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The purpose of this paper is to investigate and determine the effect of colloidal silica with a particle size of 10 nm (with 2%, 3%, and 4% replacement) on high …
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Nano-silica is one of the most used nano-materials, and its use is rising 5.6 per cent per year to reach a projected 2.8 million metric tons in 2016.
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AbstractThe effect of mixing time on hardness, disintegration time and ejection force in tablettlng of magnesium stearate and lactose granules was studied. The hardness of the tablets decreased with an increase in mixing time of the blends, as previously reported. A semilogarithmic plot of the hardness versus mixing time gave a straight line having a …
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A synthetic method for the fabrication of colloidal mesoporous silica nanoparticles of a tunable mesopore size is presented. These nanoparticles form stable colloidal suspensions, have narrow particle size distributions in the 50–300 nm range and exhibit a framework-confined porosity made up of large mesopores with a diameter of up …
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This is caused by the absorption of silica colloidal particles with negative charge on the surface of alumina particles. Sol-dispersed alumina slurry shows a minimum in sedimentation volume and ...
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5.2.3. Use. Chrystalline Silica. Sand and gravel are used for road building and concrete construction ().In the United States, an estimated 44% of construction sand and gravel is used for concrete aggregates; the remainder is used for road base and coverings and road stabilization (25%), asphaltic concrete aggregates and other bituminous mixtures (13%), …
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The purpose of this paper is to investigate and determine the effect of colloidal silica with a particle size of 10 nm (with 2%, 3%, and 4% replacement) on high-performance shotcrete from a rheological and mechanical perspective. In addition, to compare these indicators, silica fume is used with a 4% and 7% mixing rate.
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A modified preparation of silica nanoparticles via sol–gel process was described. The ability to control the particle size and distribution was found highly dependent on mixing modes of the reactants and drying techniques. The mixture of tetraethoxysilane and ethanol followed by addition of water (Mode-A) produced …
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The dissolved silica in the activating solutions was in two forms, as sodium silicate (SS) and in the form of colloidal nano-silica (NS). Colloidal nano-silica (NS) dispersed in water (Average particle size: 5–7 nm, pH: 10.30). The composition of the NS was 25% SiO 2 and 75% H 2 O.
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The fresh samples were prepared to replicate 2009 sample conditions by mixing poorly graded concrete sand, colloidal silica (5%–9% concentration), and NaCl accelerator (0.3N–0.45N). Additionally, scanning electron microscopy tests were performed to support result interpretation and monitor microstructural changes over time.
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Therefore, colloidal silica may greatly influence the CAC cement hydration process and phases. Mostafa [ 1 ] found that the addition of silica fume to CAC cement prevented the strength loss of castables because the conversion reactions from CAH 10 to C 28 and C 36 were prevented, and Son [ 18 ] found similar results using nano …
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DOI: 10.1016/J.CEMCONCOMP.2015.08.002 Corpus ID: 135684874; Influence of colloidal silica sol on fresh properties of cement paste as compared to nano-silica powder with agglomerates in micron-scale
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The present work addresses the effect of incorporation of colloidal Nano-Silica on the behavior of concrete containing recycled coarse aggregate. In this study, concrete mixes containing both natural and recycled aggregate are produced by replacing a fraction of Portland cement 0.75%, 1.5% and 3% of colloidal Nano-Silica …
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DOI: 10.1016/0378-5173(79)90074-7 Corpus ID: 97417430; The influence of mixing time and colloidal silica on the lubricating properties of magnesium stearate …
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Today, LUDOX® colloidal silica is used in applications ranging from a high temperature binder for the production of aerospace parts to a fining agent used to produce beer and wine. LUDOX® functions in commercial applications in three major ways; as a binder, surface modifier, and flocculant. Binder Applications LUDOX® colloidal silica forms …
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1. Introduction. The formation process of colloidal silica via sol-gel method is of interest due to the fact that colloidal silica can be used in various fields. The colloidal silica …
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Key takeaway: 'Short mixing time improves tablet strength and disintegration without reducing lubricating efficiency, while colloidal silica improves tablet strength but …
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Due to the high surface area, adjustable surface and pore structures, and excellent biocompatibility, nano- and micro-sized silica have certainly attracted the attention of many researchers in the medical fields. This review focuses on the multifunctional roles of silica in different pharmaceutical formulations including solid preparations, liquid …
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Influence of colloidal silica sol (SS) consisting of mono-dispersed nano-silica on properties and microstructure of the hardened cement-based materials was investigated as compared to the nano ...
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The compressibility decreased only after 10 min of mixing for the blend having 1% colloidal silica loading (E1-10) and after 1000 of mixing for the blend having 5% colloidal silica loading (E5 – 1000) due to the de-aggregation of large colloidal silica aggregates in sufficient mixing time and better colloidal silica redistribution.
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In this study, modification methods of recycled coarse aggregate (RCA), namely spraying colloidal nano silica (NS) and silica fume (SF) on the surface of RCA, were adopted to enhance the performance of recycled aggregate concrete (RAC). In the RCA modification methods, colloidal NS with different particle sizes (12 nm, 54 nm and …
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Colloidal silica consists of silica molecules suspended in liquid, thereby forming a liquid sol. The process of creating colloidal silica is closely monitored to ensure that the silica molecules remain stable and separate within the liquid medium without collapsing into smaller component molecules or collecting into unstable silica gels.
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The gelation time (t gel) was determined from the rheological measurements at different frequencies of 0.1, 0.3 and 0.5 Hz. The results were analyzed using …
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Non-spherical colloidal silica particles are manufactured via a multi-step feeding method to compensate for the material removal rate of colloidal silica slurry, which is lower than that of fumed ...
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The particle size of colloidal silica is typically in the range of 1-100 nanometers, making it smaller than traditional silica particles found in sand or rocks. Due to its small size, colloidal silica has a large surface area, providing excellent binding properties. Colloidal silica solutions often appear transparent or slightly opaque and …
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AbstractThe effect of mixing time on hardness, disintegration time and ejection force in tablettlng of magnesium stearate and lactose granules was studied. The hardness of the …
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Silica gels have a multitude of applications ranging from cosmetics and food science to oil and gas recovery. For proper design and application, it is important to have a thorough understanding of the underlying mechanisms of gel formation under different circumstances. The growth and structure of colloidal silica gels has been investigated …
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Exposing specimens to a magnetic field increased compressive strength, with improvements up to 60.36 % for 7-day and 48.02 % for 28-day concrete at 1 T. Incorporating silica sand and micro silica in concrete positively impacts compressive strength under a magnetic field. Silica sand enhances compatibility with additives, …
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Colloidal silica, which refers to concentrated stable dispersions of sols made of discrete, dense particles of amorphous silica, 29 has excellent wear resistance. …
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The influence of mixing time and colloidal silica on the lubricating properties of magnesium stearate was studied using an instrumented single-punch machine. The lubricant was mixed with sodium chloride, anhydrous lactose, calcium citrate granulate and sodium chloride-colloidal silica-mixtures. Short mixing time decreased …
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