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Introduction The external nature of materials is determined by its internal structure.
FeS2 belongs to NaCl-type crystal structure, it’s crystal structure is shown in Fig.1.
Generally speaking[1], in the cube-type crystal structure, Fe atom occupies the angle and the center of surfaces, integrates with six sulfur S atoms in the form of octahedral structure.
(4) the impact of structure and defects on the flotation.
References [1] Zhuwen He, Yi Yang.The crystal chemistry of the pyrite-type structure[J].

A sample’s surface profile and structure were represented using SEM and FT-IR.
See Fig.1(a) for the SEM photo of the eigenstate of PANI, which shows lamellar cluster structure in loose arrangement.Fig.1(b)and(c) are the SEM images of PANI/ACF composites, which clearly shows activated carbon fibre penetrating through PANI and forming a conductive path.
Such a structure not only acts as an excellent carrier for PANI and remedies its poor conductivity, but also improves utilization of PANI and increases capacitance of the composite.
This means adding activated carbon fibre has boosted the ratio of the structure of reducting PANI.
A significant increase of N-H stretching vibration peaks at 3490-3400cm-1 was also observed after PANIis compounded with activated carbon fibre, which means the addition of activated carbon fibre has, to some extent, boosted the ratio of the structure of reducting PANI.

However, in situ structuring and interfacial tailoring of IPNs is necessary to obtain desired properties and to overcome challenges such as defects in the fine structure, phase separation and incompatibility.
The structure of IPNs was shown in Scheme1.
It can also be a problem for damage-tolerant largespace structures.
M., High Performance Thermoset, Chemistry, Properties, Application, Hanser, 1993
W., Chemistry and Technology of Cyanate Ester Resins, ed by Hamerton I., Chapman and Hall: Glasgow, Chapter 2, 1994

At the same time, the presence of nanodispersed conductive additives can lead to the structuring of cementitious matrices with an increased density and strength [7].
It was noted that amorphized structures increase the adhesion of crystalline new formations.
"Modern Building Materials, Structures and Techniques" 2017.
Essays on crystal chemistry.
Publishing house "Chemistry", Leningrad Department, 1974.- 496 p

This film can be doped by n-type and p-type elements in its structure.
The lattice parameters of the zinc oxide structures are in Table 1.
The lithium present did not change the wurtzite structure of the zinc oxide; however the Li+ insertion in the ZnO structure vacancies created defects that helped to change the optical properties of the ZnO.
Journal of Physics and Chemistry of Solids 100 (2017) 115–125
Journal of Physics and Chemistry of Solids 139 (2020) 109354

Among them, hydrothermal or solvethermal method is regarded as a very effective and potential soft-chemistry route to tune the architectures of lead selenide.
Weon-kyu Koh et al[11] studied the role of different Se precursors for PbSe nanorod (NR) synthesis, focusing on phosphine chemistry to understand precursor decomposition (Figure 1c).
These seeds then act as catalytic sites where PbSe, formed by decomposition of bis[N,N-diethyl-N′-naphthoylselenourea]lead(II), adsorbs and grows into 1D NW structures.
The observed phenomena in the synthesis of the PbSe/CdSe and PbSe/CdSe/ZnSe core/shell structures were explained through the carrier wave function expansion and the surface polarization.
Prospects Lead selenide nanostructures have novel properties and functions corresponding to their unique structures.

With the development of science and technology, much effort has been devoted to producing BaCO3 with different structures since the morphologies of BaCO3 materials and their properties are closely related [2].
The chemical structure of the ionic liquids (1-butyl-3-methylimidazolium chloride and 1-octyl-3-methylimidazolium bromide), which were purchased from Chinese Academy of Sciences LICP, are schematically shown in Scheme 1.
In this work, we suppose a similar structure of microemulsion was formed when the ionic liquid reached to a certain concentration.
[3] Jiasheng Xu, Dongfeng Xue: Journal of Physics and Chemistry of solids 67 (2006) 1427-1431
[8] Kou Yuan, He Ling: Progress in Chemistry.

Synthesis and Formation Mechanism of Solid and Hollow Alumina Microspheres at the Water-oil Interface Liangmiao Zhang1, a, Ling Han2, b, Hao Zhang3, c, Shanshan Shen4, d, Wencong Lu5, e Department of Chemistry, Shanghai University, Shanghai, China e-mail: lmzhang@mail.shu.edu.cn Keywords-hollow sphere; W/O/W emulsion; Formation Mechanism Abstract—NH4Al(OH)2CO3 (AACH) hollow spheres and solid spheres were successfully synthesized with water in oil in water (W/O/W) emulsion, applying the liquid-to-liquid-phase boundary of the micellar system as a template.
Introduction Recently, morphology-controlled synthesis of the nanoscale building blocks into complex structures have been the focus of significant interests in materials chemistry and device fabrications.
Controlled organization of primary building units into curved structures represents another challenge for materials synthesis as a result of their high potential in new technological applications.
As shown in Fig. 1a, the strong contrast between the dark edge and the relatively bright center is evidence for their hollow structures.
Some nanoflakes have shown the tendency to curl and adhere to the spherical structure.

The DNA molecule, a double-helix structure consisting of two strands, has a diameter of approximately 2 nm, which qualifies it for nanoscale applications [2].
The nano-oxidation of semiconductors by atomic force microscopy (AFM) is emerging as a reliable and versatile lithography method for the fabrication of nanoscale structures and devices [6].
Conclusions A new method is proposed for the selective alignment of DNA molecules and fabrication of silver wire structures along the DNA molecules.
Dervan, Molecular recognition of DNA by small molecules, Bioorganic & Medicinal Chemistry 9 (2001) 2215–2235
Martinez Chem, Nano-chemistry and scanning probe nanolithographies, Soc.

Fig. 1 shows the structure schematic of SPR effect which is known as Kretschmann structure [15], and the prism hypotenuse side is coated with a layer of metal film with thickness d, where ε1, ε2, ε3 represent dielectric constant of prism, metal film and air, respectively.
(1) Fig. 1 Structure schematic of SPR effect According to the Fresnel formula, the reflection coefficient [17] of the thin film system shown in Fig. 1 can be described as the Eq. 2,
[4] Bienkowski Krzysztof, Strawski Marcin, Szklarczyk Marek, The determination of the thickness of electrodeposited polymeric films by AFM and electrochemical techniques, Journal of Electroanalytical Chemistry, 662 (2011) 196-203
[5] Stadnichenko AI, Sorokin AM, Boronin AI, XPS, UPS, and STM studies of nanostructured CuO films, Journal of Structural Chemistry, 49 (2008) 341-347
[8] Tsai WH, Lin YC, Tai JK, et al, Multi-step structure of side-polished fiber sensor to enhance SPR effect, Optics and Laser Technology, 42 (2010) 453-456