure, morphology and properties of particles are not well studied.
In sample b, 200 nm to 500 nm particles gathered into the10 to 20 mm group structure.
Samples c and d have similar structure; the size of particles is 200 nm to 1 mm and particles showed good dispersion. 50nm thick sheet structure formed petal-like ball structure with the size of 15mm, and there is 15mm smooth tetrahedral structure in sample e.
Samples h and i also have similar structure, the size of particles is 200 nm to 1 mm most particles have small size.50nm thick sheet structure formed petal-like ball structure with the size of 10mm in sample j.

Modal testing is essential to correct the structure of dynamics model and optimize structure designs.
Introduction The aim of modal testing is to test the dynamic characteristic of structures, including the natural frequency of structures, damping, generalized rigidity and so on.
The test results are used in obtaining or validating dynamic design of structures, the failure diagnosis and so on.
The basic principle and structure of the modal testing suspension system The suspension system is constituted by two parallel subsystems: the pneumatic subsystem and the electromagnetism subsystem.
Foret: Analytical Chemistry,Vol.71(1999), pp.3258-3264.

They produce homogeneous structured systems, the constituent components of which have higher electrochemical characteristics [13].
The research also studies their phase composition, structure, and electrochemical properties.
The high specific capacity value of this composite oxide material is due to subsequent reversible lithium insertion into the substrate structure.
Whittingham, Crystal structure of cobalt molybdate hydrate CoMoO4·nH2O, Jounal of Solid State Chemistry. 178 (2005) 2791–2797
The use of transient electrolysis in the technology of oxide composite nanostructured materials: review, Nanosystems: Physics, Chemistry, Mathematics. 3 (2016) 433–450

The novel network structure consisting of nanowires has been shaped and overlapped towards certain direction.
The formation of this network structure reveals that PANI molecules have been successfully inserted into the interlayer of MMT.
In particular, it can be shown that a novel network structure consisting of nanowires has been shaped and the network is overlapped towards certain direction.
The formation of this structure indicates that PANI molecules have been successfully inserted into the interlayer of MMT.
Conclusion In summary, PANI/MMT/La 3+ nanocomposites with a novel network structure were successfully prepared by an in-situ intercalation/polymerization.

Correlation equations allow calculating the manganese distribution between the ferromanganese inclusions and slag phases by chemical analysis data only, without microscopic analysis of the structure.
Typical slag structure is shown in Fig. 2.
Correlation equations allow calculating the manganese distribution between the ferromanganese inclusions and slag phases by chemical analysis data only, without microscopic analysis of the structure.
Trusov, TERRA system software for the simulation of phase and chemical equilibria at high temperatures, in Proceedings of the third international symposium (The burning and plasma chemistry), Kazakhstan university, Almaty, (2005) 52-57
Lykasov, Thermodynamic characteristic calculations for oxide melts by complete thermodynamic modeling, Russian Journal of Physical Chemistry, 80(11) (2006) 1773-1775

A monoclinic crystal structure was found using X-ray diffractometry (XRD), which was confirmed to be consistent with JCPDS card No. (89-5899).
Introduction Nanotechnology is a broad field of study that uses tiny particles in chemistry, biology, medicine, and material science, among other scientific disciplines. 
The size of the nanoparticles and the monoclinic crystal phase structure of the CuO thin films were both associated with the notable improvement in the prepared thin films.
Kelly, 2005, The structure and properties of copper oxide and copper aluminium oxide coatings prepared by pulsed magnetron sputtering of powder targets, Vacuum, 79, 3–4, 221-230
Influence of thermal annealing on microstructural, morphological, optical properties and surface electronic structure of copper oxide thin films, Materials Chemistry and Physics, 147, 987-995