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Can you please tell me why I would find Silicon dioxide in the ingredients list on a packet of food and how safe is it to consume?
I second this -- Plonk420 22:09, 19 Apr 2005 (UTC)
While I'm not sure why it exactly would be an *additive*, I do know that many people commonly ingest it - in the form of vegetables. Silica is fairly common in plant cell walls. One study I know of (there might be more) suggests that silicon dioxide may help lower cholesterol [1]. Of course, I doubt that that's what Burger King had in mind. One theory says that silica is added to increase the crunch in, say, pies or burgers. Silica is poorly absorbed by the body, so it shouldn't be too much of an issue (and again, it's commonly found in edible plants). Im guessing that the danger with eating those silica gel packets found in beef jerky packages and other snacks (used to keep the pack dry) is the possibility of *inhaling* it. That would cause silicosis, which would be bad. As a food additive, it *should* be stuck on food well enought that inhalation shouldn't be a problem. bluemonq 23:26, 7 May 2006 (UTC)
-It is used as a drying agent in powdered typed foods. — Preceding unsigned comment added by 2601:187:4000:DDBF:A4EE:126:6A5F:2DD5 ( talk) 12:58, 7 June 2017 (UTC)
says "& Not more than 2% Silicon Dioxide added (as an anti-caking agent)" It also appears again in the same list saying "Not more than 2% each of Calcim Silicate & Silicon Dioxide added (as an anti-caking agent)" 74.67.65.212 ( talk) 18:06, 07 Dec 2008 (UTC)
Inhaling crystalline silica DUST can cause silicosis. The gel packets dont have dust, they typically have beads. If you want to see why you should not eat them, pour a fresh dry pack of the beads into water and watch them explode...
Speaking of all this, the Burger King page was a little bothersome, and the SiO2 was hard to find mentioned- would somebody perhaps just compile a list or something so that we wouldn't have to look so hard or pick on Burger King?-- Honalululand 20:47, 16 January 2007 (UTC)
When Companies mess up and add too much Silicon dioxide people get pretty sick. My 1 year son went to the hospital over night when we was throwing up. I looked on the ingredients list and saw Silicon dioxide. I thought in my head,"why do they have silicon in food?". Vstmassie ( talk) 17:09, 23 April 2008 (UTC)
Please do not take this the wrong way but maybe it was something else that made your little boy sick? Cross contamination of prep surfaces, not sufficiently sanitized containers or hands or something quite other and random (children get stomach upsets and do vomit on occasion.) It's highly unlikely that it was due to too much "silicon" in his food. As to why it is in Nestea mix it is as an anti-caking agent, it prevents "clumping" and hardening of the powder due to exposure to air (moisture.) That is it's primary purpose when added to foods and then it seems to mostly be used in powdered and dehydrated items.) —Preceding unsigned comment added by 68.153.130.132 ( talk) 19:17, 30 January 2009 (UTC)
There seems to be some evidence of potential adverse health effects from ingestion. Eg https://pubmed.ncbi.nlm.nih.gov/25586546/ Not sure how to summarize that in the article Raisins31415 ( talk) 15:55, 2 April 2021 (UTC)
Silica is now being used in motorcycle tire manufacturing. It makes the tires more compliant and temperature stable. This lets manufacturers make tires that grip better and still handle loads, without excessive wear from higher temperatures. It also affects wet weather traction. 2601:8:AA00:2DC:CD6:966F:8156:F87B ( talk) 03:30, 23 April 2015 (UTC)edited for spelling and homophones by Wendy Neumeyer Silicon dioxide is insolble in water where as it can be disolved in HF to produce hydro flouro silisic acid [HSiF6] which is used as itching of glass — Preceding unsigned comment added by 106.76.236.3 ( talk) 05:50, 8 December 2020 (UTC)
Please outline some of the basic reactions that silica gel is likely to undergo, especially those relating to the preparation of the products listed in the page. could you also include a method for purifying the silica source into the final silica product.
Please come to my job and do it for me so I can stay at home and throw food at my wall. —Preceding unsigned comment added by 192.198.151.130 ( talk) 10:45, 21 February 2008 (UTC)
silicon dioxide do not dissolve in water where as it can be dissolved in hydrogen flouride[common formulae HF] to produce hydrofloro silisic acid [h2sif6] which is used as an agent for itching of glass — Preceding unsigned comment added by 106.76.236.3 ( talk) 05:54, 8 December 2020 (UTC)
Isn't it a good thing to have silica in shampoo? But what does it do in it? 71.250.17.62 02:20, 17 June 2006 (UTC)
As far as I know there is no free silicon in nature, but silicon is in oxidized form; in silicon dioxide (quartz etc.) or in complex oxides with metals (silicates). So there is little to happen (chemically) for silicon in a fire or in a lightning. I removed the fires and strokes of lightning producing silicon dioxide(and fulgurites added there afterwards). -- AB-fi 18:29, 11 July 2006 (UTC)
How soluble is silicon dioxide? My chemistry teacher told me to always remember nothing is insoluble. That, in water (an excellent solvent) everything disolves a bit. Even gold, plastics and, yup, sand. So whats the figure? It should be included in the table, along with any solvent it dissolves in strongly enough in to be consideded actually quite soluble. I would love to find something that will dissolve the beakers in which it was created! - Jack (talk) 23:53, 7 August 2006 (UTC)
Does this material turn into glass when heated? C'uzz i have no idea.
Technically you can as normal sand is used to make glass and sand is mostly made Ou of silicon dioxide Lolcat64 ( talk) 04:06, 18 April 2020 (UTC)
The Journal of Nutrition, Health, and Aging Vol 11(2) 2007 has a special symposium including an editorial and five articles on emerging data with respect to the health benefits of silica. According to articles, silica is the second most prevalent element after oxygen. Articles refer to compelling data suggesting that silica is essential for health.
What's supposed to be linked at the MSDS link in the info box? Donald Hosek 23:45, 25 June 2007 (UTC)
I see that a mention of use in bottled water has been removed following this revision. I'm not sure why it was removed, but I know for sure that silicon dioxide can be found in mineral water (at least the one I drink - Naleczowianka), and it's listed under Mineral Content, so it's probably somewhat significant. 36 mg/L of SiO2 in the mentioned mineral water. I will revert back to the older edit and add additional info if no one minds. Aurimas 08:11, 12 September 2007 (UTC)
You'd think that it being the most common compound in the crust would make it notable. Although I'm not really sure of this. Can anyone confirm this? -=Elfin=- 341 04:31, 4 October 2007 (UTC)
another name for sioSubscript text is silicon dioxide,silica, or silox they are there scientific names —Preceding unsigned comment added by 98.21.93.105 ( talk) 01:06, 15 March 2008 (UTC)
"Inhaling finely divided crystalline silica dust in very small quantities (OSHA allows 0.1mg/m3) over time can lead to silicosis, bronchitis or (much more rarely) cancer, ..."
Does this mean:
—? Cutler ( talk) 09:50, 21 April 2008 (UTC)
I came to this article to find out how safe it is to ingest food (or drugs) that have silica as an ingredient. (This applies to a large number of especially drugs, and I just purchased for the first time a diet drink -- in powdered form -- with silica as an ingredient.)
My only concern was that the silica particles might be jagged and irritate my digestive tract. Sure enough, the article confirms this potential hazard:
"Small pieces of silicon dioxide are equally harmless, as long as they are not large enough to mechanically obstruct the GI tract, or jagged enough to lacerate its lining."
Thing is, this powdered product might have been pulverized by people blissfully unaware of what their processing might be doing to the shape of the silica particles, and I'd like to know this is not a risk before using it.
Does anyone have an idea whether jagged silica particles is is a realistic danger for food or drugs that are manufactured with silica as an ingredient?
If so, this would be well worth mentioning in the article.
P.S. Someone asked about the purpose of using silica as an ingredient in food products. My guess is that it has nothing to do with making the product "crunchy" (or if it did, we'd know that jagged silica particles is a real possibility!). Rather, I suspect it's used just as it is in silica gel packets: to keep the powder from becoming moist. (And therefore avoid clumping.) Daqu ( talk) 01:00, 6 September 2008 (UTC)
That's exactly what it is used for and is classified as an Anti-caking agent in many food additive lists. This article and most research out there seams to conclude that silica passes through us. I assume that in order to lacerate the lining it would have to be visibly jagged bits, along the lines of the glass splinters you can get embedded in your fingers while picking up a shattered tea cup. So my bet is that swallowing a cup of crushed silica is not the best idea but the pulverized powder, in the amounts present in food products / drug products, is ok.
Silox is often used as a shorthand name for (t-butyl)3SiO. It is the name of an industrial group. Is it also a name for silica? -- Axiosaurus ( talk) 09:02, 23 October 2008 (UTC)
Boiling and melting points are incorrect, according to the CRC 85th edition, which sites SiO2 has having a boiling point of 2950 degrees C and a melting point of 1470 (cristobalite). This is one of several mistakes I have run across on various minerals and compounds. I will try to correct others, soon.-- Sherlock rocks ( talk) 09:03, 11 December 2008 (UTC)
That CRC boiling point of 2950C is much higher than reported elsewhere; for example NIH gives 2230C here: https://pubchem.ncbi.nlm.nih.gov/compound/Silica#section=Boiling-Point
While OSHA gives 2447C here: https://www.osha.gov/dts/sltc/methods/inorganic/id142/id142.pdf
I have a hard time explaining this wide variation (could the higher CRC number be for chemically pure material rather than naturally occurring silicates?). -- 216.67.10.12 ( talk) 23:12, 29 December 2018 (UTC)
Hi
Can any one tell me if I can use the sand in my fishpond filter —Preceding unsigned comment added by 41.30.241.103 ( talk) 06:24, 25 April 2009 (UTC)
Can anyone please tel me whether SiO2 is acidic, basic or amphoteric? —Preceding unsigned comment added by Vigneshmanix ( talk • contribs) 13:56, 25 November 2009 (UTC)
-- 58.38.41.98 ( talk) 05:55, 10 April 2010 (UTC)
-- 58.38.41.98 ( talk) 05:59, 10 April 2010 (UTC)
The brief paragraph in health effects added in March 09 needs clarification/rewording.
I can't access the reference used for verification. The implication is that 100mg/day intake would reverse dementia -- gimme some. Vsmith ( talk) 12:57, 21 May 2010 (UTC)
The risk of dementia was higher for subjects with a high daily aluminum intake (for intake 0.1 mg/day, adjusted relative risk (RR) = 2.26, P = 0.049; model 5, Table 4). Conversely, an increase of 10 mg/day in silica intake was associated with a reduced risk of dementia (adjusted RR = 0.89, P = 0.036; model 5). No tendency toward a dose response effect for aluminum was apparent (likelihood ratio statistic = 3.52 (3 df), P = 0.32; model 7, Table 4), even though a significant linear relation between aluminum and dementia was obtained in model 6 (for an increase of 0.1 mg/day, adjusted RR for aluminum = 1.28; P = 0.017). Model 6, with aluminum entered as a continuous variable, was slightly better than model 5, in which aluminum was divided into 2 classes (difference in Akaike’s Information Criterion = 1.1). There was no significant interaction between aluminum and silica concentrations.
I hope i'm not embarrassingly wrong but on checking I think there has been a misunderstanding of how to interpret the SiO2 stoichiometry:
In each of the most thermodynamically stable crystalline forms of silica, on average, only 2 out of 4 of each the vertices (or oxygen atoms) of the SiO4 tetrahedra are shared with others, yielding the net chemical formula: SiO2.[4]
This is entirely wrong as far as I know. In SiO2 all oxygens must be shared between two Si atoms to achieve the stoichiometry. Each O bonded to two Si atoms is effectively makes up 1/2 if we were base SiO2 on the smallest repeating unit, hence all 4 are crosslinked. I've made the appropriate changes anyway- i'm merely commenting on here to draw to attention if i'm wrong. —Preceding unsigned comment added by 131.111.243.37 ( talk) 22:12, 22 May 2010 (UTC)
In the introduction, there is a random plug for silica nanosprings. It is out of place in the general context of the introduction and seems to be for nothing more than to promote a group's work. Recommend deletion. 99.255.24.249 ( talk) 06:23, 1 February 2011 (UTC)
alpha-quartz is listed as s.g.#152, whereas http://cst-www.nrl.navy.mil/lattice/spcgrp/trigonal.html#sg154 says its #154. I don't have access to literature to check at the moment, can anybody confirm? Thanks. 12.104.156.31 ( talk) 00:27, 17 December 2011 (UTC)
What is molten silicon dioxide's density at melting point? This info should be in the article. UNIT A4B1 ( talk) 22:09, 25 April 2012 (UTC)
This picture shows 4 oxygens!!!! it needs to show 2. (Unless I missed the point of this picture!) Creeper jack1 ( talk) 19:13, 1 February 2013 (UTC)
The passage on solubility is confusing, as it says that silica is more soluble than quartz. But elsewhere it is said (correctly) that quartz is a form (in fact, one of the most common forms) of silica. So presumably what is meant is that some other forms of silica are more soluble than quartz, in which case it would be useful to sya which they are. 109.158.46.214 ( talk) 22:13, 12 April 2013 (UTC)
It is stated that silicon dioxide (silica) is a primary ingredient in industrial Portland cement. Is there a source for this? As I understand it Portland cement is manufactured from limestone (calcium carbonate), clay minerals, and gypsum (in that order). If available, a limestone already containing a suitable proportion of clay minerals is used; otherwise, clay is added to the mixture. I am not aware that silica in free form (e.g. sand) is ever added to the mixture. (Of course, silica sand is usually part of the aggregate used in concrete, but not the cement itself.) Clay minerals themselves are complex aluminum-silicate compounds, so I suppose you could say that they contain silica, but I don't think silica would usually be recognisable as a distinct component. 109.158.46.214 ( talk) 22:33, 12 April 2013 (UTC)
In the section "Uses", paragraph 4, it is stated that silica is an insulator, but also that it stores electrical charge.
To store charge for electrical use requires both an insulator and conductors to form a capacitor, so is the statement correct ?
An explanation would be appropriate please, any offers ? Darkman101 ( talk) 07:54, 20 September 2013 (UTC)
Hello, here the Jmol interactive 3D Image is irrelevant, because it represents the SiO2 diatomic molecule, not any of the crystalline forms of silica. Do we have the correct one? Nicola.Manini ( talk) 17:33, 17 December 2015 (UTC)
|SMILES=
input, and the Jmol link is using that input so now Jmol is gone too. -
DePiep (
talk)
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The Plate tectonics article mentions in passing that silica and water form a deep eutectic system. Does some elaboration belong here? I have also placed a similar comment at the talk page at eutectic system. — Theodore Kloba ( ☎) 14:14, 20 September 2017 (UTC)
"as a function of temperature, it peaks around 340 °C.[49]" [49]= http://www.minsocam.org/ammin/AM62/AM62_1052.pdf which states "The solubility of amorphous silica at the vapor pressure of the solution, from 0° to 250° C, is given by the equation log C = -731/T + 4.52, where C is the silica concentration in mg/kg and T is absolute temperature. The maximum solubility at the vapor pressure of solution is 1660 mg/kg at 340°C, and the extrapolated solubility at the critical point is 890 mg/kg. At a constant pressure of 1034 bars, the solubility of amorphous silica from 0° to °C is given by the equation log C = -8102 + 4.82."
As it says, that is the "maximum solubility at the vapor pressure". The equation is in regards to the vapor pressure. If you look at the data they got the max solubility is actually between 4000 and 7000 PPM (4 g/L and 7 g/L): http://www.minsocam.org/msa/AmMin/Supplemental_Data/Vol%2062%20p1052%20AM-77-051.pdf (mentioned in [49] as "AM-77-051"). -- User123o987name ( talk) 14:56, 25 March 2020 (UTC)
In the polymorphism section, with the caption "Typical subunit for low pressure silicon dioxide", the diagram is completely wrong. The silicons at the bottom of the "pyramid", so to speak, are connected by oxygens. This should not be the case. Each silicon should bond tetrahedrally, with the Si-O bonds pointing downwards from the Si, and then presumably going off the edge of the diagram. Silicons should not be bonded to other silicons on the same layer of the crystal structure. As it is, the depicted molecule cannot form a crystal structure. Humanoid-human-5 ( talk) 04:55, 10 January 2023 (UTC)
I think that you are trying to say that individual Si4O10 cages are not found in low pressure forms of silicon dioxide? -- Smokefoot ( talk) 13:59, 10 January 2023 (UTC)
silica(Silicon dioxide-SO2) 119.93.39.194 ( talk) 01:21, 19 May 2023 (UTC)
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Can you please tell me why I would find Silicon dioxide in the ingredients list on a packet of food and how safe is it to consume?
I second this -- Plonk420 22:09, 19 Apr 2005 (UTC)
While I'm not sure why it exactly would be an *additive*, I do know that many people commonly ingest it - in the form of vegetables. Silica is fairly common in plant cell walls. One study I know of (there might be more) suggests that silicon dioxide may help lower cholesterol [1]. Of course, I doubt that that's what Burger King had in mind. One theory says that silica is added to increase the crunch in, say, pies or burgers. Silica is poorly absorbed by the body, so it shouldn't be too much of an issue (and again, it's commonly found in edible plants). Im guessing that the danger with eating those silica gel packets found in beef jerky packages and other snacks (used to keep the pack dry) is the possibility of *inhaling* it. That would cause silicosis, which would be bad. As a food additive, it *should* be stuck on food well enought that inhalation shouldn't be a problem. bluemonq 23:26, 7 May 2006 (UTC)
-It is used as a drying agent in powdered typed foods. — Preceding unsigned comment added by 2601:187:4000:DDBF:A4EE:126:6A5F:2DD5 ( talk) 12:58, 7 June 2017 (UTC)
says "& Not more than 2% Silicon Dioxide added (as an anti-caking agent)" It also appears again in the same list saying "Not more than 2% each of Calcim Silicate & Silicon Dioxide added (as an anti-caking agent)" 74.67.65.212 ( talk) 18:06, 07 Dec 2008 (UTC)
Inhaling crystalline silica DUST can cause silicosis. The gel packets dont have dust, they typically have beads. If you want to see why you should not eat them, pour a fresh dry pack of the beads into water and watch them explode...
Speaking of all this, the Burger King page was a little bothersome, and the SiO2 was hard to find mentioned- would somebody perhaps just compile a list or something so that we wouldn't have to look so hard or pick on Burger King?-- Honalululand 20:47, 16 January 2007 (UTC)
When Companies mess up and add too much Silicon dioxide people get pretty sick. My 1 year son went to the hospital over night when we was throwing up. I looked on the ingredients list and saw Silicon dioxide. I thought in my head,"why do they have silicon in food?". Vstmassie ( talk) 17:09, 23 April 2008 (UTC)
Please do not take this the wrong way but maybe it was something else that made your little boy sick? Cross contamination of prep surfaces, not sufficiently sanitized containers or hands or something quite other and random (children get stomach upsets and do vomit on occasion.) It's highly unlikely that it was due to too much "silicon" in his food. As to why it is in Nestea mix it is as an anti-caking agent, it prevents "clumping" and hardening of the powder due to exposure to air (moisture.) That is it's primary purpose when added to foods and then it seems to mostly be used in powdered and dehydrated items.) —Preceding unsigned comment added by 68.153.130.132 ( talk) 19:17, 30 January 2009 (UTC)
There seems to be some evidence of potential adverse health effects from ingestion. Eg https://pubmed.ncbi.nlm.nih.gov/25586546/ Not sure how to summarize that in the article Raisins31415 ( talk) 15:55, 2 April 2021 (UTC)
Silica is now being used in motorcycle tire manufacturing. It makes the tires more compliant and temperature stable. This lets manufacturers make tires that grip better and still handle loads, without excessive wear from higher temperatures. It also affects wet weather traction. 2601:8:AA00:2DC:CD6:966F:8156:F87B ( talk) 03:30, 23 April 2015 (UTC)edited for spelling and homophones by Wendy Neumeyer Silicon dioxide is insolble in water where as it can be disolved in HF to produce hydro flouro silisic acid [HSiF6] which is used as itching of glass — Preceding unsigned comment added by 106.76.236.3 ( talk) 05:50, 8 December 2020 (UTC)
Please outline some of the basic reactions that silica gel is likely to undergo, especially those relating to the preparation of the products listed in the page. could you also include a method for purifying the silica source into the final silica product.
Please come to my job and do it for me so I can stay at home and throw food at my wall. —Preceding unsigned comment added by 192.198.151.130 ( talk) 10:45, 21 February 2008 (UTC)
silicon dioxide do not dissolve in water where as it can be dissolved in hydrogen flouride[common formulae HF] to produce hydrofloro silisic acid [h2sif6] which is used as an agent for itching of glass — Preceding unsigned comment added by 106.76.236.3 ( talk) 05:54, 8 December 2020 (UTC)
Isn't it a good thing to have silica in shampoo? But what does it do in it? 71.250.17.62 02:20, 17 June 2006 (UTC)
As far as I know there is no free silicon in nature, but silicon is in oxidized form; in silicon dioxide (quartz etc.) or in complex oxides with metals (silicates). So there is little to happen (chemically) for silicon in a fire or in a lightning. I removed the fires and strokes of lightning producing silicon dioxide(and fulgurites added there afterwards). -- AB-fi 18:29, 11 July 2006 (UTC)
How soluble is silicon dioxide? My chemistry teacher told me to always remember nothing is insoluble. That, in water (an excellent solvent) everything disolves a bit. Even gold, plastics and, yup, sand. So whats the figure? It should be included in the table, along with any solvent it dissolves in strongly enough in to be consideded actually quite soluble. I would love to find something that will dissolve the beakers in which it was created! - Jack (talk) 23:53, 7 August 2006 (UTC)
Does this material turn into glass when heated? C'uzz i have no idea.
Technically you can as normal sand is used to make glass and sand is mostly made Ou of silicon dioxide Lolcat64 ( talk) 04:06, 18 April 2020 (UTC)
The Journal of Nutrition, Health, and Aging Vol 11(2) 2007 has a special symposium including an editorial and five articles on emerging data with respect to the health benefits of silica. According to articles, silica is the second most prevalent element after oxygen. Articles refer to compelling data suggesting that silica is essential for health.
What's supposed to be linked at the MSDS link in the info box? Donald Hosek 23:45, 25 June 2007 (UTC)
I see that a mention of use in bottled water has been removed following this revision. I'm not sure why it was removed, but I know for sure that silicon dioxide can be found in mineral water (at least the one I drink - Naleczowianka), and it's listed under Mineral Content, so it's probably somewhat significant. 36 mg/L of SiO2 in the mentioned mineral water. I will revert back to the older edit and add additional info if no one minds. Aurimas 08:11, 12 September 2007 (UTC)
You'd think that it being the most common compound in the crust would make it notable. Although I'm not really sure of this. Can anyone confirm this? -=Elfin=- 341 04:31, 4 October 2007 (UTC)
another name for sioSubscript text is silicon dioxide,silica, or silox they are there scientific names —Preceding unsigned comment added by 98.21.93.105 ( talk) 01:06, 15 March 2008 (UTC)
"Inhaling finely divided crystalline silica dust in very small quantities (OSHA allows 0.1mg/m3) over time can lead to silicosis, bronchitis or (much more rarely) cancer, ..."
Does this mean:
—? Cutler ( talk) 09:50, 21 April 2008 (UTC)
I came to this article to find out how safe it is to ingest food (or drugs) that have silica as an ingredient. (This applies to a large number of especially drugs, and I just purchased for the first time a diet drink -- in powdered form -- with silica as an ingredient.)
My only concern was that the silica particles might be jagged and irritate my digestive tract. Sure enough, the article confirms this potential hazard:
"Small pieces of silicon dioxide are equally harmless, as long as they are not large enough to mechanically obstruct the GI tract, or jagged enough to lacerate its lining."
Thing is, this powdered product might have been pulverized by people blissfully unaware of what their processing might be doing to the shape of the silica particles, and I'd like to know this is not a risk before using it.
Does anyone have an idea whether jagged silica particles is is a realistic danger for food or drugs that are manufactured with silica as an ingredient?
If so, this would be well worth mentioning in the article.
P.S. Someone asked about the purpose of using silica as an ingredient in food products. My guess is that it has nothing to do with making the product "crunchy" (or if it did, we'd know that jagged silica particles is a real possibility!). Rather, I suspect it's used just as it is in silica gel packets: to keep the powder from becoming moist. (And therefore avoid clumping.) Daqu ( talk) 01:00, 6 September 2008 (UTC)
That's exactly what it is used for and is classified as an Anti-caking agent in many food additive lists. This article and most research out there seams to conclude that silica passes through us. I assume that in order to lacerate the lining it would have to be visibly jagged bits, along the lines of the glass splinters you can get embedded in your fingers while picking up a shattered tea cup. So my bet is that swallowing a cup of crushed silica is not the best idea but the pulverized powder, in the amounts present in food products / drug products, is ok.
Silox is often used as a shorthand name for (t-butyl)3SiO. It is the name of an industrial group. Is it also a name for silica? -- Axiosaurus ( talk) 09:02, 23 October 2008 (UTC)
Boiling and melting points are incorrect, according to the CRC 85th edition, which sites SiO2 has having a boiling point of 2950 degrees C and a melting point of 1470 (cristobalite). This is one of several mistakes I have run across on various minerals and compounds. I will try to correct others, soon.-- Sherlock rocks ( talk) 09:03, 11 December 2008 (UTC)
That CRC boiling point of 2950C is much higher than reported elsewhere; for example NIH gives 2230C here: https://pubchem.ncbi.nlm.nih.gov/compound/Silica#section=Boiling-Point
While OSHA gives 2447C here: https://www.osha.gov/dts/sltc/methods/inorganic/id142/id142.pdf
I have a hard time explaining this wide variation (could the higher CRC number be for chemically pure material rather than naturally occurring silicates?). -- 216.67.10.12 ( talk) 23:12, 29 December 2018 (UTC)
Hi
Can any one tell me if I can use the sand in my fishpond filter —Preceding unsigned comment added by 41.30.241.103 ( talk) 06:24, 25 April 2009 (UTC)
Can anyone please tel me whether SiO2 is acidic, basic or amphoteric? —Preceding unsigned comment added by Vigneshmanix ( talk • contribs) 13:56, 25 November 2009 (UTC)
-- 58.38.41.98 ( talk) 05:55, 10 April 2010 (UTC)
-- 58.38.41.98 ( talk) 05:59, 10 April 2010 (UTC)
The brief paragraph in health effects added in March 09 needs clarification/rewording.
I can't access the reference used for verification. The implication is that 100mg/day intake would reverse dementia -- gimme some. Vsmith ( talk) 12:57, 21 May 2010 (UTC)
The risk of dementia was higher for subjects with a high daily aluminum intake (for intake 0.1 mg/day, adjusted relative risk (RR) = 2.26, P = 0.049; model 5, Table 4). Conversely, an increase of 10 mg/day in silica intake was associated with a reduced risk of dementia (adjusted RR = 0.89, P = 0.036; model 5). No tendency toward a dose response effect for aluminum was apparent (likelihood ratio statistic = 3.52 (3 df), P = 0.32; model 7, Table 4), even though a significant linear relation between aluminum and dementia was obtained in model 6 (for an increase of 0.1 mg/day, adjusted RR for aluminum = 1.28; P = 0.017). Model 6, with aluminum entered as a continuous variable, was slightly better than model 5, in which aluminum was divided into 2 classes (difference in Akaike’s Information Criterion = 1.1). There was no significant interaction between aluminum and silica concentrations.
I hope i'm not embarrassingly wrong but on checking I think there has been a misunderstanding of how to interpret the SiO2 stoichiometry:
In each of the most thermodynamically stable crystalline forms of silica, on average, only 2 out of 4 of each the vertices (or oxygen atoms) of the SiO4 tetrahedra are shared with others, yielding the net chemical formula: SiO2.[4]
This is entirely wrong as far as I know. In SiO2 all oxygens must be shared between two Si atoms to achieve the stoichiometry. Each O bonded to two Si atoms is effectively makes up 1/2 if we were base SiO2 on the smallest repeating unit, hence all 4 are crosslinked. I've made the appropriate changes anyway- i'm merely commenting on here to draw to attention if i'm wrong. —Preceding unsigned comment added by 131.111.243.37 ( talk) 22:12, 22 May 2010 (UTC)
In the introduction, there is a random plug for silica nanosprings. It is out of place in the general context of the introduction and seems to be for nothing more than to promote a group's work. Recommend deletion. 99.255.24.249 ( talk) 06:23, 1 February 2011 (UTC)
alpha-quartz is listed as s.g.#152, whereas http://cst-www.nrl.navy.mil/lattice/spcgrp/trigonal.html#sg154 says its #154. I don't have access to literature to check at the moment, can anybody confirm? Thanks. 12.104.156.31 ( talk) 00:27, 17 December 2011 (UTC)
What is molten silicon dioxide's density at melting point? This info should be in the article. UNIT A4B1 ( talk) 22:09, 25 April 2012 (UTC)
This picture shows 4 oxygens!!!! it needs to show 2. (Unless I missed the point of this picture!) Creeper jack1 ( talk) 19:13, 1 February 2013 (UTC)
The passage on solubility is confusing, as it says that silica is more soluble than quartz. But elsewhere it is said (correctly) that quartz is a form (in fact, one of the most common forms) of silica. So presumably what is meant is that some other forms of silica are more soluble than quartz, in which case it would be useful to sya which they are. 109.158.46.214 ( talk) 22:13, 12 April 2013 (UTC)
It is stated that silicon dioxide (silica) is a primary ingredient in industrial Portland cement. Is there a source for this? As I understand it Portland cement is manufactured from limestone (calcium carbonate), clay minerals, and gypsum (in that order). If available, a limestone already containing a suitable proportion of clay minerals is used; otherwise, clay is added to the mixture. I am not aware that silica in free form (e.g. sand) is ever added to the mixture. (Of course, silica sand is usually part of the aggregate used in concrete, but not the cement itself.) Clay minerals themselves are complex aluminum-silicate compounds, so I suppose you could say that they contain silica, but I don't think silica would usually be recognisable as a distinct component. 109.158.46.214 ( talk) 22:33, 12 April 2013 (UTC)
In the section "Uses", paragraph 4, it is stated that silica is an insulator, but also that it stores electrical charge.
To store charge for electrical use requires both an insulator and conductors to form a capacitor, so is the statement correct ?
An explanation would be appropriate please, any offers ? Darkman101 ( talk) 07:54, 20 September 2013 (UTC)
Hello, here the Jmol interactive 3D Image is irrelevant, because it represents the SiO2 diatomic molecule, not any of the crystalline forms of silica. Do we have the correct one? Nicola.Manini ( talk) 17:33, 17 December 2015 (UTC)
|SMILES=
input, and the Jmol link is using that input so now Jmol is gone too. -
DePiep (
talk)
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The Plate tectonics article mentions in passing that silica and water form a deep eutectic system. Does some elaboration belong here? I have also placed a similar comment at the talk page at eutectic system. — Theodore Kloba ( ☎) 14:14, 20 September 2017 (UTC)
"as a function of temperature, it peaks around 340 °C.[49]" [49]= http://www.minsocam.org/ammin/AM62/AM62_1052.pdf which states "The solubility of amorphous silica at the vapor pressure of the solution, from 0° to 250° C, is given by the equation log C = -731/T + 4.52, where C is the silica concentration in mg/kg and T is absolute temperature. The maximum solubility at the vapor pressure of solution is 1660 mg/kg at 340°C, and the extrapolated solubility at the critical point is 890 mg/kg. At a constant pressure of 1034 bars, the solubility of amorphous silica from 0° to °C is given by the equation log C = -8102 + 4.82."
As it says, that is the "maximum solubility at the vapor pressure". The equation is in regards to the vapor pressure. If you look at the data they got the max solubility is actually between 4000 and 7000 PPM (4 g/L and 7 g/L): http://www.minsocam.org/msa/AmMin/Supplemental_Data/Vol%2062%20p1052%20AM-77-051.pdf (mentioned in [49] as "AM-77-051"). -- User123o987name ( talk) 14:56, 25 March 2020 (UTC)
In the polymorphism section, with the caption "Typical subunit for low pressure silicon dioxide", the diagram is completely wrong. The silicons at the bottom of the "pyramid", so to speak, are connected by oxygens. This should not be the case. Each silicon should bond tetrahedrally, with the Si-O bonds pointing downwards from the Si, and then presumably going off the edge of the diagram. Silicons should not be bonded to other silicons on the same layer of the crystal structure. As it is, the depicted molecule cannot form a crystal structure. Humanoid-human-5 ( talk) 04:55, 10 January 2023 (UTC)
I think that you are trying to say that individual Si4O10 cages are not found in low pressure forms of silicon dioxide? -- Smokefoot ( talk) 13:59, 10 January 2023 (UTC)
silica(Silicon dioxide-SO2) 119.93.39.194 ( talk) 01:21, 19 May 2023 (UTC)