scholarly journals High-strength fluoroanhydrite composition

2019 ◽  
Author(s):  
Grigory Yakovlev ◽  
Jadvyga Keriene ◽  
Valery Grakhov ◽  
Rostislav Drochytka ◽  
Anastasiya Gordina ◽  
...  
Keyword(s):  
Water Resistance ◽  
Raw Materials ◽  
Waste Product ◽  
High Strength ◽  
Structure And Properties ◽  
X Ray ◽  
Physico Chemical ◽  
Gypsum Plaster ◽  
Chemical Studies ◽  
Increased Strength

The research studies the properties of a high-strength anhydrite composition based on fluoroanhydrite, a waste product of hydrofluoric acid. To activate fluoranhydrite, Na3PO4 sodium phosphate was added to the composition in an amount of 3% of the mass. The physico-chemical studies of the structure and properties of activated fluoroanhydrite conducted using infrared spectroscopy and X-ray phase analysis showed changes in the composition of the hardened composite, and the study of the fluoroanhydrite microstructure revealed the formation of a denser matrix with the increased strength. An increase in the water resistance of the developed binder matrix was noted. The composition can be used as a cheap substitute for gypsum plaster due to the low prime cost of raw materials, and also contribute to the improvement of the environmental situation in fluoroanhydrite disposal sites.

scholarly journals Enhanced Water Resistance of Recycled Newspaper/High Density Polyethylene Composite Laminates via Hydrophobic Modification of Newspaper Laminas

Polymers ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 421
Author(s):  
Binwei Zheng ◽  
Weiwei Zhang ◽  
Litao Guan ◽  
Jin Gu ◽  
Dengyun Tu ◽  
...  
Keyword(s):  
Stearic Acid ◽  
Photoelectron Spectroscopy ◽  
Composite Laminates ◽  
High Density Polyethylene ◽  
Water Resistance ◽  
Laminated Composite ◽  
High Strength ◽  
High Water ◽  
High Density ◽  
X Ray

A high strength recycled newspaper (NP)/high density polyethylene (HDPE) laminated composite was developed using NP laminas as reinforcement and HDPE film as matrix. Herein, NP fiber was modified with stearic acid (SA) to enhance the water resistance of the NP laminas and NP/HDPE composite. The effects of heat treatment and SA concentration on the water resistance and tensile property of NP and composite samples were investigated. The chemical structure of the NP was characterized with X-ray diffractometer, X-ray photoelectron spectroscopy and attenuated total reflectance Fourier transform infrared spectra techniques. The surface and microstructure of the NP sheets were observed by scanning electron microscopy. An expected high-water resistance of NP sheets was achieved due to a chemical bonding that low surface energy SA were grafted onto the modified NP fibers. Results showed that the hydrophobicity of NP increased with increasing the stearic acid concentration. The water resistance of the composite laminates was depended on the hydrophobicity of the NP sheets. The lowest value of 2 h water absorption rate (3.3% ± 0.3%) and thickness swelling rate (2.2% ± 0.4%) of composite were obtained when the SA concentration was 0.15 M. In addition, the introduction of SA can not only enhance the water resistance of the composite laminates, but also reduce the loss of tensile strength in wet conditions, which shows potential in outdoor applications.

scholarly journals Preparation of basalt-based glass ceramics

2003 ◽  
Vol 68 (6) ◽  
pp. 505-510 ◽  
Author(s):  
Branko Matovic ◽  
Snezana Boskovic ◽  
Mihovil Logar
Keyword(s):  
Optical Microscopy ◽  
Phase Analysis ◽  
Glass Ceramic ◽  
Glassy Phase ◽  
Raw Materials ◽  
Glass Ceramics ◽  
High Strength ◽  
Ceramic Materials ◽  
X Ray ◽  
Glass Ceramic Materials

Local and conventional raw materials?massive basalt from the Vrelo locality on Kopaonik mountain?have been used as starting materials to test their suitability for the production of glass-ceramics. Crystallization phenomena of glasses of the fused basalt rocks were studied by X-ray phase analysis optical microscopy and other techniques. Various heat treatments were used and their influences, on controlling the microstructures and properties of the products were studied with the aim of developing high strength glass-ceramic materials. Diopside CaMg(SiO3)2 and hypersthene ((Mg,Fe)SiO3) were identifies as the crystalline phases. The final products contained considerable amounts of a glassy phase. The crystalline size was in range of 8?480 ?m with plate or needle shape. Microhardness, crashing strength and wears resistence of the glass-ceramics ranged from 6.5?7.5, from 2000?6300 kg/cm2 and from 0.1?0.2 g/cm, respectively.

scholarly journals Carbon Nanosorbent for Purification Different Biomolecules

2011 ◽  
Vol 14 (1) ◽  
pp. 41
Author(s):  
Z.A. Mansurov ◽  
A.R. Kerimkulova ◽  
S.A. Ibragimova ◽  
E.Y. Gukenheimer
Keyword(s):  
Carbon Nanostructures ◽  
Large Scale ◽  
Carbon Materials ◽  
Raw Materials ◽  
Carbon Sorbent ◽  
Nanostructured Carbon ◽  
Lipid Complex ◽  
Carbon Sorbents ◽  
Physico Chemical ◽  
Chemical Studies

The article presents the results of physico-chemical studies on the development of nanostructured carbon materials from domestic raw materials. Were obtained and tested micro-mesoporous carbon sorbents for molecular-sieve chromatography of markers and investigated the applicability of carbon sorbents for the separation of protein-lipid complex, and plant bio-stimulator. Carbon sorbents have well-developed porous structure but their disadvantage is the weak mechanical<br />strength. Recently it was shown that some carbon nanostructures have enormous strength. Thus arose the need to give the nano structured elements to carbon sorbent. Creating carbon sorbents containing nanocarbon structure was the aim of our study, as these by sorbents will be very useful for large-scale purification of biomolecules.

Use of Aluminum-Containing Technogenic Raw Materials for Obtaining High-Strength Earthquake-Resistant Bricks Based on Low-Melting Clay of the Aktobe Region

2020 ◽  
Vol 24 (11) ◽  
pp. 14-18
Author(s):  
A.K. Kairakbaev ◽  
V.Z. Abdrakhimov ◽  
E.S. Abdrakhimova
Keyword(s):  
Frost Resistance ◽  
Raw Materials ◽  
High Strength ◽  
Ceramic Brick ◽  
Spent Catalyst ◽  
High Rise ◽  
Earthquake Resistant ◽  
Increased Strength ◽  
Technogenic Raw Materials ◽  
Absolute Advantage

The use of nanotechnogenic petrochemical raw materials-spent IM-2201 catalyst containing more than 70 % Al2O3, and as a clay binder-lowmelting clay from the Ilek Deposit in the Aktobe region allows you to get a ceramic brick that corresponds to the M150 brand. It is possible to build load-bearing walls of the lower floors of high-rise buildings (more than 10 floors) from M150 ceramic bricks. Innovative proposals for the use of waste from production and spent catalyst in the production of ceramic high-strength earthquake-resistant bricks with increased strength and frost resistance have been developed. The absolute advantage of using multi-tonnage waste and spent catalyst IM-2201 is to relieve the environmental situation.

Synthesis and Properties of Polypropylene Carbonate Polyol-Based Waterborne Polyurethane

2014 ◽  
Vol 936 ◽  
pp. 58-62 ◽  
Author(s):  
Cheng Shu Xu ◽  
Cheng Cheng Tian ◽  
Wei Dong Zhang ◽  
Jian Wei Xing ◽  
Zai Sheng Cai ◽  
...  
Keyword(s):  
Water Resistance ◽  
Soft Segment ◽  
Waterborne Polyurethane ◽  
Infrared Spectrometry ◽  
Structure And Properties ◽  
X Ray Diffraction ◽  
Fourier Transform Infrared Spectrometry ◽  
X Ray ◽  
Polyhydric Alcohols ◽  
Ft Ir

Different kinds of anionic polyhydric alcohols water-borne polyurethane (WPU) emulsion and films were prepared by separately taking polypropylene carbonate polyol (PPC), polyethylene-1,4-buthylene adipate glycol (PBA) and polytetramethylene ether glycol (PTMG) with the same molecular weight as soft segment. Their structure and properties were characterized with Fourier transform infrared spectrometry (FT-IR), X-ray diffraction (XRD), rigidity, adhesive power, contact angle and water absorption. Comparing their properties, it was found that the rigidity, adhesive power and water resistance of PPC WPU were similar to those of PBA WPU.

scholarly journals PHYSICO-CHEMICAL PROPERTIES OF A COMPOSITE MATERIAL BASED ON CALCIUM HYDROPHOSPHATE AND A SUBSTRATE FROM ASPEN BARK

2020 ◽  
pp. 357-364
Author(s):  
Mikhail Yur'yevich Belash ◽  
Irina Vladimirovna Korol'kova ◽  
Yevgeniya Vladimirovna Veprikova ◽  
Galina Nikolayevna Bondarenko ◽  
Irina Vladimirovna Korol'kova ◽  
...  
Keyword(s):  
Composite Material ◽  
Water Resistance ◽  
Catalytic Effect ◽  
Substrate Surface ◽  
Chemical Properties ◽  
Analysis Data ◽  
X Ray ◽  
Physico Chemical ◽  
Mineral Components ◽  
Initial Content

The physicochemical properties of the composite material obtained by sequentially impregnating the substrate from aspen bark with water solutions of KH2PO4 and CaCl2 under certain conditions were studied. Using the method of X-ray phase analysis, it was found that the main products of the interaction of KH2PO4 and CaCl2, which flows from the aspen bark on the substrate surface, are CaHPO4 and KCl. In this case, calcium chloride is present in the obtained composite material in the form of a complex compound CaCl2·Ca(OH)2·H2O. Using IR-spectral analysis, it was revealed that there is no interaction between the functional groups of the aspen bark substrate and mineral compounds during the preparation of the composite material. Based on thermal analysis data, the catalytic effect of the mineral components that make up the developed composite material on the decomposition of hemicellulose, cellulose and lignin that make up the substrate from aspen bark is revealed. It was found that the composite material modified with CaHPO4 is characterized by increased water resistance and after treatment with water at room temperature for 24 hours, 9.85% of phosphates are removed from it (from their initial content). This allows one to use the resulting composite material based on aspen bark as a delayed-action fertilizer.

Effect of Deformation, Annealing and Doping with Zr on Nb Filaments Nanocrystalline Structure in High-Strength In Situ Cu-Nb Composites

2006 ◽  
Vol 258-260 ◽  
pp. 299-304 ◽  
Author(s):  
E.N. Popova ◽  
Vladimir V. Popov ◽  
E.P. Romanov ◽  
N.E. Hlebova ◽  
V.I. Pantsyrny ◽  
...  
Keyword(s):  
Mechanical Testing ◽  
Nanocrystalline Structure ◽  
High Strength ◽  
Structure And Properties ◽  
Dispersion Strengthening ◽  
X Ray ◽  
Fibre Texture ◽  
Two Component

The structure and properties of in situ Cu-Nb composites have been studied by the methods of TEM and SEM, X-ray analysis and mechanical testing. The evolution of Nb filaments structure at drawing and the effect of annealing and doping with Zr on the composites structure and texture have been investigated. Sharp fibre texture with <110>Nb develops in the ribbon-shaped Nb filaments, while the Cu matrix possesses a two-component fibre texture, <111>Cu and <100>Cu, appreciably affected by annealing. Annealing results in softening due to Nb filaments coagulation. In Zr doped composites two types of ZrO2 particles are observed, dispersed and coarse ones. The former result in the dispersion strengthening, while the latter may cause embrittlement.

scholarly journals ENGINEERING AND RESEARCH OF WEARABILITY COATING ON THE BASIS OF HIGH-STRENGTH STEEL

2017 ◽  
Author(s):  
G. Tsvetkova ◽  
M. Skotnikova
Keyword(s):  
Wear Resistance ◽  
High Strength Steel ◽  
High Strength ◽  
Optical Metallography ◽  
Structure And Properties ◽  
X Ray ◽  
Relative Wear Resistance ◽  
Strengthening Phases ◽  
Facing Material ◽  
Martensite Structure

Methods of the optical metallography, TEM, SEM- technique, X-ray analysis, tests for hardness and wear resistance, are resulted results of research and optimization of structure and properties facing materials with austenite-martensite structure and with various quantity of strengthening phases. The maintenance in facing material austenite 38% is shown, that, martensite 32% and strengthening phases of 30% provide the highest relative wear resistance  = 5.89 and hardness HRC 61.

Mesoporous Nano Carbon Sorbents for Separating Different Biomolecules

2012 ◽  
Vol 535-537 ◽  
pp. 284-288 ◽  
Author(s):  
Almagul R. Kerimkulova ◽  
Seitkhan Azat ◽  
Zulkhair A. Mansurov ◽  
Murat K. Gilmanov ◽  
S.A. Ibragimova ◽  
...  
Keyword(s):  
Molecular Sieve ◽  
Mesoporous Carbon ◽  
Carbon Materials ◽  
Raw Materials ◽  
Nanostructured Carbon ◽  
Lipid Complex ◽  
Carbon Sorbents ◽  
Physico Chemical ◽  
Chemical Studies ◽  
Nano Carbon

The article presents the results of physico-chemical studies on the development of nanostructured carbon materials from domestic raw materials. Were obtained and tested micro-mesoporous carbon sorbents for molecular-sieve chromatography of markers and investigated the applicability of carbon sorbents for the separation of protein-lipid complex, and plant bio-stimulator.

Low-cost biodiesel production using waste oil and catalyst

2020 ◽  
pp. 0734242X2093517
Author(s):  
Raheleh Talavari ◽  
Shokoufe Hosseini ◽  
GR Moradi
Keyword(s):  
Electron Microscopy ◽  
Fossil Fuels ◽  
Building Materials ◽  
Raw Materials ◽  
Low Cost ◽  
High Strength ◽  
Biodiesel Production ◽  
Molar Ratio ◽  
Waste Frying Oil ◽  
X Ray

With the production of renewable biofuels, concerns about the end of fossil fuels have been partially eliminated. On the other hand, the utilization of low-cost and waste materials to provide the raw essential substances to manufacture these fuels is of paramount importance. Biodiesel is one of these fuels and the required raw materials for the reaction are oil (triglycerides), alcohol and catalyst. In this work, travertine stone powder (as waste in the manufacture of building materials) was used as a catalyst and waste frying oil as a source of triglyceride for biodiesel production. Using thermogravimetric and X-ray diffraction analysis, optimum temperature for catalyst calcination was selected at 900°C. Furthermore, X-ray fluorescence, Fourier transform infrared spectroscopy, Brunauer–Emmett–Teller, transmission electron microscopy and scanning electron microscopy analyses were performed. Using the design of experiments Response Surface Methodology, the optimum reaction conditions for biodiesel production yield of 97.74% were: reaction temperature 59.52°C (~60°C), time 3.8 h (228 min), catalyst concentration 1.36 wt.% and the methanol to oil molar ratio of 11:6. After reusing four times, the catalyst efficiency was reduced a little, and the biodiesel yield was 89.84%, indicating high strength and stability of the catalyst.

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