Silica wikipedia

Silica gel - Wikipedia

Silica gel is an amorphous and porous form of silicon dioxide (silica), consisting of an irregular tridimensional framework of alternating silicon and oxygen atoms with nanometer-scale voids and pores.The voids may contain water or some other liquids, or may be filled by gas or vacuum.In the last case, the material is properly called silica xerogel Kisel är ett halvmetalliskt grundämne med atomnumret 14 och det kemiska tecknet Si (latin: silicium).Kisel kan i likhet med kol bilda fyra kovalenta bindningar, men är inte lika reaktivt som kol. Rent kisel är kristallint och har en grå metallisk färg. Kisel liknar glas och är liksom detta starkt men mycket skört. Kisel är tämligen inert, men reagerar med halogener och baser, dock. Mesoporous silica is a mesoporous form of silica and a recent development in nanotechnology.The most common types of mesoporous nanoparticles are MCM-41 and SBA-15. Research continues on the particles, which have applications in catalysis, drug delivery and imaging.. A compound producing mesoporous silica was patented around 1970

In chemistry, a silicate is any member of a family of anions consisting of silicon and oxygen, usually with the general formula [SiO (4−2x)− 4−x] n, where 0 ≤ x < 2.The family includes orthosilicate SiO 4− 4 (x = 0), metasilicate SiO 2− 3 (x = 1), and pyrosilicate Si 2 O 6− 7 (x = 0.5, n = 2).The name is also used for any salt of such anions, such as sodium metasilicate; or any. Innehåll och egenskaper. Det finns olika typer av kattsand, exempelvis kan den tillverkas av bentonit. [1] Det är vanligt med konstgjort grus gjort av torkad lera, och pellets gjorda av pappersmassa eller träspån. [2] Kristallkattsand, även kallad silica kattsand, är en sorts kattsand som är gjord av kiselsyragel.. Kattströ kan ha olika egenskaper Kemiska egenskaper. Kiseldioxid är en sur oxid.Inom industrin framställs kiselgel ur salter av kisel (silikater, särskilt natriumsilikat) som behandlas med saltsyra eller svavelsyra så att det bildas en gelémassa. Den erhållna gelémassan renas med syror eller alkalier.Efter reningen torkas gelémassan till önskad vattenhalt för att sedan malas ned till ett mycket fint pulver i. Silicon is a chemical element with the symbol Si and atomic number 14. It is a hard, brittle crystalline solid with a blue-grey metallic lustre, and is a tetravalent metalloid and semiconductor.It is a member of group 14 in the periodic table: carbon is above it; and germanium, tin, and lead are below it. It is relatively unreactive. Because of its high chemical affinity for oxygen, it was not.

Välkommen till Wikipedia - den fria encyklopedin som alla kan redigera. I dag är det lördag den 14 november vecka 46 2020. Just nu finns det 3 569 527 artiklar på svenska. Utmärkt artikel. Newtown Railway Station är en järnvägsstation belägen i Newtown i New South Wales i Australien In silico syftar på det som kan simuleras med hjälp av en dator. Inom många biologiska vetenskaper är det vanligt att datorer används för att studera processer och skeenden, exempelvis kan datorer användas för att förutsäga tredimensionella strukturer för proteiner till viss grad.. Se även. In vivo; In utero; In situ; In vitr

Kisel - Wikipedia

Original Silicea, naturligt kisel för tjockare hår, frisk hud, starka naglar. Silicea Mag-Tarm vid IBS, illamående, ballongmage, magsyra Ledins Silica Plus innehåller pantotensyra (Vitamin B5), biotin, betakaroten, zink, kisel och åkerfräkenextrakt. 1 tablett per dag. Rekommenderad dagsdos bör ej överskridas. Kosttillskott bör ej ersätta en varierad kost. Per tablett (% DRI= procent av Dagligt referensintag): Pantotensyra (B5) 25 mg (417%DRI. Silicon dioxide.· Any of the silica group of the silicate minerals. 1993, Historic American Building Survey, Town of Clayburg: Refractories Company Town, National Park Service, 2: Its Blair County property was sited at the foot of ganister-covered Dunnings Mountain to compete with the Mount Union plants making silica bricks for the steel.

Silicon dioxide, also known as silica, is a chemical compound, the oxide of silicon.Its chemical symbol is SiO 2.It is known for its hardness since the 16th century. It is an important compound used in most types of glass and other hard substances such as concrete, porcelain and stoneware.It is made up of 2 oxygen atoms and 1 silicon atom Although some desiccants are chemically inert, others are extremely reactive and require specialized handling techniques.The most common desiccant is silica, an otherwise inert, nontoxic, water-insoluble white solid.Tens of thousands of tons are produced annually for this purpose. Other common desiccants include activated charcoal, calcium sulfate, calcium chloride, and molecular sieves. Silicon dioxide, kent an aa as seelicae (frae the Laitin silex), is a chemical compoond that is a dioxide o silicon wi the chemical formula Si O 2.It haes been kent syne auncient times. Silica is maist commonly foond in naitur as quartz, as well as in various livin organisms, Silica is ane o the maist complex an maist abundant faimilies o materials, existin baith as several minerals an bein. Siliciumdioxid også kendt som silica er den kemiske samlebetegnelse for stoffer med sumformlen (Si O 2).Stoffet tilhører gruppen af silikater.Krystallint SiO 2 findes vidt udbredt som mineralet kvarts.. Siliciumoxid bruges som bæremateriale til bl.a. katalysatorer på samme måde som alumina, og kaldes i denne forbindelse silica.Det ses også brugt som lakering på aluminium i f.eks. Silica, also called silicon dioxide, compound of the two most abundant elements in Earth's crust, silicon and oxygen, SiO 2. The mass of Earth's crust is 59 percent silica, the main constituent of more than 95 percent of the known rocks. Silica has three main crystalline varieties: quartz (by far the most abundant), tridymite, and cristobalite

Mesoporous silica - Wikipedia

Silica fume, also known as microsilica, (CAS number 69012-64-2, EINECS number 273-761-1) is an amorphous (non-crystalline) polymorph of silicon dioxide, silica.It is an ultrafine powder collected as a by-product of the silicon and ferrosilicon alloy production and consists of spherical particles with an average particle diameter of 150 nm Project Silica is developing the first-ever storage technology designed and built from the media up, for the cloud. We are leveraging recent discoveries in ultrafast laser optics to store data in quartz glass by using femtosecond lasers, and building a completely new storage system designed from scratch around this technology Hydrophobic silica is a form of silicon dioxide (commonly known as silica) that has hydrophobic groups chemically bonded to the surface. The hydrophobic groups are normally alkyl or polydimethylsiloxane chains. Hydrophobic silica can be processed in different ways; such as fumed silica, precipitated silica, and aerosol assisted self assembly, all existing in the form of nanoparticle Safe Silica is a joint project between industry and trade unions to provide information about crystalline silica and reduce the risk of silicosis in working environment Silica definition is - the dioxide of silicon SiO2 occurring in crystalline, amorphous, and impure forms (as in quartz, opal, and sand respectively)

Silicate - Wikipedia

Overview silica gel stationary phases for TLC.svg 955 × 545; 64 KB Overview silica gel stationary phases.svg 1,193 × 685; 119 KB P1000495.JPG 295 × 1,936; 73 K 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. The resulting powder has an extremely low bulk density and high surface area. Its three-dimensional structure results in. The silica cycle is the biogeochemical cycle in which silica is transported between the Earth's systems. Opal silica (SiO 2) is a chemical compound of silicon, and is also called silicon dioxide.Silicon is considered a bioessential element and is one of the most abundant elements on Earth. The silica cycle has significant overlap with the carbon cycle (see Carbonate-Silicate cycle) and plays. Radiolaria are amoeboid protists which produce mineral skeletons.The skeletons, usually of silica (SiO 2), have a central capsule.This divides the cell into inner and outer portions, called endoplasm and ectoplasm.. Radiolaria are found as zooplankton throughout the ocean, and their skeletal remains cover large portions of the ocean floor as radiolarian ooze

Kattsand - Wikipedia

There is considerable interest in the effects of silica on human health in contrast to prior research which focused solely on the toxic effects of inhaled crystalline silica. However, multiple forms of silica exist in nature and silicon, a component, is the second most prevalent element after oxygen VaTonga vanoti silika (to cure) vachireva kuporesa; Last edited on 19 Nyamavhuvhu 2019, at 15:08. Content is available under CC BY-SA 3.0 unless otherwise noted. This page was last edited on 19 Nyamavhuvhu 2019, at 15:08. Text is available under the Creative Commons Attribution-ShareAlike.

Kiseldioxid - Wikipedia

  1. silica gel. Wikipedia. Medicinsk informationssökning... är den egenskap hos vissa ämnen eller material att kunna ta upp vatten (vattenånga) från bland annat luften (se luftfuktighet)
  2. Colloidal silicas are most often prepared in a multi-step process where an alkali-silicate solution is partially neutralized, leading to the formation of silica nuclei. The subunits of colloidal silica particles are typically in the range of 1 to 5 nm. Whether or not these subunits are joined together depends on the conditions of polymerization
  3. ing, stone cutting, quarrying (especially granite), blasting, road and building construction industries that manufacture abrasives, and far
  4. Silica (Hongaars: Szilice) is een Slowaakse gemeente in de regio Košice, en maakt deel uit van het district Rožňava. Silica telt 554 inwoners. Silica; Gemeente in Slowakije: Situering: Regio: Košice: District: Rožňava: Coördinaten: Algemeen: Oppervlakte: 34,57 km² Inwoners (31-10-2010) 554 Hoogte: 546 m
  5. Quartz - Wikipedia. Quartz Varieties: Quartz, Agate, Amethyst, Chalcedony, Flint Fumed silica - Wikipedia. File:Fused silica phosphorescence from a 24 million watt Optical fiber - Wikiwand. File:Fused silica phosphorescence from a 24 million watt Blood Quartz.

Silicon - Wikipedia

Wikipedia, den fria encyklopedi

Cristobalite - Wikipedia

Siliciumdioxid - Wikipedia, den frie encyklopæd

Optical fiber - Wikipedia

Hydrated silica - Wikipedia

  1. Silica - Biquipedia, a enciclopedia libr
  2. Silica - Wikipedia
  3. Silica - Vikipedi

Video: Brusilica - Wikipedij

tridymite - Wiktionary

Silicon Valley - Wikipedia

  1. silica gel - Wiktionar
  2. Category:Silica gel - Wikimedia Common
  3. Fumed silica - Wikipedia
  4. Silica cycle - Wikipedia
  5. Radiolaria - Simple English Wikipedia, the free encyclopedi

The chemistry of silica and its potential health benefit

  1. Silika - Wikipedia
  2. Silica gel. Medicinsk sök. Wikipedia
  3. Colloidal silica - Wikipedia
  4. Silica dust definition of Silica dust by Medical dictionar
Chrysocolla - WikipediaBorosilicate glass - WikipediaDemosponge - WikipediaFire shelter - Wikipedia
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