Effect of the specific surface area of nano-silica particle on the properties of cement paste

2021 ◽  
Author(s):  
Shuai Bai ◽  
Xinchun Guan ◽  
Hui Li ◽  
Jinping Ou
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Cement Paste ◽  
Silica Particle ◽  
Nano Silica

Concept of Full Surface at Syntesis and Application of Silica Nanopowder

2014 ◽  
Vol 9 (4) ◽  
pp. 80-88
Author(s):  
Alexey Zavialov ◽  
Konstantin Zobov ◽  
Vyacheslav Syzrantsev ◽  
Sergey Bardakhanov
Keyword(s):  
Electron Beam ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Theoretical Models ◽  
Electron Beam Evaporation ◽  
Synthesis Process ◽  
Nano Silica ◽  
Silica Nanopowder ◽  
Main Factor

The paper describes a model of synthesis and analysis of the application of nano-silica obtained by electron beam evaporation. The authors developed the approach that shows of the specific and fully surfaces of nanopowders to have more significance then the size of the nanoparticles. The experimental results and theoretical models supporting this concept are presented. In particular, the connection between the strength of the epoxy and the total surface value dispersed into epoxy is shown. In the synthesis of large quantities of nanopowder we can use the model concepts to predict specific surface directly from the averaged parameters of synthesis. The main factor for a used synthesis scheme is presented: the multiplication a product of mass performance on specific surface area. The combination of this factor with the model representations of specific surface evaluation allows to estimate the quality and efficiency of the synthesis process. The nanopowder total surface versatility as a criterion of comparability of different modes, and possibly synthesis processes is shown

Structural Adjustment of In-Situ Surface-Modified Silica Matting Agent and Its Effect on Coating Performance

NANO ◽  
2018 ◽  
Vol 13 (12) ◽  
pp. 1850137 ◽  
Author(s):  
Qingna Xu ◽  
Tongchao Ji ◽  
Qingfeng Tian ◽  
Yuhang Su ◽  
Liyong Niu ◽  
...  
Keyword(s):  
Particle Size ◽  
Liquid Phase ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Pore Volume ◽  
Silica Particle ◽  
Phase Method ◽  
Extinction Rate

A series of silica surface-capped with hexamethyldisilazane (denoted as H-SiO2) were prepared by liquid-phase in-situ surface-modification method. The as-obtained H-SiO2 was incorporated into acrylic amino (AA) baking paint to obtain AA/H-SiO2 composite extinction paints and/or coatings. N2 adsorption–desorption tests were conducted to determine the specific surface area as well as pore size and pore volume of H-SiO2. Moreover, the effects of H-SiO2 matting agents on the physical properties of AA paint as well as the gloss and transmittance of AA-based composite extinction coatings were investigated. Results show that H-SiO2 matting agents possess a large specific surface area and pore volume than previously reported silica obtained by liquid-phase method. Besides, they have better dispersibility in AA baking paint than the unmodified silica. Particularly, H-SiO2 with a silica particle size of 6.7[Formula: see text][Formula: see text]m and the dosage of 4% (mass fraction) provides an extinction rate of 95.2% and a transmittance of 79.3% for the AA-based composite extinction coating, showing advantages over OK520, a conventional silica matting agent. Along with the increase in the silica particle size, H-SiO2 matting agents cause a certain degree of increase in the viscosity of AA paint as well as a noticeable decrease in the gloss of the AA-based composite extinction coating, but they have insignificant effects on the hardness and adhesion to substrate of the AA-based composite coatings. This means that H-SiO2 matting agents could be well applicable to preparing low-viscosity and low-gloss AA-based matte coatings.

scholarly journals Nano-silica added to Portland cement

2021 ◽  
Vol 43 ◽  
pp. e51699
Author(s):  
Thiago Melanda Mendes ◽  
Wellington Longuini Repette
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Gas Adsorption ◽  
Mechanical Performance ◽  
Raw Materials ◽  
Microstructural Analysis ◽  
Silica Content ◽  
X Ray Diffraction ◽  
Nano Silica

For a controlled particle size distribution, nano-silica was added to three different cements. The chemical and mineralogical compositions of the cements were characterized by fluorescence and X-ray diffraction. The granulometric distributions of cements and nano-silicas were obtained by laser granulometry and dynamic lightning scattering. The specific surface area of the raw materials was determined by gas adsorption. The effect of nano-silica and type of cement on rheological behavior was evaluated by rotational rheometry. The mechanical performance was investigated through the compression strength. The microstructural analysis was performed by scanning electron microscopy. The water demand and the consumption of dispersant increases according to the nano-silica content. The reduction in the inter-particle separation, and the agglomeration of nano-silica led to an increase in the viscosity of the suspension. The mechanical performance was directly affected by the specific surface area of the cements. Microstructural analysis showed that nano-silica changed from a layered adsorbed structure, to a porous or agglomerated structure.

scholarly journals Compressive Strength of Concrete with Nano Cement

2021 ◽  
Author(s):  
Jemimah Carmichael Milton ◽  
Prince Arulraj Gnanaraj
Keyword(s):  
Compressive Strength ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Cement Paste ◽  
Cement Mortar ◽  
Setting Time ◽  
Replacement Level ◽  
Initial Setting Time ◽  
Initial Setting

Nano technology plays a very vital role in all the areas of research. The incorporation of nano materials in concrete offers many advantages and improves the workability, the strength and durability properties of concrete. In this study an attempt has been made to carry out an experimental investigation on concrete in which cement was replaced with nano sized cement. Ordinary Portland cement of 53 grade was ground in a ball grinding mill to produce nano cement. The characterization of nano cement was studied using Scanning Electron Microscope (SEM), Brunauer Emmett–Teller (BET), Energy Dispersive X ray microanalysis (EDAX) and Fourier Transform Infrared Spectroscopy (FTIR). From the characterization studies, it was confirmed that particles were converted to nano size, the specific surface area increased and the chemical composition remained almost the same. The properties of cement paste with and without nano cement were found. For the experimental study, cement was replaced with 10%, 20%, 30%, 40% and 50% of nano cement. Cement mortar of ratio 1:3 and concrete of grades M20, M30, M40 and M50 were used. Compressive strength of cement mortar and concrete with different percentages of nano cement was found. The cement mortar was also subjected to micro structural study. It was found that the strength increased even up to the replacement level of 50%. Further increase in the replacement is not possible since the addition of nano cement reduces the initial and final setting time of cement paste. At 50% replacement level, the initial setting time got reduced to 30 minutes which the least permitted value as per IS 12269: 2013. The increase in strength was due to the fact that nano cement acts not only as a filler material but also the reactivity increased due to the higher specific surface area. The SEM image shows the formation of additional C-S-H gel. The percentage increase in compressive strength was found to increase up to 32%. The workability of concrete with nano cement was found to be significantly more than that of the normal cement concrete.

A Convenient Strategy to Control the Specific Surface Area of the Mesoporous Silica by Using the Poly(pseudo)rotaxanes Template

2012 ◽  
Vol 602-604 ◽  
pp. 1685-1688
Author(s):  
Lei Zu ◽  
Yu Yuan Zhi ◽  
Kai Gu ◽  
Hui Qin Lian ◽  
Xiu Guo Cui
Keyword(s):  
Mesoporous Silica ◽  
Specific Surface ◽  
Pore Size ◽  
Surface Area ◽  
Specific Surface Area ◽  
Fourier Transformation ◽  
Silica Particle ◽  
N2 Adsorption ◽  
Adsorption Desorption ◽  
Mesoporous Silica Particle

The poly(pseudo)rotaxanes formed by β-CD and F127 was used as the template to prepare the mesoporous silica. The specific surface area, pore size distribution and pore volume of the mesoporous silica could be controlled by simply changing the poly(pseudo)rotaxanes forming time. A series of samples with different template forming time were prepared to investigate the various specific surface area and pore size of the mesoporous silica. The morphology, composition, specific surface area and pore size of the mesoporous silica particle were investigated by the scanning electron microscopy, Fourier transformation infrared spectroscope, and N2 adsorption–desorption measurement.

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