Related articles - polarity of silica gel
- Silica gel is an amorphous and porous form of silicon dioxide (silica), consisting of an irregular tridimensional framework of....
- Dec 21，2023
|
| | Colloidal Silica Basic information |
| Product Name: | Colloidal Silica | | Synonyms: | SILICA GEL 60 FOR COLUMN CHROMATOGRAPHY 0.2-0.5 MM;SILICA GEL MERCK GRADE 9385 230-400 &;SILICA GEL MERCK TLC GRADE 11695 WIT&;SILICA GEL H FOR TLC WITHOUT CASO4;SILICA GEL 60 F(254) FOR COLUMN CHROMAT. 0.063-0.2 MM;SILICA GEL MERCK GRADE 60 70-230 MES&;SILICA GEL MERCK TLC GRADE 11678 WITH&;SILICA GEL, HIGH-PURITY GRADE/70-230 MES H, 60 ANGSTROM/FOR COLUMN CHROMATOGRAPHY | | CAS: | 112926-00-8 | | MF: | O2Si | | MW: | 60.0800018310547 | | EINECS: | 601-214-2 | | Product Categories: | Silica TLC Adsorbent, with binder, no indicator;Bulk Adsorbents for TLC;Silica TLC Adsorbent, no binder, no fluorescent indicator;Silica TLC Adsorbents;SilicaBulk Adsorbents for TLC;Davisil GradesResins&LC Separation Media;Davisil Silica;Essential Chemicals;Fluka brand Silica, TLC Adsorbent;Silica TLC Adsorbent, with fluorescent indicator, no binder;Silica Gels;Davisil SilicaEssential Chemicals;Resins&LC Separation Media;Adsorbents (Inorganic);LPLC Separation Media;Silica;Silica Gels;Desiccators and Desiccants;Desiccants;Labware;metals scavenging agent;supported alkali metal;UVCBs-inorganic;Other Silica Gels;Fluka brand Silica, TLC AdsorbentBulk Adsorbents for TLC | | Mol File: | Mol File | ![Colloidal Silica Structure]() |
| | Colloidal Silica Chemical Properties |
| Melting point | 1610°C | | Boiling point | 2230℃ | | density | 2.6 | | Fp | 23°C | | storage temp. | 2-8°C | | form | powder or granules | | Specific Gravity | 0.88g/ml | | color | blue | | Odor | Odorless | | PH Range | About 7.0 | | PH | ~6.8 (10% in aq. suspension) | | Water Solubility | Insoluble in water | | Hydrolytic Sensitivity | 6: forms irreversible hydrate | | Merck | 14,8493 | | CAS DataBase Reference | 112926-00-8 | | EPA Substance Registry System | Silica gel, pptd., cryst.-free (112926-00-8) |
| | Colloidal Silica Usage And Synthesis |
| Description |
In general terms, colloidal silica is a dispersion of amorphous silicon dioxide (silica) particles in water. These amorphous silica particles are produced by polymerizing silica nuclei from silicate solutions under alkaline conditions to form nanometer-sized silica sols with high surface area. A charge is then induced on the silica nanoparticle surface, allowing the silica particles to repel one another and form a stable dispersion, or colloid.
| | Chemical Properties |
Colloidal silicas are produced in a variety of grades that range in several factors. Particle size typically varies from 5nm to 40nm, and particle size distribution can vary from narrow to wide depending on the manufacturing process. Standard colloidal silica is stable at a pH of 8 - 10.5 and carries an anionic surface charge that is stabilized with sodium or ammonium. In certain grades, some silicon atoms in the silica particle are replaced with aluminate ions to enhance stability in a wider pH range, usually 3.5 - 10.5.
| | Application | Colloidal silica is extensively used as a rheological additive in personal care products to control flowability. Recently, mesoporous silica nanoparticles have been explored as nanocarriers for delivering drugs and genes. Silica nanoparticles possess a wide range of particle sizes, controllable pore volumes, a high drug-loading capacity, and abundant silanol groups for surface modification and functionalization, and they have been widely used in drug delivery. Increasing efforts have been made to investigate their skin penetration ability and toxicity.
|
| | Colloidal Silica Preparation Products And Raw materials |
|