The Role of Alum in the Fabrication of Calcium Silicate for Dissolved Acetylene Cylinders

2011 ◽  
Vol 117-119 ◽  
pp. 870-872
Author(s):  
Shi Cai Cui ◽  
Zhao Bo Meng
Keyword(s):  
Phase Composition ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Powder Diffraction ◽  
Calcium Silicate ◽  
Filling Material ◽  
X Ray ◽  
Comprehensive Performance ◽  
Scanning Electron

Calcium silicate for filling material used in dissolved acetylene cylinders was prepared by adding alum as additive. Samples were characterized by X-ray powder diffraction (XRD) and scanning electron microscope (SEM). The effects of alum on the bleeding, shrinkage, strength, porosity, morphology and phase composition were studied. The experimental results show that the adding of alum can improve the comprehensive performance of samples. The mechanism was discussed in detail.

scholarly journals The influence of metahalloysite addition on tobermorite formation studied by X-ray powder diffraction and scanning electron microscope

2018 ◽  
Vol 163 ◽  
pp. 05008
Author(s):  
Anna Skawińska
Keyword(s):  
Phase Composition ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Hydrothermal Treatment ◽  
Powder Diffraction ◽  
Quartz Sand ◽  
Raw Material ◽  
Model Systems ◽  
X Ray ◽  
Scanning Electron

This paper presents the results of the studies carried out in the model systems and concerning the tobermorite synthesis with an addition of metahalloysite. Quartz sand and quicklime were the main raw material constituents. The mixtures in the form of slurries underwent hydrothermal treatment with an addition of metahalloysite (5%, 10%, 15%, 20% and 30%) for 4 hours and 12 hours. The resultant composites were analysed for their phase composition using X-ray powder diffraction. The microstructure was examined using the Scanning Electron Microscope. Tobermorite was the principle reaction product. When 30% metahalloysite was added to the mixture containing CaO and SiO2, the formation of katoite was found.

scholarly journals The Role of Aragonite in Producing the Microstructural Diversity of Serpulid Skeletons

Minerals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1435
Author(s):  
Olev Vinn
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Powder Diffraction ◽  
Deep Ocean ◽  
X Ray ◽  
Prismatic Structure ◽  
Wide Range ◽  
Different Types ◽  
Scanning Electron

Aragonite plays an important role in the biomineralization of serpulid polychaetes. Aragonitic structures are present in a wide range of serpulid species, but they mostly belong to one clade. Aragonitic structures are present in a wide range of marine environments, including the deep ocean. Aragonitic tube microstructures were studied using a scanning electron microscope. X-ray powder diffraction was used to identify the aragonite. Aragonite is used to build five different types of microstructures in serpulid tubes. The most common aragonitic irregularly oriented prismatic structure (AIOP) is also, evolutionarily, the most primitive. Some aragonitic microstructures, such as the spherulitic prismatic (SPHP) structure, have likely evolved from the AIOP structure. Aragonitic microstructures in serpulids are far less numerous than calcitic microstructures, and they lack the complexity of advanced calcitic microstructures. The reason why aragonitic microstructures have remained less evolvable than calcitic microstructures is currently unknown, considering their fit with the current aragonite sea conditions (Paleogene–recent).

scholarly journals Facile and Surfactant-Free Synthesis of Hierarchical ZnO Microstructures

2015 ◽  
Vol 19 (2) ◽  
pp. 17
Author(s):  
Kezhen Qi ◽  
Ruidan Wang ◽  
Jiaqi Fu ◽  
Ke Chen ◽  
Chunying Zuo
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Powder Diffraction ◽  
Growth Mechanism ◽  
Hydrothermal Route ◽  
X Ray ◽  
Reaction Solution ◽  
Facile Hydrothermal Route ◽  
Scanning Electron

Hierarchical ZnO crystals with flower-like microstructures were successfully synthesized via a facile hydrothermal route without using any surfactants. The morphology of these microstructures can be easily controlled by adjusting the pH of the reaction solution. The products were characterized by X-ray powder diffraction (XRD) and scanning electron microscope (SEM). Furthermore, a possible growth mechanism of ZnO hierarchical microstructures was proposed.  

scholarly journals Hybrid Ag2O/ZnO Heterostructures

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Jing Wang ◽  
Yang Liu ◽  
Yang Jiao ◽  
Fengyu Qu ◽  
Qingzhi Pan ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Powder Diffraction ◽  
Growth Mechanism ◽  
Spectroscopy Analysis ◽  
X Ray ◽  
Transmission Electron ◽  
Step Procedure ◽  
Intrinsic Emission ◽  
Scanning Electron

The well-aligned Ag2O/ZnO microflowers heterostructure was synthesized by a straightforward two-step procedure. The diameters of the as-synthesized products were as much as 1.5 μm. The as-grown Ag2O/ZnO heterostructure was investigated by X-ray powder diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), and photoluminescence (PL) spectroscopy analysis. A possible growth mechanism for flowerlike Ag2O/ZnO heterostructure was proposed based on the experimental results. Compared with pure ZnO microflowers, PL spectrum of the composite with only one strong peak at 383 nm showed good intrinsic emission.

Direct growth of Mn0.6Ni0.4CO3 nanosheet assembles on Ni foam for high-performance supercapacitor electrodes

2022 ◽  
Author(s):  
RongMin Cheng ◽  
Conghong Zhan ◽  
Juanjuan Gao
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Powder Diffraction ◽  
High Performance ◽  
Ni Foam ◽  
X Ray ◽  
Transmission Electron ◽  
Direct Growth ◽  
Calcination Treatment ◽  
Scanning Electron

Using Ni foam as a template, Mn0.6Ni0.4CO3 nanosheet assembles were synthesized by hydrothermal method and calcination treatment. X-ray powder diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), Inductively...

The Impact of Lithium Polysilicate on the Microstructure of Sand-Lime Products

2011 ◽  
Vol 250-253 ◽  
pp. 718-721 ◽  
Author(s):  
Ryszard Dachowski ◽  
Zdzislawa Owsiak
Keyword(s):  
Compressive Strength ◽  
Phase Composition ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Calcium Silicate ◽  
The Impact ◽  
Scanning Electron

The general attributes of calcium silicate products have been investigated in several studies. In this paper, we propose to use a specific modifier i.e. lithium polysilicate solution in order to examine and improve compressive strength of sand-lime bricks. The research was examined by scanning electron microscope (SEM). The main objective was to determine the phase composition in the structure of the sand-lime products.

Gas-phase Hg0 Removal by a Fe2O3/AC Catalyst

2012 ◽  
Vol 518-523 ◽  
pp. 210-213
Author(s):  
Jun Wei Wang ◽  
Rui Qing Liu ◽  
Xue Jun Kong
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Gas Phase ◽  
Elemental Mercury ◽  
Oxidation Activity ◽  
X Ray ◽  
Edx Analysis ◽  
Activated Coke ◽  
Scanning Electron

Gas-phase elemental mercury (Hg0) removal by an activated coke (AC) supported Fe2O3 catalyst (Fe2O3/AC) was studied under N2+HCl atmosphere and compared with that by AC. The influences of Fe2O3 loading, temperature and inlet Hg0 concentration on Hg0 removal were investigated. The results indicate that the Hg0 removal capability of Fe2O3/AC was much higher than that of AC, indicating the important role of Fe2O3 oxidation activity. The capability of Fe2O3/AC increased with an increase of Fe2O3 loading (1-10 wt.%) and temperature (120-200 °C). Scanning electron microscope-energy dispersive X-ray (SEM-EDX) analysis confirmed the correlation between Fe2O3 and Hg adsorbed over Fe2O3/AC.

scholarly journals Fe-Al Phosphate Microcrystals in Pedogenic Goethite Pisoliths

Minerals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 357
Author(s):  
János Kovács ◽  
Éva Farics ◽  
Péter Szabó ◽  
István Sajó
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Fluorescence Spectroscopy ◽  
Powder Diffraction ◽  
Sedimentary Rocks ◽  
Depositional Environments ◽  
Substantial Contribution ◽  
Subtropical Climate ◽  
X Ray ◽  
Scanning Electron

In sedimentary rocks, Fe-Al phosphate minerals occur in different rocks and depositional environments. Herein, we present microcrystals of wavellite, crandallite, and cacoxenite from pedogenic goethite pisoliths and nodules. Pisoliths and nodules are generally dominated by Fe oxides and oxihydroxides. Frequently, pisoliths and nodules demonstrate high phosphatization and a substantial contribution of allogenic detritus. The aim of our study is to present these remarkable crystals found in goethites. We describe the geochemistry and mineralogy of the pisoliths and try to interpret the possible paragenesis of the minerals. Loose ferruginous pisoliths and nodules are separated from the red paleosol and analyzed using field emission scanning electron microscope (FE-SEM) coupled with the energy dispersive X-ray detector (EDS), X-ray fluorescence spectroscopy (XRF), and X-ray powder diffraction (XRD) methods. The studied paleosols are weathered in a subtropical climate and the newly formed precipitation products, such as crandallite, wavellite, cacoxenite, and goethite, accumulate during the weathering of apatite.

Study on the Phase Composition and Particle Size of Boron Mud

2014 ◽  
Vol 881-883 ◽  
pp. 1568-1571
Author(s):  
Zhi Qiang Ning ◽  
Ling Ling Zhang
Keyword(s):  
Particle Size ◽  
Phase Composition ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
X Ray ◽  
Laser Particle Size Analyzer ◽  
Particle Size Analyzer ◽  
Boron Mud ◽  
Scanning Electron

The phase composition and particle size of the boron mud is investigated by X-ray diffractometry (XRD), scanning electron microscope (SEM) and laser particle size analyzer. The mainly phase composition of the boron mud are magnesite (MgCO3) and forsterite (Mg2SiO4). The mainly phase composition of the calcined boron mud are forsterite (Mg2SiO4) and a small amount magnesia (MgO). the sizes of the boron mud are about 2~6μm and a few of them are bigger and less than 10μm and the particle size of less than 10μm is about 60%.

The Impact of Barium Aggregate on the Microstructure of Sand-Lime Products

2011 ◽  
Vol 250-253 ◽  
pp. 618-621 ◽  
Author(s):  
Ryszard Dachowski ◽  
Anna Stępień
Keyword(s):  
Experimental Study ◽  
Phase Composition ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Calcium Silicate ◽  
Raw Materials ◽  
The Impact ◽  
Scanning Electron ◽  
Materials Preparation

This paper presents an experimental study on sand-lime bricks. The purpose of this research is to examine different materials as modifiers, in particular barium aggregate. Undoubtedly, the properties of the sand-lime products depend on many factors such as raw materials, preparation or autoclaving conditions, etc. The research was carried out and analyzed by scanning electron microscope (SEM) in order to improve acoustic isolation of calcium silicate bricks. As a result, it was possible to determine the phase composition in the structure of the calcium silicate products.

Sign in / Sign up

Export Citation Format

Share Document