Colloidal silica stabilization of a loose to moderately dense silty sand with 10% fines improves significantly both its monotonic and cyclic response and thus reduces substantially its liquefaction potential. Ciardi et al. investigated the effects of high-diluted colloidal silica grouting on the behavior of liquefiable sand. Based on the ...
The stability of colloidal silica sols (Ludox HS and Ludox AM) in the presence of various concentrations of NaCl, LiCl, KCl, CsCl, NaBr, NaI, CaCl 2, and Ca (NO 3) 2 has been studied as a function of pH. With increasing pH the stability of the silica sols towards electrolytes markedly decreases except for KCl and CsCl which show a minimum in ...
In spite of the apparent simplicity of silica's composition and structure, scientists are still investigating fundamental questions regarding the formation, constitution, and behavior of colloidal silica systems. Colloidal Silica: Fundamentals and Applications introduces new information on colloid science related to silica chemistry as well
The mechanical effect of colloidal silica concentration in copper chemical mechanical planarization (CMP) is considered in this paper by using friction force monitoring system. The copper peak was detected in the result of the energy-dispersive X-ray (EDX) spectra of the polishing residues. The addition of colloidal silica …
Effect of hydrolyzable cations. The stabilities of the silica hydrosols Ludox HS and Ludox AM have been studied as a function of pH in the presence of various concentrations of several hydrolyzable electrolytes. "Log electrolyte concentration-pH" domains are given for the HS sol in Al (NO solutions and for the AM sol in Al (NO solutions.
Effect of colloidal silica on compressibility of binary mixtures. Evaluating of the mixture compressibility was selected as a test, indicating their ability to consolidate under mechanical stress. The normal stress range of 1 – 15 kPa is too low to affect any …
In this study, colloidal silica nanofluid was synthesized using sodium silicate, and its effect on alteration in interfacial tension of water containing nanofluid and oil, …
Hydrolysis and polycondensation of ETS40 (ethyl silicate 40) in the presence of water colloidal silica sols. Colloids and Surfaces A: Physicochemical and Engineering Aspects 1993, 70 (3), ... Effect of pH on the rheological properties of a silica hydrosol. Journal of the European Ceramic Society 1990, 6 (3) ...
Tavakoli, H. M. et al. Experimental investigation of the effect of silica nanoparticles on the kinetics of barium sulfate scaling during water injection process. J. Petrol. Sci. Eng. 169, 344 ...
In this paper, effects of the colloidal silica sol addition on mechanical and durable properties of the hardened cement-based materials were further investigated as compared to the nano-silica powder with agglomerates in micron-scale. Its influence on microstructure improvement of the hardened cement-based materials were studied …
The effect of surface deprotonation of colloidal silica particles on settling mode transition has been studied quantitatively. We observed the settling mode transitions of silica aqueous suspensions … Expand
Colloidal silica, which refers to concentrated stable dispersions of sols made of discrete, dense particles of amorphous silica, 29 has excellent wear resistance. …
We also studied the effect of fumed silica particle concentration in PEGdm(250); a larger relative change in the gel modulus was observed for the materials containing lower concentration of fumed silica. A "concentration" effect due to polymer adsorption and chemical reaction on the particles' surface seems to explain this anomalous observation.
Trompette, J. & Meireles, M. Ion-specific effect on the gelation kinetics of concentrated colloidal silica suspensions. J. Colloid Interface Sci. 263, 522–527 (2003).
As far as the type (powder or colloidal) of nS is concerned, colloidal silica has shown a better effect on concrete compared to its powdered form. Pacheco-Torgal et al. [3] found that the colloidal dispersion of nS was much more effective than the dry powder to control CSH degradation caused by the leaching of calcium.
Colloidal silica is used in many applications including catalysis, pharmaceuticals, and coatings. Although naturally formed silica materials are widely available, they are often in forms that are difficult to process or are even harmful to health. Therefore, uniform colloidal silicas are generally manufactured using synthetic chemical …
pH measurements versus time obtained from stimulated colloidal silica batch experiments in experimental series 3 containing 0.1, 1, or 10 g/L yeast extract and 2.5, 3.75, or 5 g/L glucose. All ...
Silica is a solid with uncharged silanol groups (Si OH) and charged silicic acid groups (Si O −) on its surface.The negative surface charge of silica above its isoelectric point (iep ∼ 2 [24]) is determined by the dissociated silanol groups. Fig. 1 shows that ions of positive charge as those from the monovalent alkali metal series Cs +, K +, Na + and Li …
Colloidal silica is a low-viscosity chemical grout. Samples of grouted sand were made by pouring sand into liquid grout in molds, with the grout diluted to concentrations ranging from 5 to 27% ...
The procedure used for production of colloidal nano-silica by Jafari et al. [20] utilized silica fume as a raw material. The process initially involves the mixing of 1 g of silica fume with 100 ml ...
Nanosized colloidal silica used as a glidant has a tendency to self-agglomerate because of strong attractive forces. Therefore, creating a uniform distribution of nanosilica throughout the cohesive powder mass is very important to achieve a good glidant effect. ... Based on this hypothesis, a study was carried out by Kojima and Elliott …
The effect of alkyl-silane treatment on charging of colloids in an apolar medium (Isopar-L isoparaffin) was studied using two otherwise identical 250 nm diameter, spherical silica particles, one with untreated surface and the other treated with hexadecyltrimethoxysilane (C16). The electrophoretic mobility of each particle type was …
The attention paid to colloidal silica has been constantly growing for many decades due to the development of nanotechnology [1–6].Many properties of materials …
These side effects may include: Headache: Silica may cause headache, especially in people with pre-existing migraine or tension headaches. This is because silica can cause changes in blood flow and oxygenation in the brain, leading to headache and dizziness. Allergic reactions: Some people may be allergic to silica colloidal anhydrous …
The effect of colloidal silica (CS) on the hydrate phases and microstructure evolution of calcium aluminate cement (CAC) was investigated. Samples hydrated with CS were obtained and characterized by X-ray diffraction (XRD), Field Emission Scanning Electron Microscopy (FESEM), Fourier Transform Infrared …
The accelerating effect of colloidal silica has been known for more than 50 years [75], and colloidal silica suspensions are sometimes used as accelerators for well-cementing …
The pH effect on silica dissolution has been widely reported in the last few decades to understand the chemical ... hence, deeply impacts the silica degradation rate. Ideally, the IEP of bare colloidal …
The effect of colloidal silica (CS) on the hydrate phases and microstructure evolution of calcium aluminate cement (CAC) was investigated. Samples hydrated with CS were obtained and characterized by X-ray diffraction (XRD), Field Emission Scanning Electron Microscopy (FESEM), Fourier Transform Infrared spectroscopy (FT-IR), …
