1. Zvinokosha zveSilica Sol Chemistry uye Colloidal Kugadzikana
1.1 Make-up uye Particle Morphology
(Silica Sol)
Silica sol yakachengeteka colloidal diffusion inosanganisira amorphous silicon dioxide (SiO ₂) nanoparticles, kazhinji kubva 5 ku 100 nanometers mudhayamita, isai mubate muchinhanho chemvura– kazhinji mvura.
Aya nanoparticles anoumbwa neatatu-dimensional network yeSiO ₄ tetrahedra., kugadzira nzvimbo ine porous uye yakanyanya kuita reactive nzvimbo yakawanda mu silanol (Uye– OH) zvikwata zvinodzora maitiro ezviso.
Iyo sol mamiriro ndeye thermodynamically metastable, inochengetwa ne electrostatic repulsion pakati pezvimedu zvinochajiswa; pamusoro penzvimbo mubhadharo inokura kubva kune ionization yemapoka silanol, iyo inoderera pamusoro pepH ~ 2– 3, kugadzira zvimedu zvakashatiswa zvisina kunaka zvinodzivirirana.
Chimiro chechidimbu chinowanzo tenderera, kunyangwe matambudziko ekubatanidza anogona kukanganisa maitiro ekuunganidza uye kutenga kwenguva pfupi.
Iyo yakakwirira yepamusoro-nzvimbo-kusvika-vhoriyamu reshiyo– kazhinji kudarika 100 m TWO/ g– inoita kuti silica sol ipindure zvakanyanya, zvichiita kuti zvikwanise kusangana kwakasimba nemapolima, simbi, uye organic molecules.
1.2 Kudzikamisa Zvishandiso uye Gelation Shanduko
Colloidal kugadzikana mu silica sol inonyanya kudzorwa nekuenzana pakati pevan der Waals zvinobata ziso zvinomanikidza uye electrostatic repulsion., inotsanangurwa neDLVO (Derjaguin– Landau– Kunetseka– Overbeek) dzidziso.
Pane yakaderera ionic stamina uye pH yakakosha pamusoro peiyo isoelectric point (~ pH 2), iyo zeta kukwanisa kwebits yakashata zvakakwana kumisa kuunganidza.
Zvisinei, kuwedzera kwe electrolytes, pH kuchinja kune kusarerekera, kana solvent dissipation inogona kutarisa pamusoro penzvimbo mari, kuderedza kusemburwa, uye kukonzeresa kubatana, zvichiita kuti gelation.
Gelation inosanganisira kuumbwa kwetatu-dimensional network kuburikidza ne siloxane (Uye– O– Uye) kuumbwa kwechisungo pakati pezvimedu zviri pedyo, kushandura sol yemvura kuita yakaoma, permeable xerogel pakuoma.
Iyi sol-gel shanduko inodzoserwa mune mamwe masisitimu asi kazhinji inotungamira kune isingadzokerike magadzirirwo ezvimiro., kugadzira hwaro hwekugadzira ceramic uye komputa kugadzirwa.
2. Synthesis Nzira uye Maitiro Kudzora
( Silica Sol)
2.1 Stöber Technique uye Inodzorwa Kukura
Iyo inonyanya kuzivikanwa nzira yekugadzira monodisperse silica sol ndiyo Stöber maitiro, yakagadzirwa mukati 1968, iyo inosanganisira hydrolysis uye condensation yealkoxysilanes– kazhinji tetraethyl orthosilicate (TEOS)– mumudziyo wedoro une aqueous ammonia sechinhu chinokonzera.
Nekunyatso kudzora ma parameter akadai seyemvura-kune-TEOS ratio, ammonia concentration, solvent composition, uye mhinduro tembiricha level, chidimbu saizi inogona kugadziridzwa zvakare kubva ~ 10 nm kusvika 1 µm ine nhete dimension kutenderera.
The system continues via nucleation adhered to by diffusion-limited development, where silanol groups condense to develop siloxane bonds, accumulating the silica framework.
This approach is suitable for applications calling for uniform spherical fragments, such as chromatographic supports, calibration requirements, and photonic crystals.
2.2 Acid-Catalyzed and Biological Synthesis Courses
Alternative synthesis techniques include acid-catalyzed hydrolysis, which favors linear condensation and causes even more polydisperse or aggregated bits, usually made use of in commercial binders and layers.
Acidic conditions (pH 1– 3) promote slower hydrolysis however faster condensation in between protonated silanols, bring about irregular or chain-like structures.
Kuwedzera munguva pfupi yapfuura, bio-inspired and green synthesis strategies have actually emerged, kushandisa silicatein enzymes kana zvirimwa zvakasvinwa kuti uwedzere silica pasi pematambudziko ambient, kuderedza kushandiswa kwesimba uye kupera kwemakemikari.
Aya maitiro anogara ari kuwana mwero wekufarira kune biomedical uye ecological application uko kuchena uye biocompatibility kwakakosha..
Uyezve, indasitiri-giredhi silica sol inowanzogadzirwa uchishandisa ion-exchange maitiro kubva ku sodium silicate mhinduro, yakanamatira ne electrodialysis kubvisa alkali ions uye kudzikamisa colloid.
3. Dzinoshanda Residences uye Interfacial Habits
3.1 Surface Reactivity uye Maitiro ekugadzirisa
Nzvimbo yepamusoro ye silica nanoparticles mu sol inodzorwa nezvikwata zve silanol, iyo inogona kutora chikamu muhydrogen bonding, adsorption, uye covalent kubatanidza ne organosilanes.
Shanduko yenzvimbo yepamusoro ichishandisa kubatanidza vamiriri vakaita se3-aminopropyltriethoxysilane. (ZVINOKWANISA) kana methyltrimethoxysilane inopa zvikwata zvinoshanda (semuenzaniso,– NH TWO,– CH ₃) izvo zvinoshandura hydrophilicity, reactivity, uye kuenderana nematrices chaiwo.
Aya magadzirirwo anobvumira silica sol kushanda seanopindirana mune yakasanganiswa organic-inorganic makomisheni., kuwedzera kupararira mumapolymers uye kusimudzira mechaniki, thermal, kana dzimba dzinovharira.
Unmodified silica sol inoratidza yakasimba hydrophilicity, zvichiita kuti ive yakakwana kune masisitimu emvura, nepo shanduro dzakashandurwa dzinogona kuparadzirwa mune nonpolar zvinonyungudutsa kune dzakakosha layers neingi.
3.2 Rheological uye Optical Characteristics
Silica sol diffusions inowanzoratidza Newtonian kutenderera maitiro pakuderedzwa kwekutarisa, zvisinei, viscosity inokwidziridzwa nekurodha zvidimbu uye inogona kuchinjika kuenda kukucheka-kutetepa pasi pezvakaoma zvakakura zvemukati kana kuunganidzwa kwechidimbu..
Iyi rheological tunability inoshandiswa mukupedzisa, uko kutenderera kwakadzorwa uye kuenzana kwakakosha pakuenderana kuumbwa kwemafirimu.
Optically, silica sol iri pachena mune inooneka spectrum nekuda kweiyo sub-wavelength saizi yezvimedu., izvo zvinoderedza kupararira kwechiedza.
Kuvhurika uku kunoita kuti ishandiswe mumavharo akajeka, anti-reflective mafirimu, uye optical adhesives pasina kukanganisa aesthetic mhando.
Kana yaoma, iyo inoguma silica firimu inochengetedza kuvhurika ichipa kuomarara, abrasion resistance, uye kugadzikana kwekupisa kusvika ~ 600 °C.
4. Industrial uye Advanced Applications
4.1 Coatings, Composites, uye Ceramics
Silica sol inonyatso shandiswa munzvimbo yepamusoro machira emapepa, machira, steels, uye zvinhu zvekuvaka kuvandudza kusamira kwemvura, scratch resistance, uye kutsungirira.
Mukuyera mapepa, inowedzera kudhinda uye mwando chipingamupinyi chekugara; mumafekitari binders, inoshandura maresheni echisikigo ane eco-inoshamwaridzika inorganic dzimwe nzira dzinoora zviri nyore mukati mekukanda.
Semutungamiri wesilica girazi uye ceramics, silica sol inobvumira kudzika-kupisa kugadzirwa kwegobvu, yakakwirira-kuchena zvinhu kuburikidza ne-sol-gel processing, kudzivirira iyo yakanyanya kunyungudika chinhu che quartz.
Inoshandiswawo mukuparadzira mari yekudyara, uko kunogadzira kwakasimba, refractory molds ine yakakura pamusoro penzvimbo kupera.
4.2 Biomedical, Catalytic, uye Energy Applications
Mune biomedicine, silica sol inoshanda senzira yekugovera mishonga masisitimu, biosensors, uye diagnostic imaging, uko pamusoro penzvimbo functionalization inobvumidza yakanangwa inosunga uye yakadzorwa kusunungurwa.
Mesoporous silica nanoparticles (MSNs), yakabva kune templated silica sol, inopa yakakwira kurongedza kugona uye inosimudzira-inopindura kuburitsa michina.
Sekubatsira kwekubatsira, silica sol inopa yakakwirira-yepamusoro-nzvimbo-nzvimbo matrix yekuremadza simbi nanoparticles (e.g., Pt, Au, Pd), kuwedzera kupararira uye hunyanzvi hwekuita mukushanduka kwemakemikari.
Mune simba, silica sol inoshandiswa mumabhatiri kuparadzanisa kuti iwedzere kugadzikana kwekupisa, mune gasi masero membrane layers kuwedzera proton conductivity, uye mune solar panel encapsulants kudzivirira maringe nekunyorova uye kushushikana kwemagetsi.
Mukudzokorora, silica sol inomiririra nheyo nanomaterial iyo inosunga mamorekuru chemistry uye macroscopic performance.
Yayo inodzorwa synthesis, tunable surface area chemistry, uye kuchinjika kubata kunobvumira shanduko yekushandisa muzvikamu zvese, kubva pakugadzirwa kwechigarire kusvika kuhutano hwekurapa hwakaoma uye masimba emagetsi.
Sezvo nanotechnology inofambira mberi, silica sol inoramba ichishanda sedhizaini sisitimu yekugadzira hungwaru, multifunctional colloidal zvigadzirwa.
5. Distributor
Cabr-Concrete mutengesi weConcrete Admixture ine pamusoro 12 makore echiitiko mu nano-kuvaka simba kuchengetedza uye nanotechnology kusimudzira. Inobvuma kubhadhara kuburikidza neCredit Card, T/T, West Union uye Paypal. TRUNNANO ichaendesa zvinhu kune vatengi mhiri kwemakungwa kuburikidza neFedEx, DHL, nemhepo, kana nomugungwa. Kana iwe uchitsvaga yemhando yepamusoro Concrete Admixture, ndapota inzwa wakasununguka kutibata nesu uye kutumira kubvunza.
Tags: silica sol,colloidal silica sol,silicon sol
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