scholarly journals Effect of Metallisation of Basalt Fabric on Its Surface Resistivity

2021 ◽  
Vol 29 (1(145)) ◽  
pp. 41-46
Author(s):  
Pamela Miśkiewicz ◽  
Magdalena Tokarska ◽  
Iwona Frydrych ◽  
Wojciech Pawlak
Keyword(s):  
Surface Modification ◽  
Thermal Properties ◽  
Electron Microscope ◽  
Work Environment ◽  
Surface Resistance ◽  
Radiant Heat ◽  
Scanning Electron Microscope Analysis ◽  
Electron Microscope Analysis ◽  
Fabric Surface ◽  
Scanning Electron

The main aim of the research was to carry out the surface modification of basalt fabric in order to improve selected thermal properties of the material, i.e., resistance to contact and radiant heat, to apply it in a hot work environment. Attention was focused on checking whether the metal coating deposited does not cause too high conductivity, which is dangerous to human health. The process of magnetron sputtering with the use of chromium and aluminum of various thickness values was applied to basalt fabrics. Based on scanning electron microscope analysis, it was found that none of the aluminum or chromium coatings covered 100% of the basalt fabric surface. Results of the surface resistance analysis of four out of the six samples of basalt fabrics tested indicate that they belong to anti-static materials. The metallic coatings obtained can potentially be used to improve the thermal properties of basalt fabric mentioned.

scholarly journals Effect of laser irradiance on the surface morphology and laser induced plasma parameters of zinc

2014 ◽  
Vol 32 (1) ◽  
pp. 119-128 ◽  
Author(s):  
Mahreen Akram ◽  
Shazia Bashir ◽  
Asma Hayat ◽  
Khaliq Mahmood ◽  
Riaz Ahmad ◽  
...  
Keyword(s):  
Surface Modification ◽  
Electron Microscope ◽  
Laser Induced Breakdown Spectroscopy ◽  
Laser Irradiance ◽  
Plasma Parameters ◽  
Scanning Electron Microscope Analysis ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown ◽  
Electron Microscope Analysis ◽  
Scanning Electron

AbstractThe effect of laser-irradiance on the surface morphology and laser induced breakdown spectroscopy of zinc has been investigated by employing Nd:YAG laser (wavelength λ = 1064 nm, pulse duration t ~ 10 ns, and repetition rate = 10 Hz) under ambient environment of argon at a pressure of 20 Torr. For this purpose, zinc targets were exposed to various laser irradiances ranging from 13 GW/cm2 to 100 GW/cm2. Scanning electron microscope analysis has been performed to analyze the surface modification of irradiated zinc targets. Scanning electron microscope analysis revealed the formation of various kinds of structures such as ripples, cones, cavities, and wave like ridges at the center and peripheral regions of ablated zinc. In the central ablated region with increasing laser irradiance, the growth of distinct and well defined ripples is observed. Further increase in irradiance makes the appearance of these ripples diffusive and narrow. In order to correlate the plasma parameters with the surface modification, laser induced breakdown spectroscopy analysis has also been performed. The electron temperature and number density of zinc plasma have been evaluated at various laser irradiances. For both plasma parameters, an increasing trend up to a certain value of laser irradiance is observed which is due to enhanced energy deposition. Afterword a decreasing trend is achieved which is attributed to the shielding effect. With further increase in irradiance a saturation stage comes and almost no change in plasma parameters is observed. This saturation is explainable on the basis of the formation of a self-regulating regime near the target surface. A strong correlation between surface modification and plasma parameters is established.

Polymorphic Changes of Calcite Carbonate Sediment in Aqueous Solution

2012 ◽  
Vol 549 ◽  
pp. 113-117
Author(s):  
Jian Xin Chen ◽  
Quan Sun ◽  
Teng Jiao Liu ◽  
Joachim Ulrich ◽  
Lei Xie
Keyword(s):  
Aqueous Solution ◽  
Electron Microscope ◽  
X Ray Diffraction ◽  
Carbonate Sediment ◽  
Scanning Electron Microscope Analysis ◽  
X Ray ◽  
Industry Applications ◽  
Electron Microscope Analysis ◽  
Higher Temperature ◽  
Scanning Electron

Calcium carbonate (CaCO3) is abundant in nature, and is also an important material applied in industry as pigment, filler material, etc. It is a challenge to control the desired CaCO3 properties for industry applications. In this study, three typical morphologies of CaCO3, calcite, aragonite and vaterite were prepared. The crystallization temperature and addition of acrylic-acrylate-sulfosalt copolymer play a significant effect on the polymorph change of CaCO3 sediment. Higher temperature promoted the formation of aragonite, while more additives tended to form the vaterite. The x-ray diffraction and scanning electron microscope analysis confirmed the formation of CaCO3 with various polymorphs.

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