Under hydrothermal conditions (3 kb, 100° to 300°C, 25 to 5,200 hr), freshly solidified silica gel crystallized to quartz, predominantly in the form of chalcedonic spherulites. No intermediate crystalline phases in the transition from amorphous
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Exposure of a mixture of propargyl vinyl ketone and a nucleophilic primary or secondary amine to activated dry silica gel in the absence of solvent leads to a cascade of reactions that results in the formation of an aminocyclopentenone
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In chemistry, silica gel is used in chromatography as a stationary phase. In column chromatography the stationary phase is most often composed of silica gel particles of 40-63 μm. Different particle sizes are used for achieving a desired separation of
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Silica gel is a highly absorbent material made from sodium silicate. Typically sold in granular form or in pre-sealed packets, silica gel is used to absorb moisture or vapor from consumer products such as food, medicine, leather goods and
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• Alone, silica gel is non-toxic, non-flammable and chemically unreactive. However, some of the beads may be doped with a moisture indicator, such as cobalt (II) chloride, which is carcinogenic. Cobalt (II) chloride is deep blue when dry
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The domestic and foreign common desiccant packaging material is divided into: home ventilation paper (filter paper) class, non-woven, compound paper, textured paper and DuPont Tyvek (Tyvek).
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One-component RTV silicone rubber vulcanization reaction of water and air play a role in the vulcanized into elastomers. With the chain of agents for one-component RTV silicone rubber, the Ents? Uerung type deoximation type dealcoholized, de
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Silicone resin is a thermoset, which is one of the most important benefits of excellent thermal oxidation stability. 250 ℃ heating 24 hours, the silicone resin weight loss of only ~ 8%. Another outstanding performance silicone resin excellent
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To γ-trifluoropropyl methyl siloxane structural unit of fluorine for the silicon rubber with good oil resistance, solvent resistance and good resistance to high and low temperature performance, in the aviation industry has an important application;
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Silicone oil is a different degree of polymerization of the structure of polysiloxane chain. It is dimethyldichlorosilane with water hydrolysis condensation ring body early, ring body by cracking, distillation is too low, ring body, and then the ring
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