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Synthesis and optical properties of some novel bis-1,3,4-oxadiazoles Hua Liua, Lu Linb, Dun-Jia Wang*c Hubei Collaborative Innovation Center for Rare Metal Chemistry, Hubei Key Laboratory of Pollutant Analysis and Reuse Technology, Hubei Normal University, Huangshi 435002, China a407568495@qq.com, b835937271@qq.com, cdunjiawang@163.com (Corresponding author) Keywords: 2,6-bis(1,3,4-oxadiazol-2-yl) pyridine, fluorescence, quantum yield Abstract.
Three bis-1,3,4-oxadiazole derivatives were synthesized and their structures were confirmed by 1H NMR, FTIR, MS techniques and elemental analysis.
Compounds a-c displayed similar absorptions ranging from 278 to 302 nm, which are attributed to π-π* transition of conjugated structures.
The structures of title compounds were confirmed by IR, 1H NMR, MS techniques and elemental analysis.

The structure of the copolymer particles was characterized by the Fourier transform infrared spectroscope (FT-IR).
The structure of the polymer particles was characterized by the Fourier transform infrared spectroscope (FT-IR).
The structure of the polymer particles was characterized by the Nicolet 6700 Fourier transform infrared spectroscope (FT-IR).
Huang, Synthesis and characterization of a new copolymer of acrylamide, methyl acrylate and 2-acrylamido-2-methyl-propanesulfonic acid, Chinese Journal of Synthetic Chemistry. 3(1995) 231-234

With the development of manufacturing technology of filament-wound structures, there has been a growing interest in the application of the FW fiber-reinforced cylindrical composite structures[3, 4].
However, composite structures are highly prone to impact damage and other kind of However, damage detection and life prediction of these multi-layered composite structures are extremely complicated due to the existence of different material interfaces.
But the insert of the SMART layers with PZT reduced the strength of the structure and may introduce new defects.
Though guided wave is also widely used in nondestructive testing for thin plate or shell structures [6, 7], it is not suitable for the damage detection of thick-wall structures and layered composites.
Shen, A filament-wound structure technology overview Materials Chemistry and Physics, 42 (1995) 96-100

Investigation of crystal structure was characterized using XRD instrument.
The peak of Fe3O4 and Mn0.3Fe2.7O4 is indicative of a cubic spinel structure with an Fd3m space group [21].
In this study, the aim of adding the PEO/PMMA has been used to control the stabilization of particle size and control the design of the crystal structure still on the octahedral structure [23].
Meanwhile, adding PEO/PMMA in this research was used to control the stabilization of particle size and control the design of the crystal structure still on the octahedral structure.
Rajeh, “Influence of Fe3O4 nanoparticles on the optical, magnetic and electrical properties of PMMA/PEO composites: Combined FT-IR/DFT for electrochemical applications,” Journal of Organometallic Chemistry, vol. 920, p. 121348, Aug. 2020, doi: 10.1016/j.jorganchem.2020.121348

Preparation and Optical Property of ZnS:Mn/XO2 (X=Ti, Si) Nanoparticles with Core/shell Structure Yulong Wanga, Wentao Zhangb*, Jianping Long and Peicong Zhang College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu 610059, China awyl19124@sina.com, bzhangwentao2005@163.com Keywords: ZnS:Mn2+, Silica coating, Titanium dioxide coating, Luminescence.
Results and Discussion Structure and properties of ZnS and ZnS:Mn2+ nanoparticles.
All the samples were analyzed by XRD in order to detect the element and crystal structure of samples.
Structure and properties of TiO2-coated ZnS:Mn2+ nanoparticles.
Structure and properties of SiO2-coated ZnS:Mn2+ nanoparticles.

A Simple New Way to Prepare Cu-Doped Nano-TiO2 with Visible Light Photocatalytic Activity Maolin Zhang a, Longfeng Li b, Xiangdong Meng c School of Chemistry and Materials Science, Huaibei Normal University, Huaibei 235000, China amlzhang1268@163.com, bcorresponding author. lfli9469@163.com, cmxd8484@163.com Keywords: Titanium Dioxide, Copper Doping, Nanoparticle, Photocatalysis.
The phase structure, composition and morphology of the product were characterized by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray energy dispersive spectroscopy (EDS) and Brunauer-Emmett-Teller surface area analysis (BET).
Heating the autoclave up to 150 ℃ and holding it for 10 hrs at this temperature, the amorphous precursor was transformed into the Cu-doped nano-TiO2 with stable crystal structure.
A Bruker D8 X-ray diffractometer with Cu Kα radiation(λ= 0.15418 nm), the accelerating voltage of 40 kV, emission current of 40 mA and the scanning speed of 8°/min were used to determine the phase structures and the crystallite size of the product Cu-doped TiO2.
The crystal structure, composition and size of the synthesized samples were characterized by XRD, SEM-EDS and BET techniques.

Clinoptilolite that is in zeolitic structure resembles to pumice due to alumina silicate formations in its constitution.
With alumina silicate formations Clinoptilolite in zeolitic structure, resembles to pumice [6-7].
Also it may be due to hard ceramic structures homogeneously dispersed in the polymer forming the bis-acryl composite structure
Borchers et. al declared that presence of filler particles, size distribution of the particles, and the composition of the resin matrix or the inherent chemistry of the materials may influence polishability [16-17].
Our opinion is that, biocompatibility of clinoptilolite and its performance in polishing of polymeric structures combined with future studies will enable it to be used as a safer material.

The crystal structure confirmed the maghemite form of iron oxide.
Rao, Transition Metal Oxides: Crystal Chemistry, phase Transition and Related Aspects, Nat.
Toth, The chemistry of contrast agents in medical magnetic resonance imaging; Wiley (2001) 1-489
Rotello, Monolayer exchange chemistry of γ-Fe2O3 nanoparticles, Chem.
Toth, The chemistry of contrast agents in medical magnetic resonance imaging, Wiley (2001) 1-489

Wide opportunities of mechanochemistry as the chemistry of nonthermal low-temperature reactions illustrates the fact that refractory materials and intermetallics, inorganic and organic compounds, molecular complexes, composite materials, modified polymers and pharmaceutical preparations were synthesized in the solid phase without dissolving or melting of the reactants.
MA is carried out at a relatively low temperature when the formation of a perfect crystal structure is difficult.
Fig. 6 shows the evolution of the particle structure of the Fe - 18 % Cr - 8 % Ni - 12 % Mn powder during the MA process.
With increasing the MA duration time the layers size decreases and the nanocrystalline structure is formed.
Fig. 5.The layered structure of the powder particles in the Ag - Cu system obtained by MA [6] Fig. 6.

There is no obvious other diffraction peak corresponding to the ternary boride structure for sample d (600℃).
These peaks are usually present in nearly stoichiometric AlMgB14 structure[13],but they are absent in the film.
Fig.3 show strong diffractions at around 13.89°,but the peak is wider indicating amorphous structures.
This peak, which does not correspond to the AlMgB14 structure, suggests new phase formation at this sputtering power.
Mehrotra.Journal of Organometallic Chemistry.