scholarly journals A Comprehensive Study on the Effect of ZnO and ZnAl2O4 Nanoparticles on the Mechanical Properties of Epoxy Coating: Tensile and Hardness

2021 ◽  
Vol 15 (5) ◽  
pp. 45
Author(s):  
Abeer Shmait ◽  
Nour El Ghouch ◽  
J. Al Boukhari ◽  
A. M. Abdel-Gaber ◽  
R. Awad
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Fourier Transform Infrared Spectroscopy ◽  
Fourier Transform Infrared ◽  
Tensile Tests ◽  
Precipitation Method ◽  
Zno Nps ◽  
Co Precipitation

ZnO and ZnAl2O4 nanoparticles (NPs) were successfully prepared by the co-precipitation method and characterized by x-ray powder diffraction, transmission electron microscopy, and Fourier transform infrared spectroscopy. The prepared NPs were incorporated into epoxy (EP) coating with mass ratios 200  800 mg/kg of ZnO NPs/EP and ZnAl2O4 NPs /EP. The prepared coatings were characterized by scanning electron microscopy and Fourier transform infrared spectroscopy, and their mechanical properties were investigated, at room temperature, after 5, 10, 15, and 20 days of preparation. Tensile tests showed an improvement in the tensile properties, with the best improvement in ultimate tensile strength (93.2%) for 800 mg/kg ZnAl2O4 NPs/EP coating after 15 days of preparation. The ZnO NPs/EP and ZnAl2O4 NPs/EP coatings exhibited noticeable sensitivity to the stretching rate. Vickers microhardness (Hv) investigations showed normal indentation size effect behavior for all the samples. The best improvement in Hv was attained after 5 days of preparation, for all coatings, with the best improvement (9.15%) for 700 mg/kg ZnO NPs/EP.

The Study of Zinc Doped in Chitosan-Hydrxyapatite Composite

2014 ◽  
Vol 926-930 ◽  
pp. 383-386
Author(s):  
Yan Xiong Yang
Keyword(s):  
Aqueous Solution ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Fourier Transform Infrared Spectroscopy ◽  
Fourier Transform Infrared ◽  
Langmuir Model ◽  
Precipitation Method ◽  
X Ray ◽  
Co Precipitation ◽  
Chitosan Composite

In this paper, Zn-hydroxyapatite/chitosan composite was synthesized via a co-precipitation method. Fourier Transform infrared spectroscopy (FTIR) and X-ray analyzer (EDXA) were used to investigate the microstructure of composite. Then, it was used for removal of Co ions from synthetic aqueous solution. The results indicated that the prepared Zn-hydroxyapatite/chitosan was successful prepared and the adsorption pattern fitted well with Langmuir model.

Preparation of Chitosan - Hydroxyapatite Nanocomposites

2011 ◽  
Vol 284-286 ◽  
pp. 1760-1763
Author(s):  
Jing Xian Zhang ◽  
Dong Liang Jiang ◽  
Qing Ling Lin ◽  
Zhong Ming Chen ◽  
Zheng Ren Huang
Keyword(s):  
Mechanical Properties ◽  
Fourier Transform ◽  
Phase Composition ◽  
Fourier Transform Infrared ◽  
Chitosan Solution ◽  
Precipitation Method ◽  
Solution Ph ◽  
Cylindrical Form ◽  
Infrared Spectrometer ◽  
Co Precipitation

Chitosan/Hydroxyapatite composites with a homogeneous nanostructure have been prepared by a co-precipitation method. Initially, a chitosan solution was prepared and mixed with the (NH4)2HPO4 solution. After homogenizing, the obtained chitosan/ (NH4)2HPO4 solution was gradually dropped into the Ca (NO3)2.4H2O solution under stirring. The solution pH was adjusted to 9 using NH3.H2O. The precipitate was compressed into a cylindrical form followed by post treatment. The microstructure, phase composition and mechanical properties of the resulting chitosan-HAp composites were characterized. In the presence of chitosan, HAp crystallites were found to be well aligned along the c-axes in the respective aggregates. Fourier transform infrared spectrometer results indicated that an intermolecular bridging complexes might have been developed between the chitosan and HAp. The compact composites obtained were mechanically flexible, the highest strength was found to be 38.4 MPa for chitosan/HAp samples with a 20 wt% of chitosan.

Study on Preparation and Properties of Starch and 4-Phenolsuflonate Graft Copolymer with HRP Catalysis

2010 ◽  
Vol 129-131 ◽  
pp. 837-841 ◽  
Author(s):  
Sheng Hua Lv ◽  
Yan Fen Ma ◽  
Rui Gong ◽  
Xiao Liang Yan ◽  
Ming Ming Hou
Keyword(s):  
Mechanical Properties ◽  
Nuclear Magnetic Resonance ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Magnetic Resonance ◽  
Horseradish Peroxidase ◽  
Fourier Transform Infrared Spectroscopy ◽  
Graft Copolymer ◽  
Fourier Transform Infrared ◽  
Structure And Properties

Degraded starch was reacted with 4-phenolsuflonate (PHS) in water in the presence of horseradish peroxidase (HRP) catalyst/H2O2/acetylacetone (ACAC) to give starch and PHS graft copolymers. The structure and properties of the graft copolymer are characterized by Fourier Transform Infrared spectroscopy (FTIR), Nuclear　Magnetic　Resonance (NMR). The retanned leather exhibits excellent increased thickness and softness, good dyeing ability and eligible mechanical properties.

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