1. Lub hauv paus ntawm Silica Sol Chemistry thiab Colloidal Stability
1.1 Makeup thiab Particle Morphology
(Silica Sol)
Silica sol yog kev ruaj ntseg colloidal diffusion nrog rau amorphous silicon dioxide (SiO ₂) nanoparticles, feem ntau yog los ntawm 5 rau 100 nanometer hauv txoj kab uas hla, muab tso rau hauv ib qho dej theem– feem ntau dej.
Cov nanoparticles no yog tsim los ntawm peb-dimensional network ntawm SiO ₄ tetrahedra, tsim kom muaj qhov ntxeem tau thiab muaj zog heev ntawm thaj chaw uas muaj nyob hauv silanol (Thiab– OH) pab pawg uas tswj cov cwj pwm cuam tshuam.
Lub xeev sol yog thermodynamically metastable, khaws cia los ntawm electrostatic repulsion nyob nruab nrab ntawm cov khoom them; Tus nqi ntawm thaj chaw saum npoo yog tsim los ntawm ionization ntawm silanol pawg, uas deprotonate tshaj pH ~ 2– 3, tsim cov tsis zoo nqi fragments uas tiv thaiv ib leeg.
Particle zoo li ib txwm puag ncig, Txawm hais tias cov teeb meem synthesis tuaj yeem cuam tshuam kev sib sau ua ke thiab kev yuav khoom luv luv.
Qhov siab ntawm thaj tsam-rau-ntim piv– nquag tshaj 100 m OB/g– ua rau silica sol exceptionally teb, ua kom muaj kev sib cuam tshuam zoo nrog cov polymers, hlau, thiab organic molecules.
1.2 Stabilization Devices thiab Gelation Hloov
Colloidal stability nyob rau hauv silica sol feem ntau yog tswj los ntawm qhov sib npaug ntawm van der Waals qhov muag-catching pressures thiab electrostatic repulsion, piav qhia los ntawm DLVO (Derjaguin– Landau– Kev txhawj xeeb– Overbeek) kev xav.
Ntawm qis ionic stamina thiab pH tsim nyog tshaj qhov isoelectric point (~ pH 2), lub peev xwm zeta ntawm cov khoom yog txaus ntshai kom tsis txhob sib sau ua ke.
Txawm li cas los, ntxiv cov electrolytes, pH hloov mus rau qhov nruab nrab, los yog hnyav dissipation tuaj yeem tshuaj xyuas cov nqi ntawm thaj chaw, minimize repulsion, thiab ua rau me ntsis coalescence, ua rau gelation.
Gelation entails tsim ntawm peb-dimensional network los ntawm siloxane (Thiab– O– Thiab) daim ntawv cog lus tsim ntawm cov khoom uas nyob ib sab, hloov cov kua sol rau hauv ib qho tawv, permeable xerogel thaum ziab tawm.
Qhov kev hloov sol-gel no thim rov qab hauv qee lub tshuab tsis tau ib txwm ua rau kev hloov pauv tsis hloov pauv., tsim lub hauv paus rau kev tsim cov khoom siv ceramic thiab cov khoom sib xyaw.
2. Synthesis Paths thiab txheej txheem tswj
( Silica Sol)
2.1 Stöber Technique thiab Tswj Kev Loj Hlob
Txoj kev pom zoo tshaj plaws rau kev tsim monodisperse silica sol yog cov txheej txheem Stöber, tsim nyob rau hauv 1968, uas cuam tshuam nrog hydrolysis thiab condensation ntawm alkoxysilane– feem ntau tetraethyl orthosilicate (TEOS)– nyob rau hauv ib tug cawv lub cuab tam nrog aqueous ammonia raws li ib tug catalyst.
Los ntawm kev tswj hwm qhov tsis xws li dej-rau-TEOS piv, ammonia concentration, kuab tshuaj muaj pes tsawg leeg, thiab teb qhov kub thiab txias, fragment loj tuaj yeem tuned reproducibly los ntawm ~ 10 nm rau 1 µm nrog nqaim dimension ncig.
Lub kaw lus txuas ntxiv ntawm nucleation adhered los ntawm diffusion-limited txoj kev loj hlob, qhov twg silanol pawg condense los tsim siloxane bonds, accumulating silica moj khaum.
Txoj hauv kev no yog tsim rau cov ntawv thov hu rau cov khoom sib thooj kheej kheej, xws li chromatographic kev txhawb nqa, calibration xav tau, thiab photonic crystals.
2.2 Cov chav kawm Acid-Catalyzed thiab Biological Synthesis
Lwm cov txheej txheem synthesis muaj xws li acid-catalyzed hydrolysis, uas haum rau linear condensation thiab ua rau ntau tshaj polydisperse los yog aggregated khoom, feem ntau yog siv rau hauv kev lag luam binders thiab txheej.
Acid tej yam kev mob (pH 1– 3) txhawb kom qeeb hydrolysis tab sis ceev condensation nyob rau hauv nruab nrab ntawm protonated silanols, nqa cov khoom tsis sib xws lossis cov saw hlau zoo li.
Ntxiv lately, bio-inspired thiab ntsuab synthesis tswv yim tau tshwm sim tiag tiag, siv silicatein enzymes los yog cov nroj tsuag rho tawm los precipitate silica nyob rau hauv ambient teeb meem, txo qis kev siv hluav taws xob thiab tshuaj lom neeg pov tseg.
Cov txheej txheem kav ntev no tau txais kev txaus siab rau kev siv biomedical thiab ecological uas purity thiab biocompatibility tseem ceeb.
Tsis tas li ntawd, industrial-qib silica sol feem ntau yog tsim siv cov txheej txheem ion pauv los ntawm sodium silicate daws, adhered los ntawm electrodialysis kom tshem tawm alkali ions thiab stabilize lub colloid.
3. Tswv yim nyob thiab Interfacial Habits
3.1 Nto Reactivity thiab Hloov Kho Cov Txheej Txheem
Qhov chaw saum npoo ntawm silica nanoparticles hauv sol yog tswj los ntawm silanol pab pawg, uas tuaj yeem koom nrog hydrogen bonding, adsorption, thiab covalent grafting nrog organosilanes.
Kev hloov pauv ntawm thaj chaw ua rau siv kev sib txuas cov neeg sawv cev xws li 3-aminopropyltriethoxysilane (SUITABLE) los yog methyltrimethoxysilane nthuav tawm pab pawg ua haujlwm (eg.,– NH OB,– CH ₃) uas hloov hydrophilicity, reactivity, thiab compatibility nrog ntuj matrices.
Cov kev hloov kho no tso cai rau silica sol los ua ib qho kev sib xyaw ua ke hauv cov organic-inorganic compounds crossbreed., boosting diffusion nyob rau hauv polymers thiab txhim kho mechanical, thermal, los yog lub tsev thaiv.
Unmodified silica sol pom muaj zog hydrophilicity, ua kom nws zoo meej rau cov kua dej, thaum hloov pauv hloov tau tuaj yeem tawg mus rau hauv cov kuab tshuaj nonpolar rau cov txheej txheem tshwj xeeb thiab cov inks.
3.2 Rheological thiab Optical yam ntxwv
Silica sol diffusions feem ntau ua rau Newtonian ncig tus cwj pwm ntawm kev txo qis, Txawm li cas los xij viscosity boosts nrog fragment loading thiab tuaj yeem hloov mus rau shear-thinning nyob rau hauv siab cov ntsiab lus los yog ib nrab aggregation.
Qhov no rheological tunability yog exploited nyob rau hauv tiav, qhov twg tswj kev ncig thiab qib yog qhov tseem ceeb rau kev tsim cov yeeb yaj kiab zoo ib yam.
Optically, silica sol yog pob tshab nyob rau hauv lub spectrum pom tau hais tias vim lub sub-wavelength loj ntawm fragments, uas txo lub teeb tawg.
Qhov kev qhib no ua rau nws siv hauv cov ntaub npog meej, anti-reflective films, thiab optical adhesives yam tsis muaj kev puas tsuaj rau qhov zoo nkauj.
Thaum qhuav, qhov tshwm sim silica zaj duab xis khaws cia qhib thaum muab hardness, abrasion tsis kam, thiab thermal stability mus txog ~ 600 ° C.
4. Muaj thiab Advanced Applications
4.1 Txheej, Composites, thiab Ceramics
Silica sol yog siv kom huv si hauv thaj chaw coatings rau ntawv, ntaub, hlau, thiab cov khoom siv hauv tsev los txhim kho dej tsis kam, khawb kuj, thiab resilience.
Hauv daim ntawv sizing, nws boosts printability thiab ya raws teeb meem vaj tse nyob; nyob rau hauv Hoobkas binders, nws hloov tej yam ntuj tso resins nrog eco-phooj ywg inorganic lwm yam uas decompose yooj yim thoob plaws hauv casting.
Raws li ib tug forerunner rau silica iav thiab ceramics, silica sol tso cai rau qis-kub fabrication ntawm tuab, high-purity ntsiab ntawm sol-gel ua, tiv thaiv lub siab melting yam ntawm quartz.
Nws kuj tseem siv tau rau hauv kev nthuav dav nyiaj txiag, qhov twg nws tsim khoom, refractory moulds nrog zoo deg cheeb tsam tiav.
4.2 Biomedical, Catalytic, thiab Kev Siv Hluav Taws Xob
Hauv biomedicine, silica sol ua hauj lwm raws li ib tug system rau kev faib tshuaj, biosensors, thiab diagnostic imaging, qhov chaw saum npoo functionalization tso cai rau lub hom phiaj khi thiab tswj kev tso tawm.
Mesoporous silica nanoparticles (MSNs), muab tau los ntawm templated silica sol, muab lub peev xwm ntim siab thiab stimuli-responsive tso tawm cov cuab yeej.
Raws li kev pabcuam catalyst, silica sol muab lub siab-surface-cheeb tsam matrix rau paralyzing steel nanoparticles (e.g., Pt, Au, Pd), boosting dispersion thiab catalytic efficiency nyob rau hauv tshuaj hloov.
Hauv lub zog, silica sol yog siv los ntawm cov roj teeb cais los txhim kho thermal stability, nyob rau hauv cov roj cell membrane txheej los txhawb proton conductivity, thiab nyob rau hauv lub hnub ci vaj huam sib luag encapsulants los tiv thaiv ntub dej thiab mechanical nro.
Hauv recap, silica sol sawv cev rau lub hauv paus nanomaterial uas txuas cov tshuaj molecular chemistry thiab macroscopic kev ua tau zoo.
Nws tswj synthesis, tunable nto thaj chaw chemistry, thiab hloov tau yooj yim tuav cia kev hloov pauv kev siv thoob plaws hauv cov haujlwm, los ntawm kev tsim khoom ntev mus rau kev kho mob zoo nkauj thiab lub zog siv hluav taws xob.
Raws li nanotechnology vam meej, silica sol tseem ua haujlwm raws li kev tsim qauv tsim kom muaj kev txawj ntse, multifunctional colloidal khoom.
5. Distributor
Cabr-Concrete yog tus xa khoom ntawm Cov Khoom Siv Khoom Siv nrog dhau 12 xyoo dhau los hauv nano-tsim hluav taws xob txuag thiab kev tsim kho nanotechnology. Nws lees txais kev them nyiaj ntawm Credit Card, T/T, West Union thiab Paypal. TRUNNANO yuav xa cov khoom rau cov neeg siv khoom txawv teb chaws los ntawm FedEx, DHL, los ntawm huab cua, los yog hiav txwv. Yog hais tias koj tab tom nrhiav rau siab zoo Concrete Admixture, thov koj xav tiv tauj peb thiab xa cov lus nug.
Cim npe: silica sol,colloidal silica sol,silicon sol
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