scholarly journals Comparative investigation of the influence of kaolin and dolomite on the properties of polyurethane foam

2021 ◽  
Vol 8 ◽  
pp. 27
Author(s):  
Joseph Ajibade Omotoyinbo ◽  
Isiaka Oluwole Oladele ◽  
Jamiu Mosebolatan Jabar ◽  
Joseph Olatunde Borode ◽  
Kenneth Kanayo Alaneme ◽  
...  
Keyword(s):  
Polyurethane Foam ◽  
System Approach ◽  
Chemical Properties ◽  
Comparative Investigation ◽  
Vibration Band ◽  
The Matrix ◽  
Stretching Vibration ◽  
Sulfonic Acid Groups ◽  
Polyurethane Matrix ◽  
And Chemical Properties

This work investigates the influence of kaolin and dolomite on the properties of polyurethane foam. The selected fillers were pulverized and sieved to obtained < 90 μm that were used as reinforcements in the polyurethane matrix in a randomly dispersed mode. The matrix constituents were mixed in the same ratio while fillers were introduced via a one-shot system approach in predetermined proportions of 3–7 wt.%. The work was carried out to identify optimum fillers to be utilized in the production of polyurethane rigid foams given the effect of the fillers on the physical, mechanical, and chemical properties of the foam. FTIR, XRF, and SEM and mechanical property tests were carried out on the filled polyurethane foam. The presence of the fillers in the foam showed a rupture in the structure of the foams with the cells having similar arrangements. The addition of dolomite and Kaolin degrades the sulfonic acid groups and promoted the appearance of Si–O stretching vibration band. The density, hardness, flexural and compressive strengths of the polyurethane foam were enhanced with the the addition of dolomite and kaolin particles.

The microstructure of a TiB2/Ti-47 Al composite material

1989 ◽  
Vol 47 ◽  
pp. 674-675
Author(s):  
O. Popoola ◽  
A.H. Heuer ◽  
P. Pirouz
Keyword(s):  
Composite Material ◽  
Ion Beam ◽  
Chemical Properties ◽  
Intermetallic Alloys ◽  
Transmission Electron ◽  
Diamond Polishing ◽  
Al Composite ◽  
The Matrix ◽  
Argon Ion ◽  
And Chemical Properties

The addition of fibres or particles (TiB2, SiC etc.) into TiAl intermetallic alloys could increase their toughness without compromising their good high temperature mechanical and chemical properties. This paper briefly discribes the microstructure developed by a TiAl/TiB2 composite material fabricated with the XD™ process and forged at 960°C.The specimens for transmission electron microscopy (TEM) were prepared in the usual way (i.e. diamond polishing and argon ion beam thinning) and examined on a JEOL 4000EX for microstucture and on a Philips 400T equipped with a SiLi detector for microanalyses.The matrix was predominantly γ (TiAl with L10 structure) and α2(TisAl with DO 19 structure) phases with various morphologies shown in figure 1.

scholarly journals Effect of TiO2 Concentration on Thermal Stability and Dielectric Properties of (PANI)1-x(TiO2)x Nanocomposites

2019 ◽  
Vol 31 (4) ◽  
pp. 855-859
Author(s):  
Ajay Kumar Sharma ◽  
Praveen Kumar Jain ◽  
Rishi Vyas ◽  
Vipin Kumar Jain
Keyword(s):  
Thermal Stability ◽  
Dielectric Properties ◽  
Optoelectronic Devices ◽  
Chemical Properties ◽  
Rutile Phase ◽  
Sem Images ◽  
Xrd Pattern ◽  
The Matrix ◽  
Structural Surface ◽  
And Chemical Properties

The current paper deals with investigation of (PANI)1-x(TiO2)x nanocomposites to explore possible material for optoelectronic devices. To investigate the effect of TiO2 concentration on structural, surface morphology and chemical properties of PANI, samples were characterized by XRD, FTIR, SEM and Raman spectroscopy. The XRD pattern evidence the presence of a blend of anatase and rutile phase of TiO2 within the PANI matrix which shows amorphous nature of the matrix. FTIR and Raman spectra confirm the formation of PANI/TiO2 nanocomposites. SEM images show the appearance of lumps into smooth PANI samples with addition of TiO2 nanoparticles. The thermal and dielectric properties were studied using TGA and Impedance analyzer, respectively. The results showed that the addition of TiO2 improves the thermal stability, which clearly shows its potential application in optoelectronic devices.

Matrix degradation regulates osteoblast protrusion dynamics and individual migration

2019 ◽  
Vol 11 (11) ◽  
pp. 404-413
Author(s):  
Nieves Movilla ◽  
Clara Valero ◽  
Carlos Borau ◽  
Jose Manuel García-Aznar
Keyword(s):  
Chemical Properties ◽  
Matrix Metalloproteinase Inhibitor ◽  
Surrounding Environment ◽  
Cell Velocity ◽  
The Matrix ◽  
3D Matrix ◽  
A Cell ◽  
Degradation Activity ◽  
Good Agreement ◽  
And Chemical Properties

Abstract Protrusions are one of the structures that cells use to sense their surrounding environment in a probing and exploratory manner as well as to communicate with other cells. In particular, osteoblasts embedded within a 3D matrix tend to originate a large number of protrusions compared to other type of cells. In this work, we study the role that mechanochemical properties of the extracellular matrix (ECM) play on the dynamics of these protrusions, namely, the regulation of the size and number of emanating structures. In addition, we also determine how the dynamics of the protrusions may lead the 3D movement of the osteoblasts. Significant differences were found in protrusion size and cell velocity, when degradation activity due to metalloproteases was blocked by means of an artificial broad-spectrum matrix metalloproteinase inhibitor, whereas stiffening of the matrix by introducing transglutaminase crosslinking, only induced slight changes in both protrusion size and cell velocity, suggesting that the ability of cells to create a path through the matrix is more critical than the matrix mechanical properties themselves. To confirm this, we developed a cell migration computational model in 3D including both the mechanical and chemical properties of the ECM as well as the protrusion mechanics, obtaining good agreement with experimental results.

Influence of P2O5 and Al2O3 on Mineral Formation in Converter Slag

2013 ◽  
Vol 477-478 ◽  
pp. 1273-1277
Author(s):  
Zhi Hao Deng
Keyword(s):  
Converter Slag ◽  
Chemical Properties ◽  
Dicalcium Silicate ◽  
Cement Industry ◽  
Physical And Chemical Properties ◽  
Mineral Formation ◽  
The Matrix ◽  
Complex Chemical Composition ◽  
Physical And Chemical ◽  
And Chemical Properties

Converter Slag is a by-product during steelmaking. Reusing the slag as Portland cement material can be regarded as a way to reduce environmental pollution. However, the poor grindability caused by complex chemical composition of the slag makes it very difficult to be used in cement industry. To better understand its grindability, the mineral characteristic of converter slag was investigated in this paper. Experimetal slags of CaO-MgO-SiO2-Fe2O3, CaO-MgO-SiO2-Fe2O3-P2O5 and CaO-MgO-SiO2- Fe2O3-P2O5-Al2O3 were synthetized according to physical and chemical properties of actual converter slag. The mineral structures of these slags were analyzed by SEM and EDS. The results show that actual and synthetic slags have mainly three mineral, where dicalcium silicate with little phosphorus presented dark gray, periclase presented black and the matrix phase of dicalcium ferrite. Moreover, phosphorus largely dissolves in the 2CaO∙SiO2 in the form of 3CaO∙PO4, and the other minerals don’t contain phosphorus. A Little aluminum has a little influence on the mineral formation of the slag.

Experimental Investigation on Compression and Chemical Properties of Aluminium Nano Composite

2014 ◽  
Vol 680 ◽  
pp. 7-10 ◽  
Author(s):  
B. Vijaya Ramnath ◽  
Chakravarthi Parswajinan ◽  
C. Elanchezhian ◽  
S. Venkatesan Pragadeesh ◽  
C. Kavin ◽  
...  
Keyword(s):  
Metal Matrix ◽  
Chemical Properties ◽  
Pure Aluminium ◽  
Matrix Composites ◽  
Powder Metallurgy Technique ◽  
Nano Composite ◽  
Eutectic Particles ◽  
The Matrix ◽  
Aluminium Metal ◽  
And Chemical Properties

Aluminium metal matrix composites are being widely investigated with Carbon Nanotubes (CNTs) as one of their reinforcing agents. This is done in order to improve the mechanical strength of the composite. Various studies on this concept have already been recorded. In this study, Aluminium has been reinforced with CNTs using powder metallurgy technique. The powders of aluminium and CNT are ball milled, compacted in a die made up of die steel, and then sintered. The specimens thus obtained were subjected to hardness, compression and chemical tests and the values were compared with pure aluminium specimen fabricated by same technique. The study indicated that there was no improvement in hardness of the composite on addition of CNT. The compressive strength of the composite was increased by 143.58 MPa. The microstructure of pure aluminium and Al-CNT composite had fine grains of pure aluminium particles and Al-Si eutectic particles throughout the matrix phase.

Using the Waste of Polyester and Glass Fiber in Cold Recycling Highways Superstructure

2017 ◽  
Vol 21 ◽  
pp. 309-316
Author(s):  
Mihai Liviu Dragomir ◽  
Andrei Florin Clitan ◽  
Nicolaie Pop
Keyword(s):  
Chemical Properties ◽  
Physical And Mechanical Properties ◽  
Polyester Fiber ◽  
Highway Infrastructure ◽  
Recycling Technology ◽  
The Matrix ◽  
Cold Recycling ◽  
Short Time ◽  
Alternative Solutions ◽  
And Chemical Properties

This paper wish to make a presentation of the possibility to use glass and polyester fiber waste in making highway cold recycling better, easier and cheaper. For this purpose we have studied the influence of the fibers (glass and polyester) on some experimental sectors, from our country, Sălaj district, Transylvania. Glass and polyester fiber waste can be used like disperse reinforcing materials in highway superstructures in so called cold recycling technology. The fibers are throughput in the matrix for better physical and mechanical properties of the final product. This technique will give better highway surface, cheaper costs per rehabilitated kilometer and diminution of the waste that some industries are making.Most studies from this scientific sector are gravening above the realization of brand new superstructures ignoring the possibility to recycling the existing layers with or without other materials in addition. The period that we are passing is one characterized by intense preoccupations oriented on the economically aspect, much more over the big investments like are highways and bridges - were the cheaper solution is the winner.There are some problems in spreading and dosage of the fibers in the system to ensure the reinforcing function. For the recycled complex (aggregates, bitumen, cement, water and fibers) we will use the generically denomination of matrix. The improvement of physical, mechanical and chemical properties of the matrix constitutes problems that are hard to solve in a very short time. Regarding the fibers the biggest problem is the dosage and homogenization in the structure. To attend this purpose fiber need to have the correct length ant the correct spread in the matrix.We had make a bibliography documentation, that encourage us to believe that using some alternative solutions will obtain very good results also in our country, that have the well-known problems regarding its highway infrastructure.

Variability within a saprolite deposit near Quebec City, Canada

1985 ◽  
Vol 22 (5) ◽  
pp. 781-785 ◽  
Author(s):  
Christian De Kimpe ◽  
Chang Wang ◽  
Marc Laverdière ◽  
Pierre LaSalle
Keyword(s):  
Spatial Distribution ◽  
Spatial Variability ◽  
Chemical Properties ◽  
Quebec City ◽  
Chemical Analyses ◽  
Mineral Assemblages ◽  
The Matrix ◽  
Points Of View ◽  
Good Agreement ◽  
And Chemical Properties

Samples were collected in two trenches opened in a saprolite developed in a mylonite derived from biotite–garnet gneiss near Quebec City in order to investigate the spatial variability from the points of view of morphological, physical, mineralogical, and chemical properties. Phyllosilicate assemblages were: (a) kaolinite, (b) mica, (c) kaolinite + mica, and (d) mica + interstratified minerals (+ smectite). Grouping of the samples according to prominent colour in the matrix showed a relation between chroma and kaolinite content. Total chemical analyses were in good agreement with mineral assemblages. The spatial distribution of these assemblages corresponded to the degree of transformation of the gneiss into mylonite.

Statistical criteria of stellar population types

1966 ◽  
Vol 24 ◽  
pp. 101-110
Author(s):  
W. Iwanowska
Keyword(s):  
Stellar Population ◽  
Chemical Properties ◽  
Spectrophotometric Study ◽  
Physical And Chemical Properties ◽  
Population Type ◽  
The Galaxy ◽  
Distribution Parameters ◽  
Physical And Chemical ◽  
Statistical Criteria ◽  
And Chemical Properties

In connection with the spectrophotometric study of population-type characteristics of various kinds of stars, a statistical analysis of kinematical and distribution parameters of the same stars is performed at the Toruń Observatory. This has a twofold purpose: first, to provide a practical guide in selecting stars for observing programmes, second, to contribute to the understanding of relations existing between the physical and chemical properties of stars and their kinematics and distribution in the Galaxy.

Tailoring microstructures of materials through biomimetics

1993 ◽  
Vol 51 ◽  
pp. 500-501
Author(s):  
Mehmet Sarikaya ◽  
Ilhan A. Aksay
Keyword(s):  
Chemical Properties ◽  
Design And Synthesis ◽  
Structure Sensitive ◽  
Macro Scale ◽  
Methods Of Synthesis ◽  
Successive Level ◽  
Engineering Materials ◽  
Physical And Chemical ◽  
And Chemical Properties ◽  
Synthesis Of Materials

Biomimetics involves investigation of structure, function, and methods of synthesis of biological composite materials. The goal is to apply this information to the design and synthesis of materials for engineering applications.Properties of engineering materials are structure sensitive through the whole spectrum of dimensions from nanometer to macro scale. The goal in designing and processing of technological materials, therefore, is to control microstructural evolution at each of these dimensions so as to achieve predictable physical and chemical properties. Control at each successive level of dimension, however, is a major challenge as is the retention of integrity between successive levels. Engineering materials are rarely fabricated to achieve more than a few of the desired properties and the synthesis techniques usually involve high temperature or low pressure conditions that are energy inefficient and environmentally damaging.In contrast to human-made materials, organisms synthesize composites whose intricate structures are more controlled at each scale and hierarchical order.

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