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  • moisture
  • Gently heating silica gel will drive off the adsorbed moisture and leave it ready for reuse. (alibaba.com)
  • What this means is that a farmer would need less silica gel than Zeolite beads to dry seeds from ambient humidity to a safe moisture content for short-medium term storage (≤ 50% eRH). (biodiver.se)
  • Using Zeolite beads to dry seeds down to very low moisture contents for long-term storage is a different matter and as Fiona's paper demonstrates, Zeolite beads may have it over silica gel for this purpose. (biodiver.se)
  • In World War II, silica gel was indispensable in the war effort for keeping penicillin dry, protecting military equipment from moisture damage[citation needed], as a fluid cracking catalyst for the production of high octane gasoline, and as a catalyst support for the manufacture of butadiene from ethanol, feedstock for the synthetic rubber program. (wikipedia.org)
  • Silica gel is often described as "absorbing" moisture, which may be appropriate when the gel's microscopic structure is ignored, as in silica gel packs or other products. (wikipedia.org)
  • When a visible indication of the moisture content of the silica gel is required, ammonium tetrachlorocobaltate(II) (NH4)2CoCl4 or cobalt chloride CoCl2 is added. (wikipedia.org)
  • If a container is not sealed tightly, the silica gel absorbs moisture from the air, and flowers dry too slowly or not at all. (wikipedia.org)
  • Molecules
  • Alcohols and other polar molecules are easily adsorbed by forming hydrogen bondings with OH groups on silica gel surface. (bibsys.no)
  • Each of the silica gel (0.25g) samples with different surface areas and silanol number was pressed into a small disc, placed in a glass vial and the physically adsorbed water molecules from the surface of the silica gel particles were removed by heating the sample to 200 °C under vacuum. (bibsys.no)
  • Aerogel structure results from a sol-gel polymerization, which is when monomers (simple molecules) react with other monomers to form a sol or a substance that consists of bonded, cross-linked macromolecules with deposits of liquid solution between them. (wikipedia.org)
  • 0.25
  • The optimal immobilization process was as follows: about 0.02 g of aminated silica gel microspheres was activated by 0.25% GA solution for 6 h and mixed with 5 U of free recombinant COX-2 solution. (mdpi.com)
  • powder
  • By adding fluorous reversed-phase silica gel to a solution of a perfluoro-tagged diphenylphosphine Pd(II) dichloride in diethyl ether and hexafluorobenzene and evaporating the solvent, an immobilized Pd complex is easily recovered as air-stable, free-flowing powder. (sigmaaldrich.com)
  • Stabilizing silica gel - non-crystalline micro-porous solid powder, nontoxic, flame-resisting, used in brewery of grains for beer to improve taste, clearness, color and foam, removal of non-micro-organism impurities. (wikipedia.org)
  • chemically
  • de Oliveira FM, Segatelli MG, Tarley CR (2016) Hybrid molecularly imprinted poly(methacrylic acid-TRIM)-silica chemically modified with (3-glycidyloxypropyl)trimethoxysilane for the extraction of folic acid in aqueous medium. (springer.com)
  • amorphous
  • Fumed silica (CAS number 112945-52-5), also known as pyrogenic silica because it is produced in a flame, consists of microscopic droplets of amorphous silica fused into branched, chainlike, three-dimensional secondary particles which then agglomerate into tertiary particles. (wikipedia.org)
  • Synthesis
  • V. M. Bogatyrov, M. V. Borysenko, I. V. Dubrovin, M. V. Abramov, M. V. Galaburda, and P. P. Gorbyk, "Synthesis and properties of magnetosensitive nanocomposites based on iron oxide deposited on fumed silica," in Nanomaterials and Supramolecular Structures , A. P. Shpak and P. P. Gorbyk, Eds. (hindawi.com)
  • Liquid
  • Silica gel contains a nano-porous silica micro-structure, suspended inside a liquid. (wikipedia.org)
  • Aerogel is a synthetic porous ultralight material derived from a gel, in which the liquid component of the gel has been replaced with a gas. (wikipedia.org)
  • This allows the liquid to be slowly dried off without causing the solid matrix in the gel to collapse from capillary action, as would happen with conventional evaporation. (wikipedia.org)
  • Molten silica exhibits several peculiar physical characteristics that are similar to those observed in liquid water: negative temperature expansion, density maximum at temperatures ~5000 °C, and a heat capacity minimum. (wikipedia.org)
  • Chemistry
  • citation needed] The synthetic route for producing silica gel was patented by chemistry professor Walter A. Patrick at Johns Hopkins University in 1918. (wikipedia.org)
  • Silica" in Ullmann's Encyclopedia of Industrial Chemistry, 2008, Weinheim: Wiley-VCH. (wikipedia.org)
  • packet
  • Open a bottle of vitamins, a box of new shoes, or an electronics package and you'll often encounter a little packet of silica gel. (thekitchn.com)
  • I am storing some already dried shrooms in a zip lock bag with a silica gel packet in the bag with them. (shroomery.org)
  • Silica gel is most commonly encountered in everyday life as beads in a small (typically 2 x 3 cm) paper packet. (wikipedia.org)
  • Immobilization
  • The immobilization of perfluoro-tagged Pd catalysts on fluorous reversed-phase silica gel and the successful application to Suzuki and Sonogashira couplings have been described. (sigmaaldrich.com)
  • warnings
  • Printed warnings usually tell you to throw it away (and don't even think about eating it), but silica gel can actually be put to good reuse in the kitchen. (thekitchn.com)
  • beads
  • One of Rhino's latest products using the beads are bins containing a core of beads which is in contact with some indicating silica gel. (biodiver.se)
  • Seeds are put in the bin and the silica is used to know when to regenerate the beads. (biodiver.se)
  • What annoys me most about the USAID fact sheet promotion of Zeolite beads is that it brags the value of Zeolite beads over silica gel for small farmers drying seeds for sowing. (biodiver.se)
  • We buy silica gel beads that we use in our drying drums designed for small-scale seed drying for less than 10 US $ a Kg. (biodiver.se)
  • However, as the paper also points out, calculating the weight of Zeolite beads needed is not straightforward and compared to silica gel there is a much greater risk of over drying. (biodiver.se)
  • synthetic
  • Silica is one of the most complex and most abundant families of materials, existing as a compound of several minerals and as synthetic product. (wikipedia.org)
  • aqueous
  • An aqueous solution of sodium silicate is acidified to produce a gelatinous precipitate that is washed, then dehydrated to produce colorless silica gel. (wikipedia.org)
  • relative humidity
  • Silica gel may also be used to keep the relative humidity (RH) inside a high frequency radio or satellite transmission system waveguide as low as possible (see also Humidity buffering). (wikipedia.org)
  • water
  • The "hydrated" form, as found in Gel, means that Silica and purified water form a complex to be more easily absorbed by the body. (evitamins.com)
  • Once saturated with water, the gel can be regenerated by heating it to 120 °C (250 °F) for 1-2 hours. (wikipedia.org)
  • Some types of silica gel will "pop" when exposed to enough water. (wikipedia.org)
  • This is caused by breakage of the silica spheres when contacting the water. (wikipedia.org)
  • High
  • The resulting product contains over 99% silica, and has high crystallinity and surface area (over 800 m2/g). (wikipedia.org)
  • material
  • To dry the material, silica gel is spread on open pans or cookie sheets in a layer ½ to ¾ inch thick. (wikipedia.org)
  • The most common material is clay, although recycled paper "pellets" and silica-based "crystal" variants are also used. (wikipedia.org)
  • surface
  • Zheng H et al (2007) Highly selective determination of palladium(II) after preconcentration using Pd(II)-imprinted functionalized silica gel sorbent prepared by a surface imprinting technique. (springer.com)
  • Modification of silica gel surface by hematite in the quantity of 0.62 and 1.25 mass% has been carried out by means of a citric acid aided method. (hindawi.com)
  • The mass of the silica gel pellet was determined by an analytical balance and the methanol adsorbed on the surface was calculated. (bibsys.no)