Sodium silicate solution

Fig. 5. Viscosities of sodium silicate solutions vs percent solids A, ratio of 3.22 B, 2.4 C, 2.0 D, 1.6 and (-----), NaOH. To convert Pa-s to poise, divide...

Silicate Grouts. Sodium silicate [1344-09-8] h.3.s been most commonly used in the United States. Its properties include specific gravity, 1.40 viscosity, 206 mPa-s(=cP) at 20°C Si02 Na20 = 3.22. Reaction of sodium silicate solutions with acids, polyvalent cations, such organic compounds as formamide, or their mixtures, can lead to gel formation at rates, which depend on the quantity of acid or other reagent(s) used. 

It is advisable to saturate all corks with sodium silicate solution after fitting and boring them (p. 3, Note i). They are then covered with lead foil, wired in, and coated with shellac. 

Sodium silicate solution [1344-09-8] pKj 9.51, pKj 11.77 (for silicic acid, H4Si04) Purified by contact filtration with activated charcoal. 

When a sodium silicate solution is acidified condensation reactions occur. Firstly, silanol... 

Prepared by precipitation from a mixture of magnesium sulfate and sodium silicate solutions and calcined at about 1200 °C. 

Silica gel. Silica gel is a porous amorphous form of silica (Si02) and is manufactured by acid treatment of sodium silicate solution and then dried. The silica gel surface has an affinity for water and organic material. It is primarily used to dehydrate gases and liquids. 

The transfer to the retort must be made before the mixture solidifies. The best method of closing the tubulure of the retort (unless this consists of Pyrex glass) is by means of a glass stopper too small for the hole and wrapped with asbestos paper moistened with sodium silicate solution. 

Coradin, T., Coupe, A. and Livage, J. (2003) Interactions of bovine serum albumin and lysozyme with sodium silicate solutions. Cdloids and Surfaces B-Biointerfaces, 29, 189-196. 

About one decade ago Bass et al. [13,14] proposed first that such approach could help in exploring the structure of water dissolved silicates. Following this initiative, recently we critically evaluated how the published FTIR and Raman assignments could be adopted for differentiating between the molecular structures of some commercially available sodium silicate solutions [7-9,15], In this paper we present comparative structural studies on aqueous lithium and potassium silicate solutions as well. According to some NMR studies, the nature of A+ alkaline ion and the A+/Si ratio barely affects the structural composition of dissolved silicate molecules [5], In contrast, various empirical observations like the tendency of K-silicate solutions to be less tacky and more viscous than their Na-silicate counterparts, the low solubility of silica films obtained from Li-silicate solutions compared to those made from other alkaline silicate solutions, or the dependence of some zeolite structures on the nature of A+ ions in the synthesis mixture hint on likely structural differences [16,17]. It will be shown that vibrational spectroscopy can indeed detect such differences. 

When generation is complete, the resulting sodium silicate solution is rapidly run out via the trapped discharge pipe and the interior of the generator washed with cold water supplied from the tap B. Thermometers at Ti, T2, T3, and T4 enable the temperature at different parts of the apparatus to be observed and, if necessary, controlled. 

By achieving random dispersion of the Kaolin in the sodium silicate solution prior to formation of the silica-alumina gel, it was possible to disperse the clay crystals. They condensed somewhat perpendicular to each other and were bound together by silica-alumina gel. I therefore speculated that spray drying, during which the gel system contracts, might create a dual structure. An analogy would be a house built of cards (Kaolin), cemented together with silica-alumina gel. 

Holding a very dilute suspension of magnetite particles in sodium silicate solution at room temperature for 4 days produces magnetite with a uniform, 3 nm Si02 coating (Philipse et al., 1994 Correa-Duarte et al., 1998). 

The present study deals with the application of RDF to the sodium aluminosilicate hydrogels, which were formed by mixing, aging and heating of sodium silicate solution with sodium aluminate solution under stirring, in order to produce NaA-zeolite crystal. 

The chemical analyses of raw materials, namely sodium silicate solution and sodium aluminate solution, are as follows ... 

The sodium silicate solution was heated to 50 C, and 350cm of the solution was put into a beaker of ca. 1dm in a water-bath. Under stirring with a stirrer... 

Furthermore conversely, the heated sodium silicate solution was added into the heated sodium aluminate solution. After mixing for 5 minutes, corresponding to sample A, the hydrogel sample was prepared as sample C. 

Silica gel is synthetic amorphous silica consisting of a compact network of spherical colloidal silica particles. Its surface area is typically between 300 and 850 m2/g. The predominant pore diameters are in the range 22-150 A. Silica gel is produced via the following procedure a sodium silicate solution reacts with a mineral acid, such as sulfuric acid, producing a concentrated dispersion of finely divided particles of hydrated Si02,... 

If only one run is to be made, good quality corks are satisfactory. If several runs are made, it is recommended that the corks be impregnated with sodium silicate solution to prevent excessive corrosion by the hydrogen chloride and chlorine. 

It is now clear that the process of stabilizing nitrocellulose used by Lenk [9] that consisted in washing nitrocellulose with running water for 14 days, followed by a boil with dilute carbonate solution and a final washing with a sodium silicate solution (p. 293), was not sufficient to produce a completely stable product. 

A sodium aluminate solution (2.00 moles Al203/liter, 3.40 moles Na20/ liter, density 1.36 grams/ml) produced from hydrargillite was used as the alumina source in each series of tests. Silica was used as sodium silicate solution (5.98 moles Si02/liter, 1.77 moles Na20/liter, density 1.36 grams/ ml) and as solid amorphous silica with different surface areas (Table I). 

Zeolite Y may be obtained either by using a sodium silicate solution or from silica sol (7, 8). The formation of zeolite Y depends on the time of action of NaOH on the sol before the introduction of aluminate (7). It has been believed that this phenomenon depends upon a depolymerization of the silica contained in the sol. The phenomena occurring during the synthesis of zeolite Y were also investigated by measuring changes in the liquid and solid phases of the hydrogel. 

Synthesis of MCM-41 with Additives. The hydrothermal crystallization procedure as described earlier [10] was modified by adding additional salts like tetraalkylammonium (TAA+) bromide or alkali bromides to the synthesis gel [11]. Sodium silicate solution ( 14% NaOH, 27% Si02) was used as the silicon source. Cetyltrimethylammonium (CTA) bromide was used as the surfactant (Cl6). Other surfactants like octadecylltrimethylammonium (ODA) bromide (C,8), myristyltrimethylammonium (MTA) bromide (C,4) were also used to get MCM-41 structures with different pore diameter. Different tetralkylammonium or alkali halide salts were dissolved in little water and added to the gel before addition of the silica source. The final gel mixture was stirred for 2 h at room temperature and then transferred into polypropylene bottles and statically heated at 100°C for 4 days under autogeneous pressure. The final solid material obtained was washed with plenty of water, dried and calcined (heating rate l°C/min) at 560°C for 6 h. 

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