##tihuan2##The abrasion-resistance and hydrophobicity of sol–gel silica AR coating were significantly improved by surface modification of PMHS with hydrogen content of 0.2% while maintaining a very high transmittance of 99.6%.
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##tihuan2##In this paper, a series of single-layer hydrophobic anti-reflection silica coatings with adjustable refractive index between 1.13 and 1.44 is obtained via the hybridization of hydrophobic-modified ...
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##tihuan2##In this in vitro study, the influence of the concentration of abrasive particles on the abrasivity of toothpastes was investigated using laser scan profilometry on polymethyl methacrylate (PMMA) surfaces with the aim of providing an alternative method to developers for screening of new toothpaste formulations. PMMA plates were tested in …
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##tihuan2##The challenge becomes how to use silica at a much lower level and yet obtain excellent scratch resistance and have no effect on haze. This can be done by index matching and, as mentioned previously, achieve a refractive index of 1.55, which is close to that of resins. Other critical factors are nano concentration, film thickness and particle size.
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##tihuan2##The magnetite concentrate weight recovery, SG, abrasion index Ai, iron and silica content were based on the following relationships: Concentrate weight recovery % = 10.737 ln(P80) - 3.0945
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##tihuan2##A fourth index attributed to Bond is the abrasion index (Ai) which is used to predict the quantity of liner and ball wear in classical comminution equipment. One complication to comparing parameters is …
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##tihuan2##Improving the abrasion resistance of hydraulic-concrete containing surface crack by adding silica fume. ... with variable surface crack type and silica fume content. The test results concluded that: (1) the abrasion rate is higher for water flow impinging directly on the crack than that above the crack; (2) increased crack width reduces the ...
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##tihuan2##The particle size of the ingredients used in manufacturing toothpaste can lead to abrasion of the teeth. This, in combination with the hard bristles, can cause more harm to the teeth …
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##tihuan2##The article focuses on comparing the friction, abrasion, and crack growth behavior of two different kinds of silica-filled tire tread compounds loaded with (a) in-situ generated alkoxide silica and (b) commercial precipitated silica-filled compounds. ... abrasion index, and fatigue crack propagation were investigated. Compared to …
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##tihuan2##Whitening toothpastes contain both a bleaching agent and an abrasive, such as silica. The bleaching agents commonly used are peroxide-based or sodium tripolyphosphate.
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##tihuan2##The relationship between porosity and refractive index can be depicted by the following equation: (1) n pc 2 = (n dc 2-1) (1-P / 100) where n pc and n dc are the refractive index of the porous and dense silica coating, respectively, and P is the percentage of porosity in the porous silica coating.
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##tihuan2##The relationship between Los Angeles abrasion index and compressive strength of aggregate rocks. ... The objective of this study is to identify and quantify the effect of silica fume content (SF ...
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##tihuan2##Our purpose was to apply a radiometric method to an abrasiveness evaluation in samples of silica and calcium carbonate used as an abrasive in a …
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##tihuan2##PMMA plates were tested in a toothbrush simulator with distilled water and four model toothpastes with increasing content of hydrated silica (2.5, 5.0, 7.5, 10.0 wt%).
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##tihuan2##A high iron content, low gangue content (responsible of slag), and basicity (between 1.6 and 2.1) are important from the compositional point of view (see in Table I the sinter
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##tihuan2##The reinforcing effect of carbon black and silica in ENR compounding are compared and described further. The effect of epoxidation level ... − 4 wt% relative to silica content Processing oil. b. 5 5 Zinc oxide 3 3 Stearic acid 2 2 Antioxidant 2 2 Sulphur 1.5 1.5 CBS. c. ... Abrasion resistance index 125 87 88 Compression set, 22 h at 70 °C ...
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##tihuan2##no distinction between wear and abrasion, although other researcher (Schallamach, 1957/58) defined abrasion as that produced by laboratory machine on a rubber piece and wear as something that happens to tires or other rubber products. Thus, for rubber, abrasion covers all mechanisms, whereas the wo rd abrasion for other materials refers in
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##tihuan2##The addition of PDMS to the silica sols improved the hydrophobicity and abrasion-resistance of the coating, and prevented to some extent the coating from cracking which occurred in a pure ...
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##tihuan2##A double-layer broadband antireflective (AR) coating was prepared on glass substrate via sol-gel process using two kinds of acid-catalyzed TEOS-derived silica sols. The relative dense layer with a porosity of ∼10% was obtained from an as-prepared sol, while the porous layer with a porosity of ∼55% w …
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##tihuan2##The PSU Silica Rock used in testing was a commercially crushed and screened sand, whereas other rock samples were in the form of cores or blocks. ... The linear curve fit has a R-squared of 0.64. This is not a surprise since CAI is an abrasion index of intact rock which involves rock strength, as noted earlier, and it does not apply …
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##tihuan2##resulted in the improved abrasion index of the blends up to . ... and 5 wt% of silica content and the optimized PMMA-co-MAA was utilized to investigate the self-healing NR/silica composites at ...
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##tihuan2##The high transmittance and the strong ability of resisting abrasion make this coating promising for applications in some harsh conditions and the preparation is simple, low-cost, time-saving, and flexible for realizing the optical property. A double-layer broadband antireflective (AR) coating was prepared on glass substrate via sol-gel …
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##tihuan2##The effects of freeze-thaw cycles (0, 10, 30, 50, 70), debris flow velocities (2.5 m/s, 3.0 m/s, 3.5 m/s), and abrasion modes (abrasion-freeze, freeze-abrasion) on the abrasion resistance are ...
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##tihuan2##Their major cleaning effects are due to the mechanical action of the abrasives on the surface of the teeth. 1 Examples of common abrasives include hydrated silica, calcium carbonate, sodium …
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##tihuan2##Amount of silica fume content was 15% of the total binder content (71 kg/m3). A commercial carboxic type hyperplasticizer was employed to maintain a constant workability of slump in the order of 10–15 cm (see Table 4). Amount of hyper plasticizer was 4 % of the binder content by mass. ... Figs. 5 and 6 LA-Abrasion Index (%) 0 30 2 y = -0 ...
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##tihuan2##The purposes have been to evaluate if toothpastes with higher abrasive content cause more damage to the tooth surface and to investigate the relation between abrasivity and cleaning–whitening . Abrasion studies have been performed in vitro using various specimens of enamel and dentine.
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##tihuan2##An ultralow-index top layer is a prerequisite to preparing high-performance broadband AR coatings. When coupled with hydrophobicity and the abrasion-resistance required in practical applications, the challenge becomes even greater. In this work, a MgF2 AR coating was studied because of the low refractive index of MgF2 and its easily …
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##tihuan2##The properties like hardness, tear strength and resistance to oil increase with the amount of silica content while swelling index decrease with silica loading and the …
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##tihuan2##A three-layer tri-wavelength broadband antireflective (AR) coating has been successfully fabricated on quartz substrate via a sol–gel route using acid-catalyzed silica sols. An ethylene oxide-propylene oxide-ethylene oxide triblock copolymer is used as a template to prepare ordered mesoporous SiO2 films. Assisted by Filmstar thin film …
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