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Silicon dioxide, also known as silica, is one of the most important and abundant oxides on Earth, constituting about 60% of the Earth's crust as silica itself or in combination with other metal oxides in silicates. It commonly occurs as sand in ocean and river shores, deserts, rocks, and minerals, and exists in several structural forms, including polymorphic crystalline silica, synthetic quartz crystals, amorphous silica, and vitreous silica.

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  • 7631-86-9 Structure
  • Basic information

    1. Product Name: Silicon dioxide
    2. Synonyms: SILICA GEL 60 PF254 FOR PREPARATIVE LAYE;LICHROSORB SI 100 (10 MYM) 10 G;TLC-SILICA GEL 60 GF254 MEAN PARTICLE SI;LICHROSORB SI 100 (10 MYM) 100 G;SEA SAND EXTRA PURE 5 KG;SILICA GEL 60 GF254 FOR THIN-LAYER CHROM;SILICA GEL 60 PF254 + 366 FOR PREPARATIV;SEA SAND EXTRA PURE 25 KG
    3. CAS NO:7631-86-9
    4. Molecular Formula: O2Si
    5. Molecular Weight: 60.08
    6. EINECS: 231-545-4
    7. Product Categories: #N/A;Siloxanes;Inorganics;Silica Gels;organofunctional catalyst support;metals scavenging agent;molecular sieves;metal oxide;Mesoporous Materials;Ceramic Science;Materials Science;Metal &Nanomaterials;New Products for Materials Research and Engineering
    8. Mol File: 7631-86-9.mol
    9. Article Data: 902
  • Chemical Properties

    1. Melting Point: >1600 °C(lit.)
    2. Boiling Point: >100 °C(lit.)
    3. Flash Point: 2230°C
    4. Appearance: White to yellow/suspension
    5. Density: 2.2-2.6 g/mL at 25 °C
    6. Vapor Pressure: 13.3hPa at 1732℃
    7. Refractive Index: 1.46
    8. Storage Temp.: Refrigerator (+4°C)
    9. Solubility: Practically insoluble in water and in mineral acids except hydrofluoric acid. It dissolves in hot solutions of alkali hydroxides.
    10. PKA: 6.65-9.8[at 20 ℃]
    11. Water Solubility: insoluble
    12. Sensitive: Hygroscopic
    13. Stability: Stable.
    14. Merck: 14,8493
    15. CAS DataBase Reference: Silicon dioxide(CAS DataBase Reference)
    16. NIST Chemistry Reference: Silicon dioxide(7631-86-9)
    17. EPA Substance Registry System: Silicon dioxide(7631-86-9)
  • Safety Data

    1. Hazard Codes: Xn,Xi
    2. Statements: 36/37/38-36/37-22-43-52/53-36/38
    3. Safety Statements: 26-37/39-36-36/37/39-36/37-61
    4. WGK Germany: 1
    5. RTECS: VV7310000
    6. TSCA: Yes
    7. HazardClass: N/A
    8. PackingGroup: N/A
    9. Hazardous Substances Data: 7631-86-9(Hazardous Substances Data)

7631-86-9 Usage

Uses

Used in Food Industry:
Silicon dioxide is used as an ant-caking agent in powdered foods, such as salt and many spices, preventing the ingredients from binding together.
Used in Nutritional Health Food Supplements:
Silicon dioxide serves as a source of silicon, which helps maintain healthy strong bones and joints and minimizes aluminum effects on the body.
Used in Wine, Beer, and Juice Industry:
It acts as a fining agent in the clarification of wines, beers, and juices.
Used in Chemical Manufacture:
Silicon dioxide is used as a raw material in the manufacture of silicon compounds and sodium silicate.
Used in Construction:
It is a raw material in the production of portland cement.
Used in Sand Casting:
Silicon dioxide serves as the main ingredient due to its high melting point.
Used in Glass Industry:
It is a raw material for high purity silica glass, offering high temperature and corrosion resistance.
Used in Domestic Glass and Optical Devices:
Silicon dioxide is an essential component in these applications.
Used in Ceramics:
It is a main constituent in the manufacture of ceramic glaze, forming glass when heated to bind other ingredients together.
Used in Metallurgy:
Silicon dioxide is used as a raw material or additive in the manufacture of silicon alloys.
Used in Pharmaceutical Industry:
It functions as a flow agent in drug tablet making, aiding powder flow when tablets are formed.
Used in Electronics:
Silicon dioxide is used as a raw material in the production of fiber optic cables, offering high levels of heat conductivity and low rates of transmission loss. It is also used in wire insulation due to its high melting point and good insulating properties, and as a source of silicon in semi-conductors and piezoelectric transducers.
Used in Others:
Silicon dioxide is a main component in refractory materials, rubber and plastics as an additive, silica gel manufacturing, defoaming, and as a thickening agent in hydraulic fracturing.
Used in Agricultural Applications:
Silicon dioxide is used as a filler in fertilizers and in the manufacture of glass, ceramics, abrasives, rubber, and cosmetics.

Hazard

Not toxic if ingested, inhaled silica dust can cause silicosis; carcinogen.

Safety Profile

The pure unaltered form is considered a nuisance dust. Some deposits contain small amounts of crystahne quartz and are therefore fibrogenic. When diatomaceous earth is calcined (with or without fluxing agents) some sdica is converted to cristobalite and is therefore fibrogenic. Tridymite has never been detected in calcined batomaceous earth. See also other silica entries

Check Digit Verification of cas no

The CAS Registry Mumber 7631-86-9 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 7,6,3 and 1 respectively; the second part has 2 digits, 8 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 7631-86:
(6*7)+(5*6)+(4*3)+(3*1)+(2*8)+(1*6)=109
109 % 10 = 9
So 7631-86-9 is a valid CAS Registry Number.
InChI:InChI=1/O2Si/c1-3-2

7631-86-9 Well-known Company Product Price

  • Brand
  • (Code)Product description
  • CAS number
  • Packaging
  • Price
  • Detail
  • Alfa Aesar

  • (10856)  Silicon(IV) oxide, Puratronic?, 99.999% (metals basis)   

  • 7631-86-9

  • 25g

  • 1683.0CNY

  • Detail
  • Alfa Aesar

  • (10856)  Silicon(IV) oxide, Puratronic?, 99.999% (metals basis)   

  • 7631-86-9

  • 100g

  • 3216.0CNY

  • Detail
  • Alfa Aesar

  • (44386)  Silica gel desiccant, -3+8 Mesh Granules   

  • 7631-86-9

  • 250g

  • 134.0CNY

  • Detail
  • Alfa Aesar

  • (44386)  Silica gel desiccant, -3+8 Mesh Granules   

  • 7631-86-9

  • 1kg

  • 380.0CNY

  • Detail
  • Alfa Aesar

  • (44386)  Silica gel desiccant, -3+8 Mesh Granules   

  • 7631-86-9

  • 5kg

  • 1537.0CNY

  • Detail
  • Alfa Aesar

  • (44387)  Silica gel desiccant, -6+12 mesh granules   

  • 7631-86-9

  • 250g

  • 217.0CNY

  • Detail
  • Alfa Aesar

  • (44387)  Silica gel desiccant, -6+12 mesh granules   

  • 7631-86-9

  • 1kg

  • 554.0CNY

  • Detail
  • Alfa Aesar

  • (44387)  Silica gel desiccant, -6+12 mesh granules   

  • 7631-86-9

  • 5kg

  • 2361.0CNY

  • Detail
  • Alfa Aesar

  • (44389)  Silica gel desiccant, indicating, -6+16 mesh granules   

  • 7631-86-9

  • 250g

  • 190.0CNY

  • Detail
  • Alfa Aesar

  • (44389)  Silica gel desiccant, indicating, -6+16 mesh granules   

  • 7631-86-9

  • 1kg

  • 561.0CNY

  • Detail
  • Alfa Aesar

  • (44389)  Silica gel desiccant, indicating, -6+16 mesh granules   

  • 7631-86-9

  • 5kg

  • 2231.0CNY

  • Detail
  • Alfa Aesar

  • (40381)  Silica gel desiccant, indicating, ACS   

  • 7631-86-9

  • 100g

  • 411.0CNY

  • Detail

7631-86-9SDS

SAFETY DATA SHEETS

According to Globally Harmonized System of Classification and Labelling of Chemicals (GHS) - Sixth revised edition

Version: 1.0

Creation Date: Aug 12, 2017

Revision Date: Aug 12, 2017

1.Identification

1.1 GHS Product identifier

Product name silicon dioxide

1.2 Other means of identification

Product number -
Other names Silicon dioxide

1.3 Recommended use of the chemical and restrictions on use

Identified uses For industry use only.
Uses advised against no data available

1.4 Supplier's details

1.5 Emergency phone number

Emergency phone number -
Service hours Monday to Friday, 9am-5pm (Standard time zone: UTC/GMT +8 hours).

More Details:7631-86-9 SDS

7631-86-9Synthetic route

5-bromo-6-(imidazolin-2-ylamino)-quinoxaline
59803-98-4

5-bromo-6-(imidazolin-2-ylamino)-quinoxaline

SKF 190851
134892-42-5

SKF 190851

Conditions
ConditionsYield
In methanol86%
In methanol86%
In methanol86%
palladium (II) nitrate

palladium (II) nitrate

orthotelluric acid
7803-68-1

orthotelluric acid

Reaxys ID: 11464643

Reaxys ID: 11464643

Conditions
ConditionsYield
Stage #1: palladium (II) nitrate; orthotelluric acid; SiO2 In water
Stage #2: at 50 - 400℃; for 8h;
Stage #3: With hydrogen at 400℃; for 5h;
ZSM-5

ZSM-5

H-type ZSM-5(1)

H-type ZSM-5(1)

Conditions
ConditionsYield
With water at 750℃; for 4h;
aluminium trinitrate
7784-27-2

aluminium trinitrate

N,N,N',N'-tetramethylhexamethylenediamine
111-18-2

N,N,N',N'-tetramethylhexamethylenediamine

hydrogen fluoride
7664-39-3

hydrogen fluoride

water
7732-18-5

water

boric acid
11113-50-1

boric acid

N,N,N,N',N',N'-hexamethyl-1,6-hexanediammonium dihydroxide

N,N,N,N',N',N'-hexamethyl-1,6-hexanediammonium dihydroxide

silicate ITQ-13, boron form

silicate ITQ-13, boron form

coated solid pesticide B

coated solid pesticide B

coated solid pesticide A

coated solid pesticide A

coated solid pesticide C

coated solid pesticide C

composition D

composition D

5-bromo-2'-deoxyuridine
59-14-3

5-bromo-2'-deoxyuridine

5-amino-2'-deoxyuridine
5536-30-1

5-amino-2'-deoxyuridine

Conditions
ConditionsYield
With pyridine; sulfuric acid; ammonia In methanol; dichloromethane
maleic anhydride
108-31-6

maleic anhydride

p-phosphoric acid

p-phosphoric acid

cyclohexylamine
108-91-8

cyclohexylamine

N-cyclohexylmaleimide
1631-25-0

N-cyclohexylmaleimide

Conditions
ConditionsYield
In 5,5-dimethyl-1,3-cyclohexadiene
piperidine
110-89-4

piperidine

2,6-dihydroxylacetophenone
699-83-2

2,6-dihydroxylacetophenone

4-tert-Butylbenzaldehyde
939-97-9

4-tert-Butylbenzaldehyde

4'-tert-butyl-5-hydroxyflavanone

4'-tert-butyl-5-hydroxyflavanone

Conditions
ConditionsYield
With hydrogenchloride; boric acid In methanol; ethanol; diethylene glycol dimethyl ether; water; acetone11.1 g (40.0 mmol, 74%)
resquimod
144875-48-9

resquimod

triacetylglycerol
102-76-1

triacetylglycerol

7631-86-9Relevant articles and documents

Development of Highly Active Silica-Supported Nickel Phosphide Catalysts for Direct Dehydrogenative Conversion of Methane to Higher Hydrocarbons

Dipu, Arnoldus Lambertus,Nishikawa, Yuta,Inami, Yuta,Iguchi, Shoji,Yamanaka, Ichiro

, p. 199 - 212 (2021/04/19)

The direct dehydrogenative conversion of methane (DCM) to higher hydrocarbons was investigated over silica-supported nickel phosphide catalysts (NixPy/SiO2) over 1023?K. NixPy/SiO2 catalysts were prepared by precipitation method to promote formation of nickel phosphide (Ni2P) as an active phase for the DCM reaction. Characterization studies of the NixPy/SiO2 catalysts with different P/Ni molar ratios were conducted by a X-ray diffraction analysis, a H2-temperature-programmed reduction spectrum, a scanning electron microscopy image, a X-ray absorption spectroscopy and a N2-adsorption measurement. Catalytic activity tests for the DCM reaction were conducted using a conventional fixed-bed reactor. Products of C2H4 (ethylene), C2H6 (ethane), C2H2 (acetylene), C3H6 (propylene), C6H6 (benzene), C7H8 (toluene), C10H8 (naphthalene) and H2 were analyzed by GC-TCD and GC-FID instruments. Different degrees of the Ni2P phase and character were observed for the NixPy/SiO2 catalysts from characterization studies. Data from characterization studies indicated that smaller and dispersed Ni2P particles were obtained by precipitation method as compared to that of impregnation method. NixPy/SiO2 with a molar ratio of P/Ni = 3.0 showed optimum catalytic performance with 3.28% of methane conversion, 1.93% of total product yield, and 60% of selectivity to hydrocarbons. The experimental results of the effects of reaction temperatures on the product distributions and activation energies indicated that the Ni2P phase successfully activated the C–H bond of methane and selectively converted to ethane. Ethane thermally converted to other higher hydrocarbons in the gas phase without the participation of the catalyst. Graphic Abstract: [Figure not available: see fulltext.].

CYCLOBUTYL AMIDE MONOACYLGLYCEROL LIPASE MODULATORS

-

, (2022/03/31)

Compounds of Formula (I), and pharmaceutically acceptable salts, isotopes, N-oxides, solvates, and stereoisomers thereof, pharmaceutical compositions containing them, methods of making them, and methods of using them including methods for treating disease states, disorders, and conditions associated with MGL modulation, such as those associated with pain, psychiatric disorders, neurological disorders (including, but not limited to depression, major depressive disorder, treatment resistant depression, anxious depression, autism spectrum disorders, Asperger syndrome, and bipolar disorder), cancers and eye conditions: wherein R1, , R3, and L are as defined herein.

CROSSLINKED ARTIFICIAL NUCLEIC ACID ALNA

-

, (2022/01/12)

The present invention provides a novel bridged artificial nucleic acid and an oligomer containing the same as a monomer. The present invention provides specifically a compound represented by general formula (I) (wherein each symbol is the same as defined in the specification) or salts thereof; as well as an oligonucleotide compound represented by general formula (I′) (wherein each symbol is the same as defined in the specification) or salts thereof.

COMPOUND FOR INHIBITING PGE2/EP4 SIGNALING TRANSDUCTION INHIBITING, PREPARATION METHOD THEREFOR, AND MEDICAL USES THEREOF

-

, (2022/03/14)

A compound of formula (I), a preparation method therefor, a pharmaceutical composition containing a derivative thereof, and the therapeutic uses thereof, especially inhibiting PGE2/EP4 signalling transduction and the uses thereof for treating cancer, acute or chronic pain, migraine, osteoarthritis, rheumatoid arthritis, gout, bursitis, ankylosing spondylitis, primary dysmenorrhea, tumour or arteriosclerosis.

Non-Cryogenic, Ammonia-Free Reduction of Aryl Compounds

-

, (2022/03/31)

A method of reducing an aromatic ring or a cyclic, allylic ether in a compound includes preparing a reaction mixture including a compound including an aromatic moiety or a cyclic, allylic ether moiety, an alkali metal, and either ethylenediamine, diethylenetriamine, triethylenetetramine, or a combination thereof, in an ether solvent; and reacting the reaction mixture at from ?20° C. to 30° C. for a time sufficient to reduce a double bond in the aromatic moiety to a single bond or to reduce the cyclic, allylic ether moiety.

RhNPs supported onN-functionalized mesoporous silica: effect on catalyst stabilization and catalytic activity

Pulido-Díaz, Israel T.,Serrano-Maldonado, Alejandro,López-Suárez, Carlos César,Méndez-Ocampo, Pedro A.,Portales-Martínez, Benjamín,Gutiérrez-Alejandre, Aída,Salas-Martin, Karla P.,Guerrero-Ríos, Itzel

, p. 3289 - 3298 (2021/03/16)

Amine and nicotinamide groups grafted on ordered mesoporous silica (OMS) were investigated as stabilizers for RhNPs used as catalysts in the hydrogenation of several substrates, including carbonyl and aryl groups. Supported RhNPs on functionalized OMS were prepared by controlled decomposition of an organometallic precursor of rhodium under dihydrogen pressure. The resulting materials were characterized thoroughly by spectroscopic and physical techniques (FTIR, TGA, BET, SEM, TEM, EDX, XPS) to confirm the formation of spherical rhodium nanoparticles with a narrow size distribution supported on the silica surface. The use of nicotinamide functionalized OMS as a support afforded small RhNPs (2.3 ± 0.3 nm), and their size and shape were maintained after the catalyzed acetophenone hydrogenation. In contrast, amine-functionalized OMS formed RhNP aggregates after the catalytic reaction. The supported RhNPs could selectively reduce alkenyl, carbonyl, aryl and heteroaryl groups and were active in the reductive amination of phenol and morpholine, using a low concentration of the precious metal (0.07-0.18 mol%).

Catalytic hydrogenation of CO2from airviaporous silica-supported Au nanoparticles in aqueous solution

Lennox, R. Bruce,Li, Chao-Jun,Ni, Siting,Roy, Ranjan,Zhu, Jun

, p. 3740 - 3749 (2021/06/06)

The conversion of the ubiquitous greenhouse gas CO2to valuable organic products is much sought after. Herein, the hydrogenation of CO2to C1 products with an 80% yield in water is reported using a novel catalyst, porous-silica-supported Au nanoparticles (Au/SiO2). In the presence of a Lewis acid, boric acid, the Au/SiO2catalyst enables an efficient conversion of amine-captured CO2to methanol, formate, and formamide. A mechanistic study involving isotopic labelling suggests that methanol production in the catalytic process arises from the direct hydrogenation of formate. Most importantly, this one-pot, two-step process is able to convert CO2in air at ambient pressures to C1 products in the absence of an organic solvent. Furthermore, the catalyst is readily recycled without further purification or reactivation and shows no significant decrease in catalytic activity after four reaction cycles in a reusability test.

Effects of temperature on the structure of mesoporous silica materials templated with cationic surfactants in a nonhydrothermal short-term synthesis route

Borówka, Anna,Skrzypiec, Krzysztof

, (2021/05/03)

This paper reports the influence of synthesis temperature on the structure of mesoporous silica materials templated with ionic surfactant. The results obtained allow for the prediction of optimal temperature value to be used in nonhydrothermal short-term synthesis. The model materials were mesoporous silicates of MCM-41 type. The samples were prepared under alkaline conditions using tetraethyl orthosilicate as a silica source and cetyltrimethylammonium bromide or octadecyltrimethylammonium bromide as templates. An increase in synthesis temperature led to a rougher surface and decrease in the long-range ordering of the materials obtained, while a slight temperature decrease produced additional porosity. The reasons for these structural disturbances were briefly explained. The best material structure was obtained by synthesis at a temperature slightly higher than the Krafft temperature of surfactant of the porosity template.

In situthermosensitive hybrid mesoporous silica: preparation and the catalytic activities for carbonyl compound reduction

Ha, Chang-Sik,Mohan, Anandhu,Nagappan, Saravanan,Parambadath, Surendran,Park, Sung Soo,Peter, Jerome,Rout, Lipeeka,Thomas, Anju Maria,Zhang, Wei-Jin

, p. 11730 - 11741 (2021/09/06)

In this study, free-radical polymerisation inside MCM-41 mesopores was examined to expose a construction route for a temperature-responsive switchable polymer-silica nanohybrid material with well-defined porosity. Herein, we introduced a vinyl monomer (N-isopropyl acrylamide), a cross-linker, and an AIBN initiator into the palladium nanoparticle incorporated MCM-41 pore channels using the wet-impregnation method followed byin situradical polymerisation. The structural properties of the synthesised PNIPAM-PdNP-MCM-41 catalyst were analysed by various sophisticated analytical techniques. The temperature switchable nanohybrid catalyst was used to reduce carbonyl compounds to their corresponding alcohols. The catalyst showed high catalytic efficiency and robustness in an aqueous medium at 25 °C. Moreover, the system's polymer layer remarkably boosted catalytic selectivity and activity for carbonyl compound reduction as compared to other controlled catalysts. The suggested switchable system can be employed as a temperature-controllable heterogeneous catalyst and highlights a substitute technique to counter the methodical insufficiency in switchable supported molecular catalytic system production.

Effect of Mie resonance on photocatalytic hydrogen evolution over dye-sensitized hollow C-TiO2 nanoshells under visible light irradiation

Yao, Xiaxi,Hu, Xiuli,Cui, Yingying,Huang, Jialei,Zhang, Wenjun,Wang, Xuhong,Wang, Dawei

supporting information, p. 750 - 754 (2020/06/24)

Light utilization is one of the key factors for the improvement of photocatalytic performance. Herein, we design C-TiO2 hollow nanoshells with strong Mie resonance for enhanced photocatalytic hydrogen evolution in a dye-sensitized system under visible light irradiation (λ ≥ 420 nm). By tuning the inner diameters of hollow nanoshells, the Mie resonance in hollow nanoshells is adjusted for better excitation of dye molecules, which thus greatly enhances the light utilization in visible light region. This work shows the potential of Mie resonance in nanoshells can be an alternative strategy to increase the light utilization for photocatalysis.

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